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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2411.02148 | Or Zamir | Mark Braverman, Or Zamir | Optimality of Frequency Moment Estimation | null | null | null | null | cs.DS cs.CC cs.IT math.IT | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Estimating the second frequency moment of a stream up to $(1\pm\varepsilon)$
multiplicative error requires at most $O(\log n / \varepsilon^2)$ bits of
space, due to a seminal result of Alon, Matias, and Szegedy. It is also known
that at least $\Omega(\log n + 1/\varepsilon^{2})$ space is needed. We prove an
optimal lower bound of $\Omega\left(\log \left(n \varepsilon^2 \right) /
\varepsilon^2\right)$ for all $\varepsilon = \Omega(1/\sqrt{n})$. Note that
when $\varepsilon>n^{-1/2 + c}$, where $c>0$, our lower bound matches the
classic upper bound of AMS. For smaller values of $\varepsilon$ we also
introduce a revised algorithm that improves the classic AMS bound and matches
our lower bound. Our lower bound holds also for the more general problem of
$p$-th frequency moment estimation for the range of $p\in (1,2]$, giving a
tight bound in the only remaining range to settle the optimal space complexity
of estimating frequency moments.
| [
{
"version": "v1",
"created": "Mon, 4 Nov 2024 15:06:16 GMT"
}
] | 2024-11-05T00:00:00 | [
[
"Braverman",
"Mark",
""
],
[
"Zamir",
"Or",
""
]
] | |
1307.6736 | Kohji Tsumura | Kohji Tsumura, Toshio Matsumoto, Shuji Matsuura, Itsuki Sakon,
Masahiro Tanaka, and Takehiko Wada | Low-Resolution Spectrum of the Diffuse Galactic Light and 3.3 um PAH
emission with AKARI InfraRed Camera | 7 pages, 5 figures, accepted by Publications of the Astronomical
Society of Japan (PASJ) | null | 10.1093/pasj/65.6.120 | null | astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We first obtained the spectrum of the diffuse Galactic light (DGL) at general
interstellar space in 1.8-5.3 um wavelength region with the low-resolution
prism spectroscopy mode of the AKARI Infra-Red Camera (IRC) NIR channel. The
3.3 um PAH band is detected in the DGL spectrum at Galactic latitude |b| < 15
deg, and its correlations with the Galactic dust and gas are confirmed. The
correlation between the 3.3 um PAH band and the thermal emission from the
Galactic dust is expressed not by a simple linear correlation but by a relation
with extinction. Using this correlation, the spectral shape of DGL at optically
thin region (5 deg < |b| < 15 deg) was derived as a template spectrum. Assuming
that the spectral shape of this template spectrum is uniform at any position,
DGL spectrum can be estimated by scaling this template spectrum using the
correlation between the 3.3 um PAH band and the thermal emission from the
Galactic dust.
| [
{
"version": "v1",
"created": "Thu, 25 Jul 2013 13:36:27 GMT"
}
] | 2015-06-16T00:00:00 | [
[
"Tsumura",
"Kohji",
""
],
[
"Matsumoto",
"Toshio",
""
],
[
"Matsuura",
"Shuji",
""
],
[
"Sakon",
"Itsuki",
""
],
[
"Tanaka",
"Masahiro",
""
],
[
"Wada",
"Takehiko",
""
]
] | |
2111.01120 | Yuchi He | Yuchi He, Dante M. Kennes, Volker Meden | Conductance of correlated many-fermion systems from charge fluctuations | 17 pages, 8 figures | PhysRevB.105.165120 (2022) | 10.1103/PhysRevB.105.165120 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We put forward a relation between the static charge fluctuations and the
conductance of correlated many-fermion systems at zero temperature, avoiding
the use of time-dependent fluctuations as in the fluctuation-dissipation
theorem. Static charge fluctuations can efficiently be computed for
low-dimensional systems using tensor network approaches, while the conductance
is often significantly more difficult to obtain, requiring a challenging
low-frequency linear response computation or an explicit time evolution. We put
this relation to the test for quantum dot and quantum point contact setups,
where in limiting cases exact results are known. Our study includes systems in
which the one-dimensional reservoirs are interacting.
| [
{
"version": "v1",
"created": "Mon, 1 Nov 2021 17:54:36 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Apr 2022 18:15:38 GMT"
}
] | 2022-04-18T00:00:00 | [
[
"He",
"Yuchi",
""
],
[
"Kennes",
"Dante M.",
""
],
[
"Meden",
"Volker",
""
]
] | |
0801.2099 | Loriano Bonora | L.Bonora, R.J.Scherer Santos, D.D.Tolla | Spectral properties of ghost Neumann matrices | 29 pages | Phys.Rev.D77:106001,2008 | 10.1103/PhysRevD.77.106001 | SISSA/101/2007/EP | hep-th | null | We continue the analysis of the ghost wedge states in the oscillator
formalism by studying the spectral properties of the ghost matrices of Neumann
coefficients. We show that the traditional spectral representation is not valid
for these matrices and propose a new heuristic formula that allows one to
reconstruct them from the knowledge of their eigenvalues and eigenvectors. It
turns out that additional data, which we call boundary data, are needed in
order to actually implement the reconstruction. In particular our result lends
support to the conjecture that there exists a ghost three strings vertex with
properties parallel to those of the matter three strings vertex.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:44:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bonora",
"L.",
""
],
[
"Santos",
"R. J. Scherer",
""
],
[
"Tolla",
"D. D.",
""
]
] | |
2406.10270 | Temitayo Adefemi | Temitayo Adefemi | A Conceptual Framework For Trie-Augmented Neural Networks (TANNS) | 17 Pages and 9 Figures | null | null | null | cs.CL cs.LG | http://creativecommons.org/licenses/by/4.0/ | Trie-Augmented Neural Networks (TANNs) combine trie structures with neural
networks, forming a hierarchical design that enhances decision-making
transparency and efficiency in machine learning. This paper investigates the
use of TANNs for text and document classification, applying Recurrent Neural
Networks (RNNs) and Feed forward Neural Networks (FNNs). We evaluated TANNs on
the 20 NewsGroup and SMS Spam Collection datasets, comparing their performance
with traditional RNN and FFN Networks with and without dropout regularization.
The results show that TANNs achieve similar or slightly better performance in
text classification. The primary advantage of TANNs is their structured
decision-making process, which improves interpretability. We discuss
implementation challenges and practical limitations. Future work will aim to
refine the TANNs architecture for more complex classification tasks.
| [
{
"version": "v1",
"created": "Tue, 11 Jun 2024 17:08:16 GMT"
}
] | 2024-06-18T00:00:00 | [
[
"Adefemi",
"Temitayo",
""
]
] | |
1603.06139 | Paul Manneville | Paul Manneville | On the dynamics of laminar-turbulent patterns in plane Couette flow | 5 pages, 3 figures, in the Proceedings of the "Rencontre du
Non-Lineaire 2016", Universite Paris-Diderot, 16-17 March, pp. 79-83.
http://nonlineaire.univ-lille1.fr/SNL/comptes-rendus/2016/ | null | null | null | physics.flu-dyn nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Plane Couette flow presents a regular oblique turbulent-laminar pattern over
a wide range of Reynolds numbers R between the globally stable base flow
profile at low R<R_g and a uniformly turbulent regime at sufficiently large
R>R_t. The numerical simulations that we have performed on a pattern displaying
a wavelength modulation show a relaxation of that modulation in agreement with
what one would expect from a standard approach in terms of dissipative
structures in extended geometry though the structuration develops on a
turbulent background. Some consequences are discussed.
| [
{
"version": "v1",
"created": "Sat, 19 Mar 2016 20:22:32 GMT"
}
] | 2016-03-22T00:00:00 | [
[
"Manneville",
"Paul",
""
]
] | |
1312.6175 | Volodymyr Bodenchuk | V. V. Bodenchuk | Lower bounds for Kolmogorov widths of classes of convolutions with
Neumann kernel | 21 pages, in Ukrainian | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain exact lower bounds for Kolmogorov $n$-widths in spaces $C$ and $L$
of classes of convolutions with Neumann kernel
$N_{q,\beta}(t)=\sum\limits_{k=1}^{\infty}\dfrac{q^k}{k}\cos\left(kt-\dfrac{\beta\pi}{2}\right)$,
${q\in(0,1)}$, ${\beta\in\mathbb{R}}$, for all natural $n$ greater some number
which depend only on $q$. The obtained estimates coincide with the best uniform
approximations by trigonometric polynomials of mentioned classes. It made
possible to obtain exact values for widths of these classes.
| [
{
"version": "v1",
"created": "Fri, 20 Dec 2013 23:29:14 GMT"
}
] | 2013-12-24T00:00:00 | [
[
"Bodenchuk",
"V. V.",
""
]
] | |
1303.5916 | Evgeny Mayanskiy | Evgeny Mayanskiy | Poisson cohomology of two Fano threefolds | 24 pages | null | null | null | math.AG math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the variety of Poisson structures and compute Poisson cohomology for
two families of Fano threefolds - smooth cubic threefolds and the del Pezzo
quintic threefold. Along the way we reobtain by a different method earlier
results of Loray, Pereira and Touzet in the special case we are considering.
| [
{
"version": "v1",
"created": "Sun, 24 Mar 2013 05:49:58 GMT"
}
] | 2013-03-26T00:00:00 | [
[
"Mayanskiy",
"Evgeny",
""
]
] | |
1401.0314 | Eugene Bezuglyi | E. V. Bezuglyi, E. N. Bratus' and V. S. Shumeiko | Current-voltage characteristics of asymmetric double-barrier Josephson
junctions | 10 pages, 3 figures | Physica C v.499, 15-23 (2014) | 10.1016/j.physc.2014.02.005 | null | cond-mat.supr-con cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a theory for the current-voltage characteristics of diffusive
superconductor-normal metal-superconductor Josephson junctions with resistive
interfaces and the distance between the electrodes smaller than the
superconducting coherence length. The theory allows for a quantitative
analytical and numerical analysis in the whole range of the interface
transparencies and asymmetry. We focus on the regime of large interface
resistance compared to the resistance of the normal region, when the
electron-hole dephasing in the normal region is significant and the finite
length of the junction plays a role. In the limit of strong asymmetry we find
pronounced current structures at the combination subharmonics of
$\Delta+\Delta_g$, where $\Delta_g$ is the proximity minigap in the normal
region, in addition to the subharmonics of the energy gap $2\Delta$ in the
electrodes. In the limit of rather transparent interfaces, our theory recovers
a known formula for the current in a short mesoscopic connector - a convolution
of the current through a single-channel point contact with the transparency
distribution for an asymmetric double-barrier potential.
| [
{
"version": "v1",
"created": "Wed, 1 Jan 2014 17:57:53 GMT"
}
] | 2015-06-18T00:00:00 | [
[
"Bezuglyi",
"E. V.",
""
],
[
"Bratus'",
"E. N.",
""
],
[
"Shumeiko",
"V. S.",
""
]
] | |
2408.07930 | Wenxuan Xie | Wenxuan Xie, Gaochen Wu, Bowen Zhou | MAG-SQL: Multi-Agent Generative Approach with Soft Schema Linking and
Iterative Sub-SQL Refinement for Text-to-SQL | 22 pages, 14 figures | null | null | null | cs.CL cs.AI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent In-Context Learning based methods have achieved remarkable success in
Text-to-SQL task. However, there is still a large gap between the performance
of these models and human performance on datasets with complex database schema
and difficult questions, such as BIRD. Besides, existing work has neglected to
supervise intermediate steps when solving questions iteratively with question
decomposition methods, and the schema linking methods used in these works are
very rudimentary. To address these issues, we propose MAG-SQL, a multi-agent
generative approach with soft schema linking and iterative Sub-SQL refinement.
In our framework, an entity-based method with tables' summary is used to select
the columns in database, and a novel targets-conditions decomposition method is
introduced to decompose those complex questions. Additionally, we build a
iterative generating module which includes a Sub-SQL Generator and Sub-SQL
Refiner, introducing external oversight for each step of generation. Through a
series of ablation studies, the effectiveness of each agent in our framework
has been demonstrated. When evaluated on the BIRD benchmark with GPT-4, MAG-SQL
achieves an execution accuracy of 61.08%, compared to the baseline accuracy of
46.35% for vanilla GPT-4 and the baseline accuracy of 57.56% for MAC-SQL.
Besides, our approach makes similar progress on Spider. The codes are available
at https://github.com/LancelotXWX/MAG-SQL.
| [
{
"version": "v1",
"created": "Thu, 15 Aug 2024 04:57:55 GMT"
},
{
"version": "v2",
"created": "Fri, 16 Aug 2024 02:55:45 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Oct 2024 04:17:18 GMT"
},
{
"version": "v4",
"created": "Thu, 7 Nov 2024 03:37:51 GMT"
}
] | 2024-11-08T00:00:00 | [
[
"Xie",
"Wenxuan",
""
],
[
"Wu",
"Gaochen",
""
],
[
"Zhou",
"Bowen",
""
]
] | |
1303.3920 | Tobias Jeppsson | Tobias Jeppsson and P\"ar Forslund | Can Life History Predict the Effect of Demographic Stochasticity on
Extinction Risk? | null | The American Naturalist. 2012. 179(6): 706-720 | 10.1086/665696 | null | q-bio.PE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Demographic stochasticity is important in determining extinction risks of
small populations, but it is largely unknown how its effect depends on the life
histories of species. We modeled effects of demographic stochasticity on
extinction risk in a broad range of generalized life histories, using matrix
models and branching processes. Extinction risks of life histories varied
greatly in their sensitivity to demographic stochasticity. Comparing life
histories, extinction risk generally increased with increasing fecundity and
decreased with higher ages of maturation. Effects of adult survival depended on
age of maturation. At lower ages of maturation, extinction risk peaked at
intermediate levels of adult survival, but it increased along with adult
survival at higher ages of maturation. These differences were largely explained
by differences in sensitivities of population growth to perturbations of
life-history traits. Juvenile survival rate contributed most to total
demographic variance in the majority of life histories. Our general results
confirmed earlier findings, suggesting that empirical patterns can be explained
by a relatively simple model. Thus, basic life history information can be used
to assign life-history-specific sensitivity to demographic stochasticity. This
is of great value when assessing the vulnerability of small populations.
| [
{
"version": "v1",
"created": "Fri, 15 Mar 2013 22:45:44 GMT"
}
] | 2013-03-19T00:00:00 | [
[
"Jeppsson",
"Tobias",
""
],
[
"Forslund",
"Pär",
""
]
] | |
1901.10573 | Osamu Kada | Osamu Kada | Characteristic polynomials and zeta functions of equitably partitioned
graphs | 18 pages | Linear Algebra and its Applications, Volume 588, 1 March 2020,
Pages 471-488 | 10.1016/j.laa.2019.11.030 | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $\pi=\{V_1,\dots,V_r\}$ be an equitable partition of the vertex set of a
directed graph (digraph) $X$. It is well known that the characteristic
polynomial $\phi(X/\pi,x)$ of a quotient graph $X/\pi$ divides that of $X$, but
the remainder part is not well investigated. In this paper, we define a
deletion graph $X\backslash\pi$ over an equitable partition $\pi$, which is a
signed directed graph defined for a fixed set of deleting vertices
$\{\bar{v}_i\in V_i, i=1,\cdots,r\}$, and give a similarity transformation
exchanging the adjacency matrix $A(X)$ which is compatible with the equitable
partition for a block triangular matrix whose diagonal blocks are the adjacency
matrix of the quotient graph and the deletion graph. In fact, we show the
result for more general matrices including adjacency matrix of graphs, and as
corollaries, we show the followings: (i) a decomposition formula of the
reciprocal of the Ihara-Bartholdi zeta function over an equitably partitioned
undirected graph into the quotient graph part and the deletion graph part, and
(ii) Chen and Chen's result ([CC17, Theorem 3.1]) on the Ihara-Bartholdi zeta
functions on generalized join graphs, and (iii) Teranishi's result [Ter03,
Theorem 3.3].
