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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
6,200 |
1805.02875
|
Mark Dieckmann
|
M E Dieckmann and Q Moreno and D Doria and L Romagnani and G Sarri and
D Folini and R Walder and A Bret and E d'Humieres and M Borghesi
|
Expansion of a radially symmetric blast shell into a uniformly
magnetized plasma
|
10 pages and 11 figures. Accepted for publication in the Physics of
Plasmas
| null |
10.1063/1.5024851
| null |
physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The expansion of a thermal pressure-driven radial blast shell into a dilute
ambient plasma is examined with two-dimensional PIC simulations. The purpose is
to determine if laminar shocks form in a collisionless plasma that resemble
their magnetohydrodynamic counterparts. The ambient plasma is composed of
electrons with the temperature 2 keV and cool fully ionized nitrogen ions. It
is permeated by a spatially uniform magnetic field. A forward shock forms
between the shocked ambient medium and the pristine ambient medium, which
changes from an ion acoustic one through a slow magnetosonic one to a fast
magnetosonic shock with increasing shock propagation angles relative to the
magnetic field. The slow magnetosonic shock that propagates obliquely to the
magnetic field changes into a tangential discontinuity for a perpendicular
propagation direction, which is in line with the magnetohydrodynamic model. The
expulsion of the magnetic field by the expanding blast shell triggers an
electron-cyclotron drift instability.
|
[{'version': 'v1', 'created': 'Tue, 8 May 2018 07:53:56 GMT'}]
|
2018-05-30
|
[array(['Dieckmann', 'M E', ''], dtype=object)
array(['Moreno', 'Q', ''], dtype=object)
array(['Doria', 'D', ''], dtype=object)
array(['Romagnani', 'L', ''], dtype=object)
array(['Sarri', 'G', ''], dtype=object)
array(['Folini', 'D', ''], dtype=object)
array(['Walder', 'R', ''], dtype=object)
array(['Bret', 'A', ''], dtype=object)
array(["d'Humieres", 'E', ''], dtype=object)
array(['Borghesi', 'M', ''], dtype=object)]
|
6,201 |
1202.3473
|
Jaideep Ray
|
Jaideep Ray, Ali Pinar and C. Seshadhri
|
Are we there yet? When to stop a Markov chain while generating random
graphs
|
12 pages, 4 figures, 1 table. Submitted to 9th Workshop on Algorithms
and Models for the Web Graph, Dalhousie University in Halifax, Nova Scotia,
Canada, June 22-23, 2012, http://www.mathstat.dal.ca/~mominis/WAW2012/
| null | null |
SAND2012-1169C
|
cs.SI physics.data-an physics.soc-ph
|
http://creativecommons.org/licenses/publicdomain/
|
Markov chains are a convenient means of generating realizations of networks,
since they require little more than a procedure for rewiring edges. If a
rewiring procedure exists for generating new graphs with specified statistical
properties, then a Markov chain sampler can generate an ensemble of graphs with
prescribed characteristics. However, successive graphs in a Markov chain cannot
be used when one desires independent draws from the distribution of graphs; the
realizations are correlated. Consequently, one runs a Markov chain for N
iterations before accepting the realization as an independent sample. In this
work, we devise two methods for calculating N. They are both based on the
binary "time-series" denoting the occurrence/non-occurrence of edge (u, v)
between vertices u and v in the Markov chain of graphs generated by the
sampler. They differ in their underlying assumptions. We test them on the
generation of graphs with a prescribed joint degree distribution. We find the N
proportional |E|, where |E| is the number of edges in the graph. The two
methods are compared by sampling on real, sparse graphs with 10^3 - 10^4
vertices.
|
[{'version': 'v1', 'created': 'Wed, 15 Feb 2012 23:38:06 GMT'}]
|
2012-02-17
|
[array(['Ray', 'Jaideep', ''], dtype=object)
array(['Pinar', 'Ali', ''], dtype=object)
array(['Seshadhri', 'C.', ''], dtype=object)]
|
6,202 |
1610.08296
|
Wei-Hong Liang
|
Wei-Hong Liang, Melahat Bayar, Eulogio Oset
|
$\Lambda_b \to \pi^- (D_s^-) \Lambda_c(2595),~\pi^- (D_s^-)
\Lambda_c(2625)$ decays and $DN,~D^*N$ molecular components
|
9 pages, 3 figures; V2: new references added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
From the perspective that the $\Lambda_c(2595)$ and $\Lambda_c(2625)$ are
dynamically generated resonances from the $DN,~D^*N$ interaction and coupled
channels, we have evaluated the rates for $\Lambda_b \to \pi^- \Lambda_c(2595)$
and $\Lambda_b \to \pi^- \Lambda_c(2625)$ up to a global unknown factor that
allows us to calculate the ratio of rates and compare with experiment, where
good agreement is found. Similarly, we can also make predictions for the ratio
of rates of the, yet unknown, decays of $\Lambda_b \to D_s^- \Lambda_c(2595)$
and $\Lambda_b \to D_s^- \Lambda_c(2625)$ and make estimates for their
individual branching fractions.
|
[{'version': 'v1', 'created': 'Wed, 26 Oct 2016 12:24:36 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Nov 2016 03:49:20 GMT'}]
|
2016-11-15
|
[array(['Liang', 'Wei-Hong', ''], dtype=object)
array(['Bayar', 'Melahat', ''], dtype=object)
array(['Oset', 'Eulogio', ''], dtype=object)]
|
6,203 |
1802.02852
|
Emmi Jokinen
|
Emmi Jokinen, Markus Heinonen, Harri L\"ahdesm\"aki
|
mGPfusion: Predicting protein stability changes with Gaussian process
kernel learning and data fusion
| null | null | null | null |
stat.ML q-bio.BM q-bio.QM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Proteins are commonly used by biochemical industry for numerous processes.
Refining these proteins' properties via mutations causes stability effects as
well. Accurate computational method to predict how mutations affect protein
stability are necessary to facilitate efficient protein design. However,
accuracy of predictive models is ultimately constrained by the limited
availability of experimental data. We have developed mGPfusion, a novel
Gaussian process (GP) method for predicting protein's stability changes upon
single and multiple mutations. This method complements the limited experimental
data with large amounts of molecular simulation data. We introduce a Bayesian
data fusion model that re-calibrates the experimental and in silico data
sources and then learns a predictive GP model from the combined data. Our
protein-specific model requires experimental data only regarding the protein of
interest and performs well even with few experimental measurements. The
mGPfusion models proteins by contact maps and infers the stability effects
caused by mutations with a mixture of graph kernels. Our results show that
mGPfusion outperforms state-of-the-art methods in predicting protein stability
on a dataset of 15 different proteins and that incorporating molecular
simulation data improves the model learning and prediction accuracy.
|
[{'version': 'v1', 'created': 'Thu, 8 Feb 2018 13:41:37 GMT'}
{'version': 'v2', 'created': 'Fri, 23 Mar 2018 08:20:12 GMT'}]
|
2018-03-26
|
[array(['Jokinen', 'Emmi', ''], dtype=object)
array(['Heinonen', 'Markus', ''], dtype=object)
array(['Lähdesmäki', 'Harri', ''], dtype=object)]
|
6,204 |
1407.5125
|
Clara Cuesta
|
C. Cuesta, J. Amar\'e, S. Cebri\'an, E. Garc\'ia, C. Ginestra, M.
Mart\'inez, M. A. Oliv\'an, Y. Ortigoza, A. Ortiz de Sol\'orzano, C. Pobes,
J. Puimed\'on, M. L. Sarsa, J. A. Villar, P. Villar
|
Bulk NaI(Tl) scintillation low energy events selection with the ANAIS-0
module
|
13 pages, 22 figures
|
European Physical Journal C 74 (2014) 3150
|
10.1140/epjc/s10052-014-3150-6
| null |
astro-ph.IM physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter particles scattering off some target nuclei are expected to
deposit very small energies in form of nuclear recoils (below 100 keV). Because
of the low scintillation efficiency for nuclear recoils vs. electron recoils,
in most of the scintillating targets considered in the search for dark matter,
the region below 10 keVee concentrates most of the expected dark matter signal.
For this reason, very low energy threshold (at or below 2 keVee) and very low
background are required. This is the case of the ANAIS (Annual modulation with
NaI Scintillators) experiment. A good knowledge of the detector response
function for real scintillation events, a good characterization of other
anomalous or noise event populations contributing in that energy range, and the
development of convenient filtering procedures for the latter are mandatory to
achieve the required low background at such a low energy. In this work we will
present the specific protocols developed to select bulk scintillation events in
NaI(Tl), and its application to data obtained with the ANAIS-0 prototype.
Slight differences in time constants are expected in scintillation pulses
produced by nuclear or electron recoils in NaI(Tl), so in order to analyze the
effect of these filtering procedures in the case of a recoil population
attributable to dark matter, data from a neutron calibration have been used.
|
[{'version': 'v1', 'created': 'Fri, 18 Jul 2014 22:18:57 GMT'}
{'version': 'v2', 'created': 'Thu, 18 Dec 2014 00:41:34 GMT'}]
|
2014-12-19
|
[array(['Cuesta', 'C.', ''], dtype=object)
array(['Amaré', 'J.', ''], dtype=object)
array(['Cebrián', 'S.', ''], dtype=object)
array(['García', 'E.', ''], dtype=object)
array(['Ginestra', 'C.', ''], dtype=object)
array(['Martínez', 'M.', ''], dtype=object)
array(['Oliván', 'M. A.', ''], dtype=object)
array(['Ortigoza', 'Y.', ''], dtype=object)
array(['de Solórzano', 'A. Ortiz', ''], dtype=object)
array(['Pobes', 'C.', ''], dtype=object)
array(['Puimedón', 'J.', ''], dtype=object)
array(['Sarsa', 'M. L.', ''], dtype=object)
array(['Villar', 'J. A.', ''], dtype=object)
array(['Villar', 'P.', ''], dtype=object)]
|
6,205 |
1407.1921
|
Donald Hylton White
|
D. H. White, S. K. Ruddell and M. D. Hoogerland
|
Phase Noise in the Delta Kicked Rotor: From Quantum to Classical
|
18 pages, 12 figures
|
D H White et al 2014 New J. Phys. 16 113039
|
10.1088/1367-2630/16/11/113039
| null |
quant-ph nlin.CD physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We experimentally investigate the effects of phase noise on the resonant and
non-resonant dynamics of the atom-optics kicked rotor. Employing sinusoidal
phase modulation at various frequencies, resonances are found corresponding to
periodic phase shifts, resulting in the effective transformation of quantum
anti-resonances into resonances and vice-versa. The stability of the resonance
is analysed, with the aid of experiments, epsilon-classical theory and
numerical simulations, and is found to be surprisingly robust against phase
noise. Finally we look into the effects of phase noise on dynamical
localization and discuss the destruction of the localization in terms of
decoherence.
|
[{'version': 'v1', 'created': 'Tue, 8 Jul 2014 01:15:41 GMT'}
{'version': 'v2', 'created': 'Wed, 19 Nov 2014 21:22:06 GMT'}]
|
2014-11-21
|
[array(['White', 'D. H.', ''], dtype=object)
array(['Ruddell', 'S. K.', ''], dtype=object)
array(['Hoogerland', 'M. D.', ''], dtype=object)]
|
6,206 |
1102.1281
|
Siavash Ghabezloo
|
Siavash Ghabezloo (NAVIER)
|
Micromechanics analysis of thermal expansion and thermal pressurization
of a hardened cement paste
| null |
Cement and Concrete Research (2011)
|
10.1016/j.cemconres.2011.01.023
| null |
physics.class-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The results of a macro-scale experimental study of the effect of heating on a
fluid-saturated hardened cement paste are analysed using a multi-scale
homogenization model. The analysis of the experimental results revealed that
the thermal expansion coefficient of the cement paste pore fluid is anomalously
higher than the one of pure bulk water. The micromechanics model is calibrated
using the results of drained and undrained heating tests and permits the
extrapolation of the experimentally evaluated thermal expansion and thermal
pressurization parameters to cement pastes with different water-to-cement
ratios. It permits also to calculate the pore volume thermal expansion
coefficient f a which is difficult to evaluate experimentally. The anomalous
pore fluid thermal expansion is also analysed using the micromechanics model.
|
[{'version': 'v1', 'created': 'Mon, 7 Feb 2011 11:48:25 GMT'}]
|
2011-02-08
|
[array(['Ghabezloo', 'Siavash', '', 'NAVIER'], dtype=object)]
|
6,207 |
physics/0307109
|
Lawrence R. Pratt
|
Henry S. Ashbaugh and Lawrence R. Pratt
|
Scaled-Particle Theory and the Length-scales Involved in Hydrophobic
Hydration of Aqueous Biomolecular Assemblies
|
19 pages, 14 figures, one figure added, submitted to Rev. Mod. Phys
| null | null |
LA-UR-03-2144
|
physics.bio-ph physics.chem-ph
| null |
Hydrophobic hydration plays a crucial role in self-assembly processes over
multiple length-scales, but the extrapolation of molecular-scale models to
larger length-scale hydration phenomena is sometimes not warranted.
Scaled-particle theories are based upon an interpolative view of that issue. We
revisit the scaled-particle theory proposed thirty years ago by Stillinger,
adopt a practical generalization, and consider the implications for hydrophobic
hydration in light of our current understanding. The generalization is based
upon identifying a molecular length, implicit in previous applications of
scaled-particle models, that provides an effective radius for joining
microscopic and macroscopic descriptions. We demonstrate that the generalized
theory correctly reproduces many of the anomalous thermodynamic properties of
hydrophobic hydration for molecularly sized solutes, including solubility
minima and entropy convergence, successfully interpolates between the
microscopic and macroscopic extremes, and provides new insights into the
underlying molecular mechanisms. The results are discussed in terms of
length-scales associated with component phenomena; in particular we first
discuss the micro-macroscopic joining radius identified by the theory, then we
discuss in turn the Tolman length that leads to an analogous length describing
curvature corrections of a surface area model of hydrophobic hydration free
energies, and the length-scales on which entropy convergence of hydration free
energies are expected.
|
[{'version': 'v1', 'created': 'Tue, 22 Jul 2003 18:50:36 GMT'}
{'version': 'v2', 'created': 'Sat, 15 Jan 2005 19:24:50 GMT'}]
|
2007-05-23
|
[array(['Ashbaugh', 'Henry S.', ''], dtype=object)
array(['Pratt', 'Lawrence R.', ''], dtype=object)]
|
6,208 |
1409.3958
|
Pei Junchen
|
Yi Zhu and Junchen Pei
|
Microscopic description of neutron emission rates in compound nuclei
|
6 pages, 5 figures, revised and accepted for PRC
| null |
10.1103/PhysRevC.90.054316
| null |
nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The neutron emission rates in thermal excited nuclei are conventionally
described by statistical models with a phenomenological level density parameter
that depends on excitation energies, deformations and mass regions. In the
microscopic view of hot nuclei, the neutron emission rates can be determined by
the external neutron gas densities without any free parameters. Therefore the
microscopic description of thermal neutron emissions is desirable that can
impact several understandings such as survival probabilities of superheavy
compound nuclei and neutron emissivity in reactors.
To describe the neutron emission rates microscopically, the external thermal
neutron gases are self-consistently obtained based on the Finite-Temperature
Hartree-Fock-Bogoliubov (FT-HFB) approach. The results are compared with the
statistical model to explore the connections between the FT-HFB approach and
the statistical model.
The Skyrme FT-HFB equation is solved by HFB-AX in deformed coordinate spaces.
Based on the FT-HFB approach, the thermal properties and external neutron gas
are properly described with the self-consistent gas substraction procedure.
Then neutron emission rates can be obtained based on the densities of external
neutron gases.
The thermal statistical properties of $^{238}$U and $^{258}$U are studied in
detail in terms of excitation energies. The thermal neutron emission rates in
$^{238, 258}$U and superheavy compound nuclei $_{112}^{278}$Cn and
$_{114}^{292}$Fl are calculated, which agree well with the statistical model by
adopting an excitation-energy-dependent level density parameter.
The coordinate-space FT-HFB approach can provide reliable microscopic
descriptions of neutron emission rates in hot nuclei, as well as microscopic
constraints on the excitation energy dependence of level density parameters for
statistical models.
|
[{'version': 'v1', 'created': 'Sat, 13 Sep 2014 15:02:35 GMT'}
{'version': 'v2', 'created': 'Sun, 2 Nov 2014 09:59:05 GMT'}]
|
2015-06-22
|
[array(['Zhu', 'Yi', ''], dtype=object)
array(['Pei', 'Junchen', ''], dtype=object)]
|
6,209 |
1905.11425
|
Zaiwei Chen
|
Zaiwei Chen, Sheng Zhang, Thinh T. Doan, John-Paul Clarke, Siva Theja
Maguluri
|
Finite-Sample Analysis of Nonlinear Stochastic Approximation with
Applications in Reinforcement Learning
| null | null | null | null |
math.OC cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
Motivated by applications in reinforcement learning (RL), we study a
nonlinear stochastic approximation (SA) algorithm under Markovian noise, and
establish its finite-sample convergence bounds under various stepsizes.
Specifically, we show that when using constant stepsize (i.e., $\alpha_k\equiv
\alpha$), the algorithm achieves exponential fast convergence to a neighborhood
(with radius $O(\alpha\log(1/\alpha))$) around the desired limit point. When
using diminishing stepsizes with appropriate decay rate, the algorithm
converges with rate $O(\log(k)/k)$. Our proof is based on Lyapunov drift
arguments, and to handle the Markovian noise, we exploit the fast mixing of the
underlying Markov chain.
To demonstrate the generality of our theoretical results on Markovian SA, we
use it to derive the finite-sample bounds of the popular $Q$-learning with
linear function approximation algorithm, under a condition on the behavior
policy. Importantly, we do not need to make the assumption that the samples are
i.i.d., and do not require an artificial projection step in the algorithm to
maintain the boundedness of the iterates. Numerical simulations corroborate our
theoretical results.
|
[{'version': 'v1', 'created': 'Mon, 27 May 2019 18:01:59 GMT'}
{'version': 'v2', 'created': 'Sat, 7 Sep 2019 16:19:34 GMT'}
{'version': 'v3', 'created': 'Sun, 27 Oct 2019 21:57:09 GMT'}
{'version': 'v4', 'created': 'Mon, 6 Jul 2020 03:22:59 GMT'}
{'version': 'v5', 'created': 'Thu, 30 Jul 2020 00:56:28 GMT'}
{'version': 'v6', 'created': 'Fri, 9 Jul 2021 01:36:18 GMT'}
{'version': 'v7', 'created': 'Wed, 26 Jan 2022 05:25:41 GMT'}]
|
2022-01-27
|
[array(['Chen', 'Zaiwei', ''], dtype=object)
array(['Zhang', 'Sheng', ''], dtype=object)
array(['Doan', 'Thinh T.', ''], dtype=object)
array(['Clarke', 'John-Paul', ''], dtype=object)
array(['Maguluri', 'Siva Theja', ''], dtype=object)]
|
6,210 |
1403.5237
|
Narciso (Txitxo) Benitez
|
N. Benitez, R. Dupke, M. Moles, L. Sodre, J. Cenarro, A. Marin-Franch,
K. Taylor, D. Cristobal, A. Fernandez-Soto, C. Mendes de Oliveira, J.
Cepa-Nogue, L.R. Abramo, J.S. Alcaniz, R. Overzier, C. Hernandez-Monteagudo,
E. J. Alfaro, A. Kanaan, J. M. Carvano, R.R.R. Reis, E. Martinez Gonzalez, B.
Ascaso, F. Ballesteros, H.S. Xavier, J. Varela, A. Ederoclite, H. Vazquez
Ramio, T. Broadhurst, E. Cypriano, R. Angulo, J. M. Diego, A. Zandivarez, E.
Diaz, P. Melchior, K. Umetsu, P. F. Spinelli, A. Zitrin, D. Coe, G. Yepes, P.
Vielva, V. Sahni, A. Marcos-Caballero, F. Shu Kitaura, A. L. Maroto, M.
Masip, S. Tsujikawa, S. Carneiro, J. Gonzalez Nuevo, G. C. Carvalho, M. J.
Reboucas, J. C. Carvalho, E. Abdalla, A. Bernui, C. Pigozzo, E.G.M. Ferreira,
N. Chandrachani Devi, C.A.P. Bengaly Jr., M. Campista, A. Amorim, N. V.
Asari, A. Bongiovanni, S. Bonoli, G. Bruzual, N. Cardiel, A. Cava, R. Cid
Fernandes, P. Coelho, A. Cortesi, R. G. Delgado, L. Diaz Garcia, J. M. R.
Espinosa, E. Galliano, J. I. Gonzalez-Serrano, J. Falcon-Barroso, J. Fritz,
C. Fernandes, J. Gorgas, C. Hoyos, Y. Jimenez-Teja, J. A. Lopez-Aguerri, C.
Lopez-San Juan, A. Mateus, A. Molino, P. Novais, A. OMill, I. Oteo, P.G.
Perez-Gonzalez, B. Poggianti, R. Proctor, E. Ricciardelli, P.
Sanchez-Blazquez, T. Storchi-Bergmann, E. Telles, W. Schoennell, N. Trujillo,
A. Vazdekis, K. Viironen, S. Daflon, T. Aparicio-Villegas, D. Rocha, T.
Ribeiro, M. Borges, S. L. Martins, W. Marcolino, D. Martinez-Delgado, M.A.