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2019 21:53:09 GMT"
},
{
"version": "v2",
"created": "Sat, 21 Dec 2019 23:46:00 GMT"
}
] | 2019-12-24T00:00:00 | [
[
"Kada",
"Osamu",
""
]
] | |
hep-th/9712222 | Paul Zinn-Justin | P. Zinn-Justin | Non-Linear Integral Equations for complex Affine Toda associated to
simply laced Lie algebras | 33 pages, TeX with lanlmac (revised: minor misprints corrected, some
comments added, appendix slightly expanded revised 05/98: more misprints
corrected, important refs added) | J.Phys.A31:6747-6770,1998 | 10.1088/0305-4470/31/31/019 | null | hep-th nlin.SI solv-int | null | A set of coupled non-linear integral equations is derived for a class of
models connected with the quantum group $U_q(\hat g)$ ($g$ simply laced Lie
algebra), which are solvable using the Bethe Ansatz; these equations describe
arbitrary excited states of a system with finite spatial length $L$. They
generalize the Destri-De Vega equation for the Sine-Gordon/massive Thirring
model to affine Toda field theory with imaginary coupling constant. As an
application, the central charge and all the conformal weights of the UV
conformal field theory are extracted in a straightforward manner. The quantum
group truncation for $q$ at a root of unity is discussed in detail; in the UV
limit we recover through this procedure the RCFTs with extended $W(g)$
conformal symmetry.
| [
{
"version": "v1",
"created": "Tue, 23 Dec 1997 22:14:22 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Dec 1997 17:27:50 GMT"
},
{
"version": "v3",
"created": "Fri, 2 Jan 1998 14:40:22 GMT"
},
{
"version": "v4",
"created": "Fri, 9 Jan 1998 10:56:01 GMT"
},
{
"version": "v5",
"created": "Sun, 3 May 1998 16:50:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zinn-Justin",
"P.",
""
]
] | |
2007.00520 | Tyler VanderWeele | Tyler J. VanderWeele | Constructed measures and causal inference: towards a new model of
measurement for psychosocial constructs | null | null | null | null | stat.ME | http://creativecommons.org/licenses/by/4.0/ | Psychosocial constructs can only be assessed indirectly, and measures are
typically formed by a combination of indicators that are thought to relate to
the construct. Reflective and formative measurement models offer different
conceptualizations of the relation between the indicators and what is sometimes
conceived of as a univariate latent variable supposed to correspond in some way
to the construct. It is argued that the empirical implications of reflective
and formative models will often be violated by data since the causally relevant
constituents will generally be multivariate, not univariate. These empirical
implications can be formally tested but factor analysis is not adequate to do
so. It is argued that formative models misconstrue the relationship between the
constructed measures and the underlying reality by which causal processes
operate, but that reflective models misconstrue the nature of the underlying
reality itself by typically presuming that the constituents of it that are
causally efficacious are unidimensional. The ensuing problems arising from
these misconstruals are discussed. A causal interpretation is proposed of
associations between constructed measures and various outcomes that is
applicable to both reflective and formative models and is applicable even if
the usual assumptions of these models are violated. An outline for a new model
of the process of measure construction is put forward. Discussion is given to
the practical implications of these observations and proposals for the
provision of definitions, the selection of items, item-by-item analyses, the
construction of measures, and the interpretation of the associations of these
measures with subsequent outcomes.
| [
{
"version": "v1",
"created": "Wed, 1 Jul 2020 14:34:50 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Feb 2021 01:31:20 GMT"
}
] | 2021-02-24T00:00:00 | [
[
"VanderWeele",
"Tyler J.",
""
]
] | |
cond-mat/9905140 | Kresimir Josic | Kresimir Josic, C. Eugene Wayne (Boston University) | Dynamics of a Ring of Diffusively Coupled Lorenz Oscillators | 30 pages | null | null | null | cond-mat.stat-mech chao-dyn nlin.CD | null | We study the dynamics of a finite chain of diffusively coupled Lorenz
oscillators with periodic boundary conditions. Such rings possess infinitely
many fixed states, some of which are observed to be stable. It is shown that
there exists a stable fixed state in arbitrarily large rings for a fixed
coupling strength. This suggests that coherent behavior in networks of
diffusively coupled systems may appear at a coupling strength that is
independent of the size of the network.
| [
{
"version": "v1",
"created": "Tue, 11 May 1999 15:41:09 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Josic",
"Kresimir",
"",
"Boston University"
],
[
"Wayne",
"C. Eugene",
"",
"Boston University"
]
] | |
astro-ph/0607672 | Valentina D'Odorico | V. D'Odorico, M. Viel, F. Saitta, S. Cristiani, S. Bianchi, B. Boyle,
S. Lopez, J. Maza, P. Outram | Tomography of the intergalactic medium with Ly-alpha forests in close
QSO pairs | Accepted for publication in MNRAS, revised version matching the
accepted one | Mon.Not.Roy.Astron.Soc.372:1333-1344,2006 | 10.1111/j.1365-2966.2006.10941.x | null | astro-ph | null | We study the three-dimensional distribution of non virialised matter at z~2
using high resolution spectra of QSO pairs and simulated spectra drawn from
cosmological hydrodynamical simulations. We have collected the largest sample
of QSO pairs ever observed with UVES at the ESO-VLT, with angular separations
between ~1 and 14 arcmin. The observed correlation functions of the transmitted
flux in the HI Lyman alpha forest along and transverse to the lines of sight
are in good agreement implying that the distortions in redshift space due to
peculiar velocities are small. The clustering signal is significant up to
velocity separations of ~200 km/s, or about 3 h^{-1} comoving Mpc. The regions
at lower overdensity (rho/<rho> < 6.5) are still clustered but on smaller
scales (Delta v < 100 km/s). The observed and simulated correlation functions
are compatible at the 3 sigma level. A better concordance is obtained when only
the low overdensity regions are selected for the analysis or when the effective
optical depth of the simulated spectra is increased artificially, suggesting a
deficiency of strong lines in the simulated spectra. We found that also a lower
value of the power-law index of the temperature-density relation for the Lyman
alpha forest gas improves the agreement between observed and simulated results.
If confirmed, this would be consistent with other observations favouring a late
HeII reionization epoch (at z~3). We remark the detection of a significant
clustering signal in the cross correlation coefficient at a transverse velocity
separation Delta v_{\perp} ~500 km/s whose origin needs further investigation.
| [
{
"version": "v1",
"created": "Mon, 31 Jul 2006 14:00:02 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Sep 2006 09:36:08 GMT"
}
] | 2009-11-11T00:00:00 | [
[
"D'Odorico",
"V.",
""
],
[
"Viel",
"M.",
""
],
[
"Saitta",
"F.",
""
],
[
"Cristiani",
"S.",
""
],
[
"Bianchi",
"S.",
""
],
[
"Boyle",
"B.",
""
],
[
"Lopez",
"S.",
""
],
[
"Maza",
"J.",
""
],
[
"Outram",
"P.",
""
]
] | |
1411.5833 | Olli Mali | Olli Mali | Functional a posteriori error estimate for a nonsymmetric stationary
diffusion problem | 8 pages | null | null | null | math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a posteriori error estimates of functional type for a
stationary diffusion problem with nonsymmetric coefficients are derived. The
estimate is guaranteed and does not depend on any particular numerical method.
An algorithm for the global minimization of the error estimate with respect to
the flux over some finite dimensional subspace is presented. In numerical
tests, global minimization is done over the subspace generated by
Raviart-Thomas elements. The improvement of the error bound due to the
p-refinement of these spaces is investigated.
| [
{
"version": "v1",
"created": "Fri, 21 Nov 2014 11:54:26 GMT"
}
] | 2014-11-24T00:00:00 | [
[
"Mali",
"Olli",
""
]
] | |
2101.09220 | Masaya Fukami | Masaya Fukami, Denis R. Candido, David D. Awschalom, Michael E.
Flatt\'e | Opportunities for long-range magnon-mediated entanglement of spin qubits
via on- and off-resonant coupling | PRX Quantum in press, 10 pages, 5 figures | PRX Quantum 2, 040314 (2021) | 10.1103/PRXQuantum.2.040314 | null | quant-ph cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ability to manipulate entanglement between multiple spatially-separated
qubits is essential for quantum information processing. Although
nitrogen-vacancy (NV) centers in diamond provide a promising qubit platform,
developing scalable two-qubit gates remains a well-known challenge. To this
end, magnon-mediated entanglement proposals have attracted attention due to
their long-range spin-coherent propagation. Optimal device geometries and gate
protocols of such schemes, however, have yet to be determined. Here we predict
strong long-distance ($>\mu$m) NV-NV coupling via magnon modes with
cooperativities exceeding unity in ferromagnetic bar and waveguide structures.
Moreover, we explore and compare on-resonant transduction and off-resonant
virtual-magnon exchange protocols, and discuss their suitability for generating
or manipulating entangled states at low temperatures ($T\lesssim 150$ mK) under
realistic experimental conditions. This work will guide future experiments that
aim to entangle spin qubits in solids with magnon excitations.
| [
{
"version": "v1",
"created": "Fri, 22 Jan 2021 17:09:12 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Sep 2021 21:36:51 GMT"
}
] | 2021-11-03T00:00:00 | [
[
"Fukami",
"Masaya",
""
],
[
"Candido",
"Denis R.",
""
],
[
"Awschalom",
"David D.",
""
],
[
"Flatté",
"Michael E.",
""
]
] | |
0710.3902 | Aneta Iordanova | Aneta Iordanova (for the STAR Collaboration) | Strangeness and bulk freeze-out properties at RHIC | 6 pages, 5 figures, proceedings to Strangeness in Quark Matter 2007 | J.Phys.G35:044008,2008 | 10.1088/0954-3899/35/4/044008 | null | nucl-ex | null | Identified charged kaon, pion, and proton spectra and ratios from sqrt(s_NN)
= 200 and 62.4 GeV Cu+Cu collisions are studied with a hydro-motivated
blast-wave and a statistical model framework in order to explore the
strangeness production at RHIC and characterize the bulk freeze-out properties
of the created system. The spectra are measured at mid-rapidity |y|<0.1 over
the transverse momentum range of 0.25 < p_T < 1.2 GeV/c with particle
identification derived from the ionization energy loss in the STAR Time
Projection Chamber.
The multi-dimensional systematic study of pi(+/-), K(+/-), p and pbar
production in Cu+Cu, Au+Au, d+Au and p+p collisions is used to discuss the
energy, system size and inferred energy density dependence of freeze-out
parameters and strangeness production. The new data from Cu+Cu collisions
bridge the gap between the smaller d+Au and larger Au+Au systems, allowing a
detailed study of the onset of strangeness equilibration at RHIC.
| [
{
"version": "v1",
"created": "Sun, 21 Oct 2007 03:45:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Iordanova",
"Aneta",
"",
"for the STAR Collaboration"
]
] | |
1905.03531 | Carlos-Jes\'us Moreno-\'Avila | Carlos Galindo, Francisco Monserrat and Carlos-Jes\'us Moreno-\'Avila | Seshadri-type constants and Newton-Okounkov bodies for non-positive at
infinity valuations of Hirzebruch surfaces | null | Quaestiones Mathematicae. Volume 46, Issue 11, pages 2367-2401
(2023) | 10.2989/16073606.2022.2146020 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider flags $E_\bullet=\{X\supset E\supset \{q\}\}$, where $E$ is an
exceptional divisor defining a non-positive at infinity divisorial valuation
$\nu_E$ of a Hirzebruch surface $\mathbb{F}_\delta$ and $X$ the surface given
by $\nu_E,$ and determine an analogue of the Seshadri constant for pairs
$(\nu_E,D)$, $D$ being a big divisor on $\mathbb{F}_\delta$. The main result is
an explicit computation of the vertices of the Newton-Okounkov bodies of pairs
$(E_\bullet,D)$ as above, showing that they are quadrilaterals or triangles and
distinguishing one case from another.
| [
{
"version": "v1",
"created": "Thu, 9 May 2019 11:10:36 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Jan 2021 16:52:05 GMT"
}
] | 2024-05-07T00:00:00 | [
[
"Galindo",
"Carlos",
""
],
[
"Monserrat",
"Francisco",
""
],
[
"Moreno-Ávila",
"Carlos-Jesús",
""
]
] | |
1402.1584 | Elena Manjavacas | E. Manjavacas, M. Bonnefoy, J. E. Schlieder, F. Allard, P. Rojo, B.
Goldman, G. Chauvin, D. Homeier, N. Lodieu and T. Henning | New constraints on the formation and settling of dust in the atmospheres
of young M and L dwarfs | Accepted in A&A, February 6, 2014 | null | 10.1051/0004-6361/201323016 | null | astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtained medium-resolution near-infrared spectra of seven young M9.5-L3
dwarfs classified in the optical. We aim to confirm the low surface gravity of
the objects in the NIR. We also test whether atmospheric models correctly
represent the formation and the settling of dust clouds in the atmosphere of
young late-M and L dwarfs. We used ISAAC at VLT to obtain the spectra of the
targets. We compared them to those of mature and young BD, and young late-type
companions to nearby stars with known ages, in order to identify and study
gravity-sensitive features. We computed spectral indices weakly sensitive to
the surface gravity to derive near-infrared spectral types. Finally, we found
the best fit between each spectrum and synthetic spectra from the BT-Settl 2010
and 2013 models. Using the best fit, we derived the atmospheric parameters of
the objects and identify which spectral characteristics the models do not
reproduce. We confirmed that our objects are young BD and we found NIR spectral
types in agreement with the ones determined at optical wavelengths. The
spectrum of the L2-gamma dwarf 2MASSJ2322-6151 reproduces well the spectrum of
the planetary mass companion 1RXS J1609-2105b. BT-Settl models fit the spectra
and the 1-5 $\mu$m SED of the L0-L3 dwarfs for temperatures between 1600-2000
K. But the models fail to reproduce the shape of the H band, and the NIR slope
of some of our targets. This fact, and the best fit solutions found with
super-solar metallicity are indicative of a lack of dust, in particular at high
altitude, in the cloud models. The modeling of the vertical mixing and of the
grain growth will be revised in the next version of the BT-Settl models. These
revisions may suppress the remaining non-reproducibilities.
| [
{
"version": "v1",
"created": "Fri, 7 Feb 2014 10:08:10 GMT"
}
] | 2015-06-18T00:00:00 | [
[
"Manjavacas",
"E.",
""
],
[
"Bonnefoy",
"M.",
""
],
[
"Schlieder",
"J. E.",
""
],
[
"Allard",
"F.",
""
],
[
"Rojo",
"P.",
""
],
[
"Goldman",
"B.",
""
],
[
"Chauvin",
"G.",
""
],
[
"Homeier",
"D.",
""
],
[
"Lodieu",
"N.",
""
],
[
"Henning",
"T.",
""
]
] | |
1706.08532 | Keir Rogers | Keir K. Rogers, Simeon Bird, Hiranya V. Peiris, Andrew Pontzen, Andreu
Font-Ribera, Boris Leistedt | Simulating the effect of high column density absorbers on the
one-dimensional Lyman-alpha forest flux power spectrum | 11 pages, 6 figures. Minor changes to match version published in
MNRAS | MNRAS (2018) 474 (3): 3032-3042 | 10.1093/mnras/stx2942 | null | astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We measure the effect of high column density absorbing systems of neutral
hydrogen (HI) on the one-dimensional (1D) Lyman-alpha forest flux power
spectrum using cosmological hydrodynamical simulations from the Illustris
project. High column density absorbers (which we define to be those with HI
column densities $N(\mathrm{HI}) > 1.6 \times
10^{17}\,\mathrm{atoms}\,\mathrm{cm}^{-2}$) cause broadened absorption lines
with characteristic damping wings. These damping wings bias the 1D Lyman-alpha
forest flux power spectrum by causing absorption in quasar spectra away from
the location of the absorber itself. We investigate the effect of high column
density absorbers on the Lyman-alpha forest using hydrodynamical simulations
for the first time. We provide templates as a function of column density and
redshift, allowing the flexibility to accurately model residual contamination,
i.e., if an analysis selectively clips out the largest damping wings. This
flexibility will improve cosmological parameter estimation, e.g., allowing more
accurate measurement of the shape of the power spectrum, with implications for
cosmological models containing massive neutrinos or a running of the spectral
index. We provide fitting functions to reproduce these results so that they can
be incorporated straightforwardly into a data analysis pipeline.
| [
{
"version": "v1",
"created": "Mon, 26 Jun 2017 18:00:03 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Jan 2018 15:42:51 GMT"
}
] | 2018-01-10T00:00:00 | [
[
"Rogers",
"Keir K.",
""
],
[
"Bird",
"Simeon",
""
],
[
"Peiris",
"Hiranya V.",
""
],
[
"Pontzen",
"Andrew",
""
],
[
"Font-Ribera",
"Andreu",
""
],
[
"Leistedt",
"Boris",
""
]
] | |
1309.6605 | Aaron Hagerstrom | Louis M. Pecora, Francesco Sorrentino, Aaron M. Hagerstrom, Thomas E.
Murphy, Rajarshi Roy | Symmetries, Cluster Synchronization, and Isolated Desynchronization in
Complex Networks | null | null | 10.1038/ncomms5079 | null | nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Synchronization is of central importance in power distribution,
telecommunication, neuronal, and biological networks. Many networks are
observed to produce patterns of synchronized clusters, but it has been
difficult to predict these clusters or understand the conditions under which
they form, except for in the simplest of networks. In this article, we shed
light on the intimate connection between network symmetry and cluster
synchronization. We introduce general techniques that use network symmetries to
reveal the patterns of synchronized clusters and determine the conditions under
which they persist. The connection between symmetry and cluster synchronization
is experimentally explored using an electro-optic network. We experimentally
observe and theoretically predict a surprising phenomenon in which some
clusters lose synchrony while leaving others synchronized. The results could
guide the design of new power grid systems or lead to new understanding of the
dynamical behavior of networks ranging from neural to social.
| [
{
"version": "v1",
"created": "Wed, 25 Sep 2013 18:42:34 GMT"
}
] | 2015-06-17T00:00:00 | [
[
"Pecora",
"Louis M.",
""
],
[
"Sorrentino",
"Francesco",
""
],
[
"Hagerstrom",
"Aaron M.",
""
],
[
"Murphy",
"Thomas E.",
""
],
[
"Roy",
"Rajarshi",
""
]
] | |
1709.08539 | Houssem Chemingui | Asmaa Achtaich (CRI), Nissrine Souissi, Raul Mazo (CRI), Camille
Salinesi (CRI), Ounsa Roudies (CRI) | Designing a Framework for Smart IoT Adaptations | null | International Conference on Emerging Technologies for Developing
Countries, Mar 2017, Marrakech, Morocco | null | null | cs.SE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Internet of Things (IoT) is the science of connecting multiple devices
that coordinate to provide the service in question. IoT environments are
complex, dynamic, rapidly changing and resource constrained. Therefore,
proactively adapting devices to align with context fluctuations becomes a
concern. To propose suitable configurations, it should be possible to sense
information from devices, analyze the data and reconfigure them accordingly.