Perez-Torres, B.B.Siffert, M.O.Calvao, M.Sako, R.Kessler, A. Alvarez-Candal,
M. De Pra, F.Roig, D.Lazzaro, J.Gorosabel, R.Lopes de Oliveira,
G.B.Lima-Neto, J.Irwin, J.F.Liu, E. Alvarez, I.Balmes, S.Chueca, M.V.
Costa-Duarte, A.A.da Costa, M.L.L. Dantas, A.Y.Diaz, J. Fabregat, F. Ferrari,
B.Gavela, S. G. Gracia, N. Gruel, J. L. L. Gutierrez, R. Guzman, J. D.
Hernandez-Fernandez, D. Herranz, L. Hurtado-Gil, F. Jablonsky, R. Laporte,
L.L. Le Tiran, J Licandro, M. Lima, E. Martin, V. Martinez, J. J. C. Montero,
P. Penteado, C.B. Pereira, V. Peris, V. Quilis, M. Sanchez-Portal, A. C.
Soja, E. Solano, J. Torra and L. Valdivielso
|
J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical
Survey
|
215 pages, 70 figures. J-PAS "Red Book", containing a description of
the technical aspects of the Survey and its main scientific goals
| null | null | null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
(J-PAS) is a narrow band, very wide field Cosmological Survey to be carried out
from the Javalambre Observatory in Spain with a purpose-built, dedicated 2.5m
telescope and a 4.7 sq.deg. camera with 1.2Gpix. Starting in late 2015, J-PAS
will observe 8500sq.deg. of Northern Sky and measure $0.003(1+z)$ photo-z for
$9\times10^7$ LRG and ELG galaxies plus several million QSOs, sampling an
effective volume of $\sim 14$ Gpc$^3$ up to $z=1.3$ and becoming the first
radial BAO experiment to reach Stage IV. J-PAS will detect $7\times 10^5$
galaxy clusters and groups, setting constrains on Dark Energy which rival those
obtained from its BAO measurements. Thanks to the superb characteristics of the
site (seeing ~0.7 arcsec), J-PAS is expected to obtain a deep, sub-arcsec image
of the Northern sky, which combined with its unique photo-z precision will
produce one of the most powerful cosmological lensing surveys before the
arrival of Euclid. J-PAS unprecedented spectral time domain information will
enable a self-contained SN survey that, without the need for external
spectroscopic follow-up, will detect, classify and measure $\sigma_z\sim 0.5\%$
redshifts for $\sim 4000$ SNeIa and $\sim 900$ core-collapse SNe. The key to
the J-PAS potential is its innovative approach: a contiguous system of 54
filters with $145\AA$ width, placed $100\AA$ apart over a multi-degree FoV is a
powerful "redshift machine", with the survey speed of a 4000 multiplexing low
resolution spectrograph, but many times cheaper and much faster to build. The
J-PAS camera is equivalent to a 4.7 sq.deg. "IFU" and it will produce a
time-resolved, 3D image of the Northern Sky with a very wide range of
Astrophysical applications in Galaxy Evolution, the nearby Universe and the
study of resolved stellar populations.
|
[{'version': 'v1', 'created': 'Thu, 20 Mar 2014 19:19:38 GMT'}]
|
2014-03-21
|
[array(['Benitez', 'N.', ''], dtype=object)
array(['Dupke', 'R.', ''], dtype=object)
array(['Moles', 'M.', ''], dtype=object)
array(['Sodre', 'L.', ''], dtype=object)
array(['Cenarro', 'J.', ''], dtype=object)
array(['Marin-Franch', 'A.', ''], dtype=object)
array(['Taylor', 'K.', ''], dtype=object)
array(['Cristobal', 'D.', ''], dtype=object)
array(['Fernandez-Soto', 'A.', ''], dtype=object)
array(['de Oliveira', 'C. Mendes', ''], dtype=object)
array(['Cepa-Nogue', 'J.', ''], dtype=object)
array(['Abramo', 'L. R.', ''], dtype=object)
array(['Alcaniz', 'J. S.', ''], dtype=object)
array(['Overzier', 'R.', ''], dtype=object)
array(['Hernandez-Monteagudo', 'C.', ''], dtype=object)
array(['Alfaro', 'E. J.', ''], dtype=object)
array(['Kanaan', 'A.', ''], dtype=object)
array(['Carvano', 'J. M.', ''], dtype=object)
array(['Reis', 'R. R. R.', ''], dtype=object)
array(['Gonzalez', 'E. Martinez', ''], dtype=object)
array(['Ascaso', 'B.', ''], dtype=object)
array(['Ballesteros', 'F.', ''], dtype=object)
array(['Xavier', 'H. S.', ''], dtype=object)
array(['Varela', 'J.', ''], dtype=object)
array(['Ederoclite', 'A.', ''], dtype=object)
array(['Ramio', 'H. Vazquez', ''], dtype=object)
array(['Broadhurst', 'T.', ''], dtype=object)
array(['Cypriano', 'E.', ''], dtype=object)
array(['Angulo', 'R.', ''], dtype=object)
array(['Diego', 'J. M.', ''], dtype=object)
array(['Zandivarez', 'A.', ''], dtype=object)
array(['Diaz', 'E.', ''], dtype=object)
array(['Melchior', 'P.', ''], dtype=object)
array(['Umetsu', 'K.', ''], dtype=object)
array(['Spinelli', 'P. F.', ''], dtype=object)
array(['Zitrin', 'A.', ''], dtype=object)
array(['Coe', 'D.', ''], dtype=object)
array(['Yepes', 'G.', ''], dtype=object)
array(['Vielva', 'P.', ''], dtype=object)
array(['Sahni', 'V.', ''], dtype=object)
array(['Marcos-Caballero', 'A.', ''], dtype=object)
array(['Kitaura', 'F. Shu', ''], dtype=object)
array(['Maroto', 'A. L.', ''], dtype=object)
array(['Masip', 'M.', ''], dtype=object)
array(['Tsujikawa', 'S.', ''], dtype=object)
array(['Carneiro', 'S.', ''], dtype=object)
array(['Nuevo', 'J. Gonzalez', ''], dtype=object)
array(['Carvalho', 'G. C.', ''], dtype=object)
array(['Reboucas', 'M. J.', ''], dtype=object)
array(['Carvalho', 'J. C.', ''], dtype=object)
array(['Abdalla', 'E.', ''], dtype=object)
array(['Bernui', 'A.', ''], dtype=object)
array(['Pigozzo', 'C.', ''], dtype=object)
array(['Ferreira', 'E. G. M.', ''], dtype=object)
array(['Devi', 'N. Chandrachani', ''], dtype=object)
array(['Bengaly', 'C. A. P.', 'Jr.'], dtype=object)
array(['Campista', 'M.', ''], dtype=object)
array(['Amorim', 'A.', ''], dtype=object)
array(['Asari', 'N. V.', ''], dtype=object)
array(['Bongiovanni', 'A.', ''], dtype=object)
array(['Bonoli', 'S.', ''], dtype=object)
array(['Bruzual', 'G.', ''], dtype=object)
array(['Cardiel', 'N.', ''], dtype=object)
array(['Cava', 'A.', ''], dtype=object)
array(['Fernandes', 'R. Cid', ''], dtype=object)
array(['Coelho', 'P.', ''], dtype=object)
array(['Cortesi', 'A.', ''], dtype=object)
array(['Delgado', 'R. G.', ''], dtype=object)
array(['Garcia', 'L. Diaz', ''], dtype=object)
array(['Espinosa', 'J. M. R.', ''], dtype=object)
array(['Galliano', 'E.', ''], dtype=object)
array(['Gonzalez-Serrano', 'J. I.', ''], dtype=object)
array(['Falcon-Barroso', 'J.', ''], dtype=object)
array(['Fritz', 'J.', ''], dtype=object)
array(['Fernandes', 'C.', ''], dtype=object)
array(['Gorgas', 'J.', ''], dtype=object)
array(['Hoyos', 'C.', ''], dtype=object)
array(['Jimenez-Teja', 'Y.', ''], dtype=object)
array(['Lopez-Aguerri', 'J. A.', ''], dtype=object)
array(['Juan', 'C. Lopez-San', ''], dtype=object)
array(['Mateus', 'A.', ''], dtype=object)
array(['Molino', 'A.', ''], dtype=object)
array(['Novais', 'P.', ''], dtype=object)
array(['OMill', 'A.', ''], dtype=object)
array(['Oteo', 'I.', ''], dtype=object)
array(['Perez-Gonzalez', 'P. G.', ''], dtype=object)
array(['Poggianti', 'B.', ''], dtype=object)
array(['Proctor', 'R.', ''], dtype=object)
array(['Ricciardelli', 'E.', ''], dtype=object)
array(['Sanchez-Blazquez', 'P.', ''], dtype=object)
array(['Storchi-Bergmann', 'T.', ''], dtype=object)
array(['Telles', 'E.', ''], dtype=object)
array(['Schoennell', 'W.', ''], dtype=object)
array(['Trujillo', 'N.', ''], dtype=object)
array(['Vazdekis', 'A.', ''], dtype=object)
array(['Viironen', 'K.', ''], dtype=object)
array(['Daflon', 'S.', ''], dtype=object)
array(['Aparicio-Villegas', 'T.', ''], dtype=object)
array(['Rocha', 'D.', ''], dtype=object)
array(['Ribeiro', 'T.', ''], dtype=object)
array(['Borges', 'M.', ''], dtype=object)
array(['Martins', 'S. L.', ''], dtype=object)
array(['Marcolino', 'W.', ''], dtype=object)
array(['Martinez-Delgado', 'D.', ''], dtype=object)
array(['Perez-Torres', 'M. A.', ''], dtype=object)
array(['Siffert', 'B. B.', ''], dtype=object)
array(['Calvao', 'M. O.', ''], dtype=object)
array(['Sako', 'M.', ''], dtype=object)
array(['Kessler', 'R.', ''], dtype=object)
array(['Alvarez-Candal', 'A.', ''], dtype=object)
array(['De Pra', 'M.', ''], dtype=object)
array(['Roig', 'F.', ''], dtype=object)
array(['Lazzaro', 'D.', ''], dtype=object)
array(['Gorosabel', 'J.', ''], dtype=object)
array(['de Oliveira', 'R. Lopes', ''], dtype=object)
array(['Lima-Neto', 'G. B.', ''], dtype=object)
array(['Irwin', 'J.', ''], dtype=object)
array(['Liu', 'J. F.', ''], dtype=object)
array(['Alvarez', 'E.', ''], dtype=object)
array(['Balmes', 'I.', ''], dtype=object)
array(['Chueca', 'S.', ''], dtype=object)
array(['Costa-Duarte', 'M. V.', ''], dtype=object)
array(['da Costa', 'A. A.', ''], dtype=object)
array(['Dantas', 'M. L. L.', ''], dtype=object)
array(['Diaz', 'A. Y.', ''], dtype=object)
array(['Fabregat', 'J.', ''], dtype=object)
array(['Ferrari', 'F.', ''], dtype=object)
array(['Gavela', 'B.', ''], dtype=object)
array(['Gracia', 'S. G.', ''], dtype=object)
array(['Gruel', 'N.', ''], dtype=object)
array(['Gutierrez', 'J. L. L.', ''], dtype=object)
array(['Guzman', 'R.', ''], dtype=object)
array(['Hernandez-Fernandez', 'J. D.', ''], dtype=object)
array(['Herranz', 'D.', ''], dtype=object)
array(['Hurtado-Gil', 'L.', ''], dtype=object)
array(['Jablonsky', 'F.', ''], dtype=object)
array(['Laporte', 'R.', ''], dtype=object)
array(['Tiran', 'L. L. Le', ''], dtype=object)
array(['Licandro', 'J', ''], dtype=object)
array(['Lima', 'M.', ''], dtype=object)
array(['Martin', 'E.', ''], dtype=object)
array(['Martinez', 'V.', ''], dtype=object)
array(['Montero', 'J. J. C.', ''], dtype=object)
array(['Penteado', 'P.', ''], dtype=object)
array(['Pereira', 'C. B.', ''], dtype=object)
array(['Peris', 'V.', ''], dtype=object)
array(['Quilis', 'V.', ''], dtype=object)
array(['Sanchez-Portal', 'M.', ''], dtype=object)
array(['Soja', 'A. C.', ''], dtype=object)
array(['Solano', 'E.', ''], dtype=object)
array(['Torra', 'J.', ''], dtype=object)
array(['Valdivielso', 'L.', ''], dtype=object)]
|
6,211 |
2003.10016
|
Berk Kaya
|
Berk Kaya, Radu Timofte
|
Self-Supervised 2D Image to 3D Shape Translation with Disentangled
Representations
|
Published in 2020 International Conference on 3D Vision (3DV)
| null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a framework to translate between 2D image views and 3D object
shapes. Recent progress in deep learning enabled us to learn structure-aware
representations from a scene. However, the existing literature assumes that
pairs of images and 3D shapes are available for training in full supervision.
In this paper, we propose SIST, a Self-supervised Image to Shape Translation
framework that fulfills three tasks: (i) reconstructing the 3D shape from a
single image; (ii) learning disentangled representations for shape, appearance
and viewpoint; and (iii) generating a realistic RGB image from these
independent factors. In contrast to the existing approaches, our method does
not require image-shape pairs for training. Instead, it uses unpaired image and
shape datasets from the same object class and jointly trains image generator
and shape reconstruction networks. Our translation method achieves promising
results, comparable in quantitative and qualitative terms to the
state-of-the-art achieved by fully-supervised methods.
|
[{'version': 'v1', 'created': 'Sun, 22 Mar 2020 22:44:02 GMT'}
{'version': 'v2', 'created': 'Fri, 29 Jan 2021 22:55:47 GMT'}]
|
2021-02-02
|
[array(['Kaya', 'Berk', ''], dtype=object)
array(['Timofte', 'Radu', ''], dtype=object)]
|
6,212 |
0901.4754
|
Robert Frank Carslaw Walters
|
L. de Francesco Albasini, N. Sabadini, R.F.C. Walters
|
An algebra of automata which includes both classical and quantum
entities
| null | null | null | null |
cs.LO math.CT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe an algebra for composing automata which includes both classical
and quantum entities and their communications. We illustrate by describing in
detail a quantum protocol.
|
[{'version': 'v1', 'created': 'Thu, 29 Jan 2009 19:28:13 GMT'}]
|
2009-01-30
|
[array(['Albasini', 'L. de Francesco', ''], dtype=object)
array(['Sabadini', 'N.', ''], dtype=object)
array(['Walters', 'R. F. C.', ''], dtype=object)]
|
6,213 |
2012.14454
|
Elias Vathias
|
Elias Vathias, Stathes Hadjiefthymiades
|
A Stock Options Metaphor for Content Delivery Networks
|
35 pages, 13 figures. Netnomics (2022)
|
NETNOMICS: Economic Research and Electronic Networking (2022)
|
10.1007/s11066-022-09153-7
| null |
cs.NI cs.CE
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
The concept of Stock Options is used to address the scarcity of resources,
not adequately addressed by the previous tools of our Prediction Mechanism.
Using a Predictive Reservation Scheme, network and disk resources are being
monitored through well-established techniques (Kernel Regression Estimators) in
a given time frame. Next, an Secondary Market mechanism significantly improves
the efficiency and robustness of our Predictive Reservation Scheme by allowing
the fast exchange of unused (remaining) resources between the Origin Servers
(CDN Clients). This exchange can happen, either by implementing socially
optimal practices or by allowing automatic electronic auctions at the end of
the day or at shorter time intervals. Finally, we further enhance our
Prediction Mechanism; Stock Options are obtained and exercised, depending on
the lack of resources at the end of day. As a result, Origin Servers may
acquire resources (if required) at a normal price. The effectiveness of our
mechanism further improves.
|
[{'version': 'v1', 'created': 'Mon, 28 Dec 2020 19:23:26 GMT'}]
|
2022-10-03
|
[array(['Vathias', 'Elias', ''], dtype=object)
array(['Hadjiefthymiades', 'Stathes', ''], dtype=object)]
|
6,214 |
hep-ph/9508314
| null |
S. Bar-Shalom (Technion), D. Atwood (SLAC), G. Eilam (Technion), R.R.
Mendel (Univ. of Western Ontario) and A. Soni (BNL)
|
Large Tree Level CP Violation in $e^+e^-\to t\bar{t}H^0$ in The Two
Higgs Doublet Model
|
UU encoded tar compressed tex file with postscript figures
|
Phys.Rev. D53 (1996) 1162-1167
|
10.1103/PhysRevD.53.1162
|
SLAC-PUB-95-6981
|
hep-ph
| null |
We find a large CP violation effect within the Two-Higgs-Doublet-Model for
the reaction $e^+e^-\to t\bar{t}H^0$ at future linear colliders. The
CP-asymmetry arises already at the tree level as a result of interference
between diagrams with $H^0$ emission from $t$ (and $\bar{t}$) and its emission
from a $Z^0$ and can be about 10--20\%. In the best case one needs a few
hundred $t\bar{t}H^0$ events to observe CP violation at the 3$\sigma$ level.
|
[{'version': 'v1', 'created': 'Wed, 16 Aug 1995 20:01:44 GMT'}]
|
2009-10-28
|
[array(['Bar-Shalom', 'S.', '', 'Technion'], dtype=object)
array(['Atwood', 'D.', '', 'SLAC'], dtype=object)
array(['Eilam', 'G.', '', 'Technion'], dtype=object)
array(['Mendel', 'R. R.', '', 'Univ. of Western Ontario'], dtype=object)
array(['Soni', 'A.', '', 'BNL'], dtype=object)]
|
6,215 |
2210.10856
|
Andrea Nava
|
Andrea Nava, Gabriele Campagnano, Pasquale Sodano, and Domenico
Giuliano
|
Lindblad master equation approach to the topological phase transition in
the disordered Su-Schrieffer-Heeger model
|
21 pages, 13 figures
|
Physical Review B 107, 035113 (2023)
|
10.1103/PhysRevB.107.035113
| null |
cond-mat.str-el cond-mat.dis-nn hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use the Lindblad equation method to investigate the onset of a mobility
edge and the topological phase transition in the disordered SSH chain connected
to two external baths in the large bias limit. From the scaling properties of
the nonequilibrium stationary current flowing across the system, we recover the
localization/delocalization in the disordered chain. To probe the topological
phase transition in the presence of disorder, we use the even-odd differential
occupancy as a mean to discriminate topologically trivial from topologically
nontrival phases in the out-of-equilibirum system. Eventually, we argue how to
generalize our method to other systems undergoing a topological phase
transition in the presence of disorder.
|
[{'version': 'v1', 'created': 'Wed, 19 Oct 2022 19:38:28 GMT'}
{'version': 'v2', 'created': 'Tue, 10 Jan 2023 18:37:11 GMT'}]
|
2023-01-11
|
[array(['Nava', 'Andrea', ''], dtype=object)
array(['Campagnano', 'Gabriele', ''], dtype=object)
array(['Sodano', 'Pasquale', ''], dtype=object)
array(['Giuliano', 'Domenico', ''], dtype=object)]
|
6,216 |
2202.11491
|
Armin Lederer
|
Armin Lederer, Mingmin Zhang, Samuel Tesfazgi, Sandra Hirche
|
Networked Online Learning for Control of Safety-Critical
Resource-Constrained Systems based on Gaussian Processes
| null | null | null | null |
eess.SY cs.LG cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Safety-critical technical systems operating in unknown environments require
the ability to quickly adapt their behavior, which can be achieved in control
by inferring a model online from the data stream generated during operation.
Gaussian process-based learning is particularly well suited for safety-critical
applications as it ensures bounded prediction errors. While there exist
computationally efficient approximations for online inference, these approaches
lack guarantees for the prediction error and have high memory requirements, and
are therefore not applicable to safety-critical systems with tight memory
constraints. In this work, we propose a novel networked online learning
approach based on Gaussian process regression, which addresses the issue of
limited local resources by employing remote data management in the cloud. Our
approach formally guarantees a bounded tracking error with high probability,
which is exploited to identify the most relevant data to achieve a certain
control performance. We further propose an effective data transmission scheme
between the local system and the cloud taking bandwidth limitations and time
delay of the transmission channel into account. The effectiveness of the
proposed method is successfully demonstrated in a simulation.
|
[{'version': 'v1', 'created': 'Wed, 23 Feb 2022 13:12:12 GMT'}]
|
2022-02-24
|
[array(['Lederer', 'Armin', ''], dtype=object)
array(['Zhang', 'Mingmin', ''], dtype=object)
array(['Tesfazgi', 'Samuel', ''], dtype=object)
array(['Hirche', 'Sandra', ''], dtype=object)]
|
6,217 |
1008.0169
|
Aran Garcia-Bellido
|
CDF and D0 collaborations, Aran Garcia-Bellido (for the collaboration)
|
Single top quark production at the Tevatron
|
Presented at 45th Rencontres de Moriond: QCD and High Energy
Interactions, La Thuile, Aosta Valley, Italy, 13-20 Mar 2010
| null | null |
FERMILAB-CONF-10-279-PPD
|
hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The observation of single top quark production by the CDF and D0
collaborations is one of the flagship measurements of the Run II of the
Tevatron. The Tevatron combined single top quark cross section is measured to
be: $\sigma(tb+X,~tqb+X)=2.8^{+0.6}_{-0.5}$~pb for a top quark mass of 170~GeV.
This result is in agreement with the standard model production of a single top
quark together with a jet in $\ppbar$ collisions at $\sqrt{s}$=1.96~TeV and
allows to measure the CKM matrix element $|V_{tb}|$ without assumptions about
the number of quark families. Other analyses involving tau leptons have been
performed, and several properties, like the top quark width or the polarization
have been measured.
|
[{'version': 'v1', 'created': 'Sun, 1 Aug 2010 12:10:15 GMT'}]
|
2019-08-14
|
[array(['CDF', '', '', 'for the collaboration'], dtype=object)
array(['collaborations', 'D0', '', 'for the collaboration'], dtype=object)
array(['Garcia-Bellido', 'Aran', '', 'for the collaboration'],
dtype=object) ]
|
6,218 |
2207.02041
|
Eugenia Boffo
|
E. Boffo
|
Particles in the superworldline and BRST
|
9 pages, for the proceedings to the 42th Winter School Geometry and
Physics, Srn\'i, 15-22 January 2022
| null | null | null |
hep-th
|
http://creativecommons.org/licenses/by-sa/4.0/
|
In this short note we discuss N-supersymmetric worldlines of relativistic
massless particles and review the known result that physical spin-N/2 fields
are in the first BRST cohomology group. For N=1,2,4 emphasis is given to
particular deformations of the BRST differential, that implement either a
covariant derivative for a gauge theory or a metric connection in the target
space seen by the particle. In the end, we comment about the possibility of
incorporating Ramond-Ramond fluxes in the background.
|
[{'version': 'v1', 'created': 'Tue, 5 Jul 2022 13:38:08 GMT'}]
|
2022-07-06
|
[array(['Boffo', 'E.', ''], dtype=object)]
|
6,219 |
2101.00601
|
Goran Mui\'c
|
Damir Miko\v{c} and Goran Mui\'c
|
On $m$--fold Holomorphic Differentials and Modular Forms
| null | null | null | null |
math.NT
|
http://creativecommons.org/publicdomain/zero/1.0/
|
Let $\Gamma$ be the Fuchsian group of the first kind. For an even integer
$m\ge 4$, we study $m/2$-holomorphic differentials in terms of space of
(holomorphic) cuspidal modular forms $S_m(\Gamma)$. We also give in depth study
of Wronskians of cuspidal modular forms and their divisors.
|
[{'version': 'v1', 'created': 'Sun, 3 Jan 2021 10:32:05 GMT'}]
|
2021-01-05
|
[array(['Mikoč', 'Damir', ''], dtype=object)
array(['Muić', 'Goran', ''], dtype=object)]
|
6,220 |
2207.13572
|
Hamid Jalalzai
|
Hamid Jalalzai, Elie Kadoche, R\'emi Leluc, Vincent Plassier
|
Membership Inference Attacks via Adversarial Examples
|
Trustworthy and Socially Responsible Machine Learning (TSRML 2022)
co-located with NeurIPS 2022
| null | null | null |
cs.LG cs.AI cs.CR stat.ML
|
http://creativecommons.org/licenses/by/4.0/
|
The raise of machine learning and deep learning led to significant
improvement in several domains. This change is supported by both the dramatic
rise in computation power and the collection of large datasets. Such massive
datasets often include personal data which can represent a threat to privacy.
Membership inference attacks are a novel direction of research which aims at
recovering training data used by a learning algorithm. In this paper, we
develop a mean to measure the leakage of training data leveraging a quantity
appearing as a proxy of the total variation of a trained model near its
training samples. We extend our work by providing a novel defense mechanism.
Our contributions are supported by empirical evidence through convincing
numerical experiments.
|
[{'version': 'v1', 'created': 'Wed, 27 Jul 2022 15:10:57 GMT'}
{'version': 'v2', 'created': 'Wed, 23 Nov 2022 00:53:30 GMT'}]
|
2022-11-24
|
[array(['Jalalzai', 'Hamid', ''], dtype=object)
array(['Kadoche', 'Elie', ''], dtype=object)
array(['Leluc', 'Rémi', ''], dtype=object)
array(['Plassier', 'Vincent', ''], dtype=object)]
|
6,221 |
astro-ph/0210288
|
Kim Page
|
K. A. Pounds (1), J. N. Reeves (1), K. L. Page (1), R. Edelson (2), G.
Matt (3) and G. C. Perola (3) ((1) University of Leicester, (2) UCLA, (3)
Universita di Roma Tre)
|
A simultaneous XMM-Newton and BeppoSAX observation of the archetypal
Broad Line Seyfert 1 galaxy NGC 5548
|
9 pages, 11 figures, accepted by MNRAS; minor changes to text and
figures
|
Mon.Not.Roy.Astron.Soc.341:953,2003
|
10.1046/j.1365-8711.2003.06470.x
| null |
astro-ph
| null |
We report the spectral analysis of a long XMM-Newton observation of the
well-studied, moderate luminosity Broad Line Seyfert 1 galaxy NGC 5548. The
source was at an historically average brightness and we find the hard (3-10
keV) spectrum can be well fitted by a power law of photon index gamma ~ 1.75,
together with reflection. The only feature in the hard X-ray spectrum is a
narrow emission line near 6.4 keV, with an equivalent width of ~ 60 eV. The
energy and strength of this line is consistent with fluorescence from `neutral'
iron distant from the central continuum source. We find no evidence for a broad
Fe K line, with an upper limit well below previous reports, suggesting the
inner accretion disc is now absent or highly ionised. The addition of
simultaneous BeppoSAX data allows the analysis to be extended to 200 keV,
yielding important constraints on the total reflection. Extrapolation of the
hard X-ray power law down to 0.3 keV shows a clear `soft excess' below ~ 0.7
keV. After due allowance for the effects of a complex warm absorber, measured
with the XMM-Newton RGS, we find the soft excess is better described as a
smooth upward curvature in the continuum flux below ~ 2 keV. The soft excess
can be modelled either by Comptonised thermal emission or by enhanced
reflection from the surface of a highly ionised disc.
|
[{'version': 'v1', 'created': 'Mon, 14 Oct 2002 08:47:21 GMT'}
{'version': 'v2', 'created': 'Mon, 3 Feb 2003 13:33:00 GMT'}]
|
2011-07-19
|
[array(['Pounds', 'K. A.', ''], dtype=object)
array(['Reeves', 'J. N.', ''], dtype=object)
array(['Page', 'K. L.', ''], dtype=object)
array(['Edelson', 'R.', ''], dtype=object)
array(['Matt', 'G.', ''], dtype=object)
array(['Perola', 'G. C.', ''], dtype=object)]
|
6,222 |
1409.4005
|
Robert Nowak
|
Mario A. T. Figueiredo and Robert D. Nowak
|
Sparse Estimation with Strongly Correlated Variables using Ordered
Weighted L1 Regularization
| null | null | null | null |
stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies ordered weighted L1 (OWL) norm regularization for sparse
estimation problems with strongly correlated variables. We prove sufficient
conditions for clustering based on the correlation/colinearity of variables
using the OWL norm, of which the so-called OSCAR is a particular case. Our
results extend previous ones for OSCAR in several ways: for the squared error
loss, our conditions hold for the more general OWL norm and under weaker
assumptions; we also establish clustering conditions for the absolute error
loss, which is, as far as we know, a novel result. Furthermore, we characterize
the statistical performance of OWL norm regularization for generative models in
which certain clusters of regression variables are strongly (even perfectly)
correlated, but variables in different clusters are uncorrelated. We show that
if the true p-dimensional signal generating the data involves only s of the
clusters, then O(s log p) samples suffice to accurately estimate the signal,
regardless of the number of coefficients within the clusters. The estimation of
s-sparse signals with completely independent variables requires just as many
measurements. In other words, using the OWL we pay no price (in terms of the
number of measurements) for the presence of strongly correlated variables.
|
[{'version': 'v1', 'created': 'Sun, 14 Sep 2014 02:33:16 GMT'}]
|
2014-09-16
|
[array(['Figueiredo', 'Mario A. T.', ''], dtype=object)
array(['Nowak', 'Robert D.', ''], dtype=object)]
|
6,223 |
1511.08511
|
Fernando Morales
|
Fernando A Morales and Luis C Aristiz\'abal
|
A Discussion on the Transmission Conditions for Saturated Fluid Flow
Through Porous Media With Fractal Microstructure
|
19 pages, 14 figures
|
Fractals: Complex Geometry, Patterns, and Scaling in Nature and
Society, 2019
|
10.1142/S0218348X1950036
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The present work is aimed to find suitable exchange conditions for saturated
fluid flow in a porous medium, when a fractal microstructure is embedded in the
porous matrix. Two different deterministic models are introduced and rigorously
analyzed. Also, numerical experiments for each of them are presented to verify
the theoretically predicted behavior of the phenomenon and some probabilistic
versions are explored numerically, to gain further insight on the phenomenon.
|
[{'version': 'v1', 'created': 'Thu, 26 Nov 2015 21:20:30 GMT'}
{'version': 'v2', 'created': 'Fri, 4 Mar 2016 18:10:43 GMT'}
{'version': 'v3', 'created': 'Sun, 29 May 2016 03:23:21 GMT'}
{'version': 'v4', 'created': 'Wed, 24 Oct 2018 15:37:34 GMT'}]
|
2020-08-21
|
[array(['Morales', 'Fernando A', ''], dtype=object)
array(['Aristizábal', 'Luis C', ''], dtype=object)]
|
6,224 |
1807.02953
|
Mohammad Masudur Rahman
|
Mohammad Masudur Rahman, Chanchal K. Roy and David Lo
|
RACK: Automatic API Recommendation using Crowdsourced Knowledge
|
The 23rd IEEE International Conference on Software Analysis,
Evolution, and Reengineering (SANER 2016), pp. 349--359, Osaka, Japan, March
2016
|
Proc. SANER 2016, pp. 349--359
|
10.1109/SANER.2016.80
| null |
cs.SE
|
http://creativecommons.org/licenses/by/4.0/
|
Traditional code search engines often do not perform well with natural
language queries since they mostly apply keyword matching. These engines thus
need carefully designed queries containing information about programming APIs
for code search. Unfortunately, existing studies suggest that preparing an
effective code search query is both challenging and time consuming for the
developers. In this paper, we propose a novel API recommendation
technique--RACK that recommends a list of relevant APIs for a natural language
query for code search by exploiting keyword-API associations from the
crowdsourced knowledge of Stack Overflow. We first motivate our technique using
an exploratory study with 11 core Java packages and 344K Java posts from Stack
Overflow. Experiments using 150 code search queries randomly chosen from three
Java tutorial sites show that our technique recommends correct API classes
within the top 10 results for about 79% of the queries which is highly
promising. Comparison with two variants of the state-of-the-art technique also
shows that RACK outperforms both of them not only in Top-K accuracy but also in
mean average precision and mean recall by a large margin.
|
[{'version': 'v1', 'created': 'Mon, 9 Jul 2018 06:13:53 GMT'}]
|
2018-07-10
|
[array(['Rahman', 'Mohammad Masudur', ''], dtype=object)
array(['Roy', 'Chanchal K.', ''], dtype=object)
array(['Lo', 'David', ''], dtype=object)]
|
6,225 |
1903.05970
|
Daniela Pugliese Dr
|
D. Pugliese and Z. Stuchl\'ik
|
RADs energetics and constraints on emerging tori collisions around
super-massive Kerr Black Holes
|
30 pages, 16 multi-panels figures, 2 tables
| null |
10.1140/epjc/s10052-019-6786-4
| null |
astro-ph.HE gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide constraints on possible configurations and interactions of two
coplanar tori orbiting a central Kerr black hole (BH), in dependence on its
dimensionless spin. The two-tori configurations can be directly linked to the
current models featuring the obscuration of galactic BH X-ray emission. The
emergence of each torus instability phases is discussed and tori collision has
been also investigated. The first simple evaluation of the center-of-mass
energy proves that collision-energy-efficiency increases with the dimensionless
BH spin. We explore the phenomenological aspects of the corotating and
counterrotating tori by analyzing properties of the orbiting toroidal
configurations related to the fluid enthalpy flux, the mass-flux, the
mass-accretion-rates, and the cusp luminosity in the two cases of corotating
and counterrotating fluids in dependence on the SMBH spin. The analysis
resulted ultimately in a comparative investigation of the properties of
corotating versus counterrotating tori, demonstrating that two accretion tori
can orbit around the central Kerr attractor only under very specific
conditions. Our results also demonstrate that the dynamics of the unstable
phases of these double tori systems is significant for the high energy
phenomena which could be observable in the X-ray emission and extremely
energetic phenomena in active galactic nuclei and quasar.
|
[{'version': 'v1', 'created': 'Thu, 14 Mar 2019 13:13:26 GMT'}]
|
2019-05-01
|
[array(['Pugliese', 'D.', ''], dtype=object)
array(['Stuchlík', 'Z.', ''], dtype=object)]
|
6,226 |
cond-mat/0103550
|
Tsung-han Lin
|
Yu Zhu, Qing-feng Sun, and Tsung-han Lin
|
Andreev bound states and $\pi $-junction transition in a superconductor
/ quantum-dot / superconductor system
|
18 pages, 8 figures, LateX
| null |
10.1088/0953-8984/13/39/307
| null |
cond-mat.mes-hall
| null |
We study Andreev bound states and $\pi $-junction transition in a
superconductor / quantum-dot / superconductor (S-QD-S) system by Green function
method. We derive an equation to describe the Andreev bound states in S-QD-S
system, and provide a unified understanding of the $\pi $-junction transition
caused by three different mechanisms: (1) {\it Zeeman splitting.} For QD with
two spin levels $E_{\uparrow}$ and $E_{\downarrow}$, we find that the surface
of the Josephson current $I(\phi =\frac \pi 2)$ vs the configuration of
$(E_{\uparrow},E_{\downarrow})$ exhibits interesting profile: a sharp peak
around $E_{\uparrow}=E_{\downarrow}=0$; a positive ridge in the region of
$E_{\uparrow}\cdot E_{\downarrow}>0$; and a {\em % negative}, flat, shallow
plain in the region of $E_{\uparrow}\cdot E_{\downarrow}<0$. (2){\it \
Intra-dot interaction.} We deal with the intra-dot Coulomb interaction by
Hartree-Fock approximation, and find that the system behaves as a $\pi
$-junction when QD becomes a magnetic dot due to the interaction. The
conditions for $\pi $-junction transition are also discussed. (3) {\it \
Non-equilibrium distribution.} We replace the Fermi distribution $f(\omega)$ by
a non-equilibrium one $\frac 12[ f(\omega -V_c)+f(\omega +V_c)] $, and allow
Zeeman splitting in QD where $% E_{\uparrow}=-E_{\downarrow}=h.$ The curves of
$I(\phi =\frac \pi 2)$ vs $% V_c$ show the novel effect of interplay of
non-equilibrium distribution with magnetization in QD.
|
[{'version': 'v1', 'created': 'Tue, 27 Mar 2001 02:43:25 GMT'}]
|
2009-11-07
|
[array(['Zhu', 'Yu', ''], dtype=object)
array(['Sun', 'Qing-feng', ''], dtype=object)
array(['Lin', 'Tsung-han', ''], dtype=object)]
|
6,227 |
1306.6527
|
Claes Uggla
|
Claes Uggla
|
Spacetime Singularities: Recent Developments
|
21 pages, 7 figures (16 PDF figure files), plenary contribution to
the Proceedings of the Thirteenth Marcel Grossmann Meeting
|
International Journal of Modern Physics D, Volume 22, Issue 03,
March 2013, 1330002-1330023 (2013)
|
10.1142/S0218271813300024
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent developments concerning oscillatory spacelike singularities in general
relativity are taking place on two fronts. The first treats generic
singularities in spatially homogeneous cosmology, most notably Bianchi types
VIII and IX. The second deals with generic oscillatory singularities in
inhomogeneous cosmologies, especially those with two commuting spacelike
Killing vectors. This paper describes recent progress in these two areas: in
the spatially homogeneous case focus is on mathematically rigorous results,
while analytical and numerical results concerning generic behavior and
so-called recurring spike formation are the main topic in the inhomogeneous
case. Unifying themes are connections between asymptotic behavior, hierarchical
structures, and solution generating techniques, which provide hints for a link
between the nature of generic singularities and a hierarchy of hidden
asymptotic symmetries.
|
[{'version': 'v1', 'created': 'Thu, 27 Jun 2013 14:51:57 GMT'}]
|
2013-06-28
|
[array(['Uggla', 'Claes', ''], dtype=object)]
|
6,228 |
1008.0479
|
Colin Wilkin
|
Colin Wilkin
|
Meson Production at COSY-TOF and COSY-ANKE
|
Invited talk at the MESON2010 conference in Krakow, June 2010
|
Int.J.Mod.Phys.A26:378-383,2011
|
10.1142/S0217751X1105169X
| null |
nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The roles of the COSY-TOF and COSY-ANKE spectrometers in the measurement of
strange meson production are briefly reviewed, mainly in connection with new
results on the pp -> K^+ p Lambda, pp -> K^+ p Sigma^0 and pp -> K^+ n Sigma^+
reactions.
|
[{'version': 'v1', 'created': 'Tue, 3 Aug 2010 08:12:06 GMT'}]
|
2011-03-02
|
[array(['Wilkin', 'Colin', ''], dtype=object)]
|
6,229 |
cond-mat/9909291
| null |
R. Balian (CEA/Saclay, SPhT, France), J.-P. Blaizot (CEA/Saclay, SPhT,
France)
|
Stars and statistical physics: a teaching experience
|
latex gould_last.tex, 4 files, submitted to Am. J. Phys
| null |
10.1119/1.19105
|
SPhT-T99/101
|
cond-mat.stat-mech nucl-th
| null |
The physics of stars, their workings and their evolution, is a goldmine of
problems in statistical mechanics and thermodynamics. We discuss many examples
that illustrate the possibility of deepening student's knowledge of statistical
mechanics by an introductory study of stars. The matter constituting the
various stellar objects provides examples of equations of state for classical
or quantal and relativistic or non-relativistic gases. Maximum entropy can be
used to characterize thermodynamic and gravitational equilibrium which
determines the structure of stars and predicts their instability above a
certain mass. Contraction accompanying radiation induces either heating or
cooling, which explains the formation of stars above a minimum mass. The
characteristics of the emitted light are understood from black-body radiation
and more precisely from the Boltzmann-Lorentz kinetic equation for photons. The
luminosity is governed by the transport of heat by photons from the center to
the surface. Heat production by thermonuclear fusion is determined by
microscopic balance equations. The stability of the steady state of stars is
controlled by the interplay of thermodynamics and gravitation.
|
[{'version': 'v1', 'created': 'Mon, 20 Sep 1999 12:30:39 GMT'}]
|
2009-10-31
|
[array(['Balian', 'R.', '', 'CEA/Saclay, SPhT, France'], dtype=object)
array(['Blaizot', 'J. -P.', '', 'CEA/Saclay, SPhT,\n France'],
dtype=object) ]
|
6,230 |
2201.09391
|
Ziqiao Ma
|
Jiaqi Ma, Ziqiao Ma, Joyce Chai, Qiaozhu Mei
|
Partition-Based Active Learning for Graph Neural Networks
|
Accepted to Transactions on Machine Learning Research (TMLR). Code
available at: https://github.com/Mars-tin/GraphPart
| null | null | null |
cs.LG cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the problem of semi-supervised learning with Graph Neural Networks
(GNNs) in an active learning setup. We propose GraphPart, a novel
partition-based active learning approach for GNNs. GraphPart first splits the
graph into disjoint partitions and then selects representative nodes within
each partition to query. The proposed method is motivated by a novel analysis
of the classification error under realistic smoothness assumptions over the
graph and the node features. Extensive experiments on multiple benchmark
datasets demonstrate that the proposed method outperforms existing active
learning methods for GNNs under a wide range of annotation budget constraints.
In addition, the proposed method does not introduce additional hyperparameters,
which is crucial for model training, especially in the active learning setting
where a labeled validation set may not be available.
|
[{'version': 'v1', 'created': 'Sun, 23 Jan 2022 22:51:14 GMT'}
{'version': 'v2', 'created': 'Fri, 17 Mar 2023 05:57:03 GMT'}]
|
2023-03-20
|
[array(['Ma', 'Jiaqi', ''], dtype=object)
array(['Ma', 'Ziqiao', ''], dtype=object)
array(['Chai', 'Joyce', ''], dtype=object)
array(['Mei', 'Qiaozhu', ''], dtype=object)]
|
6,231 |
1206.3187
|
Paul Bourgade
|
Paul Bourgade, Horng-Tzer Yau, Jun Yin
|
The local circular law II: the edge case
| null | null | null | null |
math.PR math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the first part of this article, we proved a local version of the circular
law up to the finest scale $N^{-1/2+ \e}$ for non-Hermitian random matrices at
any point $z \in \C$ with $||z| - 1| > c $ for any $c>0$ independent of the
size of the matrix. Under the main assumption that the first three moments of
the matrix elements match those of a standard Gaussian random variable after
proper rescaling, we extend this result to include the edge case $
|z|-1=\oo(1)$. Without the vanishing third moment assumption, we prove that the
circular law is valid near the spectral edge $ |z|-1=\oo(1)$ up to scale
$N^{-1/4+ \e}$.
|
[{'version': 'v1', 'created': 'Thu, 14 Jun 2012 17:17:57 GMT'}
{'version': 'v2', 'created': 'Mon, 9 Jul 2012 12:51:34 GMT'}
{'version': 'v3', 'created': 'Wed, 4 Dec 2013 20:03:16 GMT'}]
|
2013-12-05
|
[array(['Bourgade', 'Paul', ''], dtype=object)
array(['Yau', 'Horng-Tzer', ''], dtype=object)
array(['Yin', 'Jun', ''], dtype=object)]
|
6,232 |
2112.11706
|
Bingxue Wu
|
Bingxue Wu, Jiao Wei, Chen Li, Yudong Yao and Yueyang Teng
|
Entropy Regularized Iterative Weighted Shrinkage-Thresholding Algorithm
(ERIWSTA): An Application to CT Image Restoration
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The iterative weighted shrinkage-thresholding algorithm (IWSTA) has shown
superiority to the classic unweighted iterative shrinkage-thresholding
algorithm (ISTA) for solving linear inverse problems, which address the
attributes differently. This paper proposes a new entropy regularized IWSTA
(ERIWSTA) that adds an entropy regularizer to the cost function to measure the
uncertainty of the weights to stimulate attributes to participate in problem
solving. Then, the weights are solved with a Lagrange multiplier method to
obtain a simple iterative update. The weights can be explained as the
probability of the contribution of an attribute to the problem solution.