Applied in the service of the environment, a fleet of devices can monitor
environment indicators and control it in order to propose best fit solutions or
prevent risks like over consumption of resources (e.g., water and energy). This
paper describes our methodology in designing a framework for the monitoring and
multi-instantiation of fleets of connected objects. First by identifying the
particularities of the fleet, then by specifying connected object as a Dynamic
Software Product Line (DSPL), capable of readjusting while running.
| [
{
"version": "v1",
"created": "Mon, 25 Sep 2017 15:09:49 GMT"
}
] | 2017-09-26T00:00:00 | [
[
"Achtaich",
"Asmaa",
"",
"CRI"
],
[
"Souissi",
"Nissrine",
"",
"CRI"
],
[
"Mazo",
"Raul",
"",
"CRI"
],
[
"Salinesi",
"Camille",
"",
"CRI"
],
[
"Roudies",
"Ounsa",
"",
"CRI"
]
] | |
1707.03376 | Wei-Lin Hsiao | Wei-Lin Hsiao, Kristen Grauman | Learning the Latent "Look": Unsupervised Discovery of a Style-Coherent
Embedding from Fashion Images | null | null | null | null | cs.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What defines a visual style? Fashion styles emerge organically from how
people assemble outfits of clothing, making them difficult to pin down with a
computational model. Low-level visual similarity can be too specific to detect
stylistically similar images, while manually crafted style categories can be
too abstract to capture subtle style differences. We propose an unsupervised
approach to learn a style-coherent representation. Our method leverages
probabilistic polylingual topic models based on visual attributes to discover a
set of latent style factors. Given a collection of unlabeled fashion images,
our approach mines for the latent styles, then summarizes outfits by how they
mix those styles. Our approach can organize galleries of outfits by style
without requiring any style labels. Experiments on over 100K images demonstrate
its promise for retrieving, mixing, and summarizing fashion images by their
style.
| [
{
"version": "v1",
"created": "Tue, 11 Jul 2017 17:28:59 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Aug 2017 05:10:52 GMT"
}
] | 2017-08-04T00:00:00 | [
[
"Hsiao",
"Wei-Lin",
""
],
[
"Grauman",
"Kristen",
""
]
] | |
2308.02554 | Khaza Anuarul Hoque | Ernest Bonnah, Luan Viet Nguyen, Khaza Anuarul Hoque | Model Checking Time Window Temporal Logic for Hyperproperties | Accepted for publication in MEMOCODE 2023 | null | 10.1145/3610579.3611077 | null | cs.LO cs.FL cs.RO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Hyperproperties extend trace properties to express properties of sets of
traces, and they are increasingly popular in specifying various security and
performance-related properties in domains such as cyber-physical systems, smart
grids, and automotive. This paper introduces a model checking algorithm for a
new formalism, HyperTWTL, which extends Time Window Temporal Logic (TWTL) -- a
domain-specific formal specification language for robotics, by allowing
explicit and simultaneous quantification over multiple execution traces. We
present HyperTWTL with both \emph{synchronous} and \emph{asynchronous}
semantics, based on the alignment of the timestamps in the traces.
Consequently, we demonstrate the application of HyperTWTL in formalizing
important information-flow security policies and concurrency for robotics
applications. Finally, we propose a model checking algorithm for verifying
fragments of HyperTWTL by reducing the problem to a TWTL model checking
problem.
| [
{
"version": "v1",
"created": "Wed, 2 Aug 2023 05:54:41 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Aug 2023 16:00:20 GMT"
}
] | 2023-08-11T00:00:00 | [
[
"Bonnah",
"Ernest",
""
],
[
"Nguyen",
"Luan Viet",
""
],
[
"Hoque",
"Khaza Anuarul",
""
]
] | |
1212.0906 | Miranda C. N. Cheng | Miranda C. N. Cheng and John F. R. Duncan | On the Discrete Groups of Mathieu Moonshine | 18 pages, published version; AMS Proceeding of the Conference
"Perspectives in Representation Theory", 2013; broken reference links
repaired in this version | null | null | null | math.NT math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that a certain space of cusp forms for the Hecke congruence group of
a given level is one-dimensional if and only if that level is the order of an
element of the second largest Mathieu group. As such, our result furnishes a
direct analogue of Ogg's observation that the normaliser of a Hecke congruence
group of prime level has genus zero if and only if that prime divides the order
of the Fischer-Griess monster group. The significance of the cusp forms under
consideration is explained by the Rademacher sum construction of the
McKay-Thompson series of Mathieu moonshine. Our result supports a conjectural
characterisation of the discrete groups and multiplier systems arising in
Mathieu moonshine.
| [
{
"version": "v1",
"created": "Wed, 5 Dec 2012 00:10:08 GMT"
},
{
"version": "v2",
"created": "Tue, 30 Jul 2013 12:58:30 GMT"
},
{
"version": "v3",
"created": "Sun, 25 Aug 2013 22:45:08 GMT"
}
] | 2013-08-27T00:00:00 | [
[
"Cheng",
"Miranda C. N.",
""
],
[
"Duncan",
"John F. R.",
""
]
] | |
1207.1263 | Ibragim Alikhanov | I. Alikhanov | Neutrino photoproduction on pseudo Nambu-Goldstone bosons | 20 pages, 7 figures. A discussion and calculations of neutrino
emissivities in a hot and dense medium are inserted. Phenomenological
consequences are considered. New figures and references added. Accepted for
publication in Phys. Lett. B | Phys.Lett.B726:670-674,2013 | 10.1016/j.physletb.2013.09.008 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Production of single neutrinos as well as neutrino-antineutrino pairs by
photons interacting with pseudo Nambu-Goldstone bosons is studied within the
Standard Model. The corresponding cross sections are found analytically. The
energy loss due to neutrino emission in a thermal plasma of photons and pions
is calculated. It is shown that the obtained neutrino emissivity may be
significantly enhanced in hot and dense matter due to in-medium modification of
the pion decay constant. Phenomenological consequences for ultrarelativistic
heavy-ion collisions and astrophysics are discussed.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2012 14:10:51 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Dec 2012 19:54:20 GMT"
},
{
"version": "v3",
"created": "Wed, 4 Sep 2013 06:41:34 GMT"
}
] | 2013-10-22T00:00:00 | [
[
"Alikhanov",
"I.",
""
]
] | |
1010.2142 | Peter Eldridge | P. S. Eldridge, J. H\"ubner, S. Oertel, R. T. Harley, M. Henini, and
M. Oestreich | Spin-orbit fields in asymmetric (001) quantum wells | null | Phys. Rev. B 83, 041301(R) (2011) | 10.1103/PhysRevB.83.041301 | null | cond-mat.mes-hall cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We measure simultaneously the in-plane electron g-factor and spin relaxation
rate in a series of undoped inversion-asymmetric (001)-oriented GaAs/AlGaAs
quantum wells by spin-quantum beat spectroscopy. In combination the two
quantities reveal the absolute values of both the Rashba and the Dresselhaus
coefficients and prove that the Rashba coefficient can be negligibly small
despite huge conduction band potential gradients which break the inversion
symmetry. The negligible Rashba coefficient is a consequence of the
'isomorphism' of conduction and valence band potentials in quantum systems
where the asymmetry is solely produced by alloy variations.
| [
{
"version": "v1",
"created": "Mon, 11 Oct 2010 15:54:15 GMT"
}
] | 2011-07-11T00:00:00 | [
[
"Eldridge",
"P. S.",
""
],
[
"Hübner",
"J.",
""
],
[
"Oertel",
"S.",
""
],
[
"Harley",
"R. T.",
""
],
[
"Henini",
"M.",
""
],
[
"Oestreich",
"M.",
""
]
] | |
astro-ph/0505470 | Simon Goodwin | Simon P. Goodwin (Cardiff) & Pavel Kroupa (Bonn) | Limits on the primordial stellar multiplicity | A&A in press, 5 pages (no figures) | Astron.Astrophys.439:565-569,2005 | 10.1051/0004-6361:20052654 | null | astro-ph | null | Most stars - especially young stars - are observed to be in multiple systems.
Dynamical evolution is unable to pair stars efficiently, which leads to the
conclusion that star-forming cores must usually fragment into \geq 2 stars.
However, the dynamical decay of systems with \geq 3 or 4 stars would result in
a large single-star population that is not seen in the young stellar
population. Additionally, ejections would produce a significant population of
hard binaries that are not observed. This leads to a strong constraint on star
formation theories that cores must typically produce only 2 or 3 stars. This
conclusion is in sharp disagreement with the results of currently available
numerical simulations that follow the fragmentation of molecular cores and
typically predict the formation of 5--10 seeds per core. In addition, open
cluster remnants may account for the majority of observed highly hierarchical
higher-order multiple systems in the field.
| [
{
"version": "v1",
"created": "Mon, 23 May 2005 11:25:58 GMT"
}
] | 2011-03-28T00:00:00 | [
[
"Goodwin",
"Simon P.",
"",
"Cardiff"
],
[
"Kroupa",
"Pavel",
"",
"Bonn"
]
] | |
2306.01826 | Yongyu Chen | Yongyu Chen | Approximation schemes for capacity vehicle routing problems: A survey | This work has been submitted to the IEEE for possible publication | 2nd International Conference on Computational Modelling,
Simulation and Optimization (ICCMSO-2023) | 10.1109/ICCMSO59960.2023.00059 | null | cs.DS cs.DM | http://creativecommons.org/licenses/by/4.0/ | Finding the shortest travelling tour of vehicles with capacity k from the
depot to the customers is called the Capacity vehicle routing problem (CVRP).
CVRP plays an essential position in logistics systems, and it is the most
intensively studied problem in combinatorial optimization. In complexity, CVRP
with k $\ge$ 3 is an NP-hard problem, and it is APX-hard as well. We already
knew that it could not be approximated in metric space. Moreover, it is the
first problem resisting Arora's famous approximation framework. So, whether
there is, a polynomial-time (1+$\epsilon$)-approximation for the Euclidean CVRP
for any $\epsilon>0$ is still an open problem. This paper will summarize the
research progress from history to up-to-date developments. The survey will be
updated periodically.
| [
{
"version": "v1",
"created": "Fri, 2 Jun 2023 14:45:33 GMT"
},
{
"version": "v2",
"created": "Tue, 13 Jun 2023 12:55:54 GMT"
},
{
"version": "v3",
"created": "Wed, 12 Jul 2023 00:35:40 GMT"
}
] | 2024-10-28T00:00:00 | [
[
"Chen",
"Yongyu",
""
]
] | |
2102.06237 | Archiki Prasad | Archiki Prasad, Preethi Jyothi, Rajbabu Velmurugan | An Investigation of End-to-End Models for Robust Speech Recognition | Accepted to appear at ICASSP 2021 | null | null | null | eess.AS cs.LG cs.SD | http://creativecommons.org/licenses/by/4.0/ | End-to-end models for robust automatic speech recognition (ASR) have not been
sufficiently well-explored in prior work. With end-to-end models, one could
choose to preprocess the input speech using speech enhancement techniques and
train the model using enhanced speech. Another alternative is to pass the noisy
speech as input and modify the model architecture to adapt to noisy speech. A
systematic comparison of these two approaches for end-to-end robust ASR has not
been attempted before. We address this gap and present a detailed comparison of
speech enhancement-based techniques and three different model-based adaptation
techniques covering data augmentation, multi-task learning, and adversarial
learning for robust ASR. While adversarial learning is the best-performing
technique on certain noise types, it comes at the cost of degrading clean
speech WER. On other relatively stationary noise types, a new speech
enhancement technique outperformed all the model-based adaptation techniques.
This suggests that knowledge of the underlying noise type can meaningfully
inform the choice of adaptation technique.
| [
{
"version": "v1",
"created": "Thu, 11 Feb 2021 19:47:13 GMT"
}
] | 2021-02-15T00:00:00 | [
[
"Prasad",
"Archiki",
""
],
[
"Jyothi",
"Preethi",
""
],
[
"Velmurugan",
"Rajbabu",
""
]
] | |
1801.05448 | Giacomo Venturi | Giacomo Venturi (1,2), Alessandro Marconi (1,2), Matilde Mingozzi
(2,3), Stefano Carniani (4,5), Giovanni Cresci (2), Guido Risaliti (1,2) and
Filippo Mannucci (2) ((1) Dipartimento di Fisica e Astronomia, Universit\`a
degli Studi di Firenze, Sesto Fiorentino, Italy, (2) Osservatorio Astrofisico
di Arcetri (INAF), Firenze, Italy, (3) Dipartimento di Fisica e Astronomia,
Universit\`a di Bologna, Bologna, Italy, (4) Cavendish Laboratory, Department
of Physics, University of Cambridge, Cambridge, United Kingdom, (5) Kavli
Institute for Cosmology, University of Cambridge, Cambridge, United Kingdom) | Ionized Gas Outflows from the MAGNUM Survey: NGC 1365 and NGC 4945 | 9 pages, 2 figures. This proceeding is part of the Research Topic
"Quasars at all cosmic epochs", following the conference in Padova, Italy, on
April 2-7, 2017 | Frontiers in Astronomy and Space Sciences, Vol. 4, id. 46 (2017) | 10.3389/fspas.2017.00046 | null | astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | AGN feedback, acting through strong outflows accelerated in the nuclear
region of AGN hosts, is invoked as a key ingredient for galaxy evolution by
many models to explain the observed BH-galaxy scaling relations. Recently, some
direct observational evidence of radiative mode feedback in action has been
finally found in quasars at $z$>1.5. However, it is not possible to study
outflows in quasars at those redshifts on small scales ($\lesssim$100 pc), as
spatial information is limited by angular resolution. This is instead feasible
in nearby active galaxies, which are ideal laboratories to explore outflow
structure and properties, as well as the effects of AGN on their host galaxies.
In this proceeding we present preliminary results from the MAGNUM survey, which
comprises nearby Seyfert galaxies observed with the integral field spectrograph
VLT/MUSE. We focus on two sources, NGC 1365 and NGC 4945, that exhibit double
conical outflows extending on distances >1 kpc. We disentangle the dominant
contributions to ionization of the various gas components observed in the
central $\sim$5.3 kpc of NGC 1365. An attempt to infer outflow 3D structure in
NGC 4945 is made via simple kinematic modeling, suggesting a hollow cone
geometry.
| [
{
"version": "v1",
"created": "Tue, 16 Jan 2018 19:03:25 GMT"
}
] | 2018-01-18T00:00:00 | [
[
"Venturi",
"Giacomo",
""
],
[
"Marconi",
"Alessandro",
""
],
[
"Mingozzi",
"Matilde",
""
],
[
"Carniani",
"Stefano",
""
],
[
"Cresci",
"Giovanni",
""
],
[
"Risaliti",
"Guido",
""
],
[
"Mannucci",
"Filippo",
""
]
] | |
2410.01948 | Lun Wang | Hongbin Liu, Lun Wang, Om Thakkar, Abhradeep Thakurta, Arun Narayanan | Differentially Private Parameter-Efficient Fine-tuning for Large ASR
Models | null | null | null | null | cs.CR | http://creativecommons.org/licenses/by/4.0/ | Large ASR models can inadvertently leak sensitive information, which can be
mitigated by formal privacy measures like differential privacy (DP). However,
traditional DP training is computationally expensive, and can hurt model
performance. Our study explores DP parameter-efficient fine-tuning as a way to
mitigate privacy risks with smaller computation and performance costs for ASR
models. Through extensive experimentation and progressive optimization, we
achieve 4.6%/8.1% word error rate on LibriSpeech clean/other test-sets, setting
a new performance benchmark while maintaining (10, 3.52e-6)-DP in fine-tuning a
large ASR model with over 600M parameters.
| [
{
"version": "v1",
"created": "Wed, 2 Oct 2024 18:49:15 GMT"
}
] | 2024-10-04T00:00:00 | [
[
"Liu",
"Hongbin",
""
],
[
"Wang",
"Lun",
""
],
[
"Thakkar",
"Om",
""
],
[
"Thakurta",
"Abhradeep",
""
],
[
"Narayanan",
"Arun",
""
]
] | |
1803.01082 | David Goldberg | David A. Goldberg, Debankur Mukherjee, and Yuan Li | Large deviations analysis for the $M/H_2/n + M$ queue in the
Halfin-Whitt regime | null | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the FCFS $M/H_2/n + M$ queue in the Halfin-Whitt heavy traffic
regime. It is known that the normalized sequence of steady-state queue length
distributions is tight and converges weakly to a limiting random variable W.
However, those works only describe W implicitly as the invariant measure of a
complicated diffusion. Although it was proven by Gamarnik and Stolyar that the
tail of W is sub-Gaussian, the actual value of $\lim_{x \rightarrow
\infty}x^{-2}\log(P(W >x))$ was left open. In subsequent work, Dai and He
conjectured an explicit form for this exponent, which was insensitive to the
higher moments of the service distribution.
We explicitly compute the true large deviations exponent for W when the
abandonment rate is less than the minimum service rate, the first such result
for non-Markovian queues with abandonments. Interestingly, our results resolve
the conjecture of Dai and He in the negative. Our main approach is to extend
the stochastic comparison framework of Gamarnik and Goldberg to the setting of
abandonments, requiring several novel and non-trivial contributions. Our
approach sheds light on several novel ways to think about multi-server queues
with abandonments in the Halfin-Whitt regime, which should hold in considerable
generality and provide new tools for analyzing these systems.
| [
{
"version": "v1",
"created": "Sat, 3 Mar 2018 00:34:17 GMT"
}
] | 2018-03-06T00:00:00 | [
[
"Goldberg",
"David A.",
""
],
[
"Mukherjee",
"Debankur",
""
],
[
"Li",
"Yuan",
""
]
] | |
1002.0057 | Ryosho Nakane | Ryosho. Nakane, Tomoyuki Harada, Kuniaki Sugiura, Satoshi Sugahara,
and Masaaki Tanaka | Magnetoresistance of a spin MOSFET with ferromagnetic MnAs source and
drain contacts | 14pages, 4figures | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin-dependent transport was investigated in a spin metal-oxide-semiconductor
field-effect transistors (spin MOSFET) with ferromagnetic MnAs source and drain
(S/D) contacts. The spin MOSFET of bottom-gate type was fabricated by
photolithography using an epitaxial MnAs film grown on a silicon-on-insulator
(SOI) substrate. In-plane magnetoresistance showed spin-valve-type hysteretic
behavior, when the measurements were performed with constant source-drain and
source-gate biases. By comparing with the magnetization-related resistance
change resulting from the MnAs contacts, we conclude that the spin-polarized
electrons are injected from the MnAs source into the Si MOS inversion channel,
and detected by the MnAs drain.
| [
{
"version": "v1",
"created": "Sat, 30 Jan 2010 09:34:16 GMT"
}
] | 2010-02-02T00:00:00 | [
[
"Nakane",
"Ryosho.",
""
],
[
"Harada",
"Tomoyuki",
""
],
[
"Sugiura",
"Kuniaki",
""
],
[
"Sugahara",
"Satoshi",
""
],
[
"Tanaka",
"Masaaki",
""
]
] | |
1809.02977 | Alessandro Casa | Alessandro Casa and Giovanna Menardi | Nonparametric semisupervised classification for signal detection in high
energy physics | null | null | null | null | stat.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Model-independent searches in particle physics aim at completing our
knowledge of the universe by looking for new possible particles not predicted
by the current theories. Such particles, referred to as signal, are expected to
behave as a deviation from the background, representing the known physics.
Information available on the background can be incorporated in the search, in
order to identify potential anomalies. From a statistical perspective, the
problem is recasted to a peculiar classification one where only partial
information is accessible. Therefore a semisupervised approach shall be
adopted, either by strengthening or by relaxing assumptions underlying
clustering or classification methods respectively. In this work, following the
first route, we semisupervise nonparametric clustering in order to identify a
possible signal. The main contribution consists in tuning a nonparametric
estimate of the density underlying the experimental data with the aid of the
available information on the physical theory. As a side contribution, a
variable selection procedure is presented. The whole procedure is tested on a
dataset mimicking proton-proton collisions performed within a particle
accelerator. While finding motivation in the field of particle physics, the
approach is applicable to various science domains, where similar problems of
anomaly detection arise.
| [
{
"version": "v1",
"created": "Sun, 9 Sep 2018 14:10:17 GMT"
},
{
"version": "v2",
"created": "Thu, 30 May 2019 07:07:20 GMT"
}
] | 2019-05-31T00:00:00 | [
[
"Casa",
"Alessandro",
""
],
[
"Menardi",
"Giovanna",
""
]
] | |
1307.2271 | Eduard I. Vorobyov | Eduard I. Vorobyov (1,2), I. Baraffe (3), T. Harries (3), G. Chabrier
(4,3) ((1) Institute of Astrophysics, University of Vienna (2) Research
Institute of Physics, Southern Federal University (3) University of Exeter,
Physics and Astronomy (4) Ecole Normale Superieure, Lyon, CRAL (UMR CNRS
5574), Universite de Lyon, France) | The effect of episodic accretion on the phase transition of CO and CO_2
in low-mass star formation | 12 pages, 6 figures, accepted for publication in Astronomy &
Astrophysics | null | 10.1051/0004-6361/201321775 | null | astro-ph.SR astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evaporation and condensation of CO and CO_2 during the embedded
stages of low-mass star formation by using numerical simulations. We focus on
the effect of luminosity bursts, similar in magnitude to FUors and EXors, on
the gas-phase abundance of CO and CO_2 in the protostellar disk and infalling
envelope. The evolution of a young protostar and its environment is followed
based on hydrodynamical models using the thin-disk approximation, coupled with
a stellar evolution code and phase transformations of CO and CO_2. The
accretion and associated luminosity bursts in our model are caused by disk
gravitational fragmentation followed by quick migration of the fragments onto
the forming protostar. We found that bursts with luminosity on the order of
100-200 L_sun can evaporate CO ices in part of the envelope. The typical
freeze-out time of the gas-phase CO onto dust grains in the envelope (a few
kyr) is much longer than the burst duration (100-200 yr). This results in an
increased abundance of the gas-phase CO in the envelope long after the system
has returned into a quiescent stage. In contrast, luminosity bursts can
evaporate CO_2 ices only in the disk, where the freeze-out time of the
gas-phase CO_2 is comparable to the burst duration. We thus confirm that
luminosity bursts can leave long-lasting traces in the abundance of gas-phase
CO in the infalling envelope, enabling the detection of recent bursts as
suggested by previous semi-analytical studies.
| [
{
"version": "v1",
"created": "Mon, 8 Jul 2013 21:10:33 GMT"
}
] | 2015-06-16T00:00:00 | [
[
"Vorobyov",
"Eduard I.",
""
],
[
"Baraffe",
"I.",
""
],
[
"Harries",
"T.",
""
],
[
"Chabrier",
"G.",
""
]
] | |
2112.05208 | Mark Edwards | S. Thomas, C. Sapp, C. Henry, A. Smith, C.A. Sackett, C.W. Clark, and
M. Edwards | Modeling atom interferometry experiments with Bose-Einstein condensates
in power-law potentials | 22 pages, 3 figures | null | 10.3390/atoms10010034 | null | cond-mat.quant-gas quant-ph | http://creativecommons.org/licenses/by/4.0/ | Recent atom interferometry (AI) experiments involving Bose--Einstein
condensates (BECs) have been conducted under extreme conditions of volume and
interrogation time. Numerical solution of the standard mean-field theory
applied to these experiments presents a nearly intractable challenge. We
present an approximate variational model that provides rapid approximate
solutions of the rotating-frame Gross--Pitaevskii equation for a power-law
potential. This model is well-suited to the design and analysis of AI
experiments involving BECs that are split and later recombined to form an
interference pattern. We derive the equations of motion of the variational
parameters for this model and illustrate how the model can be applied to the
sequence of steps in a recent AI experiment where BECs were used to implement a
dual-Sagnac atom interferometer rotation sensor. We use this model to
investigate the impact of finite-size and interaction effects on the
single-Sagnac-interferometer phase shift.
| [
{
"version": "v1",
"created": "Thu, 9 Dec 2021 20:45:51 GMT"
}
] | 2022-03-25T00:00:00 | [
[
"Thomas",
"S.",
""
],
[
"Sapp",
"C.",
""
],
[
"Henry",
"C.",
""
],
[
"Smith",
"A.",
""
],
[
"Sackett",
"C. A.",
""
],
[
"Clark",
"C. W.",
""
],
[
"Edwards",
"M.",
""
]
] | |
2302.13737 | Ruiyuan Huang | Lingxiao Huang, Ruiyuan Huang, Zengfeng Huang, Xuan Wu | On Coresets for Clustering in Small Dimensional Euclidean Spaces | null | null | null | null | cs.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of constructing small coresets for $k$-Median in
Euclidean spaces. Given a large set of data points $P\subset \mathbb{R}^d$, a
coreset is a much smaller set $S\subset \mathbb{R}^d$, so that the $k$-Median
costs of any $k$ centers w.r.t. $P$ and $S$ are close. Existing literature
mainly focuses on the high-dimension case and there has been great success in
obtaining dimension-independent bounds, whereas the case for small $d$ is
largely unexplored. Considering many applications of Euclidean clustering
algorithms are in small dimensions and the lack of systematic studies in the
current literature, this paper investigates coresets for $k$-Median in small
dimensions. For small $d$, a natural question is whether existing near-optimal
dimension-independent bounds can be significantly improved. We provide
affirmative answers to this question for a range of parameters. Moreover, new
lower bound results are also proved, which are the highest for small $d$. In
particular, we completely settle the coreset size bound for $1$-d $k$-Median
(up to log factors). Interestingly, our results imply a strong separation
between $1$-d $1$-Median and $1$-d $2$-Median. As far as we know, this is the
first such separation between $k=1$ and $k=2$ in any dimension.
| [
{
"version": "v1",
"created": "Mon, 27 Feb 2023 13:03:23 GMT"
}
] | 2023-02-28T00:00:00 | [
[
"Huang",
"Lingxiao",
""
],
[
"Huang",
"Ruiyuan",
""
],
[
"Huang",
"Zengfeng",
""
],
[
"Wu",
"Xuan",
""
]
] | |
0901.4916 | Thomas Gibaud | Christoph Gogelein, Gerhard Nagele, Remco Tuinier, Thomas Gibaud, Anna
Stradner, and Peter Schurtenberger | A simple patchy colloid model for the phase behavior of lysozyme
dispersions | null | The Journal of Chemical Physics 129(8): 085102, 2008 | 10.1063/1.2951987 | null | cond-mat.soft cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a minimal model for spherical proteins with aeolotopic pair
interactions to describe the equilibrium phase behavior of lysozyme. The
repulsive screened Coulomb interactions between the particles are taken into
account assuming that the net charges are smeared out homogeneously over the
spherical protein surfaces. We incorporate attractive surface patches, with the
interactions between patches on different spheres modeled by an attractive
Yukawa potential. The parameters entering the attractive Yukawa potential part
are determined using information on the experimentally accessed gas-liquid-like
critical point. The Helmholtz free energy of the fluid and solid phases is
calculated using second-order thermodynamic perturbation theory. Our
predictions for the solubility curve are in fair agreement with experimental
data. In addition, we present new experimental data for the gas-liquid
coexistence curves at various salt concentrations and compare these with our
model calculations. In agreement with earlier findings, we observe that the
strength and the range of the attractive potential part only weakly depend on
the salt content.
| [
{
"version": "v1",
"created": "Fri, 30 Jan 2009 15:50:11 GMT"
}
] | 2012-03-27T00:00:00 | [
[
"Gogelein",
"Christoph",
""
],
[
"Nagele",
"Gerhard",
""
],
[
"Tuinier",
"Remco",
""
],
[
"Gibaud",
"Thomas",
""
],
[
"Stradner",
"Anna",
""
],
[
"Schurtenberger",
"Peter",
""
]
] | |
cond-mat/0702632 | Andrey Penzev | A. Penzev, Y. Yasuta, M. Kubota | Annealing Effect for Supersolid Fraction in $^4$He | to be published in J. of Low Temp. Phys. (QFS2006 proceedings) | null | 10.1007/s10909-007-9452-4 | null | cond-mat.other | null | We report on experimental confirmation of the non-classical rotational
inertia (NCRI) in solid helium samples originally reported by Kim and Chan. The
onset of NCRI was observed at temperatures below ~400 mK. The ac velocity for
initiation of the NCRI suppression is estimated to be ~10 $\mu$m/sec. After an
additional annealing of the sample at $T= 1.8$ K for 12 hours, ~ 10% relative
increase of NCRI fraction was observed. Then after repeated annealing with the
same conditions, the NCRI fraction was saturated. It differs from Reppy's
observation on a low pressure solid sample.
| [
{
"version": "v1",
"created": "Tue, 27 Feb 2007 11:25:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Penzev",
"A.",
""
],
[
"Yasuta",
"Y.",
""
],
[
"Kubota",
"M.",
""
]
] | |
1507.05229 | V\'ictor Rivero | V\'ictor Manuel Rivero | Entrance laws for positive self-similar Markov processes | Submitted in June 2014, to appear in Proceedings of the First
Congress of the Americas, Contemporary Mathematics (2015) | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose an alternative construction of the self-similar
entrance laws for positive self-similar Markov processes. The study of entrance
laws has been carried out in previous papers using different techniques,
depending on whether the process hits zero in a finite time almost surely or
not. The technique here used allows to obtain the entrance laws in a unified
way. Besides, we show that in the case where the process hits zero in a finite
time, if there exists a self-similar entrance law, then there are infinitely
many, but they can all be embedded into a single one. We propose a pathwise
extension of this embedding for self-similar Markov processes. We apply the
same technique to construct entrance law for other types self-similar
processes.
| [
{
"version": "v1",
"created": "Sat, 18 Jul 2015 22:43:56 GMT"
}
] | 2015-07-21T00:00:00 | [
[
"Rivero",
"Víctor Manuel",
""
]
] | |
1708.02450 | Marco Vanzini | Marco Vanzini, Lucia Reining and Matteo Gatti | Dynamical local connector approximation for electron addition and
removal spectra | 5 pages, 6 figures, 1 supplemental material | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Realistic calculations of electron addition and removal spectra rely most
often on Green's functions and complex, non-local self-energies. We introduce a
shortcut to obtain the spectral function directly from a local and
frequency-dependent, yet real, potential. We calculate this potential in the
homogeneous electron gas (HEG), and we design a connector which prescribes the
use of the HEG results to calculate spectral functions of real materials.
Benchmark results for several solids demonstrate the potential of our approach.
| [
{
"version": "v1",
"created": "Tue, 8 Aug 2017 11:40:13 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Aug 2017 07:19:45 GMT"
}
] | 2017-08-10T00:00:00 | [
[
"Vanzini",
"Marco",
""
],
[
"Reining",
"Lucia",
""
],
[
"Gatti",
"Matteo",
""
]
] | |
cond-mat/9805209 | Frank Zimmerschied | J.-Q. Liang, H.J.W. Mueller-Kirsten, D.K. Park and F. Zimmerschied | Periodic Instantons and Quantum-Classical Transitions in Spin Systems | 10 pages, 3 figures | Phys.Rev.Lett. 81 (1998) 216-219 | 10.1103/PhysRevLett.81.216 | null | cond-mat hep-th | null | Some models allowing explicit calculation of periodic instantons and
evaluation of their action are studied with regard to transitions from
classical to quantum behaviour as the temperature is lowered and tunneling sets
in. It is shown that (beyond a critical value of a coupling) the spin system
considered acquires a first order transition as a result of the field
dependence of its effective mass, whereas models with constant mass exhibit
only second order transitions.
| [
{
"version": "v1",
"created": "Mon, 18 May 1998 13:25:08 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Liang",
"J. -Q.",
""
],
[
"Mueller-Kirsten",
"H. J. W.",
""
],
[
"Park",
"D. K.",
""
],
[
"Zimmerschied",
"F.",
""
]
] | |
1109.6436 | Silvia Masciocchi Dr | S. Masciocchi (for the ALICE Collaboration) | Investigation of charm and beauty production via semileptonic decays of
heavy-flavour hadrons in pp at 7 TeV and Pb--Pb at 2.76 TeV with ALICE | Quark Matter 2011 proceedings | null | 10.1088/0954-3899/38/12/124069 | null | nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electron spectra measured with ALICE at mid-rapidity are used to study the
production of hadrons carrying a charm or a beauty quark. The production cross
section of electrons from heavy-flavour hadron decays is measured in pp
collisions at $\sqrt{s}$=7 TeV. Electrons from the beauty decays are identified
via the displacement from the interaction vertex. From the electron spectra
measured in Pb--Pb collisions, we determine the nuclear modification factor,
which is sensitive to the heavy-quark energy loss in a hot strongly interacting
medium.
| [
{
"version": "v1",
"created": "Thu, 29 Sep 2011 08:36:44 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Masciocchi",
"S.",
"",
"for the ALICE Collaboration"
]
] | |
1810.05378 | Alessandro Paolini | Alessandro Paolini and Iulian I. Simion | On refined Bruhat decompositions and endomorphism algebras of
Gelfand-Graev representations | 20 pages | null | null | null | math.GR math.RA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $G$ be a finite reductive group defined over $\mathbb{F}_q$, with $q$ a
power of a prime $p$. Motivated by a problem recently posed by C. Curtis, we
first develop an algorithm to express each element of $G$ into a canonical form
in terms of a refinement of a Bruhat decomposition, and we then use the output
of the algorithm to explicitly determine the structure constants of the
endomorphism algebra of a Gelfand-Graev representation of $G$ when
$G=\mathrm{PGL}_3(q)$ for an arbitrary prime $p$, and when $G=\mathrm{SO}_5(q)$
for $p$ odd.
| [
{
"version": "v1",
"created": "Fri, 12 Oct 2018 06:57:41 GMT"
}
] | 2018-10-15T00:00:00 | [
[
"Paolini",
"Alessandro",
""
],
[
"Simion",
"Iulian I.",
""
]
] | |
2306.17404 | Chien-Yi Wang | Hsi-Che Lin, Chien-Yi Wang, Min-Hung Chen, Szu-Wei Fu, Yu-Chiang Frank
Wang | QuAVF: Quality-aware Audio-Visual Fusion for Ego4D Talking to Me
Challenge | 1st place at Ego4D Talking to Me (TTM) Challenge 2023 | null | null | null | cs.CV | http://creativecommons.org/licenses/by/4.0/ | This technical report describes our QuAVF@NTU-NVIDIA submission to the Ego4D
Talking to Me (TTM) Challenge 2023. Based on the observation from the TTM task
and the provided dataset, we propose to use two separate models to process the
input videos and audio. By doing so, we can utilize all the labeled training
data, including those without bounding box labels. Furthermore, we leverage the
face quality score from a facial landmark prediction model for filtering noisy
face input data. The face quality score is also employed in our proposed
quality-aware fusion for integrating the results from two branches. With the
simple architecture design, our model achieves 67.4% mean average precision
(mAP) on the test set, which ranks first on the leaderboard and outperforms the
baseline method by a large margin. Code is available at:
https://github.com/hsi-che-lin/Ego4D-QuAVF-TTM-CVPR23
| [
{
"version": "v1",
"created": "Fri, 30 Jun 2023 05:14:45 GMT"
}
] | 2023-07-03T00:00:00 | [
[
"Lin",
"Hsi-Che",
""
],
[
"Wang",
"Chien-Yi",
""
],
[
"Chen",
"Min-Hung",
""
],
[
"Fu",
"Szu-Wei",
""
],
[
"Wang",
"Yu-Chiang Frank",
""
]
] | |
2009.02581 | Dan Reznik | Dan Reznik and Ronaldo Garcia and Hellmuth Stachel | Area-Invariant Pedal-Like Curves Derived from the Ellipse | 15 pages, 11 figures, 1 table | null | null | null | math.MG cs.GR cs.RO math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study six pedal-like curves associated with the ellipse which are
area-invariant for pedal points lying on one of two shapes: (i) a circle
concentric with the ellipse, or (ii) the ellipse boundary itself. Case (i) is a
corollary to properties of the Curvature Centroid (Kr\"ummungs-Schwerpunkt) of
a curve, proved by Steiner in 1825. For case (ii) we prove area invariance
algebraically. Explicit expressions for all invariant areas are also provided.
| [
{
"version": "v1",
"created": "Sat, 5 Sep 2020 18:33:59 GMT"
},
{
"version": "v2",
"created": "Sat, 12 Sep 2020 15:55:14 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Sep 2020 21:13:47 GMT"
}
] | 2020-09-18T00:00:00 | [
[
"Reznik",
"Dan",
""
],
[
"Garcia",
"Ronaldo",
""
],
[
"Stachel",
"Hellmuth",
""
]
] | |
2502.01773 | Xupeng Zhu | Xupeng Zhu, David Klee, Dian Wang, Boce Hu, Haojie Huang, Arsh Tangri,
Robin Walters, Robert Platt | Coarse-to-Fine 3D Keyframe Transporter | null | null | null | null | cs.RO cs.CV | http://creativecommons.org/licenses/by/4.0/ | Recent advances in Keyframe Imitation Learning (IL) have enabled
learning-based agents to solve a diverse range of manipulation tasks. However,
most approaches ignore the rich symmetries in the problem setting and, as a
consequence, are sample-inefficient. This work identifies and utilizes the
bi-equivariant symmetry within Keyframe IL to design a policy that generalizes
to transformations of both the workspace and the objects grasped by the
gripper. We make two main contributions: First, we analyze the bi-equivariance
properties of the keyframe action scheme and propose a Keyframe Transporter
derived from the Transporter Networks, which evaluates actions using
cross-correlation between the features of the grasped object and the features
of the scene. Second, we propose a computationally efficient coarse-to-fine
SE(3) action evaluation scheme for reasoning the intertwined translation and
rotation action. The resulting method outperforms strong Keyframe IL baselines
by an average of >10% on a wide range of simulation tasks, and by an average of
55% in 4 physical experiments.