Experimental results on CT image restoration show that the proposed method has
better performance in terms of convergence speed and restoration accuracy than
the existing methods.
|
[{'version': 'v1', 'created': 'Wed, 22 Dec 2021 07:34:45 GMT'}]
|
2021-12-23
|
[array(['Wu', 'Bingxue', ''], dtype=object)
array(['Wei', 'Jiao', ''], dtype=object)
array(['Li', 'Chen', ''], dtype=object)
array(['Yao', 'Yudong', ''], dtype=object)
array(['Teng', 'Yueyang', ''], dtype=object)]
|
6,233 |
hep-ph/0204045
|
Herry J. Kwee
|
Christopher D. Carone, Justin M. Conroy, and Herry J. Kwee
|
Bulk Majorons at Colliders
|
11 pages LaTeX, 3 eps figures (references added)
|
Phys.Lett. B538 (2002) 115-120
|
10.1016/S0370-2693(02)01943-3
|
WM-02-103
|
hep-ph
| null |
Lepton number violation may arise via the spontaneous breakdown of a global
symmetry. In extra dimensions, spontaneous lepton number violation in the bulk
implies the existence of a Goldstone boson, the majoron J^(0), as well as an
accompanying tower of Kaluza-Klein (KK) excitations, J^(n). Even if the
zero-mode majoron is very weakly interacting, so that detection in low-energy
processes is difficult, the sum over the tower of KK modes may partially
compensate in processes of relevance at high-energy colliders. Here we consider
the inclusive differential and total cross sections for e^- e^- --> W^- W^- J,
where J represents a sum over KK modes. We show that allowed parameter choices
exist for which this process may be accessible to a TeV-scale electron
collider.
|
[{'version': 'v1', 'created': 'Wed, 3 Apr 2002 23:11:36 GMT'}
{'version': 'v2', 'created': 'Mon, 8 Apr 2002 18:09:49 GMT'}]
|
2015-06-25
|
[array(['Carone', 'Christopher D.', ''], dtype=object)
array(['Conroy', 'Justin M.', ''], dtype=object)
array(['Kwee', 'Herry J.', ''], dtype=object)]
|
6,234 |
1809.01113
|
Bernd Beschoten
|
S. Jafarpisheh, A.W. Cummings, K. Watanabe, T. Taniguchi, B.
Beschoten, and C. Stampfer
|
Proximity-Induced Spin-Orbit Coupling in
Graphene-Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$ Heterostructures
|
9 pages, 8 figures
|
Phys. Rev. B 98, 241402(R) (2018)
|
10.1103/PhysRevB.98.241402
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The weak intrinsic spin-orbit coupling in graphene can be greatly enhanced by
proximity coupling. Here we report on the proximity-induced spin-orbit coupling
in graphene transferred by hexagonal boron nitride (hBN) onto the topological
insulator Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$ (BSTS) which was grown on a
hBN substrate by vapor solid synthesis. Phase coherent transport measurements,
revealing weak localization, allow us to extract the carrier density-dependent
phase coherence length $l_\phi$. While $l_\phi$ increases with increasing
carrier density in the hBN/graphene/hBN reference sample, it decreases in
BSTS/graphene due to the proximity-coupling of BSTS to graphene. The latter
behavior results from D'yakonov-Perel-type spin scattering in graphene with a
large proximity-induced spin-orbit coupling strength of at least 2.5 meV.
|
[{'version': 'v1', 'created': 'Tue, 4 Sep 2018 17:38:53 GMT'}
{'version': 'v2', 'created': 'Mon, 24 Sep 2018 08:18:03 GMT'}]
|
2018-12-05
|
[array(['Jafarpisheh', 'S.', ''], dtype=object)
array(['Cummings', 'A. W.', ''], dtype=object)
array(['Watanabe', 'K.', ''], dtype=object)
array(['Taniguchi', 'T.', ''], dtype=object)
array(['Beschoten', 'B.', ''], dtype=object)
array(['Stampfer', 'C.', ''], dtype=object)]
|
6,235 |
2211.07732
|
Shoham Letzter
|
Shoham Letzter
|
Separating paths systems of almost linear size
|
36 pages, 2 figures
| null | null | null |
math.CO
|
http://creativecommons.org/licenses/by/4.0/
|
A separating path system for a graph $G$ is a collection $\mathcal{P}$ of
paths in $G$ such that for every two edges $e$ and $f$ in $G$, there is a path
in $\mathcal{P}$ that contains $e$ but not $f$. We show that every $n$-vertex
graph has a separating path system of size $O(n \log^* n)$. This improves upon
the previous best upper bound of $O(n \log n)$, and makes progress towards a
conjecture of Falgas-Ravry--Kittipassorn--Kor\'andi--Letzter--Narayanan and
Balogh--Csaba--Martin--Pluh\'ar, according to which an $O(n)$ bound should
hold.
|
[{'version': 'v1', 'created': 'Mon, 14 Nov 2022 20:05:49 GMT'}]
|
2022-11-16
|
[array(['Letzter', 'Shoham', ''], dtype=object)]
|
6,236 |
2306.10092
|
Isaac Sihlangu Mr
|
Isaac Sihlangu and Nadeem Oozeer
|
The Impact of GSM towers in Radio Astronomy
|
2023 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)
|
2023 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)
|
10.1109/RADIO58424.2023.10146053
| null |
astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Radio astronomy is a specialised area of astronomy that examines the radio
emissions from astronomical bodies within the electromagnetic spectrum's radio
range. As radio telescopes have become increasingly sensitive due to
technological advancements, radio astronomers face the significant challenge of
reducing the impact of human-generated radio interference. Our research delved
into the impact of Global System for Mobile Communication (GSM) signals on
radio astronomy data, utilising a multidimensional framework approach with a
probabilistic basis. We discovered a link between the location of cell towers
in the nearby towns surrounding MeerKAT and a high probability of Radio
Frequency Interference (RFI). However, we found no statistically significant
association between the time of day and RFI occurrence at the 68% confidence
level.
|
[{'version': 'v1', 'created': 'Fri, 16 Jun 2023 15:45:27 GMT'}]
|
2023-06-21
|
[array(['Sihlangu', 'Isaac', ''], dtype=object)
array(['Oozeer', 'Nadeem', ''], dtype=object)]
|
6,237 |
2211.11379
|
Alberto Racca
|
Alberto Racca and Nguyen Anh Khoa Doan and Luca Magri
|
Modelling spatiotemporal turbulent dynamics with the convolutional
autoencoder echo state network
| null | null | null | null |
physics.flu-dyn cs.LG nlin.CD
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The spatiotemporal dynamics of turbulent flows is chaotic and difficult to
predict. This makes the design of accurate and stable reduced-order models
challenging. The overarching objective of this paper is to propose a nonlinear
decomposition of the turbulent state for a reduced-order representation of the
dynamics. We divide the turbulent flow into a spatial problem and a temporal
problem. First, we compute the latent space, which is the manifold onto which
the turbulent dynamics live (i.e., it is a numerical approximation of the
turbulent attractor). The latent space is found by a series of nonlinear
filtering operations, which are performed by a convolutional autoencoder (CAE).
The CAE provides the decomposition in space. Second, we predict the time
evolution of the turbulent state in the latent space, which is performed by an
echo state network (ESN). The ESN provides the decomposition in time. Third, by
assembling the CAE and the ESN, we obtain an autonomous dynamical system: the
convolutional autoncoder echo state network (CAE-ESN). This is the
reduced-order model of the turbulent flow. We test the CAE-ESN on a
two-dimensional flow. We show that, after training, the CAE-ESN (i) finds a
latent-space representation of the turbulent flow that has less than 1% of the
degrees of freedom than the physical space; (ii) time-accurately and
statistically predicts the flow in both quasiperiodic and turbulent regimes;
(iii) is robust for different flow regimes (Reynolds numbers); and (iv) takes
less than 1% of computational time to predict the turbulent flow than solving
the governing equations. This work opens up new possibilities for nonlinear
decompositions and reduced-order modelling of turbulent flows from data.
|
[{'version': 'v1', 'created': 'Mon, 21 Nov 2022 11:49:57 GMT'}
{'version': 'v2', 'created': 'Tue, 22 Nov 2022 11:37:43 GMT'}]
|
2022-11-23
|
[array(['Racca', 'Alberto', ''], dtype=object)
array(['Doan', 'Nguyen Anh Khoa', ''], dtype=object)
array(['Magri', 'Luca', ''], dtype=object)]
|
6,238 |
1610.02541
|
Sho Tanimoto
|
Fedor Bogomolov, Lars Halvard Halle, Fabien Pazuki, Sho Tanimoto
|
Abelian Calabi-Yau threefolds: N\'eron models and rational points
|
18 pages
| null | null | null |
math.AG math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study Calabi-Yau threefolds fibered by abelian surfaces, in particular,
their arithmetic properties, e.g., N\'eron models and Zariski density.
|
[{'version': 'v1', 'created': 'Sat, 8 Oct 2016 14:46:55 GMT'}]
|
2016-10-11
|
[array(['Bogomolov', 'Fedor', ''], dtype=object)
array(['Halle', 'Lars Halvard', ''], dtype=object)
array(['Pazuki', 'Fabien', ''], dtype=object)
array(['Tanimoto', 'Sho', ''], dtype=object)]
|
6,239 |
astro-ph/0703646
|
James Schombert
|
J. Schombert (UOregon)
|
ARCHANGEL Galaxy Photometry System
|
31 pages, 14 figures, software package at
http://abyss.uoregon.edu/~js/archangel
| null | null | null |
astro-ph
| null |
Photometry of galaxies has typically focused on small, faint systems due to
their interest for cosmological studies. Large angular size galaxies, on the
other hand, offer a more detailed view into the properties of galaxies, but
bring a series of computational and technical difficulties that inhibit the
general astronomer from extracting all the information found in a detailed
galaxy image. To this end, a new galaxy photometry system has been developed
(mostly building on tools and techniques that have existed in the community for
decades) that combines ease of usage with a mixture of pre-built scripts. The
audience for this system is a new user (graduate student or non-optical
astronomer) with a fast, built-in learning curve to offer any astronomer, with
imaging data, a suite of tools to quickly extract meaningful parameters from
decent data. The tools are available either by a client/server web site or by
tarball for personal installation. The tools also provide simple scripts to
interface with various on-line datasets (e.g. 2MASS, Sloan, DSS) for data
mining capability of imaged data.
As a proof of concept, we preform a re-analysis of the 2MASS Large Galaxy
Atlas to demonstrate the differences in an automated pipeline, with its
emphasis on speed, versus this package with an emphasis on accuracy. This
comparison finds the structural parameters extracted from the 2MASS pipeline is
seriously flawed with scale lengths that are too small by 50% and central
surface brightness that are, on average, 1 to 0.5 mags too bright. A cautionary
tale on how to reduce information-rich data such as surface brightness
profiles. This document and software can be found at
http://abyss.uoregon.edu/~js/archangel.
|
[{'version': 'v1', 'created': 'Mon, 26 Mar 2007 17:58:45 GMT'}]
|
2007-05-23
|
[array(['Schombert', 'J.', '', 'UOregon'], dtype=object)]
|
6,240 |
1605.00172
|
Doron Zeilberger
|
Shalosh B. Ekhad and Doron Zeilberger
|
On the number of Singular Vector Tuples of Hyper-Cubical Tensors
|
4 pages. Accompanied by a Maple package, SVT.txt available from
http://www.math.rutgers.edu/~zeilberg/mamarim/mamarimhtml/svt.html
| null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Shmuel Friedland and Giorgio Ottaviani's beautiful constant term expression
for the number of singular vector tuples of generic tensors is used to derive a
rational generating function for these numbers, that in turn, is used to obtain
an asymptotic formula for the number of such tuples for n by n by n
three-dimensional tensors, and to conjecture an asymptotic formula for the
general d-dimensional case. A donation of 100 dollars, in honor of the first
prover, will be made to the On-line Encyclopedia of Integer Sequences.
|
[{'version': 'v1', 'created': 'Sat, 30 Apr 2016 22:04:05 GMT'}]
|
2016-05-03
|
[array(['Ekhad', 'Shalosh B.', ''], dtype=object)
array(['Zeilberger', 'Doron', ''], dtype=object)]
|
6,241 |
0711.1840
|
Bernard Shiffman
|
Bernard Shiffman, Steve Zelditch
|
Number variance of random zeros on complex manifolds, II: smooth
statistics
|
17 pages. This paper is a follow-up to arXiv:math/0608743v2 and
includes the smooth statistics in the earlier version arXiv:math/0608743v1
and the asymptotic normality result in our previous posting
arXiv:math/0512652v3 as well as stating some open problems
|
Special issue in honor of Joseph J. Kohn, Pure Appl. Math. Q. 6
(2010), 1145-1167
| null | null |
math.CV math.AG math.PR
| null |
We consider the zero sets $Z_N$ of systems of $m$ random polynomials of
degree $N$ in $m$ complex variables, and we give asymptotic formulas for the
random variables given by summing a smooth test function over $Z_N$. Our
asymptotic formulas show that the variances for these smooth statistics have
the growth $N^{m-2}$. We also prove analogues for the integrals of smooth test
forms over the subvarieties defined by $k<m$ random polynomials. Such linear
statistics of random zero sets are smooth analogues of the random variables
given by counting the number of zeros in an open set, which we proved elsewhere
to have variances of order $N^{m-1/2}$. We use the variance asymptotics and
off-diagonal estimates of Szego kernels to extend an asymptotic normality
result of Sodin-Tsirelson to the case of smooth linear statistics for zero sets
of codimension one in any dimension $m$.
|
[{'version': 'v1', 'created': 'Mon, 12 Nov 2007 18:30:24 GMT'}]
|
2010-05-28
|
[array(['Shiffman', 'Bernard', ''], dtype=object)
array(['Zelditch', 'Steve', ''], dtype=object)]
|
6,242 |
1510.00889
|
Kardi Teknomo
|
Kardi Teknomo and Proceso Fernandez
|
Background Image Generation Using Boolean Operations
| null |
Philippine Computing Journal Vol 4 No 2, December 2009, pp. 43-49
| null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Tracking moving objects from a video sequence requires segmentation of these
objects from the background image. However, getting the actual background image
automatically without object detection and using only the video is difficult.
In this paper, we describe a novel algorithm that generates background from
real world images without foreground detection. The algorithm assumes that the
background image is shown in the majority of the video. Given this simple
assumption, the method described in this paper is able to accurately generate,
with high probability, the background image from a video using only a small
number of binary operations.
|
[{'version': 'v1', 'created': 'Sun, 4 Oct 2015 00:34:56 GMT'}]
|
2015-10-06
|
[array(['Teknomo', 'Kardi', ''], dtype=object)
array(['Fernandez', 'Proceso', ''], dtype=object)]
|
6,243 |
quant-ph/0506222
|
Ernesto F. Galvao
|
Cecilia Cormick, Ernesto F. Galvao, Daniel Gottesman, Juan Pablo Paz,
Arthur O. Pittenger
|
Classicality in discrete Wigner functions
|
10 pages, 1 figure
|
Phys. Rev. A 73, 012301 (2006)
|
10.1103/PhysRevA.73.012301
| null |
quant-ph
| null |
Gibbons et al. [Phys. Rev. A 70, 062101(2004)] have recently defined a class
of discrete Wigner functions W to represent quantum states in a Hilbert space
with finite dimension. We show that the only pure states having non-negative W
for all such functions are stabilizer states, as conjectured by one of us
[Phys. Rev. A 71, 042302 (2005)]. We also show that the unitaries preserving
non-negativity of W for all definitions of W form a subgroup of the Clifford
group. This means pure states with non-negative W and their associated unitary
dynamics are classical in the sense of admitting an efficient classical
simulation scheme using the stabilizer formalism.
|
[{'version': 'v1', 'created': 'Mon, 27 Jun 2005 15:16:55 GMT'}]
|
2007-05-23
|
[array(['Cormick', 'Cecilia', ''], dtype=object)
array(['Galvao', 'Ernesto F.', ''], dtype=object)
array(['Gottesman', 'Daniel', ''], dtype=object)
array(['Paz', 'Juan Pablo', ''], dtype=object)
array(['Pittenger', 'Arthur O.', ''], dtype=object)]
|
6,244 |
1610.02350
|
Xuefei Yan
|
X. Yan, K. Allada, K. Aniol, J.R.M. Annand, T. Averett, F. Benmokhtar,
W. Bertozzi, P.C. Bradshaw, P. Bosted, A. Camsonne, M. Canan, G.D. Cates, C.
Chen, J.-P. Chen, W. Chen, K. Chirapatpimol, E. Chudakov, E. Cisbani, J.C.
Cornejo, F. Cusanno, M.M. Dalton, W. Deconinck, C.W. de Jager, R. De Leo, X.
Deng, A. Deur, H. Ding, P. A. M. Dolph, C. Dutta, D. Dutta, L. El Fassi, S.
Frullani, H. Gao, F. Garibaldi, D. Gaskell, S. Gilad, R. Gilman, O.
Glamazdin, S. Golge, L. Guo, D. Hamilton, O. Hansen, D.W. Higinbotham, T.
Holmstrom, J. Huang, M. Huang, H. F Ibrahim, M. Iodice, X. Jiang, G. Jin,
M.K. Jones, J. Katich, A. Kelleher, W. Kim, A. Kolarkar, W. Korsch, J.J.
LeRose, X. Li, Y. Li, R. Lindgren, T. Liu, N. Liyanage, E. Long, H.-J. Lu,
D.J. Margaziotis, P. Markowitz, S. Marrone, D. McNulty, Z.-E. Meziani, R.
Michaels, B. Moffit, C. Munoz Camacho, S. Nanda, A. Narayan, V. Nelyubin, B.
Norum, Y. Oh, M. Osipenko, D. Parno, J.-C. Peng, S. K. Phillips, M. Posik,
A.J.R. Puckett, X. Qian, Y. Qiang, A. Rakhman, R. Ransome, S. Riordan, A.
Saha, B. Sawatzky, E. Schulte, A. Shahinyan, M.H. Shabestari, S. Sirca, S.