| [
{
"version": "v1",
"created": "Mon, 3 Feb 2025 19:26:30 GMT"
}
] | 2025-02-05T00:00:00 | [
[
"Zhu",
"Xupeng",
""
],
[
"Klee",
"David",
""
],
[
"Wang",
"Dian",
""
],
[
"Hu",
"Boce",
""
],
[
"Huang",
"Haojie",
""
],
[
"Tangri",
"Arsh",
""
],
[
"Walters",
"Robin",
""
],
[
"Platt",
"Robert",
""
]
] | |
0712.0037 | Hui Hu | Hui Hu, Xia-Ji Liu, and Peter D. Drummond | Comparative study of strong coupling theories of a trapped Fermi gas at
unitarity | 4 pages and 3 figures; Published version in PRA as Rapid
Communications | Phys. Rev. A 77, 061605(R) (2008) | 10.1103/PhysRevA.77.061605 | null | cond-mat.stat-mech cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic comparison of the most recent thermodynamic
measurements of a trapped Fermi gas at unitarity with predictions from strong
coupling theories and quantum Monte Carlo (MC) simulations. The accuracy of the
experimental data, of the order of a few percent, allows a precise test of
different many-body approaches. We find that a Nozieres and Schmitt-Rink
treatment of fluctuations is in excellent agreement with the experimental data
and available MC calculations at unitarity.
| [
{
"version": "v1",
"created": "Sat, 1 Dec 2007 01:49:28 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jul 2008 01:44:59 GMT"
}
] | 2008-07-09T00:00:00 | [
[
"Hu",
"Hui",
""
],
[
"Liu",
"Xia-Ji",
""
],
[
"Drummond",
"Peter D.",
""
]
] | |
1102.2700 | Antonia Wachter | Antonia Wachter, Vladimir Sidorenko, Martin Bossert, Victor Zyablov | On (Partial) Unit Memory Codes Based on Gabidulin Codes | null | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | (Partial) Unit Memory ((P)UM) codes provide a powerful possibility to
construct convolutional codes based on block codes in order to achieve a high
decoding performance. In this contribution, a construction based on Gabidulin
codes is considered. This construction requires a modified rank metric, the
so-called sum rank metric. For the sum rank metric, the free rank distance, the
extended row rank distance and its slope are defined analogous to the extended
row distance in Hamming metric. Upper bounds for the free rank distance and the
slope of (P)UM codes in the sum rank metric are derived and an explicit
construction of (P)UM codes based on Gabidulin codes is given, achieving the
upper bound for the free rank distance.
| [
{
"version": "v1",
"created": "Mon, 14 Feb 2011 08:53:34 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Feb 2011 12:29:32 GMT"
}
] | 2011-02-16T00:00:00 | [
[
"Wachter",
"Antonia",
""
],
[
"Sidorenko",
"Vladimir",
""
],
[
"Bossert",
"Martin",
""
],
[
"Zyablov",
"Victor",
""
]
] | |
2402.10048 | Maurice Chiodo | Maurice Chiodo, Dennis M\"uller | A Field Guide to Ethics in Mathematics | 10 pages, 1 figure. This article is a preliminary version of an
article that will be published in the Notices of the AMS. It is currently
under review | Notices of the American Mathematical Society, 71(7), 939-947.
August 2024 | 10.1090/noti2975 | null | math.HO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Mathematics has become inescapable in modern, digitized societies: there is
hardly any area of life left that isn't affected by it, and we as
mathematicians play a central role in this. Our actions affect what others, in
particular our students, decide to do with mathematics, and how mathematics
affects the world, for better or worse. In return, the study of ethics in
mathematics (EiM) has become increasingly important, even though it is still
unknown to many. This exposition tries to change that, by motivating ethics in
mathematics as an interesting, tractable, non-trivial, well-defined and good
research area for mathematicians to consider.
| [
{
"version": "v1",
"created": "Thu, 15 Feb 2024 16:10:43 GMT"
}
] | 2024-07-18T00:00:00 | [
[
"Chiodo",
"Maurice",
""
],
[
"Müller",
"Dennis",
""
]
] | |
nucl-ex/0701034 | Ilya Selyuzhenkov Dr. | I. Selyuzhenkov (for the STAR Collaboration) | Centrality dependence of hyperon global polarization in Au+Au collisions
at RHIC | Talk given at QM 2006, The 19th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions, November 14-20, 2006,
Shanghai, China; 4 pages, 2 figures | J.Phys.G34:S1099-1102,2007 | 10.1088/0954-3899/34/8/S164 | null | nucl-ex | null | We present the centrality dependence of Lambda and Anti-Lambda hyperon global
polarization in Au+Au collisions at sqrt{s_NN}=62 GeV and 200 GeV measured with
the STAR detector at RHIC. Within the precision of the measurement, we observe
no centrality dependence of Lambda and Anti-Lambda hyperon global polarization
and within our acceptance it is consistent with zero. Different sources of
systematic uncertainties (feed down effects, spin precession) are discussed and
estimated. The obtained upper limit, |P_{Lambda,Anti-Lambda}| < 0.02, is
compared to theoretical predictions discussed recently in literatures.
| [
{
"version": "v1",
"created": "Mon, 22 Jan 2007 18:11:49 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"Selyuzhenkov",
"I.",
"",
"for the STAR Collaboration"
]
] | |
2411.09415 | Kevin MacDonald | Thomas A. Grant, Anton N. Vetlugin, Eric Plum, Kevin F. MacDonald, and
Nikolay I. Zheludev | Localization of nanoscale objects with light singularities | 7 pages, 4 figures | null | null | null | physics.optics | http://creativecommons.org/licenses/by/4.0/ | Unprecedented atomic-scale measurement resolution has recently been
demonstrated in single-shot optical localization metrology based on
deep-learning analyses of diffraction patterns of topologically structured
light scattered from objects. Here we show that variations in the diffraction
patterns caused by positional changes of an object depend upon the spatial
derivatives of the magnitude and phase of the incident field, with the latter
strongly enhanced at phase singularities. Despite lower intensity near the
singularity, an orders-of-magnitude increase in Fisher information contained in
the diffraction patterns can be achieved when a nano-object is illuminated by
light containing phase singularities, rather than a plane wave. Our work
provides a fundamental explanation and motivation for singularity-based
metrology with deeply subwavelength precision.
| [
{
"version": "v1",
"created": "Thu, 14 Nov 2024 13:09:41 GMT"
}
] | 2024-11-15T00:00:00 | [
[
"Grant",
"Thomas A.",
""
],
[
"Vetlugin",
"Anton N.",
""
],
[
"Plum",
"Eric",
""
],
[
"MacDonald",
"Kevin F.",
""
],
[
"Zheludev",
"Nikolay I.",
""
]
] | |
1910.00466 | Behnam Pourhassan | Ujjal Debnath, Behnam Pourhassan, Izzet Sakalli | Modified Cosmic Chaplygin AdS Black Hole | 30 pages, 13 figures | Mod.Phys.Lett.A 37 (2022) 14, 2250085 | 10.1142/S0217732322500857 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we construct a new charged AdS black hole with modified cosmic
Chaplygin gas (MCCG). In comparison to the previous model (modified Chaplygin
AdS black hole) existed in the literature, we now have two new parameters: the
cosmic parameter and the black hole's electric charge. We examine the
asymptotically charged AdS black hole thermodynamics with MCCG under the
assumption of a negative cosmological constant as a thermodynamics pressure.
Using MCCG, we developed a new solution to Einstein's AdS black hole field
equations.The mass parameter, volume, electric potential, entropy, and
temperature of the charged AdS black hole have all been computed. We also study
the various energy conditions for the MCCG as a source fluid of AdS black hole.
For some restrictions on the involved parameters, we show that these conditions
are met. Then, we study the thermodynamical stability, critical points, and
Joule-Thompson expansion for the back hole obtained. We reveal that while the
existence of cosmic parameter yields to a complete stable mode, its absence
gives rise to some unstable regions. Then, using MCCG, we treat the obtained
black hole's thermodynamics as a heat engine and calculate the work done as
well as the heat engine's maximum efficiency in the Carnot cycle. The work
done, the efficiency, and the Rankine cycle's efficiency are also investigated.
All of the findings are graphically depicted and discussed.
| [
{
"version": "v1",
"created": "Wed, 25 Sep 2019 18:35:22 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Apr 2022 17:06:10 GMT"
}
] | 2022-06-17T00:00:00 | [
[
"Debnath",
"Ujjal",
""
],
[
"Pourhassan",
"Behnam",
""
],
[
"Sakalli",
"Izzet",
""
]
] | |
1104.0731 | Benjamin Antieau | Benjamin Antieau | On a theorem of Hazrat and Hoobler | submitted | null | null | null | math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use cycle complexes with coefficients in an Azumaya algebra, as developed
by Kahn and Levine, to compare the G-theory of an Azumaya algebra to the
G-theory of the base scheme. We obtain a sharper version of a theorem of Hazrat
and Hoobler in certain cases.
| [
{
"version": "v1",
"created": "Tue, 5 Apr 2011 04:30:34 GMT"
}
] | 2011-04-06T00:00:00 | [
[
"Antieau",
"Benjamin",
""
]
] | |
cond-mat/0107340 | Pavol Kalinay | P. Kalinay, L. Samaj | Thermodynamic Properties of the Two-Dimensional Coulomb Gas in the
Low-Density Limit | 18 pages, 3 figures | J. Stat. Phys. 106 (2002) 857-874 | null | null | cond-mat.stat-mech | null | The model under consideration is the two-dimensional Coulomb gas of $\pm$
charged hard disks with diameter $\sigma$. For the case of pointlike charges
$(\sigma=0)$, the system is stable against collapse of positive-negative pairs
of charges in the range of inverse temperatures $0 \le \beta < 2$, where its
full thermodynamics was obtained exactly [L. {\v{S}}amaj and I. Trav{\v{e}}nec,
{\it J. Stat. Phys.} {\bf 101}:713 (2000)]. In the present work, we derive the
leading correction to the exact thermodynamics of pointlike charges due to the
presence of the hard core $\sigma$ (appearing in the dimensionless combination
$n\sigma^2$, $n$ is the particle density). This permits us to extend the
treatment to the interval $2\le \beta <3$ (the Kosterlitz-Thouless phase
transition takes place at $\beta=4$). The results, which are exact in the
low-density limit $n\sigma^2 \to 0$, reproduce correctly the singularities of
thermodynamic quantities at the collapse point $\beta=2$ and agree very well
with Monte-Carlo simulations.
| [
{
"version": "v1",
"created": "Mon, 16 Jul 2001 12:54:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kalinay",
"P.",
""
],
[
"Samaj",
"L.",
""
]
] | |
1311.6221 | J\"urgen M\"unch | J\"urgen M\"unch, Fabian Fagerholm, Petri Kettunen, Max Pagels, Jari
Partanen | The Effects of GQM+Strategies on Organizational Alignment | 15 pages. Proceedings of the DASMA Software Metric Congress (MetriKon
2013): Magdeburger Schriften zum Empirischen Software Engineering, 2013 | null | null | null | cs.SE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The increasing role of software for developing products and services requires
that organizations align their software-related activities with high-level
business goals. In practice, this alignment is very difficult and only little
systematic support is available. GQM+Strategies is a method that aims at
aligning organizational goals, strategies, and measurements at all levels of an
organization in a seamless way. This article describes a case study of applying
GQM+Strategies in a globally op- erating industrial R&D organization developing
special-purpose device products for B2B customers. The study analyzes how
GQM+Strategies has helped clarify and harmonize the goal set of the
organization. Results of the study indicate improved alignment and integration
of different goals. In addition, the method helped to make the initially
informal goal-setting more transparent and consequently enabled revising it
while new, more important goals were discovered and comprehended. Moreover,
several elements affecting the achievement of goals as well as impediments were
identified.
| [
{
"version": "v1",
"created": "Mon, 25 Nov 2013 07:42:08 GMT"
}
] | 2013-11-26T00:00:00 | [
[
"Münch",
"Jürgen",
""
],
[
"Fagerholm",
"Fabian",
""
],
[
"Kettunen",
"Petri",
""
],
[
"Pagels",
"Max",
""
],
[
"Partanen",
"Jari",
""
]
] | |
2203.16776 | Huahuan Zheng | Huahuan Zheng, Keyu An, Zhijian Ou, Chen Huang, Ke Ding, Guanglu Wan | An Empirical Study of Language Model Integration for Transducer based
Speech Recognition | Accepted into INTERSPEECH 2022 | null | null | null | eess.AS cs.CL cs.LG | http://creativecommons.org/licenses/by/4.0/ | Utilizing text-only data with an external language model (ELM) in end-to-end
RNN-Transducer (RNN-T) for speech recognition is challenging. Recently, a class
of methods such as density ratio (DR) and internal language model estimation
(ILME) have been developed, outperforming the classic shallow fusion (SF)
method. The basic idea behind these methods is that RNN-T posterior should
first subtract the implicitly learned internal language model (ILM) prior, in
order to integrate the ELM. While recent studies suggest that RNN-T only learns
some low-order language model information, the DR method uses a well-trained
neural language model with full context, which may be inappropriate for the
estimation of ILM and deteriorate the integration performance. Based on the DR
method, we propose a low-order density ratio method (LODR) by replacing the
estimation with a low-order weak language model. Extensive empirical
experiments are conducted on both in-domain and cross-domain scenarios on
English LibriSpeech & Tedlium-2 and Chinese WenetSpeech & AISHELL-1 datasets.
It is shown that LODR consistently outperforms SF in all tasks, while
performing generally close to ILME and better than DR in most tests.
| [
{
"version": "v1",
"created": "Thu, 31 Mar 2022 03:33:50 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Apr 2022 03:00:37 GMT"
},
{
"version": "v3",
"created": "Tue, 5 Jul 2022 05:43:07 GMT"
},
{
"version": "v4",
"created": "Wed, 3 Aug 2022 08:10:30 GMT"
}
] | 2022-08-04T00:00:00 | [
[
"Zheng",
"Huahuan",
""
],
[
"An",
"Keyu",
""
],
[
"Ou",
"Zhijian",
""
],
[
"Huang",
"Chen",
""
],
[
"Ding",
"Ke",
""
],
[
"Wan",
"Guanglu",
""
]
] | |
cond-mat/9809139 | Michael Potthoff | M. Potthoff, T. Herrmann and W. Nolting | Optimization of alloy-analogy-based approaches to the
infinite-dimensional Hubbard model | LaTeX, 18 pages, 12 eps figures included | Eur. Phys. J. B 4, 485 (1998) | 10.1007/s100510050406 | null | cond-mat.str-el | null | An analytical expression for the self-energy of the infinite-dimensional
Hubbard model is proposed that interpolates between different exactly solvable
limits. We profit by the combination of two recent approaches that are based on
the alloy-analogy (Hubbard-III) solution: The modified alloy-analogy (MAA)
which focuses on the strong-coupling regime, and the Edwards-Hertz approach
(EHA) which correctly recovers the weak-coupling regime. Investigating the
high-energy expansion of the EHA self-energy, it turns out that the EHA
reproduces the first three exactly known moments of the spectral density only.
This may be insufficient for the investigation of spontaneous magnetism. The
analysis of the high-energy behavior of the CPA self-consistency equation
allows for a new interpretation of the MAA: The MAA is the only (two-component)
alloy-analogy that correctly takes into account the first four moments of the
spectral density. For small U, however, the MAA does not reproduce Fermi-liquid
properties. The defects of the MAA as well as of the EHA are avoided in the new
approach. We discuss the prospects of the theory and present numerical results
in comparison with essentially exact quantum Monte Carlo data. The correct
high-energy behavior of the self-energy is proved to be a decisive ingredient
for a reliable description of spontaneous magnetism.
| [
{
"version": "v1",
"created": "Wed, 9 Sep 1998 08:57:18 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Potthoff",
"M.",
""
],
[
"Herrmann",
"T.",
""
],
[
"Nolting",
"W.",
""
]
] | |
astro-ph/0312347 | Maxim Lyutikov | Maxim Lyutikov (1), Roger Blandford (2), ((1) McGill University, (2)
Kavli Institute for Particle Astrophysics and Cosmology) | Gamma Ray Bursts as Electromagnetic Outflows | 78 pages, 11 figures | null | null | null | astro-ph | null | (Abridged) We interpret gamma ray bursts as relativistic, electromagnetic
explosions. Specifically, we propose that they are created when a rotating,
relativistic, stellar-mass progenitor loses much of its rotational energy in
the form of a Poynting flux during an active period lasting $\sim 100$ s.
Initially, a non-spherically symmetric, electromagnetically-dominated bubble
expands non-relativistically inside the star, most rapidly along the rotational
axis of the progenitor. After the bubble breaks out from the stellar surface
and most of the electron-positron pairs annihilate, the bubble expansion
becomes highly relativistic. After the end of the source activity most of the
electromagnetic energy is concentrated in a thin shell inside the contact
discontinuity between the ejecta and the shocked circumstellar material. This
electromagnetic shell pushes a relativistic blast wave into the circumstellar
medium. Current-driven instabilities develop in this shell at a radius
$\sim3\times10^{16}$ cm and lead to dissipation of magnetic field and
acceleration of pairs which are responsible for the $\gamma$-ray burst. At
larger radii, the energy contained in the electromagnetic shell is mostly
transferred to the preceding blast wave. Particles accelerated at the forward
shock may combine with electromagnetic field from the electromagnetic shell to
produce the afterglow emission.
| [
{
"version": "v1",
"created": "Fri, 12 Dec 2003 21:06:37 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lyutikov",
"Maxim",
""
],
[
"Blandford",
"Roger",
""
]
] | |
1409.4942 | Werner Herr F | W. Herr, X. Buffat, R. Calaga, R. Giachino, G. Papotti, T. Pieloni, D.