Stepanyan, R. Subedi, V. Sulkosky, L.-G. Tang, W. A. Tobias, G. M. Urciuoli,
I. Vilardi, K. Wang, B. Wojtsekhowski, Y. Wang, X. Yan, H. Yao, Y. Ye, Z. Ye,
L. Yuan, X. Zhan, Y. Zhang, Y.-W. Zhang, B. Zhao, Y.X. Zhao, X. Zheng, L.
Zhu, X. Zhu, and X. Zong
|
First measurement of unpolarized SIDIS cross section and cross section
ratios from a $^3$He target
| null |
Phys. Rev. C 95, 035209 (2017)
|
10.1103/PhysRevC.95.035209
| null |
nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The unpolarized semi-inclusive deep-inelastic scattering (SIDIS) differential
cross sections in $^3$He($e,e^{\prime}\pi^{\pm}$)$X$ have been measured for the
first time in Jefferson Lab experiment E06-010 performed with a $5.9\,$GeV
$e^-$ beam on a $^3$He target. The experiment focuses on the valence quark
region, covering a kinematic range $0.12 < x_{bj} < 0.45$, $1 < Q^2 < 4 \,
\textrm{(GeV/c)}^2$, $0.45 < z_{h} < 0.65$, and $0.05 < P_t < 0.55 \,
\textrm{GeV/c}$. The extracted SIDIS differential cross sections of $\pi^{\pm}$
production are compared with existing phenomenological models while the $^3$He
nucleus approximated as two protons and one neutron in a plane wave picture, in
multi-dimensional bins. Within the experimental uncertainties, the azimuthal
modulations of the cross sections are found to be consistent with zero.
|
[{'version': 'v1', 'created': 'Fri, 7 Oct 2016 17:14:23 GMT'}
{'version': 'v2', 'created': 'Tue, 15 Nov 2016 11:22:11 GMT'}]
|
2017-03-29
|
[array(['Yan', 'X.', ''], dtype=object)
array(['Allada', 'K.', ''], dtype=object)
array(['Aniol', 'K.', ''], dtype=object)
array(['Annand', 'J. R. M.', ''], dtype=object)
array(['Averett', 'T.', ''], dtype=object)
array(['Benmokhtar', 'F.', ''], dtype=object)
array(['Bertozzi', 'W.', ''], dtype=object)
array(['Bradshaw', 'P. C.', ''], dtype=object)
array(['Bosted', 'P.', ''], dtype=object)
array(['Camsonne', 'A.', ''], dtype=object)
array(['Canan', 'M.', ''], dtype=object)
array(['Cates', 'G. D.', ''], dtype=object)
array(['Chen', 'C.', ''], dtype=object)
array(['Chen', 'J. -P.', ''], dtype=object)
array(['Chen', 'W.', ''], dtype=object)
array(['Chirapatpimol', 'K.', ''], dtype=object)
array(['Chudakov', 'E.', ''], dtype=object)
array(['Cisbani', 'E.', ''], dtype=object)
array(['Cornejo', 'J. C.', ''], dtype=object)
array(['Cusanno', 'F.', ''], dtype=object)
array(['Dalton', 'M. M.', ''], dtype=object)
array(['Deconinck', 'W.', ''], dtype=object)
array(['de Jager', 'C. W.', ''], dtype=object)
array(['De Leo', 'R.', ''], dtype=object)
array(['Deng', 'X.', ''], dtype=object)
array(['Deur', 'A.', ''], dtype=object)
array(['Ding', 'H.', ''], dtype=object)
array(['Dolph', 'P. A. M.', ''], dtype=object)
array(['Dutta', 'C.', ''], dtype=object)
array(['Dutta', 'D.', ''], dtype=object)
array(['Fassi', 'L. El', ''], dtype=object)
array(['Frullani', 'S.', ''], dtype=object)
array(['Gao', 'H.', ''], dtype=object)
array(['Garibaldi', 'F.', ''], dtype=object)
array(['Gaskell', 'D.', ''], dtype=object)
array(['Gilad', 'S.', ''], dtype=object)
array(['Gilman', 'R.', ''], dtype=object)
array(['Glamazdin', 'O.', ''], dtype=object)
array(['Golge', 'S.', ''], dtype=object)
array(['Guo', 'L.', ''], dtype=object)
array(['Hamilton', 'D.', ''], dtype=object)
array(['Hansen', 'O.', ''], dtype=object)
array(['Higinbotham', 'D. W.', ''], dtype=object)
array(['Holmstrom', 'T.', ''], dtype=object)
array(['Huang', 'J.', ''], dtype=object)
array(['Huang', 'M.', ''], dtype=object)
array(['Ibrahim', 'H. F', ''], dtype=object)
array(['Iodice', 'M.', ''], dtype=object)
array(['Jiang', 'X.', ''], dtype=object)
array(['Jin', 'G.', ''], dtype=object)
array(['Jones', 'M. K.', ''], dtype=object)
array(['Katich', 'J.', ''], dtype=object)
array(['Kelleher', 'A.', ''], dtype=object)
array(['Kim', 'W.', ''], dtype=object)
array(['Kolarkar', 'A.', ''], dtype=object)
array(['Korsch', 'W.', ''], dtype=object)
array(['LeRose', 'J. J.', ''], dtype=object)
array(['Li', 'X.', ''], dtype=object)
array(['Li', 'Y.', ''], dtype=object)
array(['Lindgren', 'R.', ''], dtype=object)
array(['Liu', 'T.', ''], dtype=object)
array(['Liyanage', 'N.', ''], dtype=object)
array(['Long', 'E.', ''], dtype=object)
array(['Lu', 'H. -J.', ''], dtype=object)
array(['Margaziotis', 'D. J.', ''], dtype=object)
array(['Markowitz', 'P.', ''], dtype=object)
array(['Marrone', 'S.', ''], dtype=object)
array(['McNulty', 'D.', ''], dtype=object)
array(['Meziani', 'Z. -E.', ''], dtype=object)
array(['Michaels', 'R.', ''], dtype=object)
array(['Moffit', 'B.', ''], dtype=object)
array(['Camacho', 'C. Munoz', ''], dtype=object)
array(['Nanda', 'S.', ''], dtype=object)
array(['Narayan', 'A.', ''], dtype=object)
array(['Nelyubin', 'V.', ''], dtype=object)
array(['Norum', 'B.', ''], dtype=object)
array(['Oh', 'Y.', ''], dtype=object)
array(['Osipenko', 'M.', ''], dtype=object)
array(['Parno', 'D.', ''], dtype=object)
array(['Peng', 'J. -C.', ''], dtype=object)
array(['Phillips', 'S. K.', ''], dtype=object)
array(['Posik', 'M.', ''], dtype=object)
array(['Puckett', 'A. J. R.', ''], dtype=object)
array(['Qian', 'X.', ''], dtype=object)
array(['Qiang', 'Y.', ''], dtype=object)
array(['Rakhman', 'A.', ''], dtype=object)
array(['Ransome', 'R.', ''], dtype=object)
array(['Riordan', 'S.', ''], dtype=object)
array(['Saha', 'A.', ''], dtype=object)
array(['Sawatzky', 'B.', ''], dtype=object)
array(['Schulte', 'E.', ''], dtype=object)
array(['Shahinyan', 'A.', ''], dtype=object)
array(['Shabestari', 'M. H.', ''], dtype=object)
array(['Sirca', 'S.', ''], dtype=object)
array(['Stepanyan', 'S.', ''], dtype=object)
array(['Subedi', 'R.', ''], dtype=object)
array(['Sulkosky', 'V.', ''], dtype=object)
array(['Tang', 'L. -G.', ''], dtype=object)
array(['Tobias', 'W. A.', ''], dtype=object)
array(['Urciuoli', 'G. M.', ''], dtype=object)
array(['Vilardi', 'I.', ''], dtype=object)
array(['Wang', 'K.', ''], dtype=object)
array(['Wojtsekhowski', 'B.', ''], dtype=object)
array(['Wang', 'Y.', ''], dtype=object)
array(['Yan', 'X.', ''], dtype=object)
array(['Yao', 'H.', ''], dtype=object)
array(['Ye', 'Y.', ''], dtype=object)
array(['Ye', 'Z.', ''], dtype=object)
array(['Yuan', 'L.', ''], dtype=object)
array(['Zhan', 'X.', ''], dtype=object)
array(['Zhang', 'Y.', ''], dtype=object)
array(['Zhang', 'Y. -W.', ''], dtype=object)
array(['Zhao', 'B.', ''], dtype=object)
array(['Zhao', 'Y. X.', ''], dtype=object)
array(['Zheng', 'X.', ''], dtype=object)
array(['Zhu', 'L.', ''], dtype=object)
array(['Zhu', 'X.', ''], dtype=object)
array(['Zong', 'X.', ''], dtype=object)]
|
6,245 |
1907.04408
|
Curtis Bright
|
Curtis Bright, Ilias Kotsireas, Vijay Ganesh
|
SAT Solvers and Computer Algebra Systems: A Powerful Combination for
Mathematics
|
To appear in Proceedings of the 29th International Conference on
Computer Science and Software Engineering
| null | null | null |
cs.LO cs.AI cs.SC math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Over the last few decades, many distinct lines of research aimed at
automating mathematics have been developed, including computer algebra systems
(CASs) for mathematical modelling, automated theorem provers for first-order
logic, SAT/SMT solvers aimed at program verification, and higher-order proof
assistants for checking mathematical proofs. More recently, some of these lines
of research have started to converge in complementary ways. One success story
is the combination of SAT solvers and CASs (SAT+CAS) aimed at resolving
mathematical conjectures.
Many conjectures in pure and applied mathematics are not amenable to
traditional proof methods. Instead, they are best addressed via computational
methods that involve very large combinatorial search spaces. SAT solvers are
powerful methods to search through such large combinatorial
spaces---consequently, many problems from a variety of mathematical domains
have been reduced to SAT in an attempt to resolve them. However, solvers
traditionally lack deep repositories of mathematical domain knowledge that can
be crucial to pruning such large search spaces. By contrast, CASs are deep
repositories of mathematical knowledge but lack efficient general search
capabilities. By combining the search power of SAT with the deep mathematical
knowledge in CASs we can solve many problems in mathematics that no other known
methods seem capable of solving.
We demonstrate the success of the SAT+CAS paradigm by highlighting many
conjectures that have been disproven, verified, or partially verified using our
tool MathCheck. These successes indicate that the paradigm is positioned to
become a standard method for solving problems requiring both a significant
amount of search and deep mathematical reasoning. For example, the SAT+CAS
paradigm has recently been used by Heule, Kauers, and Seidl to find many new
algorithms for $3\times3$ matrix multiplication.
|
[{'version': 'v1', 'created': 'Tue, 9 Jul 2019 20:49:14 GMT'}
{'version': 'v2', 'created': 'Mon, 16 Sep 2019 17:24:42 GMT'}]
|
2019-09-18
|
[array(['Bright', 'Curtis', ''], dtype=object)
array(['Kotsireas', 'Ilias', ''], dtype=object)
array(['Ganesh', 'Vijay', ''], dtype=object)]
|
6,246 |
cond-mat/0003161
|
Lothar Schuelke
|
L. Schuelke (1) and B. Zheng (2,3) ((1) Universitaet Siegen, Germany,
(2) Universitaet Halle, Germany (3) Academy of Science, P.R. China)
|
Dynamic Approach to Weak First Order Phase Transitions
|
9 pages with 4 postscript figures included
|
Phys.Rev.E62:7482,2000
|
10.1103/PhysRevE.62.7482
| null |
cond-mat.soft cond-mat.stat-mech
| null |
A short-time dynamic approach to weak first order phase transitions is
proposed. Taking the 2-dimensional Potts models as examples, from short-time
behaviour of non-equilibrium relaxational processes starting from high
temperature and zero temperature states,x pseudo critical points K^{*} and
K^{**} are determined. A clear difference of the values for K^{*} and K^{**}
distinguishes a weak first order transition from a second order one. At the
pseudo critical points, pseudo critical exponents can be estimated.
|
[{'version': 'v1', 'created': 'Thu, 9 Mar 2000 22:31:09 GMT'}]
|
2008-12-18
|
[array(['Schuelke', 'L.', ''], dtype=object)
array(['Zheng', 'B.', ''], dtype=object)]
|
6,247 |
1403.2144
|
Yunhe Sheng
|
Yunhe Sheng
|
Categorification of Pre-Lie Algebras and Solutions of 2-graded Classical
Yang-Baxter Equations
|
22 pages
|
Theo. Appl. Cate. 34 (2019), 269-294
| null | null |
math-ph math.MP math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we introduce the notion of a pre-Lie 2-algebra, which is a
categorification of a pre-Lie algebra. We prove that the category of pre-Lie
2-algebras and the category of 2-term pre-Lie$_\infty$-algebras are equivalent.
We classify skeletal pre-Lie 2-algebras by the third cohomology of a pre-Lie
algebra. We prove that crossed modules of pre-Lie algebras are in one-to-one
correspondence with strict pre-Lie 2-algebras. $\mathcal O$-operators on Lie
2-algebras are introduced, which can be used to construct pre-Lie 2-algebras.
As an application, we give solutions of 2-graded classical Yang-Baxter
equations in some semidirect product Lie 2-algebras.
|
[{'version': 'v1', 'created': 'Mon, 10 Mar 2014 06:51:26 GMT'}]
|
2020-02-28
|
[array(['Sheng', 'Yunhe', ''], dtype=object)]
|
6,248 |
2305.04439
|
Duc Tu Dao
|
Goyal Keshav, Duc Tu Dao, Han Mao Kiah, and Mladen Kovacevic
|
Evaluation of the Gilbert-Varshamov Bound using Multivariate Analytic
Combinatorics
| null | null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Analytic combinatorics in several variables refers to a suite of tools that
provide sharp asymptotic estimates for certain combinatorial quantities. In
this paper, we apply these tools to determine the Gilbert-Varshamov (GV) bound
for the sticky insertion and the constrained-synthesis channel.
|
[{'version': 'v1', 'created': 'Mon, 8 May 2023 03:25:12 GMT'}]
|
2023-05-09
|
[array(['Keshav', 'Goyal', ''], dtype=object)
array(['Dao', 'Duc Tu', ''], dtype=object)
array(['Kiah', 'Han Mao', ''], dtype=object)
array(['Kovacevic', 'Mladen', ''], dtype=object)]
|
6,249 |
0808.0927
|
Zhao Zhang
|
Zhao Zhang, Kenji Fukushima, Teiji Kunihiro
|
Another chiral critical end-point induced by neutral color
superconductivity
|
This paper has been withdrawn by the authors, due to it's
incompleteness
| null |
10.1103/PhysRevD.79.014004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper has been withdrawn by the authors, due to it's incompleteness.
|
[{'version': 'v1', 'created': 'Wed, 6 Aug 2008 21:14:00 GMT'}
{'version': 'v2', 'created': 'Wed, 13 Aug 2008 06:34:12 GMT'}]
|
2013-05-29
|
[array(['Zhang', 'Zhao', ''], dtype=object)
array(['Fukushima', 'Kenji', ''], dtype=object)
array(['Kunihiro', 'Teiji', ''], dtype=object)]
|
6,250 |
1410.4468
|
Mehdi Madani
|
Mehdi Madani, Mathieu Van Vyve
|
A MIP framework for non-convex uniform price day-ahead electricity
auctions
| null | null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is well-known that a market equilibrium with uniform prices often does not
exist in non-convex day-ahead electricity auctions. We consider the case of the
non-convex, uniform-price Pan-European day-ahead electricity market "PCR"
(Price Coupling of Regions), with non-convexities arising from so-called
complex and block orders. Extending previous results, we propose a new
primal-dual framework for these auctions, which has applications in both
economic analysis and algorithm design. The contribution here is threefold.
First, from the algorithmic point of view, we give a non-trivial exact (i.e.
not approximate) linearization of a non-convex 'minimum income condition' that
must hold for complex orders arising from the Spanish market, avoiding the
introduction of any auxiliary variables, and allowing us to solve market
clearing instances involving most of the bidding products proposed in PCR using
off-the-shelf MIP solvers. Second, from the economic analysis point of view, we
give the first MILP formulations of optimization problems such as the
maximization of the traded volume, or the minimization of opportunity costs of
paradoxically rejected block bids. We first show on a toy example that these
two objectives are distinct from maximizing welfare. We also recover directly a
previously noted property of an alternative market model. Third, we provide
numerical experiments on realistic large-scale instances. They illustrate the
efficiency of the approach, as well as the economics trade-offs that may occur
in practice.
|
[{'version': 'v1', 'created': 'Thu, 16 Oct 2014 15:36:01 GMT'}
{'version': 'v2', 'created': 'Fri, 30 Jan 2015 12:57:15 GMT'}]
|
2015-02-02
|
[array(['Madani', 'Mehdi', ''], dtype=object)
array(['Van Vyve', 'Mathieu', ''], dtype=object)]
|
6,251 |
1605.07351
|
Dmitrii Nabok
|
Dmitrii Nabok, Andris Gulans, and Claudia Draxl
|
Accurate all-electron $G_0W_0$ quasiparticle energies employing the
full-potential augmented planewave method
| null | null |
10.1103/PhysRevB.94.035118
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $GW$ approach of many-body perturbation theory (MBPT) has become a common
tool for calculating the electronic structure of materials. However, with
increasing number of published results, discrepancies between the values
obtained by different methods and codes become more and more apparent. For a
test set of small- and wide-gap semiconductors, we demonstrate how to reach the
numerically \emph{best} electronic structure within the framework of the
full-potential linearized augmented planewave (FLAPW) method. We first evaluate
the impact of local orbitals in the Kohn-Sham eigenvalue spectrum of the
underlying starting point. The role of the basis-set quality is then further
analyzed when calculating the $G_0W_0$ quasiparticle energies. Our results,
computed with the \exciting{} code, are compared to those obtained using the
projector-augmented planewave (PAW) formalism, finding overall, good agreement
between both methods. We also provide data produced with a typical FLAPW basis
set as a benchmark for other $G_0W_0$ implementations.
|
[{'version': 'v1', 'created': 'Tue, 24 May 2016 09:35:28 GMT'}]
|
2016-08-03
|
[array(['Nabok', 'Dmitrii', ''], dtype=object)
array(['Gulans', 'Andris', ''], dtype=object)
array(['Draxl', 'Claudia', ''], dtype=object)]
|
6,252 |
1501.05782
|
Andy Chung
|
Anotida Madzvamuse and Andy H.W. Chung
|
Fully implicit time-stepping schemes and non-linear solvers for systems
of reaction-diffusion equations
|
19 pages, 8 figures
|
Applied Mathematics and Computation, Volume 244, 1 October 2014,
Pages 361-374
|
10.1016/j.amc.2014.07.004
| null |
math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we present robust, efficient and accurate fully implicit
time-stepping schemes and nonlinear solvers for systems of reaction-diffusion
equations. The applications of reaction-diffusion systems is abundant in the
literature, from modelling pattern formation in developmental biology to cancer
research, wound healing, tissue and bone regeneration and cell motility.
Therefore, it is crucial that modellers, analysts and biologists are able to
solve accurately and efficiently systems of highly nonlinear parabolic partial
differential equations on complex stationary and sometimes continuously
evolving domains and surfaces. The main contribution of our paper is the study
of fully implicit schemes by use of the Newton method and the Picard iteration
applied to the backward Euler, the Crank-Nicolson (and its modifications) and
the fractional-step theta methods. Our results conclude that the
fractional-step theta method coupled with a single Newton iteration at each
timestep is as accurate as the fully adaptive Newton method; and both
outperform the Picard iteration. In particular, the results strongly support
the observation that a single Newton iteration is sufficient to yield as
accurate results as those obtained by use of an adaptive Newton method. This is
particularly advantageous when solving highly complex nonlinear partial
differential equations on evolving domains and surfaces. To validate our
theoretical results, various appropriate numerical experiments are exhibited on
stationary planary domains and in the bulk of stationary surfaces.
|
[{'version': 'v1', 'created': 'Fri, 23 Jan 2015 12:10:15 GMT'}]
|
2015-01-26
|
[array(['Madzvamuse', 'Anotida', ''], dtype=object)
array(['Chung', 'Andy H. W.', ''], dtype=object)]
|
6,253 |
1802.02194
|
Timothy Burness
|
Timothy C. Burness, Martin W. Liebeck, Aner Shalev
|
On the length and depth of finite groups (with an appendix by D.R.
Heath-Brown)
|
29 pages; to appear in Proc. London Math. Soc
| null |
10.1112/plms.12273
| null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An unrefinable chain of a finite group $G$ is a chain of subgroups $G = G_0 >
G_1 > \cdots > G_t = 1$, where each $G_i$ is a maximal subgroup of $G_{i-1}$.
The length (respectively, depth) of $G$ is the maximal (respectively, minimal)
length of such a chain. We studied the depth of finite simple groups in a
previous paper, which included a classification of the simple groups of depth
$3$. Here we go much further by determining the finite groups of depth $3$ and
$4$. We also obtain several new results on the lengths of finite groups. For
example, we classify the simple groups of length at most $9$, which extends
earlier work of Janko and Harada from the 1960s, and we use this to describe
the structure of arbitrary finite groups of small length. We also present a
number-theoretic result of Heath-Brown, which implies that there are infinitely
many non-abelian simple groups of length at most $9$.
Finally we study the chain difference of $G$ (namely the length minus the
depth). We obtain results on groups with chain difference $1$ and $2$,
including a complete classification of the simple groups with chain difference
$2$, extending earlier work of Brewster et al. We also derive a best possible
lower bound on the chain ratio (the length divided by the depth) of simple
groups, which yields an explicit linear bound on the length of $G/R(G)$ in
terms of the chain difference of $G$, where $R(G)$ is the soluble radical of
$G$.
|
[{'version': 'v1', 'created': 'Tue, 6 Feb 2018 20:15:15 GMT'}
{'version': 'v2', 'created': 'Tue, 21 May 2019 14:50:53 GMT'}]
|
2019-07-03
|
[array(['Burness', 'Timothy C.', ''], dtype=object)
array(['Liebeck', 'Martin W.', ''], dtype=object)
array(['Shalev', 'Aner', ''], dtype=object)]
|
6,254 |
1711.10588
|
Ben Abramowitz
|
Ben Abramowitz, Elliot Anshelevich
|
Utilitarians Without Utilities: Maximizing Social Welfare for Graph
Problems using only Ordinal Preferences - Full Version
|
Conference version will appear in AAAI 2018
| null | null | null |
cs.MA cs.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider ordinal approximation algorithms for a broad class of utility
maximization problems for multi-agent systems. In these problems, agents have
utilities for connecting to each other, and the goal is to compute a
maximum-utility solution subject to a set of constraints. We represent these as
a class of graph optimization problems, including matching, spanning tree
problems, TSP, maximum weight planar subgraph, and many others. We study these
problems in the ordinal setting: latent numerical utilities exist, but we only
have access to ordinal preference information, i.e., every agent specifies an
ordering over the other agents by preference. We prove that for the large class
of graph problems we identify, ordinal information is enough to compute
solutions which are close to optimal, thus demonstrating there is no need to
know the underlying numerical utilities. For example, for problems in this
class with bounded degree $b$ a simple ordinal greedy algorithm always produces
a ($b+1$)-approximation; we also quantify how the quality of ordinal
approximation depends on the sparsity of the resulting graphs. In particular,
our results imply that ordinal information is enough to obtain a
2-approximation for Maximum Spanning Tree; a 4-approximation for Max Weight
Planar Subgraph; a 2-approximation for Max-TSP; and a 2-approximation for
various Matching problems.
|
[{'version': 'v1', 'created': 'Tue, 28 Nov 2017 22:17:48 GMT'}]
|
2017-11-30
|
[array(['Abramowitz', 'Ben', ''], dtype=object)
array(['Anshelevich', 'Elliot', ''], dtype=object)]
|
6,255 |
1802.07610
|
Constanze Roitzheim
|
Fernando Muro and Constanze Roitzheim
|
Homotopy Theory of Bicomplexes
|
26 pages
|
Journal of Pure and Applied Algebra 223, Issue 5 (2019) 1913-1939
|
10.1016/j.jpaa.2018.08.007
| null |
math.AT math.KT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We define two model structures on the category of bicomplexes concentrated in
the right half plane. The first model structure has weak equivalences detected
by the totalisation functor. The second model structure's weak equivalences are
detected by the $E^2$-term of the spectral sequence associated to the
filtration of the total complex by the horizontal degree. We then extend this
result to twisted complexes.
|
[{'version': 'v1', 'created': 'Wed, 21 Feb 2018 15:20:41 GMT'}]
|
2023-02-09
|
[array(['Muro', 'Fernando', ''], dtype=object)
array(['Roitzheim', 'Constanze', ''], dtype=object)]
|
6,256 |
2109.10594
|
Aneta Pokorn\'a
|
David Hartman and Aneta Pokorn\'a and Pavel Valtr
|
On the Connectivity and the Diameter of Betweenness-Uniform Graphs
| null | null | null | null |
math.CO cs.DM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Betweenness centrality is a centrality measure based on the overall amount of
shortest paths passing through a given vertex. A graph is betweenness-uniform
if all its vertices have the same betweenness centrality. We study the
properties of betweenness-uniform graphs. In particular, we show that every
connected betweenness-uniform graph is either a cycle or a $3$-connected graph.