Kaltchev | Long Range Beam-beam Effects in the LHC | Presented at the ICFA Mini-Workshop on Beam-Beam in Hadron Colliders,
CERN, Geneva, Switzerland, 18-22 March 2013 | CERN-2014-004, pp. 87-92 | 10.5170/CERN-2014-004.87 | null | physics.acc-ph | http://creativecommons.org/licenses/by/3.0/ | We report on the experience with long-range beam--beam effects in the LHC, in
dedicated studies as well as the experience from operation. Where possible, we
compare the observations with the expectations.
| [
{
"version": "v1",
"created": "Wed, 17 Sep 2014 10:54:08 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Oct 2014 01:49:12 GMT"
}
] | 2014-10-10T00:00:00 | [
[
"Herr",
"W.",
""
],
[
"Buffat",
"X.",
""
],
[
"Calaga",
"R.",
""
],
[
"Giachino",
"R.",
""
],
[
"Papotti",
"G.",
""
],
[
"Pieloni",
"T.",
""
],
[
"Kaltchev",
"D.",
""
]
] | |
gr-qc/0003058 | S. Shankarnarayanan | S.Shankaranarayanan and T. Padmanabhan (IUCAA) | Hypothesis of path integral duality: Applications to QED | 15 pages, LaTeX2e (uses ijmpd.sty); To appear in IJMP-D; References
added | Int.J.Mod.Phys.D10:351-366,2001 | 10.1142/S0218271801000901 | IUCAA-12/2000 | gr-qc hep-th | null | We use the modified propagator for quantum field based on a ``principle of
path integral duality" proposed earlier in a paper by Padmanabhan to
investigate several results in QED. This procedure modifies the Feynman
propagator by the introduction of a fundamental length scale. We use this
modified propagator for the Dirac particles to evaluate the first order
radiative corrections in QED. We find that the extra factor of the modified
propagator acts like a regulator at the Planck scales thereby removing the
divergences that otherwise appear in the conventional radiative correction
calculations of QED. We find that:(i) all the three renormalisation factors
$Z_1$, $Z_2$, and $Z_3$ pick up finite corrections and (ii) the modified
propagator breaks the gauge invariance at a very small level of
${\mathcal{O}}(10^{-45})$. The implications of this result to generation of the
primordial seed magnetic fields are discussed.
| [
{
"version": "v1",
"created": "Wed, 15 Mar 2000 08:53:00 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Jan 2001 05:26:34 GMT"
}
] | 2011-09-01T00:00:00 | [
[
"Shankaranarayanan",
"S.",
"",
"IUCAA"
],
[
"Padmanabhan",
"T.",
"",
"IUCAA"
]
] | |
2402.07877 | Yangxinyu Xie | Yangxinyu Xie, Bowen Jiang, Tanwi Mallick, Joshua David Bergerson,
John K. Hutchison, Duane R. Verner, Jordan Branham, M. Ross Alexander, Robert
B. Ross, Yan Feng, Leslie-Anne Levy, Weijie Su, Camillo J. Taylor | WildfireGPT: Tailored Large Language Model for Wildfire Analysis | null | null | null | null | cs.AI | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Recent advancement of large language models (LLMs) represents a
transformational capability at the frontier of artificial intelligence.
However, LLMs are generalized models, trained on extensive text corpus, and
often struggle to provide context-specific information, particularly in areas
requiring specialized knowledge, such as wildfire details within the broader
context of climate change. For decision-makers focused on wildfire resilience
and adaptation, it is crucial to obtain responses that are not only precise but
also domain-specific. To that end, we developed WildfireGPT, a prototype LLM
agent designed to transform user queries into actionable insights on wildfire
risks. We enrich WildfireGPT by providing additional context, such as climate
projections and scientific literature, to ensure its information is current,
relevant, and scientifically accurate. This enables WildfireGPT to be an
effective tool for delivering detailed, user-specific insights on wildfire
risks to support a diverse set of end users, including but not limited to
researchers and engineers, for making positive impact and decision making.
| [
{
"version": "v1",
"created": "Mon, 12 Feb 2024 18:41:55 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Aug 2024 19:01:23 GMT"
}
] | 2024-08-30T00:00:00 | [
[
"Xie",
"Yangxinyu",
""
],
[
"Jiang",
"Bowen",
""
],
[
"Mallick",
"Tanwi",
""
],
[
"Bergerson",
"Joshua David",
""
],
[
"Hutchison",
"John K.",
""
],
[
"Verner",
"Duane R.",
""
],
[
"Branham",
"Jordan",
""
],
[
"Alexander",
"M. Ross",
""
],
[
"Ross",
"Robert B.",
""
],
[
"Feng",
"Yan",
""
],
[
"Levy",
"Leslie-Anne",
""
],
[
"Su",
"Weijie",
""
],
[
"Taylor",
"Camillo J.",
""
]
] | |
1412.6974 | Tomaz Prosen | Marcin Mierzejewski, Peter Prelovsek, and Tomaz Prosen | Local and Quasilocal Conserved Quantities in Integrable Systems | 7 pages in RevTex with 5 eps figures, version as accepted in
Phys.Rev.Lett | Phys. Rev. Lett. 114, 140601 (2015) | 10.1103/PhysRevLett.114.140601 | null | cond-mat.stat-mech cond-mat.str-el quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We outline a procedure for counting and identifying a complete set of local
and quasilocal conserved operators in integrable lattice systems. The method
yields a systematic generation of all independent, conserved quasilocal
operators related to time-average of local operators with a support on up to M
consecutive sites. As an example we study the anisotropic Heisenberg spin-1/2
chain and show that the number of independent conserved operators grows
linearly with M. Besides the known local operators there exist novel quasilocal
conserved quantities in all the parity sectors. The existence of quasilocal
conserved operators is shown also for the isotropic Heisenberg model.
Implications for the anomalous relaxation of quenched systems are discussed as
well.
| [
{
"version": "v1",
"created": "Mon, 22 Dec 2014 13:36:59 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Mar 2015 06:41:54 GMT"
}
] | 2015-04-16T00:00:00 | [
[
"Mierzejewski",
"Marcin",
""
],
[
"Prelovsek",
"Peter",
""
],
[
"Prosen",
"Tomaz",
""
]
] | |
hep-lat/9710090 | Rajan Gupta | Rajan Gupta | B-parameters of 4-fermion operators from lattice QCD | 3 pages. Package submitted in uufiles format: unpack and latex
paper.tex. Talk presented at LATTICE97 (Light Hadron Phenomenology) | Nucl.Phys.Proc.Suppl. 63 (1998) 278-280 | 10.1016/S0920-5632(97)00745-7 | LAUR-97-4154 | hep-lat hep-ph | null | This talk summarizes the status of the calculations of $B_K$, $B_7$, $B_8$,
and $B_s$, done in collaboration with T. Bhattacharya, G. Kilcup, and S.
Sharpe. Results for staggered, Wilson, and Clover fermions are presented.
| [
{
"version": "v1",
"created": "Tue, 28 Oct 1997 00:57:16 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Gupta",
"Rajan",
""
]
] | |
0810.1326 | Oiwei Ivy Wong | O. Ivy Wong (Yale), Rachel Webster (U Melbourne), Virginia Kilborn
(Swinburne), Meryl Waugh (Swinburne), Lister Staveley-Smith (UWA) | NOIRCAT - The Northern HIPASS Optical/IR Catalogue | 17 pages, 10 figures, accepted for publication in MNRAS; some changes
in Section 3 | null | 10.1111/j.1365-2966.2009.15436.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the Northern HIPASS Optical/InfraRed CATalogue (NOIRCAT), an
optical/near-infrared counterpart to the Northern HIPASS catalogue (NHICAT). Of
the 1002 sources in NHICAT, 655 (66%) have optical counterparts with matching
optical velocities. A further 85 (8%) sources have optical counterparts with
matching velocities from previous radio emission-line surveys. We find a
correlation between the gas and stellar content of the NOIRCAT sources. Our
HI-selected sample of isolated galaxies also present a wider range in
near-infrared (NIR) colours than previous optically-selected studies of
regular, isolated galaxies. All HI detections in optically unobscured fields
could be matched with either a NED optical counterpart, or a galaxy visible in
POSSII or DSS images. However, as over 200 of these matched galaxies have no
velocity information, further follow-up observations are needed to confirm the
matches, and hence confirm or deny the existence of dark galaxies in this
dataset.
| [
{
"version": "v1",
"created": "Wed, 8 Oct 2008 00:48:13 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Jul 2009 21:18:31 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Wong",
"O. Ivy",
"",
"Yale"
],
[
"Webster",
"Rachel",
"",
"U Melbourne"
],
[
"Kilborn",
"Virginia",
"",
"Swinburne"
],
[
"Waugh",
"Meryl",
"",
"Swinburne"
],
[
"Staveley-Smith",
"Lister",
"",
"UWA"
]
] | |
2412.16498 | Juan Pablo Velasquez-Rodriguez | J.P. Velasquez-Rodriguez | Unitary dual and matrix coefficients of compact nilpotent p-adic Lie
groups with dimension $d \leq 5$ | null | null | 10.13140/RG.2.2.17074.72648 | null | math.RT | http://creativecommons.org/licenses/by/4.0/ | Let p> 2 be a prime number, and let G be a compact nilpotent p-adic Lie group
with nilpotency class N<p. In this note we calculate explicitly the unitary
dual and the matrix coefficients of every compact nilpotent-adic Lie group with
dimension less or equal than 5. As an application, we provide the corresponding
spectral theorem for the Vladimirov sub-Laplacian, and show how this operator
provides a non-trivial example of a globally hypoelliptic operator on compact
nilpotent p-adic Lie groups.
| [
{
"version": "v1",
"created": "Sat, 21 Dec 2024 05:59:42 GMT"
}
] | 2024-12-24T00:00:00 | [
[
"Velasquez-Rodriguez",
"J. P.",
""
]
] | |
2205.09326 | YanHong Yao | Yan-Hong Yao, Xin-He Meng | Testing backreaction effects with type Ia supernova data and
observational Hubble parameter data | 16 pages, 6 figures, 3 table. arXiv admin note: substantial text
overlap with arXiv:1707.00111 | null | null | null | astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The backreaction term ${\cal Q}_\CD$ and the averaged spatial Ricci scalar
$\average{\CR}$ in the spatially averaged inhomogeneous Universe can be used to
combine into effective perfect fluid energy density $\varrho_{\rm eff}^{\CD}$
and pressure $p_{\rm eff}^{\CD}$ that can be regarded as new effective sources
for the backreaction effects. In order to model the realistic evolution of
backreaction, we adopt the Chevallier-Polarski-Linder(CPL) parameterizations of
the equation of state(EoS) of the effective perfect fluid. To deal with
observations in the backreaction context, in this paper, we employ two metrics
to describe the the late time Universe, one of them is the standard
Friedmann-Lema\^{\i}tre-Robertson-Walker(FLRW) metric, and the other is a
template metric with an evolving curvature parameter introduced by Larena et.
al. in \cite{larena2009testing}. We also fit the CPL backreaction model using
type Ia supernova(SN Ia) data and observational Hubble parameter data(OHD) with
these two metrics, and find out that parameter tensions between two different
data sets are larger when the backreaction model is equipped with the template
metric, therefore we conclude that the prescription of the geometrical
instantaneous spatially-constant curvature $\kappa_{\CD}$ needs to be modified.
| [
{
"version": "v1",
"created": "Thu, 19 May 2022 05:28:47 GMT"
}
] | 2022-05-20T00:00:00 | [
[
"Yao",
"Yan-Hong",
""
],
[
"Meng",
"Xin-He",
""
]
] | |
hep-ph/0201102 | Ababiy Vitaliy | A. Kolchuzhkin, A. Potylitsyn, S. Strokov, V. Ababiy | Stochastics of Multiple Electron-Photon Head-on Collisions | 12 pages, 7 figures | Nucl.Instrum.Meth. B201 (2003) 307-314 | 10.1016/S0168-583X(02)01525-2 | null | hep-ph | null | The problem of stochastis in multiple electron-photon head-on collisions has
been considered in this paper. The kinetic equations for the distributions over
the electron energy and collisions number along with the equations for these
distributions moments have been obtained. The equations for the first moments
have been solved by the iteration method. It has been shown that the variance
of the energy distribution as a function of the mean number of collisions has a
maximum at some value of $\bar n$. It is seen from this analysis that multiple
scattering of electrons influences on the spectra both electrons and photons
even for the photon target of small thickness. The data of approximate
analytical calculations agree with the results of the Monte Carlo simulation.
| [
{
"version": "v1",
"created": "Sat, 12 Jan 2002 03:45:49 GMT"
}
] | 2009-11-07T00:00:00 | [
[
"Kolchuzhkin",
"A.",
""
],
[
"Potylitsyn",
"A.",
""
],
[
"Strokov",
"S.",
""
],
[
"Ababiy",
"V.",
""
]
] | |
2003.06140 | Shuta Tanaka | Shuta J. Tanaka and Kenji Toma | Efficient acceleration of cylindrical jets: effects of radiative cooling
and tangled magnetic field | Accepted for publication in MNRAS, 12 pages, 4 figures, 1 table | null | 10.1093/mnras/staa728 | null | astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Diverging supersonic flows are accelerating, as in the case of a de Laval
nozzle, and the same concept has been applied for acceleration of
magnetohydrodynamic flows in the universe. Here, we study the dynamics of
"non-diverging" cylindrical supersonic flows and show that they can be
accelerated by effects of radiative cooling and the tangled magnetic field. In
addition to radiative cooling of the jet materials (cooling effect), conversion
of the ordered magnetic field into the turbulent one (conversion effect) and
dissipation of the turbulent magnetic field (dissipation effect) are formulated
according to our study on pulsar wind nebulae. Although each of the cooling and
conversion effects is an ineffective acceleration process, the terminal
velocity of magnetized cylindrical jets attains about half of the maximum
possible value when the cooling, conversion and dissipation effects work
simultaneously. The radiation efficiency is also about half of the total
luminosity of the jet in the case of maximal acceleration. The concept for flow
acceleration by the non-ideal MHD effects may be useful for studying
relativistic jets in active galactic nuclei, in which the region near the jet
axis is expected to be cylindrical and kink unstable.
| [
{
"version": "v1",
"created": "Fri, 13 Mar 2020 07:38:39 GMT"
}
] | 2020-03-25T00:00:00 | [
[
"Tanaka",
"Shuta J.",
""
],
[
"Toma",
"Kenji",
""
]
] | |
1305.7136 | Oscar {\AA}kerlund | Oscar Akerlund, Philippe de Forcrand, Antoine Georges, Philipp Werner | Dynamical Mean Field Approximation Applied to Quantum Field Theory | 15 pages, 10 figures, Version to appear in PRD. Changes include:
Comparison to cluster extensions of Mean Field Theory, one figure added and
one replaced, clarified description of method and extended discussion on
possible extensions | Phys. Rev. D 88, 125006 (2013) | 10.1103/PhysRevD.88.125006 | CERN-PH-TH/2013-097 | hep-lat cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the Dynamical Mean Field (DMFT) approximation to the real, scalar
phi^4 quantum field theory. By comparing to lattice Monte Carlo calculations,
perturbation theory and standard mean field theory, we test the quality of the
approximation in two, three, four and five dimensions. The quantities
considered in these tests are the critical coupling for the transition to the
ordered phase and the associated critical exponents nu and beta. We also map
out the phase diagram in four dimensions. In two and three dimensions, DMFT
incorrectly predicts a first order phase transition for all bare quartic
couplings, which is problematic, because the second order nature of the phase
transition of lattice phi^4-theory is crucial for taking the continuum limit.
Nevertheless, by extrapolating the behaviour away from the phase transition,
one can obtain critical couplings and critical exponents. They differ from
those of mean field theory and are much closer to the correct values. In four
dimensions the transition is second order for small quartic couplings and turns
weakly first order as the coupling increases beyond a tricritical value. In
dimensions five and higher, DMFT gives qualitatively correct results, predicts
reasonable values for the critical exponents and considerably more accurate
critical couplings than standard mean field theory. The approximation works
best for small values of the quartic coupling. We investigate the change from
first to second order transition in the local limit of DMFT which is
computationally much less intensive. We also discuss technical issues related
to the convergence of the non-linear self-consistency equation solver and the
solution of the effective single-site model using Fourier-space Monte Carlo
updates in the presence of a phi^4-interaction.
| [
{
"version": "v1",
"created": "Thu, 30 May 2013 15:19:13 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Nov 2013 16:42:12 GMT"
}
] | 2013-12-16T00:00:00 | [
[
"Akerlund",
"Oscar",
""
],
[
"de Forcrand",
"Philippe",
""
],
[
"Georges",
"Antoine",
""
],
[
"Werner",
"Philipp",
""
]
] | |
0711.2188 | Adam Shwartz | Rami Atar and Adam Shwartz | Efficient routing in heavy traffic under partial sampling of service
times | null | null | null | null | math.PR math.OC | null | We consider a queue with renewal arrivals and n exponential servers in the
Halfin-Whitt heavy traffic regime, where n and the arrival rate increase
without bound, so that a critical loading condition holds. Server k serves at
rate $\mu_k $, and the empirical distribution of the $\mu_k $ is assumed to
converge weakly. We show that very little information on the service rates is
required for a routing mechanism to perform well. More precisely, we construct
a routing mechanism that has access to a single sample from the service time
distribution of each of $n$ to the power of $1/2 + \epsilon $ randomly selected
servers, but not to the actual values of the service rates, the performance of
which is asymptotically as good as the best among mechanisms that have the
complete information on $ \mu_k $.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 12:59:20 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Atar",
"Rami",
""
],
[
"Shwartz",
"Adam",
""
]
] | |
2110.08107 | Cyrill Muratov | Anne Bernand-Mantel, Cyrill B. Muratov, and Valeriy V. Slastikov | A micromagnetic theory of skyrmion lifetime in ultrathin ferromagnetic
films | 6 pages, 1 figure | Proc. Natl. Acad. Sci. USA 119, e2122237119 (2022) | 10.1073/pnas.2122237119 | null | cond-mat.mtrl-sci cond-mat.mes-hall nlin.PS | http://creativecommons.org/licenses/by/4.0/ | We use the continuum micromagnetic framework to derive the formulas for
compact skyrmion lifetime due to thermal noise in ultrathin ferromagnetic films
with relatively weak interfacial Dzyaloshinskii-Moriya interaction. In the
absence of a saddle point connecting the skyrmion solution to the ferromagnetic
state, we interpret the skyrmion collapse event as ``capture by an absorber''
at microscale. This yields an explicit Arrhenius collapse rate with both the
barrier height and the prefactor as functions of all the material parameters,
as well as the dynamical paths to collapse.