Also, we show that betweenness uniform graphs of high maximal degree have small
diameter.
|
[{'version': 'v1', 'created': 'Wed, 22 Sep 2021 08:47:41 GMT'}]
|
2021-09-23
|
[array(['Hartman', 'David', ''], dtype=object)
array(['Pokorná', 'Aneta', ''], dtype=object)
array(['Valtr', 'Pavel', ''], dtype=object)]
|
6,257 |
1912.03800
|
Anirudh Sridhar
|
Anirudh Sridhar and H. Vincent Poor
|
Sequential Estimation of Network Cascades
|
5 pages, 2 figures
| null | null | null |
math.ST cs.IT cs.SI eess.SP math.IT stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the problem of locating the source of a network cascade, given a
noisy time-series of network data. Initially, the cascade starts with one
unknown, affected vertex and spreads deterministically at each time step. The
goal is to find an adaptive procedure that outputs an estimate for the source
as fast as possible, subject to a bound on the estimation error. For a general
class of graphs, we describe a family of matrix sequential probability ratio
tests (MSPRTs) that are first-order asymptotically optimal up to a constant
factor as the estimation error tends to zero. We apply our results to lattices
and regular trees, and show that MSPRTs are asymptotically optimal for regular
trees. We support our theoretical results with simulations.
|
[{'version': 'v1', 'created': 'Mon, 9 Dec 2019 00:58:00 GMT'}
{'version': 'v2', 'created': 'Fri, 31 Jan 2020 16:25:22 GMT'}
{'version': 'v3', 'created': 'Tue, 4 Feb 2020 19:04:00 GMT'}
{'version': 'v4', 'created': 'Wed, 20 May 2020 16:12:45 GMT'}]
|
2020-05-22
|
[array(['Sridhar', 'Anirudh', ''], dtype=object)
array(['Poor', 'H. Vincent', ''], dtype=object)]
|
6,258 |
hep-ph/0412346
|
Derek Teaney
|
Guy D. Moore and Derek Teaney
|
How Much do Heavy Quarks Thermalize in a Heavy Ion Collision?
|
34 pages, 9 figures. Inculdes a detailed comparison with Boltzmann
simulations
|
Phys.Rev. C71 (2005) 064904
|
10.1103/PhysRevC.71.064904
| null |
hep-ph
| null |
We investigate the thermalization of charm quarks in high energy heavy ion
collisions. To this end, we calculate the diffusion coefficient in the
perturbative Quark Gluon Plasma and relate it to collisional energy loss and
momentum broadening. We then use these transport properties to formulate a
Langevin model for the evolution of the heavy quark spectrum in the hot medium.
The model is strictly valid in the non-relativistic limit and for all
velocities $\gamma v < \alphas^{-1/2}$ to leading logarithm in $T/m_D$. The
corresponding Fokker-Planck equation can be solved analytically for a Bjorken
expansion and the solution gives a simple estimate for the medium modifications
of the heavy quark spectrum as a function of the diffusion coefficient. Finally
we solve the Langevin equations numerically in a hydrodynamic simulation of the
heavy ion reaction. The results of this simulation are the medium modifications
of the charm spectrum $R_{AA}$ and the expected elliptic flow $v_2(p_T)$ as a
function of the diffusion coefficient.
|
[{'version': 'v1', 'created': 'Wed, 22 Dec 2004 18:14:50 GMT'}
{'version': 'v2', 'created': 'Mon, 10 Jan 2005 19:48:24 GMT'}
{'version': 'v3', 'created': 'Wed, 16 Mar 2005 22:02:28 GMT'}]
|
2009-11-10
|
[array(['Moore', 'Guy D.', ''], dtype=object)
array(['Teaney', 'Derek', ''], dtype=object)]
|
6,259 |
math/0404350
|
Jeffrey C. Lagarias
|
Jeffrey C. Lagarias
|
A Note on Absolute Derivations and Zeta Functions
|
6 pages, latex; v2 title change, small text changes
|
in: Number Fields and Function Fields: Two Parallel Worlds (G. van
der Geer, B. Moonen, R. Schoof, Eds.), Birkhauser: Boston 2005, pp. 279--285
| null | null |
math.NT math.AG math.SP
| null |
This comment answers a question raised by Kurokawa, Ochiai and Wakayama
whether a certain operator constructed using a notion of quantum
non-commutativity of primes has eigenvalues related to the Riemann zeta zeros.
|
[{'version': 'v1', 'created': 'Tue, 20 Apr 2004 02:35:40 GMT'}
{'version': 'v2', 'created': 'Sun, 23 Apr 2006 00:52:54 GMT'}]
|
2007-05-23
|
[array(['Lagarias', 'Jeffrey C.', ''], dtype=object)]
|
6,260 |
2204.09009
|
Ishay Haviv
|
Ishay Haviv
|
A Fixed-Parameter Algorithm for the Schrijver Problem
|
19 pages. arXiv admin note: substantial text overlap with
arXiv:2204.06761
| null | null | null |
cs.DS math.CO
|
http://creativecommons.org/licenses/by/4.0/
|
The Schrijver graph $S(n,k)$ is defined for integers $n$ and $k$ with $n \geq
2k$ as the graph whose vertices are all the $k$-subsets of $\{1,2,\ldots,n\}$
that do not include two consecutive elements modulo $n$, where two such sets
are adjacent if they are disjoint. A result of Schrijver asserts that the
chromatic number of $S(n,k)$ is $n-2k+2$ (Nieuw Arch. Wiskd., 1978). In the
computational Schrijver problem, we are given an access to a coloring of the
vertices of $S(n,k)$ with $n-2k+1$ colors, and the goal is to find a
monochromatic edge. The Schrijver problem is known to be complete in the
complexity class $\mathsf{PPA}$. We prove that it can be solved by a randomized
algorithm with running time $n^{O(1)} \cdot k^{O(k)}$, hence it is
fixed-parameter tractable with respect to the parameter $k$.
|
[{'version': 'v1', 'created': 'Tue, 19 Apr 2022 17:09:01 GMT'}
{'version': 'v2', 'created': 'Sun, 1 May 2022 06:49:00 GMT'}]
|
2022-05-03
|
[array(['Haviv', 'Ishay', ''], dtype=object)]
|
6,261 |
2303.04532
|
Shrestha Ghosh
|
Shrestha Ghosh, Simon Razniewski, Gerhard Weikum
|
Class Cardinality Comparison as a Fermi Problem
|
Accepted to the Web Conference 2023
| null | null | null |
cs.IR cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Questions on class cardinality comparisons are quite tricky to answer and
come with its own challenges. They require some kind of reasoning since web
documents and knowledge bases, indispensable sources of information, rarely
store direct answers to questions, such as, ``Are there more astronauts or
Physics Nobel Laureates?'' We tackle questions on class cardinality comparison
by tapping into three sources for absolute cardinalities as well as the
cardinalities of orthogonal subgroups of the classes. We propose novel
techniques for aggregating signals with partial coverage for more reliable
estimates and evaluate them on a dataset of 4005 class pairs, achieving an
accuracy of 83.7%.
|
[{'version': 'v1', 'created': 'Wed, 8 Mar 2023 12:04:16 GMT'}]
|
2023-03-09
|
[array(['Ghosh', 'Shrestha', ''], dtype=object)
array(['Razniewski', 'Simon', ''], dtype=object)
array(['Weikum', 'Gerhard', ''], dtype=object)]
|
6,262 |
0708.2222
|
Gabriel Fabricius
|
M. A. Bab, G. Fabricius and Ezequiel V. Albano. (INIFTA, UNLP. La
Plata. Argentina)
|
On the occurrence of oscillatory modulations in the power-law behavior
of dynamic and kinetic processes in fractals
|
6 pages, 3 figures. Submitted to EPL
| null |
10.1209/0295-5075/81/10003
| null |
cond-mat.stat-mech
| null |
The dynamic and kinetic behavior of processes occurring in fractals with
spatial discrete scale invariance (DSI) is considered. Spatial DSI implies the
existence of a fundamental scaling ratio (b_1). We address time-dependent
physical processes, which as a consequence of the time evolution develop a
characteristic length of the form $\xi \propto t^{1/z}$, where z is the dynamic
exponent. So, we conjecture that the interplay between the physical process and
the symmetry properties of the fractal leads to the occurrence of time DSI
evidenced by soft log-periodic modulations of physical observables, with a
fundamental time scaling ratio given by $\tau = b_1 ^z$. The conjecture is
tested numerically for random walks, and representative systems of broad
universality classes in the fields of irreversible and equilibrium critical
phenomena.
|
[{'version': 'v1', 'created': 'Thu, 16 Aug 2007 15:26:14 GMT'}]
|
2009-11-13
|
[array(['Bab', 'M. A.', '', 'INIFTA, UNLP. La\n Plata. Argentina'],
dtype=object)
array(['Fabricius', 'G.', '', 'INIFTA, UNLP. La\n Plata. Argentina'],
dtype=object)
array(['Albano.', 'Ezequiel V.', '',
'INIFTA, UNLP. La\n Plata. Argentina'], dtype=object)]
|
6,263 |
1610.07174
|
David M\'endez
|
David M\'endez
|
Colouring simplicial complexes via the Lechuga-Murillo's model
|
7 pages. The article has been rewritten following the comments of a
referee, to whom I am grateful for their feedback which helped greatly
improve the presentation of this work. To appear in Appl. Algebra Engrg.
Comm. Comput
| null | null | null |
math.AT math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
L. Lechuga and A. Murillo showed that a non-oriented, simple, connected,
finite graph $G$ is $k$-colourable if and only if a certain pure Sullivan
algebra associated to $G$ and $k$ is not elliptic. In this paper, we extend
this result to simplicial complexes by means of several notions of colourings
of these objects.
|
[{'version': 'v1', 'created': 'Sun, 23 Oct 2016 14:11:31 GMT'}
{'version': 'v2', 'created': 'Wed, 13 May 2020 14:57:16 GMT'}]
|
2020-05-14
|
[array(['Méndez', 'David', ''], dtype=object)]
|
6,264 |
1911.11704
|
Jeffrey Shallit
|
Lukas Fleischer and Jeffrey Shallit
|
Words Avoiding Reversed Factors, Revisited
| null | null | null | null |
cs.FL cs.DM math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In 2005, Rampersad and the second author proved a number of theorems about
infinite words x with the property that if w is any sufficiently long finite
factor of x, then its reversal w^R is not a factor of x. In this note we
revisit these results, reproving them in more generality, using machine
computations only. Two different techniques are presented.
|
[{'version': 'v1', 'created': 'Tue, 26 Nov 2019 17:14:56 GMT'}
{'version': 'v2', 'created': 'Mon, 9 Dec 2019 15:41:13 GMT'}]
|
2019-12-10
|
[array(['Fleischer', 'Lukas', ''], dtype=object)
array(['Shallit', 'Jeffrey', ''], dtype=object)]
|
6,265 |
cond-mat/0402580
|
Markus Aichhorn
|
M. Aichhorn, H. G. Evertz, W. von der Linden, and M. Potthoff
|
Charge ordering in extended Hubbard models: Variational cluster approach
|
15 pages, 12 figures
|
PRB 70, 235107 (2004)
|
10.1103/PhysRevB.70.235107
| null |
cond-mat.str-el
| null |
We present a generalization of the recently proposed variational cluster
perturbation theory to extended Hubbard models at half filling with repulsive
nearest neighbor interaction. The method takes into account short-range
correlations correctly by the exact diagonalisation of clusters of finite size,
whereas long-range order beyond the size of the clusters is treated on a
mean-field level. For one dimension, we show that quantum Monte Carlo and
density-matrix renormalization-group results can be reproduced with very good
accuracy. Moreover we apply the method to the two-dimensional extended Hubbard
model on a square lattice. In contrast to the one-dimensional case, a first
order phase transition between spin density wave phase and charge density wave
phase is found as function of the nearest-neighbor interaction at onsite
interactions U>=3t. The single-particle spectral function is calculated for
both the one-dimensional and the two-dimensional system.
|
[{'version': 'v1', 'created': 'Tue, 24 Feb 2004 10:42:20 GMT'}]
|
2009-11-10
|
[array(['Aichhorn', 'M.', ''], dtype=object)
array(['Evertz', 'H. G.', ''], dtype=object)
array(['von der Linden', 'W.', ''], dtype=object)
array(['Potthoff', 'M.', ''], dtype=object)]
|
6,266 |
2205.05207
|
Sumit Goel
|
Sumit Goel
|
Prizes and effort in contests with private information
|
EC 2023
| null | null | null |
cs.GT econ.TH
|
http://creativecommons.org/licenses/by/4.0/
|
We consider contests where participants have private information about their
ability and the contest designer can manipulate the values of different prizes
to influence effort. We study the effect on effort of two different
interventions: increase in the value of prizes and increase in competition
(transfer of value from worse to better prizes). We identify two natural
sufficient conditions on the distribution of abilities in the population under
which both interventions have opposite effects on effort. More precisely, we
find that if the density of agents is decreasing in ability so that
unproductive agents are more likely than productive agents, the two
interventions encourage effort. And if this density is monotone increasing in
ability, the interventions discourage effort. We discuss applications to the
design of optimal contests in three different environments, including the
design of grading contests. Assuming the value of a grade is determined by the
information it reveals about the agent's ability, we establish a link between
the informativeness of a grading scheme and the effort induced by it.
|
[{'version': 'v1', 'created': 'Tue, 10 May 2022 23:11:09 GMT'}
{'version': 'v2', 'created': 'Tue, 5 Jul 2022 13:22:06 GMT'}
{'version': 'v3', 'created': 'Tue, 3 Jan 2023 17:40:56 GMT'}
{'version': 'v4', 'created': 'Sat, 20 May 2023 02:30:44 GMT'}]
|
2023-05-23
|
[array(['Goel', 'Sumit', ''], dtype=object)]
|
6,267 |
1505.07346
|
Ana Agore
|
A.L. Agore, G. Militaru
|
Galois groups and group actions on Lie algebras
|
final version
|
Journal of Lie Theory 28 (2018), 1165-1188
| null | null |
math.RA math-ph math.MP math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If $\mathfrak{g} \subseteq \mathfrak{h}$ is an extension of Lie algebras over
a field $k$ such that ${\rm dim}_k (\mathfrak{g}) = n$ and ${\rm dim}_k
(\mathfrak{h}) = n + m$, then the Galois group ${\rm Gal} \,
(\mathfrak{h}/\mathfrak{g})$ is explicitly described as a subgroup of the
canonical semidirect product of groups ${\rm GL} (m, \, k) \rtimes {\rm
M}_{n\times m} (k)$. An Artin type theorem for Lie algebras is proved: if a
group $G$ whose order isinvertible in $k$ acts as automorphisms on a Lie
algebra $\mathfrak{h}$, then $\mathfrak{h}$ is isomorphic to a skew crossed
product $\mathfrak{h}^G \, \#^{\bullet} \, V$, where $\mathfrak{h}^G$ is the
subalgebra of invariants and $V$ is the kernel of the Reynolds operator. The
Galois group ${\rm Gal} \,(\mathfrak{h}/\mathfrak{h}^G)$ is also computed,
highlighting the difference from the classical Galois theory of fields where
the corresponding group is $G$. The counterpart for Lie algebras of Hilbert's
Theorem 90 is proved and based on it the structure of Lie algebras
$\mathfrak{h}$ having a certain type of action of a finite cyclic group is
described. Radical extensions of finite dimensional Lie algebras are introduced
and it is shown that their Galois group is solvable. Several applications and
examples are provided.
|
[{'version': 'v1', 'created': 'Wed, 27 May 2015 14:37:04 GMT'}
{'version': 'v2', 'created': 'Thu, 28 May 2015 05:23:39 GMT'}
{'version': 'v3', 'created': 'Fri, 12 Oct 2018 04:32:37 GMT'}]
|
2018-10-15
|
[array(['Agore', 'A. L.', ''], dtype=object)
array(['Militaru', 'G.', ''], dtype=object)]
|
6,268 |
2107.08243
|
Neofytos Rodosthenous
|
Jos\'e Luis P\'erez, Neofytos Rodosthenous and Kazutoshi Yamazaki
|
Non-zero-sum optimal stopping game with continuous versus periodic
observations
|
34 pages, 6 figures
| null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a new non-zero-sum game of optimal stopping with asymmetric
information. Given a stochastic process modelling the value of an asset, one
player has full access to the information and observes the process completely,
while the other player can access it only periodically at independent Poisson
arrival times. The first one to stop receives a reward, different for each
player, while the other one gets nothing. We study how each player balances the
maximisation of gains against the maximisation of the likelihood of stopping
before the opponent. In such a setup, driven by a L\'evy process with positive
jumps, we not only prove the existence, but also explicitly construct a Nash
equilibrium with values of the game written in terms of the scale function.
Numerical illustrations with put-option payoffs are also provided to study the
behaviour of the players' strategies as well as the quantification of the value
of information.
|
[{'version': 'v1', 'created': 'Sat, 17 Jul 2021 14:14:01 GMT'}]
|
2021-07-20
|
[array(['Pérez', 'José Luis', ''], dtype=object)
array(['Rodosthenous', 'Neofytos', ''], dtype=object)
array(['Yamazaki', 'Kazutoshi', ''], dtype=object)]
|
6,269 |
2212.13717
|
Naoya Hatano
|
N. Hatano
|
Atomic decomposition for Morrey-Lorentz spaces
| null | null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the atomic decomposition for Morrey-Lorentz spaces
and applications. Morrey-Lorentz spaces, which have structures of Morrey
spaces, Lorentz spaces and their weak-type spaces, are introduced by M. A.
Ragusa in 2012. Our study gave some extension of the atomic decomposition to
Morrey-Lorentz spaces. As an application, the Olsen inequality can be obtained
more sharpness.
|
[{'version': 'v1', 'created': 'Wed, 28 Dec 2022 06:43:32 GMT'}]
|
2022-12-29
|
[array(['Hatano', 'N.', ''], dtype=object)]
|
6,270 |
2210.17159
|
Won-Yong Shin
|
Yong-Min Shin, Sun-Woo Kim, Won-Yong Shin
|
PAGE: Prototype-Based Model-Level Explanations for Graph Neural Networks
|
18 pages, 10 figures, 5 tables; its two-page extended summary was
presented in the AAAI-22 Student Abstract and Poster Program
| null | null | null |
cs.LG cs.AI cs.IT cs.NE cs.SI math.IT
|
http://creativecommons.org/licenses/by/4.0/
|
Aside from graph neural networks (GNNs) catching significant attention as a
powerful framework revolutionizing graph representation learning, there has
been an increasing demand for explaining GNN models. Although various
explanation methods for GNNs have been developed, most studies have focused on
instance-level explanations, which produce explanations tailored to a given
graph instance. In our study, we propose Prototype-bAsed GNN-Explainer (PAGE),
a novel model-level GNN explanation method that explains what the underlying
GNN model has learned for graph classification by discovering
human-interpretable prototype graphs. Our method produces explanations for a
given class, thus being capable of offering more concise and comprehensive
explanations than those of instance-level explanations. First, PAGE selects
embeddings of class-discriminative input graphs on the graph-level embedding
space after clustering them. Then, PAGE discovers a common subgraph pattern by
iteratively searching for high matching node tuples using node-level embeddings
via a prototype scoring function, thereby yielding a prototype graph as our
explanation. Using five graph classification datasets, we demonstrate that PAGE
qualitatively and quantitatively outperforms the state-of-the-art model-level
explanation method. We also carry out experimental studies systematically by
showing the relationship between PAGE and instance-level explanation methods,
the robustness of PAGE to input data scarce environments, and the computational
efficiency of the proposed prototype scoring function in PAGE.
|
[{'version': 'v1', 'created': 'Mon, 31 Oct 2022 09:10:06 GMT'}]
|
2022-11-01
|
[array(['Shin', 'Yong-Min', ''], dtype=object)
array(['Kim', 'Sun-Woo', ''], dtype=object)
array(['Shin', 'Won-Yong', ''], dtype=object)]
|
6,271 |
math/0104282
|
Mario J. Edmundo
|
Mario J. Edmundo
|
Covers of groups definable in o-minimal structures
|
69 pages, submited
| null | null | null |
math.LO math.AT
| null |
We develop in this paper the theory of covers for Hausdorff properly $\bigvee
$-definable manifolds with definable choice in an o-minimal structure $\N$. In
particular, we show that given an $\N$-definably connected $\N$-definable group
$G$ we have $1\to \pi_1(G)\to \tilde{G}\stackrel{p}\to G\to 1$ in the category
of strictly properly $\bigvee $-definable groups with strictly properly
$\bigvee $-definable homomorphisms, where $\pi_1(G)$ is the o-minimal
fundamental group of $G$.