| [
{
"version": "v1",
"created": "Fri, 15 Oct 2021 14:09:16 GMT"
}
] | 2022-08-02T00:00:00 | [
[
"Bernand-Mantel",
"Anne",
""
],
[
"Muratov",
"Cyrill B.",
""
],
[
"Slastikov",
"Valeriy V.",
""
]
] | |
gr-qc/0207057 | Gennady L. Krasnikov | S. Krasnikov | The quantum inequalities do not forbid spacetime shortcuts | Minor corrections and additions | Phys.Rev. D67 (2003) 104013 | 10.1103/PhysRevD.67.104013 | null | gr-qc | null | A class of spacetimes (comprising the Alcubierre bubble, Krasnikov tube, and
a certain type of wormholes) is considered that admits `superluminal travel' in
a strictly defined sense. Such spacetimes (they are called `shortcuts' in this
paper) were suspected to be impossible because calculations based on `quantum
inequalities' suggest that their existence would involve Planck-scale energy
densities and hence unphysically large values of the `total amount of negative
energy' E_tot. I argue that the spacetimes of this type may not be unphysical
at all. By explicit examples I prove that: 1) the relevant quantum inequality
does not (always) imply large energy densities; 2) large densities may not lead
to large values of E_tot; 3) large E_tot, being physically meaningless in some
relevant situations, does not necessarily exclude shortcuts.
| [
{
"version": "v1",
"created": "Mon, 15 Jul 2002 22:25:04 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Nov 2002 21:25:08 GMT"
},
{
"version": "v3",
"created": "Mon, 19 May 2003 13:14:26 GMT"
}
] | 2009-11-07T00:00:00 | [
[
"Krasnikov",
"S.",
""
]
] | |
0810.0601 | Josip Globevnik | Josip Globevnik | On meromorphic extendibility | 9 pages, to appear in J.Math.Anal.Appl | null | null | null | math.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let D be a bounded domain in the complex plane whose boundary bD consists of
finitely many pairwise disjoint real analytic simple closed curves. Let f be an
integrable function on bD. In the paper we show how to compute the candidates
for poles of a meromorphic extension of f through D and thus reduce the
question of meromorphic extendibility to the question of holomorphic
extendibility. Let A(D) be the algebra of all continuous functions on the
closure of D which are holomorphic on D. For continuous functions f on bD we
obtain a characterization of meromorphic extendibility in terms of the argument
principle: f extends meromorphically through D if and only if there is a
nonnegative integer N such that the winding number of Pf+Q along bD is bounded
below by -N for all P, Q in A(D) such that Pf+Q has no zero on bD. If this is
the case then the meromorphic extension of f has at most N poles in D, counting
multiplicity.
| [
{
"version": "v1",
"created": "Fri, 3 Oct 2008 09:48:32 GMT"
}
] | 2008-10-06T00:00:00 | [
[
"Globevnik",
"Josip",
""
]
] | |
1203.5772 | Cagdas Bilen | Cagdas Bilen, Yao Wang and Ivan Selesnick | Compressed Sensing for Moving Imagery in Medical Imaging | Submitted to IEEE Transactions on Image Processing | null | null | null | cs.MM cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerous applications in signal processing have benefited from the theory of
compressed sensing which shows that it is possible to reconstruct signals
sampled below the Nyquist rate when certain conditions are satisfied. One of
these conditions is that there exists a known transform that represents the
signal with a sufficiently small number of non-zero coefficients. However when
the signal to be reconstructed is composed of moving images or volumes, it is
challenging to form such regularization constraints with traditional transforms
such as wavelets. In this paper, we present a motion compensating prior for
such signals that is derived directly from the optical flow constraint and can
utilize the motion information during compressed sensing reconstruction.
Proposed regularization method can be used in a wide variety of applications
involving compressed sensing and images or volumes of moving and deforming
objects. It is also shown that it is possible to estimate the signal and the
motion jointly or separately. Practical examples from magnetic resonance
imaging has been presented to demonstrate the benefit of the proposed method.
| [
{
"version": "v1",
"created": "Mon, 26 Mar 2012 19:44:26 GMT"
}
] | 2012-03-27T00:00:00 | [
[
"Bilen",
"Cagdas",
""
],
[
"Wang",
"Yao",
""
],
[
"Selesnick",
"Ivan",
""
]
] | |
1803.07620 | Stephen Gill | S. T. Gill, J. Damasco, B. E. Janicek, M. S. Durkin, V. Humbert, S.
Gazibegovic, D. Car, E. P. A. M. Bakkers, P. Y. Huang, and N. Mason | Selective Area Superconductor Epitaxy to Ballistic Semiconductor
Nanowires | null | null | 10.1021/acs.nanolett.8b01534 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Semiconductor nanowires such as InAs and InSb are promising materials for
studying Majorana zero-modes and demonstrating non-Abelian particle exchange
relevant for topological quantum computing. While evidence for Majorana bound
states in nanowires has been shown, the majority of these experiments are
marked by significant disorder. In particular, the interfacial inhomogeneity
between the superconductor and nanowire is strongly believed to be the main
culprit for disorder and the resulting soft superconducting gap ubiquitous in
tunneling studies of hybrid semiconductor-superconductor systems. Additionally,
a lack of ballistic transport in nanowire systems can create bound states that
mimic Majorana signatures. We resolve these problems through the development of
selective-area epitaxy of Al to InSb nanowires, a technique applicable to other
nanowires and superconductors. Epitaxial InSb-Al devices generically possess a
hard superconducting gap and demonstrate ballistic 1D superconductivity and
near perfect transmission of supercurrents in the single mode regime,
requisites for engineering and controlling 1D topological superconductivity.
Additionally, we demonstrate that epitaxial InSb-Al superconducting island
devices, the building blocks for Majorana based quantum computing applications,
prepared using selective area epitaxy can achieve micron scale ballistic 1D
transport. Our results pave the way for the development of networks of
ballistic superconducting electronics for quantum device applications.
| [
{
"version": "v1",
"created": "Tue, 20 Mar 2018 19:44:53 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Mar 2018 01:18:42 GMT"
},
{
"version": "v3",
"created": "Tue, 11 Sep 2018 05:40:32 GMT"
}
] | 2018-09-12T00:00:00 | [
[
"Gill",
"S. T.",
""
],
[
"Damasco",
"J.",
""
],
[
"Janicek",
"B. E.",
""
],
[
"Durkin",
"M. S.",
""
],
[
"Humbert",
"V.",
""
],
[
"Gazibegovic",
"S.",
""
],
[
"Car",
"D.",
""
],
[
"Bakkers",
"E. P. A. M.",
""
],
[
"Huang",
"P. Y.",
""
],
[
"Mason",
"N.",
""
]
] | |
2008.07380 | Boudewijn Roukema | Boudewijn F. Roukema | [not Rp] Reproducibility of 'Poincare dodecahedral space parameter
estimates' | 8 pages, 1 table | null | 10.5281/zenodo.3956058 | null | cs.CY cs.SE | http://creativecommons.org/licenses/by/4.0/ | Is a scientific research paper based on (i) public, online observational data
files and (ii) providing free-licensed software for reproducing its results
easy to reproduce by the same author a decade later? This paper attempts to
reproduce a cosmic topology observational paper published in 2008 and
satisfying both criteria (i) and (ii). The reproduction steps are defined
formally in a free-licensed git repository package "0807.4260" and
qualitatively in the current paper. It was found that the effort in upgrading
the Fortran 77 code at the heart of the software, interfaced with a C front
end, and originally compiled with g77, in the content of the contemporary
gfortran compiler, risked being too great to be justified on any short time
scale. In this sense, the results of RBG08 are not as reproducible as they
appeared to be, despite both (i) data availability and (ii) free-licensing and
public availability of the software. The software and a script to reproduce the
steps of this incomplete reproduction are combined in a new git repository
named 0807.4260, following the ArXiv identity code (arXiv:0807.4260) of RBG08.
| [
{
"version": "v1",
"created": "Thu, 23 Jul 2020 21:56:21 GMT"
}
] | 2021-02-10T00:00:00 | [
[
"Roukema",
"Boudewijn F.",
""
]
] | |
2412.04395 | Aaron Lattanzi | Aaron Lattanzi, Ann Almgren, Eliot Quon, Mahesh Natarajan, Branko
Kosovic, Jeff Mirocha, Bruce Perry, David Wiersema, Donald Willcox, Xingqiu
Yuan, Weiqun Zhang | ERF: Energy Research and Forecasting Model | null | null | null | null | physics.ao-ph physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High performance computing (HPC) architectures have undergone rapid
development in recent years. As a result, established software suites face an
ever increasing challenge to remain performant on and portable across modern
systems. Many of the widely adopted atmospheric modeling codes cannot fully (or
in some cases, at all) leverage the acceleration provided by General-Purpose
Graphics Processing Units (GPGPUs), leaving users of those codes constrained to
increasingly limited HPC resources. Energy Research and Forecasting (ERF) is a
regional atmospheric modeling code that leverages the latest HPC architectures,
whether composed of only Central Processing Units (CPUs) or incorporating GPUs.
ERF contains many of the standard discretizations and basic features needed to
model general atmospheric dynamics as well as flows relevant to renewable
energy. The modular design of ERF provides a flexible platform for exploring
different physics parameterizations and numerical strategies. ERF is built on a
state-of-the-art, well-supported, software framework (AMReX) that provides a
performance portable interface and ensures ERF's long-term sustainability on
next generation computing systems. This paper details the numerical methodology
of ERF and presents results for a series of verification and validation cases.
| [
{
"version": "v1",
"created": "Thu, 5 Dec 2024 18:10:56 GMT"
}
] | 2024-12-06T00:00:00 | [
[
"Lattanzi",
"Aaron",
""
],
[
"Almgren",
"Ann",
""
],
[
"Quon",
"Eliot",
""
],
[
"Natarajan",
"Mahesh",
""
],
[
"Kosovic",
"Branko",
""
],
[
"Mirocha",
"Jeff",
""
],
[
"Perry",
"Bruce",
""
],
[
"Wiersema",
"David",
""
],
[
"Willcox",
"Donald",
""
],
[
"Yuan",
"Xingqiu",
""
],
[
"Zhang",
"Weiqun",
""
]
] | |
1803.09140 | Bingqing Cheng | Bingqing Cheng, Michele Ceriotti | Computing the Tolman length for solid-liquid interfaces | null | null | 10.1063/1.5038396 | null | cond-mat.stat-mech cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The curvature dependence of interfacial free energy, which is crucial in
quantitatively predicting nucleation kinetics and the stability of bubbles and
droplets, can be described in terms of the Tolman length {\delta}. For
solid-liquid interfaces, however,{\delta} has never been computed directly due
to various theoretical and practical challenges. Here we present a general
method that enables the direct evaluation of the Tolman length from atomistic
simulations of a solid-liquid planar interface in out-of-equilibrium
conditions. This method works by first measuring the surface tension from the
amplitude of thermal capillary fluctuations of a localized version of Gibbs
dividing surface, and bythen computing the free energy difference between the
surface of tension and the equimolar dividing surface. For benchmark purposes,
we computed {\delta}for a model potential, and compared the results to less
rigorous indirect approaches.
| [
{
"version": "v1",
"created": "Sat, 24 Mar 2018 17:57:26 GMT"
}
] | 2018-08-01T00:00:00 | [
[
"Cheng",
"Bingqing",
""
],
[
"Ceriotti",
"Michele",
""
]
] | |
1808.07685 | Li Liang | Li Liang | Homology theories and Gorenstein dimensions for complexes | Final version, to appear in Algebras and Representation Theory | null | null | null | math.RA math.KT math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we first study the Gorenstein projective/flat dimension of
complexes of modules. The relation between the Gorenstein projective/flat
dimension for complexes and that for modules are investigated. Then we study
Tate, stable and unbounded homology for complexes of modules. In the case of
module arguments, we get some results that improve the known results.
| [
{
"version": "v1",
"created": "Thu, 23 Aug 2018 10:11:08 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2019 13:06:13 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Sep 2020 13:36:37 GMT"
}
] | 2020-09-18T00:00:00 | [
[
"Liang",
"Li",
""
]
] | |
astro-ph/0308541 | Rafal Idzi | Rafal Idzi, Rachel Somerville, Casey Papovich, Henry C. Ferguson,
Mauro Giavalisco, Claudia Kretchmer, Jennifer Lotz | The z ~ 4 Lyman Break Galaxies: Colors and Theoretical Predictions | 12 pages, including 4 figures; submitted to and accepted by ApJL --
to be published in a special issue of early release GOODS results | Astrophys.J.600:L115-L118,2004 | 10.1086/378579 | null | astro-ph | null | We investigate several fundamental properties of z ~ 4 Lyman-break galaxies
by comparing observations with the predictions of a semi-analytic model based
on the Cold Dark Matter theory of hierarchical structure formation. We use a
sample of B_{435}-dropouts from the Great Observatories Origins Deep Survey,
and complement the ACS optical B_{435}, V_{606}, i_{775}, and z_{850} data with
the VLT ISAAC J, H, and K_{s} observations. We extract B_{435}-dropouts from
our semi-analytic mock catalog using the same color criteria and magnitude
limits that were applied to the observed sample. We find that the i_{775} -
K_{s} colors of the model-derived and observed B_{435}-dropouts are in good
agreement. However, we find that the i_{775}-z_{850} colors differ
significantly, indicating perhaps that either too little dust or an incorrect
extinction curve have been used. Motivated by the reasonably good agreement
between the model and observed data we present predictions for the stellar
masses, star formation rates, and ages for the z ~ 4 Lyman-break sample. We
find that according to our model the color selection criteria used to select
our z ~ 4 sample surveys 67% of all galaxies at this epoch down to z_{850} <
26.5. We find that our model predicts a roughly 40% mass build-up between the z
\~ 4 and z ~ 3 epochs for the UV rest-frame L* galaxies. Furthermore, according
to our model, at least 50% of the total stellar mass resides in relatively
massive UV-faint objects that fall below our observational detection limit.
| [
{
"version": "v1",
"created": "Fri, 29 Aug 2003 16:08:35 GMT"
}
] | 2009-11-10T00:00:00 | [
[
"Idzi",
"Rafal",
""
],
[
"Somerville",
"Rachel",
""
],
[
"Papovich",
"Casey",
""
],
[
"Ferguson",
"Henry C.",
""
],
[
"Giavalisco",
"Mauro",
""
],
[
"Kretchmer",
"Claudia",
""
],
[
"Lotz",
"Jennifer",
""
]
] | |
hep-th/0009095 | Martin Gremm | Martin Gremm | Compactified NCOS and duality | 16 pages, references corrected | JHEP 0108:052,2001 | 10.1088/1126-6708/2001/08/052 | PUPT-1951 | hep-th | null | We study four-dimensional U(1) on a non-commutative T^2 with rational Theta.
This theory has dual descriptions as ordinary SYM or as NCOS. We identify a set
of massive non-interacting KK states in the SYM theory and track them through
the various dualities. They appear as stretched strings in the non-commutative
U(1) providing another example of the IR/UV mixing in non-commutative field
theories. In the NCOS these states appear as D-strings with winding and
momentum. They form an unconventional type of 1/4 BPS state with the 3-brane.
To obtain a consistent picture of S-duality for compactified theories it is
essential to keep track of both the NS and the RR B-fields.
| [
{
"version": "v1",
"created": "Tue, 12 Sep 2000 15:38:51 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Sep 2000 14:59:34 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Gremm",
"Martin",
""
]
] | |
2103.07196 | Sebastian Franz Dr. | Sebastian Franz | Anisotropic $H_{div}$-norm error estimates for rectangular
$H_{div}$-elements | 6 pages | null | null | null | math.NA cs.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the discretisation of $H_{div}$-functions on rectangular meshes there are
at least three families of elements, namely Raviart-Thomas-,
Brezzi-Douglas-Marini- and Arnold-Boffi-Falk-elements. In order to prove
convergence of a numerical method using them, sharp interpolation error
estimates are important. We provide them here in an anisotropic setting for the
$H_{div}$-norm.
| [
{
"version": "v1",
"created": "Fri, 12 Mar 2021 10:35:46 GMT"
}
] | 2021-03-15T00:00:00 | [
[
"Franz",
"Sebastian",
""
]
] | |
2311.06016 | Alexander Muratov | Alexey M. Astakhov, Vladislav S. Petrovskii, Maria A. Frolkina,
Anastasia A. Markina, Alexander D. Muratov, Alexander F. Valov, and Vladik A.
Avetisov | Spontaneous Vibrations and Stochastic Resonance of Short Oligomeric
Springs | arXiv admin note: substantial text overlap with arXiv:2110.04096 | null | 10.3390/nano14010041 | null | cond-mat.soft cond-mat.mtrl-sci | http://creativecommons.org/licenses/by/4.0/ | There is growing interest in molecular structures that exhibit dynamics
similar to bistable mechanical systems. These structures have the potential to
be used as nanodevices with two distinct states. Particularly intriguing are
structures that display spontaneous vibrations and stochastic resonance.