|
[{'version': 'v1', 'created': 'Sun, 29 Apr 2001 16:32:30 GMT'}]
|
2007-05-23
|
[array(['Edmundo', 'Mario J.', ''], dtype=object)]
|
6,272 |
1510.01309
|
Issam Ibnouhsein
|
Issam Ibnouhsein
|
Quantum correlations and causal structures
|
155 pages, 11 figures, Ph.D. dissertation (2014). Updates mainly
consist of either the use of quotation marks or the rephrasing of technical
results when attribution was not clear. Remaining text overlap with papers by
other authors is primarily due to properly referenced verbatim reproductions
of mathematical definitions, technical proofs and figure captions
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent works in foundations of quantum (field) theory and relativistic
quantum information try to better grasp the interplay between the structure of
quantum correlations and the constraints imposed by causality on physical
operations. Chapter 1 is dedicated to the study of the conceptual implications
of quantum nonlocality, a concept that subsumes that of entanglement in a
certain way. We detail the recent information-theoretic approaches to
understanding the structure of nonlocal correlations, and the issues the latter
raise concerning the ability of local observers to isolate a system from its
environment. Chapter 2 reviews in what sense imposing Poincare invariance
affects entanglement detection and quantification procedures. This invariance
ultimately forces a description of all quantum systems within the framework of
quantum field theory, which leads to the impossibility of localized
finite-energy states and to the divergence of all entanglement measures for
local observers. We provide a solution to these two problems by showing that
there exists a generic equivalence between a finite spatial resolution of the
measurement apparatus and the exclusion of high-energy degrees of freedom from
the definition of the observed system. This equivalence allows for an epistemic
interpretation of the standard quantum formalism describing nonrelativistic
localized systems and their correlations, hence a clarification of the origin
of the finite measures of entanglement between such systems. Chapter 3 presents
a recent theoretical framework that predicts the existence of correlations with
indefinite causal order. In analogy to the information-theoretic approaches to
nonlocal correlations, we introduce some principles that constrain the
structure of such correlations, which is a first step toward a clear
understanding of their physical origin.
|
[{'version': 'v1', 'created': 'Mon, 5 Oct 2015 19:56:41 GMT'}
{'version': 'v2', 'created': 'Tue, 13 Oct 2015 19:13:21 GMT'}]
|
2015-10-14
|
[array(['Ibnouhsein', 'Issam', ''], dtype=object)]
|
6,273 |
1801.06993
|
Tuan Phung-Duc
|
Joris Walraevens, Dieter Claeys, Tuan Phung-Duc
|
Asymptotics of Queue Length Distributions in Priority Retrial Queues
|
Submitted for review
| null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate asymptotics of the distribution of the number of customers in
orbit in a two-class priority retrial $M/G/1$-type queueing model. In this
model, priority customers wait in line while non-priority customers join an
orbit and retry later. Although the generating function and moments of the
number of customers in orbit has been analyzed before, asymptotics of the
distribution have not been thoroughly investigated. We use singularity analysis
of the probability generating function to do just that. Our results show that
different regimes exist for these asymptotics in case of light-tailed service
times: in what we call the `priority regime', the tail asymptotics have the
same decay ($\sim cn^{-3/2}R^{-n}$) as in the priority non-retrial queue and
the retrial rate only influences the constant $c$. In the `retrial regime', the
retrial rate also influences the sub-exponential factor of the asymptotics. In
this regime, asymptotics are very similar to asymptotics in retrial queues
without (priority) waiting line. Finally, we also analyze the case that the
service time distribution is power law (with or without exponential cut-off)
using the same technique.
|
[{'version': 'v1', 'created': 'Mon, 22 Jan 2018 08:47:49 GMT'}]
|
2018-01-23
|
[array(['Walraevens', 'Joris', ''], dtype=object)
array(['Claeys', 'Dieter', ''], dtype=object)
array(['Phung-Duc', 'Tuan', ''], dtype=object)]
|
6,274 |
1610.04914
|
Dmitry Garanin
|
D. A. Garanin
|
Pulse-noise approach for classical spin systems
|
8 pages, 7 figure captions, to be published in PRE
|
Phys. Rev. E 95, 013306 (2017)
|
10.1103/PhysRevE.95.013306
| null |
cond-mat.stat-mech physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For systems of classical spins interacting with the bath via damping and
thermal noise, the approach is suggested to replace the white noise by a pulse
noise acting at regular time intervals $\Delta t$, within which the system
evolves conservatively. The method is working well in the typical case of a
small dimensionless damping constant $\lambda$ and allows a considerable
speed-up of computations by using high-order numerical integrators with a large
time step $\delta t$ (up to a fraction of the precession period), while keeping
$\delta t\ll\Delta t$ to reduce the relative contribution of noise-related
operations. In cases when precession can be discarded, $\delta t$ can be
increased up to a fraction of the relaxation time $\propto1/\lambda$ that leads
to a further speed-up. This makes equilibration speed comparable with that of
Metropolis Monte Carlo. The pulse-noise approach is tested on single-spin and
multi-spin models.
|
[{'version': 'v1', 'created': 'Sun, 16 Oct 2016 21:02:22 GMT'}
{'version': 'v2', 'created': 'Wed, 4 Jan 2017 14:55:19 GMT'}]
|
2017-01-25
|
[array(['Garanin', 'D. A.', ''], dtype=object)]
|
6,275 |
1707.01475
|
Th\'eo Trouillon
|
Th\'eo Trouillon and Maximilian Nickel
|
Complex and Holographic Embeddings of Knowledge Graphs: A Comparison
| null | null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Embeddings of knowledge graphs have received significant attention due to
their excellent performance for tasks like link prediction and entity
resolution. In this short paper, we are providing a comparison of two
state-of-the-art knowledge graph embeddings for which their equivalence has
recently been established, i.e., ComplEx and HolE [Nickel, Rosasco, and Poggio,
2016; Trouillon et al., 2016; Hayashi and Shimbo, 2017]. First, we briefly
review both models and discuss how their scoring functions are equivalent. We
then analyze the discrepancy of results reported in the original articles, and
show experimentally that they are likely due to the use of different loss
functions. In further experiments, we evaluate the ability of both models to
embed symmetric and antisymmetric patterns. Finally, we discuss advantages and
disadvantages of both models and under which conditions one would be preferable
to the other.
|
[{'version': 'v1', 'created': 'Wed, 5 Jul 2017 17:17:34 GMT'}
{'version': 'v2', 'created': 'Sun, 23 Jul 2017 04:30:21 GMT'}]
|
2017-07-25
|
[array(['Trouillon', 'Théo', ''], dtype=object)
array(['Nickel', 'Maximilian', ''], dtype=object)]
|
6,276 |
1904.11247
|
Andres Conca
|
Andres Conca, Alessia Niesen, G\"unter Reiss, and Burkard Hillebrands
|
Low damping magnetic properties and perpendicular magnetic anisotropy
with strong volume contribution in the Heusler alloy Fe1.5CoGe
|
5 pages, 5 figures
| null | null | null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of the dynamic magnetic properties of TiN-buffered
epitaxial thin films of the Heusler alloy Fe$_{1.5}$CoGe. Thickness series
annealed at different temperatures are prepared and the magnetic damping is
measured, a lowest value of $\alpha=2.18\times 10^{-3}$ is obtained. The
perpendicular magnetic anisotropy properties in Fe$_{1.5}$CoGe/MgO are also
characterized. The evolution of the interfacial perpendicular anisotropy
constant $K^{\perp}_{\rm S}$ with the annealing temperature is shown and
compared with the widely used CoFeB/MgO interface. A large volume contribution
to the perpendicular anisotropy of $(4.3\pm0.5)\times 10^{5}$ $\rm J/m^3$ is
also found, in contrast with vanishing bulk contribution in common Co- and
Fe-based Heusler alloys.
|
[{'version': 'v1', 'created': 'Thu, 25 Apr 2019 10:05:02 GMT'}]
|
2019-04-26
|
[array(['Conca', 'Andres', ''], dtype=object)
array(['Niesen', 'Alessia', ''], dtype=object)
array(['Reiss', 'Günter', ''], dtype=object)
array(['Hillebrands', 'Burkard', ''], dtype=object)]
|
6,277 |
2305.10535
|
Nawsad Ali
|
Nawsad Ali
|
Bulk Viscous Bianchi Type-V Cosmological Model with Time Function G and
Lambda
|
18 pages, 6 figures
| null | null | null |
gr-qc hep-th
|
http://creativecommons.org/licenses/by-sa/4.0/
|
In this paper we are to study homogeneous and anisotropic Bianchi type-V
universe in presence of bulk viscous fluid source of matter with time function
gravitational constant G and cosmological term lambda. The viscosity
coefficient is regarded as power function of matter density in the first case
whereas in other case it is considered as proportional to the scale of
expansion. Physical realistic solutions of the field equations are obtained by
using a fractional form of Hubble's parameter, which leads an early
deceleration and late time acceleration of the universe. Certain physical and
geometrical behaviors of the model are also studied.
|
[{'version': 'v1', 'created': 'Wed, 19 Apr 2023 23:33:28 GMT'}]
|
2023-05-19
|
[array(['Ali', 'Nawsad', ''], dtype=object)]
|
6,278 |
math/0407093
|
Henry Cohn
|
Henry Cohn
|
Projective geometry over F_1 and the Gaussian binomial coefficients
|
9 pages
|
American Mathematical Monthly 111 (2004), 487-495
| null | null |
math.CO
| null |
There is no field with only one element, yet there is a well-defined notion
of what projective geometry over such a field means. This notion is familiar to
experts and plays an interesting role behind the scenes in combinatorics and
algebra, but it is rarely discussed as such. The purpose of this article is to
bring it to the attention of a broader audience, as the solution to a puzzle
about Gaussian binomial coefficients.
|
[{'version': 'v1', 'created': 'Wed, 7 Jul 2004 01:38:47 GMT'}]
|
2007-05-23
|
[array(['Cohn', 'Henry', ''], dtype=object)]
|
6,279 |
2011.04463
|
Susana Lai-Yuen
|
Maria Baldeon Calisto and Susana Lai-Yuen
|
Neural Architecture Search with an Efficient Multiobjective Evolutionary
Framework
|
11 pages, 3 figures
| null | null | null |
cs.CV cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deep learning methods have become very successful at solving many complex
tasks such as image classification and segmentation, speech recognition and
machine translation. Nevertheless, manually designing a neural network for a
specific problem is very difficult and time-consuming due to the massive
hyperparameter search space, long training times, and lack of technical
guidelines for the hyperparameter selection. Moreover, most networks are highly
complex, task specific and over-parametrized. Recently, multiobjective neural
architecture search (NAS) methods have been proposed to automate the design of
accurate and efficient architectures. However, they only optimize either the
macro- or micro-structure of the architecture requiring the unset
hyperparameters to be manually defined, and do not use the information produced
during the optimization process to increase the efficiency of the search. In
this work, we propose EMONAS, an Efficient MultiObjective Neural Architecture
Search framework for the automatic design of neural architectures while
optimizing the network's accuracy and size. EMONAS is composed of a search
space that considers both the macro- and micro-structure of the architecture,
and a surrogate-assisted multiobjective evolutionary based algorithm that
efficiently searches for the best hyperparameters using a Random Forest
surrogate and guiding selection probabilities. EMONAS is evaluated on the task
of 3D cardiac segmentation from the MICCAI ACDC challenge, which is crucial for
disease diagnosis, risk evaluation, and therapy decision. The architecture
found with EMONAS is ranked within the top 10 submissions of the challenge in
all evaluation metrics, performing better or comparable to other approaches
while reducing the search time by more than 50% and having considerably fewer
number of parameters.
|
[{'version': 'v1', 'created': 'Mon, 9 Nov 2020 14:41:10 GMT'}]
|
2020-11-10
|
[array(['Calisto', 'Maria Baldeon', ''], dtype=object)
array(['Lai-Yuen', 'Susana', ''], dtype=object)]
|
6,280 |
1202.4787
|
Brankica \v{S}urlan
|
Brankica \v{S}urlan, Wolf-Rainer Hamann, Ji\v{r}\'i Kub\'at, Lidia M.
Oskinova, Achim Feldmeier
|
3-D radiative transfer in clumped hot star winds I. Influence of
clumping on the resonance line formation
|
Astronomy and Astrophysics, accepted for publication
| null |
10.1051/0004-6361/201118590
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The true mass-loss rates from massive stars are important for many branches
of astrophysics. For the correct modeling of the resonance lines, which are
among the key diagnostics of stellar mass-loss, the stellar wind clumping
turned out to be very important. In order to incorporate clumping into
radiative transfer calculation, 3-D models are required. Various properties of
the clumps may have strong impact on the resonance line formation and,
therefore, on the determination of empirical mass-loss rates. We incorporate
the 3-D nature of the stellar wind clumping into radiative transfer
calculations and investigate how different model parameters influence the
resonance line formation. We develop a full 3-D Monte Carlo radiative transfer
code for inhomogeneous expanding stellar winds. The number density of clumps
follows the mass conservation. For the first time, realistic 3-D models that
describe the dense as well as the tenuous wind components are used to model the
formation of resonance lines in a clumped stellar wind. At the same time,
non-monotonic velocity fields are accounted for. The 3-D density and velocity
wind inhomogeneities show very strong impact on the resonance line formation.
The different parameters describing the clumping and the velocity field results
in different line strengths and profiles. We present a set of representative
models for various sets of model parameters and investigate how the resonance
lines are affected. Our 3-D models show that the line opacity is reduced for
larger clump separation and for more shallow velocity gradients within the
clumps. Our new model demonstrates that to obtain empirically correct mass-loss
rates from the UV resonance lines, the wind clumping and its 3-D nature must be
taken into account.
|
[{'version': 'v1', 'created': 'Tue, 21 Feb 2012 22:56:59 GMT'}]
|
2015-06-04
|
[array(['Šurlan', 'Brankica', ''], dtype=object)
array(['Hamann', 'Wolf-Rainer', ''], dtype=object)
array(['Kubát', 'Jiří', ''], dtype=object)
array(['Oskinova', 'Lidia M.', ''], dtype=object)
array(['Feldmeier', 'Achim', ''], dtype=object)]
|
6,281 |
1902.02481
|
Xiuxian Li
|
Xiuxian Li and Gang Feng
|
Distributed Algorithms for Computing a Common Fixed Point of a Group of
Nonexpansive Operators
|
15 pages
| null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper addresses the problem of seeking a common fixed point for a
collection of nonexpansive operators over time-varying multi-agent networks in
real Hilbert spaces, where each operator is only privately and approximately
known to each individual agent, and all agents need to cooperate to solve this
problem by propagating their own information to their neighbors through local
communications over time-varying networks. To handle this problem, inspired by
the centralized inexact Krasnosel'ski\u{\i}-Mann (IKM) iteration, we propose a
distributed algorithm, called distributed inexact Krasnosel'ski\u{\i}-Mann
(D-IKM) iteration. It is shown that the D-IKM iteration can converge weakly to
a common fixed point of the family of nonexpansive operators. Moreover, under
the assumption that all operators and their own fixed point sets are
(boundedly) linearly regular, it is proved that the D-IKM iteration converges
with a rate $O(1/k^{\ln(1/\xi)})$ for some constant $\xi\in(0,1)$, where $k$ is
the iteration number. To reduce computational complexity and burden of storage
and transmission, a scenario, where only a random part of coordinates for each
agent is updated at each iteration, is further considered, and a corresponding
algorithm, named distributed inexact block-coordinate Krasnosel'ski\u{\i}-Mann
(D-IBKM) iteration, is developed. The algorithm is proved to be weakly
convergent to a common fixed point of the group of considered operators, and,
with the extra assumption of (bounded) linear regularity, it is convergent with
a rate $O(1/k^{\ln(1/\xi)})$. Furthermore, it is shown that the convergence
rate $O(1/k^{\ln(1/\xi)})$ can still be guaranteed under a more relaxed
(bounded) power regularity condition.
|
[{'version': 'v1', 'created': 'Thu, 7 Feb 2019 05:46:37 GMT'}]
|
2019-02-08
|
[array(['Li', 'Xiuxian', ''], dtype=object)
array(['Feng', 'Gang', ''], dtype=object)]
|
6,282 |
cond-mat/9709342
|
Stefan Kettemann
|
Stefan Kettemann
|
Transport through a Constriction in a FQH Annulus
|
6 pages, LaTeX, to be published in Physica E 1(1997), in the
proceedings of LOWDES '97
|
Physica E (1997), 92
|
10.1016/S1386-9477(97)00020-9
| null |
cond-mat.mes-hall
| null |
The composite fermion perspective is used, to study the flux dependence of
thermodynamic properties of an annulus in the fractional quantum hall state at
odd inverse filling factor.
It is shown that $\phi_0$- periodicity is restored, if there is tunneling of
composite fermions between the edges of the annulus.
In addition, the result for the finite magnitude of the persistent current
across a very strong constriction in the annulus is presented, as obtained from
an extension of Wen's edge state theory.
|
[{'version': 'v1', 'created': 'Tue, 30 Sep 1997 16:55:41 GMT'}]
|
2016-08-31
|
[array(['Kettemann', 'Stefan', ''], dtype=object)]
|
6,283 |
2306.03152
|
Justin Spilker
|
Justin S. Spilker, Kedar A. Phadke, Manuel Aravena, Melanie Archipley,
Matthew B. Bayliss, Jack E. Birkin, Matthieu Bethermin, James Burgoyne, Jared
Cathey, Scott C. Chapman, Hakon Dahle, Anthony H. Gonzalez, Gayathri
Gururajan, Christopher C. Hayward, Yashar D. Hezaveh, Ryley Hill, Taylor A.
Hutchison, Keunho J. Kim, Seonwoo Kim, David Law, Ronan Legin, Matthew A.
Malkan, Daniel P. Marrone, Eric J. Murphy, Desika Narayanan, Alex Navarre,
Grace M. Olivier, Jeffrey A. Rich, Jane R. Rigby, Cassie Reuter, James E.
Rhoads, Keren Sharon, J.D. T. Smith, Manuel Solimano, Nikolaus Sulzenauer,
Joaquin D. Vieira, Axel Weiss, Katherine E. Whitaker
|
Spatial variations in aromatic hydrocarbon emission in a dust-rich
galaxy
|
Published in Nature 5 June 2023 at
https://www.nature.com/articles/s41586-023-05998-6. MIRI MRS reduction
notebook is available at https://github.com/jwst-templates
| null |
10.1038/s41586-023-05998-6
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dust grains absorb half of the radiation emitted by stars throughout the
history of the universe, re-emitting this energy at infrared wavelengths.
Polycyclic aromatic hydrocarbons (PAHs) are large organic molecules that trace
millimeter-size dust grains and regulate the cooling of the interstellar gas
within galaxies. Observations of PAH features in very distant galaxies have
been difficult due to the limited sensitivity and wavelength coverage of
previous infrared telescopes. Here we present JWST observations that detect the
3.3um PAH feature in a galaxy observed less than 1.5 billion years after the
Big Bang. The high equivalent width of the PAH feature indicates that star
formation, rather than black hole accretion, dominates the infrared emission
throughout the galaxy. The light from PAH molecules, large dust grains, and
stars and hot dust are spatially distinct from one another, leading to
order-of-magnitude variations in the PAH equivalent width and the ratio of PAH
to total infrared luminosity across the galaxy. The spatial variations we
observe suggest either a physical offset between the PAHs and large dust grains
or wide variations in the local ultraviolet radiation field. Our observations
demonstrate that differences in the emission from PAH molecules and large dust
grains are a complex result of localized processes within early galaxies.
|
[{'version': 'v1', 'created': 'Mon, 5 Jun 2023 18:06:16 GMT'}]
|
2023-06-07
|
[array(['Spilker', 'Justin S.', ''], dtype=object)
array(['Phadke', 'Kedar A.', ''], dtype=object)
array(['Aravena', 'Manuel', ''], dtype=object)
array(['Archipley', 'Melanie', ''], dtype=object)
array(['Bayliss', 'Matthew B.', ''], dtype=object)
array(['Birkin', 'Jack E.', ''], dtype=object)
array(['Bethermin', 'Matthieu', ''], dtype=object)
array(['Burgoyne', 'James', ''], dtype=object)
array(['Cathey', 'Jared', ''], dtype=object)
array(['Chapman', 'Scott C.', ''], dtype=object)
array(['Dahle', 'Hakon', ''], dtype=object)
array(['Gonzalez', 'Anthony H.', ''], dtype=object)
array(['Gururajan', 'Gayathri', ''], dtype=object)
array(['Hayward', 'Christopher C.', ''], dtype=object)
array(['Hezaveh', 'Yashar D.', ''], dtype=object)
array(['Hill', 'Ryley', ''], dtype=object)
array(['Hutchison', 'Taylor A.', ''], dtype=object)
array(['Kim', 'Keunho J.', ''], dtype=object)
array(['Kim', 'Seonwoo', ''], dtype=object)
array(['Law', 'David', ''], dtype=object)
array(['Legin', 'Ronan', ''], dtype=object)
array(['Malkan', 'Matthew A.', ''], dtype=object)
array(['Marrone', 'Daniel P.', ''], dtype=object)
array(['Murphy', 'Eric J.', ''], dtype=object)
array(['Narayanan', 'Desika', ''], dtype=object)
array(['Navarre', 'Alex', ''], dtype=object)
array(['Olivier', 'Grace M.', ''], dtype=object)
array(['Rich', 'Jeffrey A.', ''], dtype=object)
array(['Rigby', 'Jane R.', ''], dtype=object)
array(['Reuter', 'Cassie', ''], dtype=object)
array(['Rhoads', 'James E.', ''], dtype=object)
array(['Sharon', 'Keren', ''], dtype=object)
array(['Smith', 'J. D. T.', ''], dtype=object)
array(['Solimano', 'Manuel', ''], dtype=object)
array(['Sulzenauer', 'Nikolaus', ''], dtype=object)
array(['Vieira', 'Joaquin D.', ''], dtype=object)
array(['Weiss', 'Axel', ''], dtype=object)
array(['Whitaker', 'Katherine E.', ''], dtype=object)]
|
6,284 |
1905.13710
|
Chris White
|
N. Bahjat-Abbas, D. Bonocore, J. Sinninghe Damst\'e, E. Laenen, L.
Magnea, L. Vernazza and C. D. White
|
Diagrammatic resummation of leading-logarithmic threshold effects at
next-to-leading power
|
48 pages, 8 figures
| null |
10.1007/JHEP11(2019)002
|
QMUL-PH-19-12, Nikhef/2019-015, MS-TP-19-08
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Perturbative cross-sections in QCD are beset by logarithms of kinematic
invariants, whose arguments vanish when heavy particles are produced near
threshold. Contributions of this type often need to be summed to all orders in
the coupling, in order to improve the behaviour of the perturbative expansion,
and it has long been known how to do this at leading power in the threshold
variable, using a variety of approaches. Recently, the problem of extending
this resummation to logarithms suppressed by a single power of the threshold
variable has received considerable attention. In this paper, we show that such
next-to-leading power (NLP) contributions can indeed be resummed, to leading
logarithmic (LL) accuracy, for any QCD process with a colour-singlet final
state, using a direct generalisation of the diagrammatic methods available at
leading power. We compare our results with other approaches, and comment on the
implications for further generalisations beyond leading-logarithmic accuracy.
|
[{'version': 'v1', 'created': 'Fri, 31 May 2019 16:41:14 GMT'}]
|
2020-01-08
|
[array(['Bahjat-Abbas', 'N.', ''], dtype=object)
array(['Bonocore', 'D.', ''], dtype=object)
array(['Damsté', 'J. Sinninghe', ''], dtype=object)
array(['Laenen', 'E.', ''], dtype=object)
array(['Magnea', 'L.', ''], dtype=object)
array(['Vernazza', 'L.', ''], dtype=object)
array(['White', 'C. D.', ''], dtype=object)]
|
6,285 |
1710.05235
|
Leonid Sirota
|
E. Ostrovsky, L. Sirota
|
Moment and tail estimates and Banach space valued Non-Central Limit
Theorem (NCLT) for sums of multi-indexed random variables, processes and
fields
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive in this preprint the moment and exponential tail estimates,
sufficient conditions for the Non-Central Limit Theorem (NCLT) in the ordinary
one-dimensional space as well as in the space of continuous functions for the
properly (natural) normalized multi-indexed sums of function of random
variables, processes or fields (r.f.), on the other words V-statistics,
parametric, in general case.