Previously, through molecular dynamics simulations, it was discovered that
short pyridine-furan springs, when subjected to force loading, exhibit the
bistable dynamics of a Duffing oscillator. In this study, we extend these
simulations to include short pyridine-pyrrole and pyridine-furan springs in a
hydrophobic solvent. Our findings demonstrate that these systems also display
the bistable dynamics of a Duffing oscillator, accompanied by spontaneous
vibrations and stochastic resonance activated by thermal noise.
| [
{
"version": "v1",
"created": "Fri, 10 Nov 2023 12:00:20 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Nov 2023 14:16:04 GMT"
}
] | 2024-11-27T00:00:00 | [
[
"Astakhov",
"Alexey M.",
""
],
[
"Petrovskii",
"Vladislav S.",
""
],
[
"Frolkina",
"Maria A.",
""
],
[
"Markina",
"Anastasia A.",
""
],
[
"Muratov",
"Alexander D.",
""
],
[
"Valov",
"Alexander F.",
""
],
[
"Avetisov",
"Vladik A.",
""
]
] | |
2011.08306 | Valanarasu Jeya Maria Jose | Jeya Maria Jose Valanarasu, Vishal M. Patel | Overcomplete Deep Subspace Clustering Networks | WACV 2021 | null | null | null | cs.CV cs.LG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Deep Subspace Clustering Networks (DSC) provide an efficient solution to the
problem of unsupervised subspace clustering by using an undercomplete deep
auto-encoder with a fully-connected layer to exploit the self expressiveness
property. This method uses undercomplete representations of the input data
which makes it not so robust and more dependent on pre-training. To overcome
this, we propose a simple yet efficient alternative method - Overcomplete Deep
Subspace Clustering Networks (ODSC) where we use overcomplete representations
for subspace clustering. In our proposed method, we fuse the features from both
undercomplete and overcomplete auto-encoder networks before passing them
through the self-expressive layer thus enabling us to extract a more meaningful
and robust representation of the input data for clustering. Experimental
results on four benchmark datasets show the effectiveness of the proposed
method over DSC and other clustering methods in terms of clustering error. Our
method is also not as dependent as DSC is on where pre-training should be
stopped to get the best performance and is also more robust to noise. Code -
\href{https://github.com/jeya-maria-jose/Overcomplete-Deep-Subspace-Clustering}{https://github.com/jeya-maria-jose/Overcomplete-Deep-Subspace-Clustering
| [
{
"version": "v1",
"created": "Mon, 16 Nov 2020 22:07:18 GMT"
}
] | 2020-11-18T00:00:00 | [
[
"Valanarasu",
"Jeya Maria Jose",
""
],
[
"Patel",
"Vishal M.",
""
]
] | |
2201.13014 | JeongHyeong Park | Yunhee Euh, Jihun Kim, and JeongHyeong Park | Curvature identities for Einstein manifolds of dimension 5 and 6 | 15 pages | null | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Patterson discussed the curvature identities on Riemannian manifolds in [14],
and a curvature identity for any 6-dimensional Riemannian manifold was
independently derived from the Chern-Gauss-Bonnet Theorem [8]. In this paper,
we provide the explicit formulae of Patterson's curvature identity that holds
on 5-dimensional and 6-dimensional Einstein manifolds. We confirm that the
curvature identities on the Einstein manifold from the previous work [8] are
the same as the curvature identities deduced from Patterson's result. We also
provide examples that support the theorems.
| [
{
"version": "v1",
"created": "Mon, 31 Jan 2022 06:12:12 GMT"
}
] | 2022-02-01T00:00:00 | [
[
"Euh",
"Yunhee",
""
],
[
"Kim",
"Jihun",
""
],
[
"Park",
"JeongHyeong",
""
]
] | |
2009.03589 | Roland Speicher | Roland Speicher | Lecture Notes on "Non-Commutative Distributions" | null | null | null | null | math.OA math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This in an introduction to the theory of non-commutative distributions of
non-commuting operators or random matrices. Starting from the basic problem to
find a good approach to the meaning of "non-commutative distribution" we will,
in particular, cover: free analysis, which is a version of complex analysis for
several non-commuting variables; the operator-valued version of free
probability theory (combinatorial but also analytic aspects); the linearization
trick to reduce non-linear scalar problems to linear operator-valued problems;
the combination of operator-valued convolution and linearization to calculate
the distribution of polynomials in free variables; the basic theory of
non-commutative rational functions. On one hand, this is a continuation of the
Lecture Notes on "Free Probability", arXiv:1908.08125. On the other hand, the
theory of free probability is developed again, but in a more general,
operator-valued context. So, in principle and with some additional efforts, it
should be possible to read the present notes without having a prior knowledge
on free probability. Big parts of the material do also not deal so much with
free variables, but more general with analytic and algebraic aspects of maximal
non-commuting variables. The material here was presented in the summer term
2019 at Saarland University in 20 lectures of 90 minutes each. The lectures
were recorded and can be found online at
https://www.math.uni-sb.de/ag/speicher/web_video/index.html.
| [
{
"version": "v1",
"created": "Tue, 8 Sep 2020 09:00:49 GMT"
}
] | 2020-09-09T00:00:00 | [
[
"Speicher",
"Roland",
""
]
] | |
2210.04103 | Hugo Maia | Hugo P. Maia, Silvio C. Ferreira, Marcelo L. Martins | Controversy-seeking fuels rumor-telling activity in polarized opinion
networks | 11 pages, 7 figures | null | 10.1016/j.chaos.2023.113287 | null | physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rumors have ignited revolutions, undermined the trust in political parties,
or threatened the stability of human societies. Such destructive potential has
been significantly enhanced by the development of on-line social networks.
Several theoretical and computational studies have been devoted to
understanding the dynamics and to control rumor spreading. In the present work,
a model of rumor-telling in opinion polarized networks was investigated through
extensive computer simulations. The key mechanism is the coupling between ones'
opinions and their leaning to spread a given information, either by supporting
or opposing its content. We report that a highly modular topology of polarized
networks strongly impairs rumor spreading, but the couplings between agent's
opinions and their spreading/stifling rates can either further inhibit or,
conversely, foster information propagation, depending on the nature of those
couplings. In particular, a controversy-seeking mechanism, in which agents are
stimulated to postpone their transitions to the stiffer state upon interactions
with other agents of confronting opinions, enhances the rumor spreading.
Therefore such a mechanism is capable of overcoming the propagation bottlenecks
imposed by loosely connected modular structures.
| [
{
"version": "v1",
"created": "Sat, 8 Oct 2022 20:38:53 GMT"
}
] | 2023-03-22T00:00:00 | [
[
"Maia",
"Hugo P.",
""
],
[
"Ferreira",
"Silvio C.",
""
],
[
"Martins",
"Marcelo L.",
""
]
] | |
2012.11498 | Chris Ekpo c. M. Ekpo | C. M. Ekpo, J. E. Osang and E. B. Ettah | Solutions of the Schrodinger Equation for Modified Mobius Square
Potential using two Approximation Scheme | 9 pages, 2064 words,. arXiv admin note: text overlap with
arXiv:2012.02581 | null | null | null | quant-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, the Schrodinger equation for s-wave and arbitrary angular
momenta with the Modified Mobuis Square potential is investigated respectively.
The eigenfunctions as well as energy eigenvalues are obtained in an exact
analytical manner via the Nikiforov Uvarov method using two approximations
scheme. Some special cases of this potentials are also studied.
| [
{
"version": "v1",
"created": "Fri, 18 Dec 2020 11:53:57 GMT"
}
] | 2020-12-22T00:00:00 | [
[
"Ekpo",
"C. M.",
""
],
[
"Osang",
"J. E.",
""
],
[
"Ettah",
"E. B.",
""
]
] | |
math/0701366 | Matja\v{z} Konvalinka | Matjaz Konvalinka | On Goulden-Jackson's determinantal expression for the immanant | null | null | null | null | math.CO | null | In 1992, Goulden and Jackson found a beautiful determinantal expression for
the immanant of a matrix. This paper proves the same result combinatorially.
| [
{
"version": "v1",
"created": "Fri, 12 Jan 2007 22:53:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Konvalinka",
"Matjaz",
""
]
] | |
2004.00633 | Douglas Boubert | Douglas Boubert, Denis Erkal, Alessia Gualandris | Deflection of the hypervelocity stars by the dance of the Milky Way and
Large Magellanic Cloud | 12 pages, submitted to MNRAS | null | null | null | astro-ph.GA astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stars slingshotted by the supermassive black hole at the Galactic centre will
escape the Milky Way so quickly that their trajectories will be almost straight
lines. Previous works have shown how these `hypervelocity stars' are
subsequently deflected by the gravitational field of the Milky Way and the
Large Magellanic Cloud (LMC), but have neglected to account for the reflex
motion of the Milky Way in response to the fly by of the LMC. A consequence of
this motion is that the hypervelocity stars we see on the outskirts of the
Milky Way today were ejected from where the Milky Way centre was hundreds of
millions of years ago. This change in perspective causes large apparent
deflections in the trajectories of the hypervelocity stars, which are of the
same order as the deflections caused by the gravitational force of the Milky
Way and LMC. We quantify these deflections by simulating the production of
hypervelocity stars in an isolated Milky Way (with a spherical or flattened
dark matter halo), in a fixed-in-place Milky Way with a passing LMC, and in a
Milky Way which responds to the passage of the LMC. The proper motion precision
necessary to measure these deflections will be possible with the combination of
Gaia with the proposed GaiaNIR successor mission, and these measurements will
unlock the hypervelocity stars as probes of the shape of the Milky Way, the
mass of the LMC, and of the dance of these two galaxies.
| [
{
"version": "v1",
"created": "Wed, 1 Apr 2020 18:00:01 GMT"
}
] | 2020-04-03T00:00:00 | [
[
"Boubert",
"Douglas",
""
],
[
"Erkal",
"Denis",
""
],
[
"Gualandris",
"Alessia",
""
]
] | |
2203.13728 | Marcin Ma\'zdziarz | Marcin Ma\'zdziarz, Rafa{\l} Psiuk, Agnieszka Krawczy\'nska,
Ma{\l}gorzata Lewandowska and Tomasz Mo\'scicki | Effect of zirconium doping on mechanical properties of $W_{1-x}Zr_xB_2$
on the base of ab initio calculations and magnetron sputtered films | 38 pages, 26 figures | Archives of Civil and Mechanical Engineering (2022) 22:193 | 10.1007/s43452-022-00513-6 | null | cond-mat.mtrl-sci physics.app-ph | http://creativecommons.org/licenses/by/4.0/ | Potentially superhard $W_{1-x}Zr_xB_2$ polymorph hP6-P6$_3$/mmc-$WB_2$ with
zirconium doping in the range of x=0.0-0.25 was thoroughly analyzed within the
framework of first-principles density functional theory from the structural and
mechanical point of view. The obtained results were subsequently compared with
properties of material deposited by magnetron sputtering method. All predicted
structures are mechanically and thermodynamically stable. Due to theoretical
calculations zirconium doping reduces hardness and fracture toughness $K_{IC}$
of $WB_2$. Deposited films are characterized by greater hardness $H_v$ but
lower fracture toughness $K_{IC}$. The results of experiments show that not
only solid solution hardening is responsible for strengthening of predicted new
material but also change of microstructure, Hall-Petch effect and boron
vacancies.
| [
{
"version": "v1",
"created": "Fri, 25 Mar 2022 16:00:36 GMT"
}
] | 2022-09-01T00:00:00 | [
[
"Maździarz",
"Marcin",
""
],
[
"Psiuk",
"Rafał",
""
],
[
"Krawczyńska",
"Agnieszka",
""
],
[
"Lewandowska",
"Małgorzata",
""
],
[
"Mościcki",
"Tomasz",
""
]
] | |
hep-ph/9712204 | Silvana Filipponi | S.Filipponi (1 and 2) and Y.Srivastava (2 and 3) ((1) Harvard U.,
Cambridge, Mass, USA; (2) U. di Perugia e INFN-Sezione di Perugia, Italy; (3)
Northeastern U., Boston Mass, USA) | Hadronic Masses and Regge Trajectories | 19 pages, 9 Figures, IV Tables | Phys.Rev. D58 (1998) 016003 | 10.1103/PhysRevD.58.016003 | HUTP/97-A093 | hep-ph | null | A comprehensive phenomenological analysis of experimental data and some
theoretical models is presented here (for mesons) to critically discuss how
Regge trajectory parameters depend on flavor. Through analytic continuation of
physical trajectories (obtained from resonance data) into the space like
region, we derive the suppression factor for heavy flavor production. The case
of our D Regge exchange, both for D and $\Lambda_c$ production, is considered
in some detail. Good agreement with data is reached confirming that indeed the
slopes of heavier flavors decrease. This result suggests that the confinement
potential has a substantial dependence on the quark masses. In a simple
non-relativistic model, constrained to produce linear Regge trajectories, it is
shown that a linear quark mass dependence is required (in the confinement part
of the potential) in order for the slope to decrease in the appropriate way.
| [
{
"version": "v1",
"created": "Sat, 29 Nov 1997 16:29:02 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Filipponi",
"S.",
"",
"1 and 2"
],
[
"Srivastava",
"Y.",
"",
"2 and 3"
]
] | |
1711.06984 | Armen Sedrakian | Armen Sedrakian (FIAS), John W. Clark (Washington U., St. Louis) | Toward electrodynamics of unconventional phases of dilute nuclear matter | Invited contribution presented by A. S. at the 19th International
Conference on Recent Progress in Many-Body Theories, June 25-30, 2017, APCTP,
Pohang, Korea, v1: 8 pages, 2 figs | Journal of Physics: Conf. Series 1041 (2018) 012008 | 10.1088/1742-6596/1041/1/012008 | null | nucl-th astro-ph.HE cond-mat.quant-gas cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phase diagram of isospin-asymmetrical nuclear matter may feature a number
of unconventional phases, which include the translationally and rotationally
symmetric, but isospin-asymmetrical BCS condensate, the current-carrying
Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) phase, and the heterogeneous
phase-separated phase. Because the Cooper pairs of the condensate carry a
single unit of charge, these phases are charged superconductors and respond to
electromagnetic gauge fields by either forming domains (type-I
superconductivity) or quantum vortices (type-II superconductivity). We evaluate
the Ginzburg-Landau (GL) parameter across the phase diagram and find that the
unconventional phases of isospin-asymmetrical nuclear matter are good type-II
superconductors and should form Abrikosov vortices with twice the quantum of
magnetic flux. We also find that the LOFF phase at the boundary of the
transition to the type-I state, with the GL parameter being close to the
critical value $1/\sqrt{2}$.
| [
{
"version": "v1",
"created": "Sun, 19 Nov 2017 08:41:41 GMT"
}
] | 2018-07-18T00:00:00 | [
[
"Sedrakian",
"Armen",
"",
"FIAS"
],
[
"Clark",
"John W.",
"",
"Washington U., St. Louis"
]
] | |
astro-ph/0401251 | Adrian Pope | Takahiko Matsubara, Alexander S. Szalay, and Adrian C. Pope | Eigenmode Analysis of Galaxy Distributions in Redshift Space | Submitted to ApJ | Astrophys.J. 606 (2004) 1-24 | 10.1086/382783 | null | astro-ph | null | Eigenmode analysis is one of the most promising methods of analyzing large
data sets in ongoing and near-future galaxy surveys. In such analyses, a fast
evaluation of the correlation matrix in arbitrary cosmological models is
crucial. The observational effects, including peculiar velocity distortions in
redshift space, light-cone effects, selection effects, and effects of the
complex shape of the survey geometry, should be taken into account in the
analysis. In the framework of the linear theory of gravitational instability,
we provide the methodology to quickly compute the correlation matrix. Our
methods are not restricted to shallow redshift surveys, arbitrarily deep
samples can be dealt with as well. Therefore, our methods are useful in
constraining the geometry of the universe and the dark energy component, as
well as the power spectrum of galaxies, since ongoing and near-future galaxy
surveys probe the universe at intermediate to deep redshifts, z ~ 0.2--5. In
addition to the detailed methods to compute the correlation matrix in
3-dimensional redshift surveys, methods to calculate the matrix in
2-dimensional projected samples are also provided. Prospects of applying our
methods to likelihood estimation of the cosmological parameters are discussed.
| [
{
"version": "v1",
"created": "Tue, 13 Jan 2004 21:00:09 GMT"
}
] | 2009-11-10T00:00:00 | [
[
"Matsubara",
"Takahiko",
""
],
[
"Szalay",
"Alexander S.",
""
],
[
"Pope",
"Adrian C.",
""
]
] | |
1411.1833 | Tiefeng Jiang | Tiefeng Jiang and Yongcheng Qi | Spectral Radii of Large Non-Hermitian Random Matrices | 36 pages | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the independence structure of points following a determinantal point
process, we study the radii of the spherical ensemble, the truncation of the
circular unitary ensemble and the product ensemble with parameter n and k. The
limiting distributions of the three radii are obtained. They are not the
Tracy-Widom distribution. In particular, for the product ensemble, we show that
the limiting distribution has a transition phenomenon: when k/n -> 0, k/n -> a
in (0,infty) and k/n -> infty, the liming distribution is the Gumbel
distribution, a new distribution $\mu$ and the logarithmic normal distribution,
respectively. The cumulative distribution function (cdf) of mu is the infinite
product of some normal distribution functions. Another new distribution nu is
also obtained for the spherical ensemble such that the cdf of nu is the
infinite product of the cdfs of some Poisson-distributed random variables.
| [
{
"version": "v1",
"created": "Fri, 7 Nov 2014 05:38:05 GMT"
}
] | 2014-11-10T00:00:00 | [
[
"Jiang",
"Tiefeng",
""
],
[
"Qi",
"Yongcheng",
""
]
] | |
2210.07588 | Yang Jiao | Yang Jiao, Kai Yang, Dongjin Song | Distributed Distributionally Robust Optimization with Non-Convex
Objectives | Accepted to NeurIPS2022 | null | null | null | cs.LG cs.AI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Distributionally Robust Optimization (DRO), which aims to find an optimal
decision that minimizes the worst case cost over the ambiguity set of
probability distribution, has been widely applied in diverse applications,
e.g., network behavior analysis, risk management, etc. However, existing DRO
techniques face three key challenges: 1) how to deal with the asynchronous
updating in a distributed environment; 2) how to leverage the prior
distribution effectively; 3) how to properly adjust the degree of robustness
according to different scenarios. To this end, we propose an asynchronous
distributed algorithm, named Asynchronous Single-looP alternatIve gRadient
projEction (ASPIRE) algorithm with the itErative Active SEt method (EASE) to
tackle the distributed distributionally robust optimization (DDRO) problem.
Furthermore, a new uncertainty set, i.e., constrained D-norm uncertainty set,
is developed to effectively leverage the prior distribution and flexibly
control the degree of robustness. Finally, our theoretical analysis elucidates
that the proposed algorithm is guaranteed to converge and the iteration
complexity is also analyzed. Extensive empirical studies on real-world datasets
demonstrate that the proposed method can not only achieve fast convergence, and
remain robust against data heterogeneity as well as malicious attacks, but also
tradeoff robustness with performance.
| [
{
"version": "v1",
"created": "Fri, 14 Oct 2022 07:39:13 GMT"
},
{
"version": "v2",
"created": "Sat, 17 Dec 2022 08:55:00 GMT"
}
] | 2022-12-20T00:00:00 | [
[
"Jiao",
"Yang",
""
],
[
"Yang",
"Kai",
""
],
[
"Song",
"Dongjin",
""
]
] |
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