We construct also some examples in order to show the exactness of obtained
estimates.
We will use the theory of the so-called degenerate approximation of the
functions of several variables as well as the theory of
Grand Lebesgue Spaces (GLS) of measurable functions (random variables).
|
[{'version': 'v1', 'created': 'Sat, 14 Oct 2017 20:45:51 GMT'}]
|
2017-10-17
|
[array(['Ostrovsky', 'E.', ''], dtype=object)
array(['Sirota', 'L.', ''], dtype=object)]
|
6,286 |
1710.05820
|
Christoph Peter Hofmann
|
Christoph P. Hofmann
|
Quark Condensate in a Weak Magnetic Field
|
17 pages, 1 figure
|
Phys. Rev. D 99, 014030 (2019)
|
10.1103/PhysRevD.99.014030
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The low-temperature representation for the quark condensate in a weak
magnetic field $H$ is known up to two-loop order. Remarkably, at one-loop
order, the published series for the quark condensate in the chiral limit and $H
\ll T^2$ are inconsistent. Using an alternative representation for the
kinematical Bose functions, we derive the series to arbitrary order in $H/T^2$,
and also determine which of the published results is correct.
|
[{'version': 'v1', 'created': 'Mon, 16 Oct 2017 16:35:13 GMT'}]
|
2019-01-23
|
[array(['Hofmann', 'Christoph P.', ''], dtype=object)]
|
6,287 |
2004.07771
|
John Klauder
|
John R. Klauder
|
Quantum Gravity, Constant Negative Curvatures, and Black Holes
|
9 pages: affine quantization; quantum gravity; constant fixed
curvatures; black holes; acknowledgement added; minor correction
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For purposes of quantization, classical gravity is normally expressed by
canonical variables, namely the metric $g_{ab}(x)$ and the momentum
$\pi^{cd}(x)$. Canonical quantization requires a proper promotion of these
classical variables to quantum operators, which, according to Dirac, the
favored operators should be those arising from classical variables that formed
Cartesian coordinates; sadly, in this case, that is not possible. However, an
affine quantization features promoting the metric $g_{ab}(x)$ and the momentric
$\pi^c_d(x)\;[\equiv \pi^{ce}(x) \,g_{de}(x)]$ to operators. Instead of these
classical variables belonging to a constant zero curvature space (i.e., instead
of a flat space), they belong to a space of constant negative curvatures. This
feature may even have its appearance in black holes, which could strongly point
toward an affine quantization approach to quantize gravity.
|
[{'version': 'v1', 'created': 'Thu, 16 Apr 2020 17:06:00 GMT'}
{'version': 'v2', 'created': 'Mon, 20 Apr 2020 22:54:04 GMT'}]
|
2020-04-22
|
[array(['Klauder', 'John R.', ''], dtype=object)]
|
6,288 |
2006.15713
|
Saad Nadeem
|
Sadegh R Alam, Tianfang Li, Pengpeng Zhang, Si-Yuan Zhang, and Saad
Nadeem
|
Generalizable Cone Beam CT Esophagus Segmentation Using Physics-Based
Data Augmentation
|
Accepted to Physics in Medicine & Biology 2021
| null | null | null |
eess.IV cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Automated segmentation of esophagus is critical in image guided/adaptive
radiotherapy of lung cancer to minimize radiation-induced toxicities such as
acute esophagitis. We developed a semantic physics-based data augmentation
method for segmenting esophagus in both planning CT (pCT) and cone-beam CT
(CBCT) using 3D convolutional neural networks. 191 cases with their pCT and
CBCTs from four independent datasets were used to train a modified 3D-Unet
architecture with a multi-objective loss function specifically designed for
soft-tissue organs such as esophagus. Scatter artifacts and noise were
extracted from week 1 CBCTs using power law adaptive histogram equalization
method and induced to the corresponding pCT followed by reconstruction using
CBCT reconstruction parameters. Moreover, we leverage physics-based artifact
induced pCTs to drive the esophagus segmentation in real weekly CBCTs.
Segmentations were evaluated using geometric Dice and Hausdorff distance as
well as dosimetrically using mean esophagus dose and D5cc. Due to the
physics-based data augmentation, our model trained just on the synthetic CBCTs
was robust and generalizable enough to also produce state-of-the-art results on
the pCTs and CBCTs, achieving 0.81 and 0.74 Dice overlap. Our physics-based
data augmentation spans the realistic noise/artifact spectrum across patient
CBCT/pCT data and can generalize well across modalities with the potential to
improve the accuracy of treatment setup and response analysis.
|
[{'version': 'v1', 'created': 'Sun, 28 Jun 2020 21:12:09 GMT'}
{'version': 'v2', 'created': 'Sat, 30 Jan 2021 22:33:15 GMT'}]
|
2021-02-02
|
[array(['Alam', 'Sadegh R', ''], dtype=object)
array(['Li', 'Tianfang', ''], dtype=object)
array(['Zhang', 'Pengpeng', ''], dtype=object)
array(['Zhang', 'Si-Yuan', ''], dtype=object)
array(['Nadeem', 'Saad', ''], dtype=object)]
|
6,289 |
1410.7394
|
Petchara Pattarakijwanich
|
Petchara Pattarakijwanich, Michael A. Strauss, Shirley Ho, Nicholas P.
Ross
|
The Evolution of Post-Starburst Galaxies from $z\sim1$ to the Present
|
26 pages, 24 figures, 8 tables. Accepted for publication in The
Astrophysical Journal
| null |
10.3847/0004-637X/833/1/19
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Post-starburst galaxies are in the transitional stage between blue,
star-forming galaxies and red, quiescent galaxies, and therefore hold important
clues for our understanding of galaxy evolution. In this paper, we
systematically searched for and identified a large sample of post-starburst
galaxies from the spectroscopic dataset of the Sloan Digital Sky Survey (SDSS)
Data Release 9. In total, we found more than 6000 objects with redshifts
between $z\sim0.05$ and $z\sim1.3$, making this the largest sample of
post-starburst galaxies in the literature. We calculated the luminosity
function of the post-starburst galaxies using two uniformly selected
subsamples: the SDSS Main Galaxy Sample and the Baryon Oscillation
Spectroscopic Survey CMASS Sample. The luminosity functions are reasonably fit
by half-Gaussian functions. The peak magnitudes shift as a function of redshift
from $M\sim-23.5$ at $z\sim0.8$ to $M\sim-20.3$ at $z\sim0.1$. This is
consistent with the downsizing trend, whereby more massive galaxies form
earlier than low-mass galaxies. We compared the mass of the post-starburst
stellar population found in our sample to the decline of the global
star-formation rate and found that only a small amount ($\sim1\%$) of all
star-formation quenching in the redshift range $z=0.2-0.7$ results in
post-starburst galaxies in the luminosity range our sample is sensitive to.
Therefore, luminous post-starburst galaxies are not the place where most of the
decline in star-formation rate of the universe is happening.
|
[{'version': 'v1', 'created': 'Mon, 27 Oct 2014 20:00:12 GMT'}
{'version': 'v2', 'created': 'Mon, 15 Aug 2016 17:25:55 GMT'}]
|
2017-02-15
|
[array(['Pattarakijwanich', 'Petchara', ''], dtype=object)
array(['Strauss', 'Michael A.', ''], dtype=object)
array(['Ho', 'Shirley', ''], dtype=object)
array(['Ross', 'Nicholas P.', ''], dtype=object)]
|
6,290 |
math/0612153
|
Alexander Sakhnovich
|
Andrey Tydnyuk
|
Rational Solution of the KZ equation (example)
| null | null | null | null |
math.CA
| null |
We investigate the Knizhnik-Zamolodchikov linear differential system. The
coefficients of this system are rational functions. We prove that the solution
of the KZ system is rational when $k$ is equal to two and $n$ is equal to
three. While doing so, we found the coefficients of expansion in a neighborhood
of a singular point.
|
[{'version': 'v1', 'created': 'Wed, 6 Dec 2006 13:43:56 GMT'}]
|
2007-05-23
|
[array(['Tydnyuk', 'Andrey', ''], dtype=object)]
|
6,291 |
1810.00198
|
Shantanu Desai
|
Sajal Gupta, Shantanu Desai
|
Limit on graviton mass using stacked galaxy cluster catalogs from
SPT-SZ, Planck-SZ and SDSS-redMaPPer
|
6 pages, 2 figures
|
Annals of Physics 399, 85 (2018)
|
10.1016/j.aop.2018.09.017
| null |
astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the last few years, there has been a resurgence of interest in obtaining
observational bounds on the graviton mass, following the detection of
gravitational waves, because of the versatility of massive graviton theories in
resolving multiple problems in cosmology and fundamental physics. In this work,
we apply the method proposed in Rana et al.(arXiv:1801.03309), which consists
of looking for Yukawa-like fall off in the gravitational potential, to stacked
galaxy cluster catalogs from three disparate surveys. These include catalogs
from 2500 sq. degree SPT-SZ survey, the Planck all-sky SZ catalog, and a
redMaPPer selected catalog from 10,000 sq. degree of SDSS-DR8 data. The 90\%
c.l. limits which we obtained on the graviton mass using SPT, Planck and SDSS
are: $m_g < 4.73 \times 10^{-30}$ eV, $3.0 \times 10^{-30}$ eV, and $1.27
\times 10^{-30}$ eV respectively; or in terms of Compton wavelength are
$\lambda_g >2.62 \times 10^{20}$ km, $4.12 \times 10^{20}$ km, $9.76 \times
10^{20}$ km. These limits are about five times more stringent than the previous
best bound from galaxy clusters.
|
[{'version': 'v1', 'created': 'Sat, 29 Sep 2018 12:01:53 GMT'}]
|
2018-10-30
|
[array(['Gupta', 'Sajal', ''], dtype=object)
array(['Desai', 'Shantanu', ''], dtype=object)]
|
6,292 |
2102.04399
|
Augustine Mavor-Parker
|
Augustine N. Mavor-Parker, Kimberly A. Young, Caswell Barry, Lewis D.
Griffin
|
Escaping Stochastic Traps with Aleatoric Mapping Agents
|
Previously Presented at the NeurIPS (2020) Biological and Artificial
Reinforcement Learning Workshop
| null | null | null |
cs.LG cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Exploration in environments with sparse rewards is difficult for artificial
agents. Curiosity driven learning -- using feed-forward prediction errors as
intrinsic rewards -- has achieved some success in these scenarios, but fails
when faced with action-dependent noise sources. We present aleatoric mapping
agents (AMAs), a neuroscience inspired solution modeled on the cholinergic
system of the mammalian brain. AMAs aim to explicitly ascertain which dynamics
of the environment are unpredictable, regardless of whether those dynamics are
induced by the actions of the agent. This is achieved by generating separate
forward predictions for the mean and variance of future states and reducing
intrinsic rewards for those transitions with high aleatoric variance. We show
AMAs are able to effectively circumvent action-dependent stochastic traps that
immobilise conventional curiosity driven agents. The code for all experiments
presented in this paper is open sourced:
http://github.com/self-supervisor/Escaping-Stochastic-Traps-With-Aleatoric-Mapping-Agents.
|
[{'version': 'v1', 'created': 'Mon, 8 Feb 2021 18:05:08 GMT'}
{'version': 'v2', 'created': 'Fri, 8 Oct 2021 15:13:27 GMT'}]
|
2021-10-11
|
[array(['Mavor-Parker', 'Augustine N.', ''], dtype=object)
array(['Young', 'Kimberly A.', ''], dtype=object)
array(['Barry', 'Caswell', ''], dtype=object)
array(['Griffin', 'Lewis D.', ''], dtype=object)]
|
6,293 |
1505.02849
|
Takayasu Sekihara
|
Takayasu Sekihara (RCNP, Osaka U.)
|
$\Xi (1690)$ as a $\bar{K} \Sigma$ molecular state
|
10 pages, 3 eps files, version accepted for publication in PTEP
| null |
10.1093/ptep/ptv129
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a $\Xi ^{\ast}$ pole can be dynamically generated near the
$\bar{K} \Sigma$ threshold as an $s$-wave $\bar{K} \Sigma$ molecular state in a
coupled-channels unitary approach with the leading-order chiral interaction.
This $\Xi ^{\ast}$ state can be identified with the $\Xi (1690)$ resonance with
$J^{P} = 1/2^{-}$. We find that the experimental $\bar{K}^{0} \Lambda$ and
$K^{-} \Sigma ^{+}$ mass spectra are qualitatively reproduced with the $\Xi
^{\ast}$ state. Moreover we theoretically investigate properties of the
dynamically generated $\Xi ^{\ast}$ state.
|
[{'version': 'v1', 'created': 'Tue, 12 May 2015 01:35:09 GMT'}
{'version': 'v2', 'created': 'Wed, 29 Jul 2015 13:15:48 GMT'}
{'version': 'v3', 'created': 'Tue, 18 Aug 2015 02:22:21 GMT'}]
|
2015-09-30
|
[array(['Sekihara', 'Takayasu', '', 'RCNP, Osaka U.'], dtype=object)]
|
6,294 |
math/0409429
|
Sebastian Roch
|
S. Roch
|
Bounding Fastest Mixing
|
20 pages
| null | null | null |
math.PR cs.DM math.CO math.ST stat.TH
| null |
In a series of recent works, Boyd, Diaconis, and their co-authors have
introduced a semidefinite programming approach for computing the fastest mixing
Markov chain on a graph of allowed transitions, given a target stationary
distribution. In this paper, we show that standard mixing-time analysis
techniques--variational characterizations, conductance, canonical paths--can be
used to give simple, nontrivial lower and upper bounds on the fastest mixing
time. To test the applicability of this idea, we consider several detailed
examples including the Glauber dynamics of the Ising model--and get sharp
bounds.
|
[{'version': 'v1', 'created': 'Wed, 22 Sep 2004 12:32:25 GMT'}]
|
2011-09-07
|
[array(['Roch', 'S.', ''], dtype=object)]
|
6,295 |
1107.1725
|
Borkova Tatyana Viktorovna
|
V.A.Marsakov, V.V.Koval', T.V.Borkova and M.V.Shapovalov
|
The Age-Metallicity Relation in the Thin Disk of the Galaxy
|
16 page, 7 figures, accepted 2011, Astron. Rep., v.55, No.8,
p.667-682
| null |
10.1134/S1063772911080063
| null |
astro-ph.GA astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
HST trigonometric distances, photometric metallicities, isochronic ages from
the second revised version of the Geneva--Copenhagen survey, and uniform
spectroscopic Fe and Mg abundances from our master catalog are used to
construct and analyze the age--metallicity and age-relative Mg abundance
relations for stars of the thin disk. The influences of selection effects are
discussed in detail. It is demonstrated that the radial migration of stars does
not lead to appreciable distortions in the age dependence of the metallicity.
During the first several billion years of the formation of the thin disk, the
interstellar material in this disk was, on average, fairly rich in heavy
elements (<[Fe/H]> ~-0.2) and poorly mixed. However, the metallicity dispersion
continuously decreased with age, from \sigma_{[Fe/H]}~0.22 to ~0.13. All this
time, the mean relative abundance of Mg was somewhat higher than the solar
value (<[Mg/Fe]>~0.1). Roughly four to five billion years ago, the mean
metallicity began to systematically increase, while retaining the same
dispersion; the mean relative Mg abundance began to decrease immediately
following this. The number of stars in this subsystem increased sharply at the
same time. These properties suggest that the star-formation rate was low in the
initial stage of formation of the thin disk, but abruptly increased about four
to five billion years ago.
|
[{'version': 'v1', 'created': 'Fri, 8 Jul 2011 20:17:00 GMT'}]
|
2015-05-28
|
[array(['Marsakov', 'V. A.', ''], dtype=object)
array(["Koval'", 'V. V.', ''], dtype=object)
array(['Borkova', 'T. V.', ''], dtype=object)
array(['Shapovalov', 'M. V.', ''], dtype=object)]
|
6,296 |
2003.09181
|
Zhan-Wei Liu
|
Zhan-Wei Liu, Jia-Jun Wu, Derek B. Leinweber, Anthony W. Thomas
|
Kaonic Hydrogen and Deuterium in Hamiltonian Effective Field Theory
|
7 pages, 3 figures, published version
|
Phys. Lett. B 808 (2020) 135652
|
10.1016/j.physletb.2020.135652
|
ADP-20-8/T1118
|
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The anti-kaon nucleon scattering lengths resulting from a Hamiltonian
effective field theory analysis of experimental data and lattice QCD studies
are presented. The same Hamiltonian is then used to compute the scattering
length for the $K^- d$ system, taking careful account of the effects of recoil
on the energy at which the $\bar{K}N$ T-matrices are evaluated. These results
are then used to estimate the shift and width of the $1S$ levels of anti-kaonic
hydrogen and deuterium. The $K^- p$ result is in excellent agreement with the
SIDDHARTA measurement. In the $K^- d$ case the imaginary part of the scattering
length and consequently the width of the $1S$ state are considerably larger
than found in earlier work. This is a consequence of the effect of recoil on
the energy of the $\bar{K}N$ energy, which enhances the role of the
$\Lambda(1405)$ resonance.
|
[{'version': 'v1', 'created': 'Fri, 20 Mar 2020 10:37:47 GMT'}
{'version': 'v2', 'created': 'Wed, 29 Jul 2020 04:33:51 GMT'}]
|
2020-07-30
|
[array(['Liu', 'Zhan-Wei', ''], dtype=object)
array(['Wu', 'Jia-Jun', ''], dtype=object)
array(['Leinweber', 'Derek B.', ''], dtype=object)
array(['Thomas', 'Anthony W.', ''], dtype=object)]
|
6,297 |
1103.2265
|
Peter Mayr
|
Erhard Aichinger, Peter Mayr, Ralph McKenzie
|
On the number of finite algebraic structures
|
Added Corollary 6.5
| null | null | null |
math.RA math.GR math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that every clone of operations on a finite set A, if it contains a
Malcev operation, is finitely related -- i.e., identical with the clone of all
operations respecting R for some finitary relation R over A. It follows that
for a fixed finite set A, the set of all such Malcev clones is countable. This
completes the solution of a problem that was first formulated in 1980, or
earlier: how many Malcev clones can finite sets support? More generally, we
prove that every finite algebra with few subpowers has a finitely related clone
of term operations. Hence modulo term equivalence and a renaming of the
elements, there are only countably many finite algebras with few subpowers, and
thus only countably many finite algebras with a Malcev term.
|
[{'version': 'v1', 'created': 'Fri, 11 Mar 2011 13:42:51 GMT'}
{'version': 'v2', 'created': 'Mon, 30 May 2011 17:17:49 GMT'}]
|
2011-05-31
|
[array(['Aichinger', 'Erhard', ''], dtype=object)
array(['Mayr', 'Peter', ''], dtype=object)
array(['McKenzie', 'Ralph', ''], dtype=object)]
|
6,298 |
1604.07033
|
Arkadiusz Hypki Dr
|
Arkadiusz Hypki (1, 2), Mirek Giersz (2) ((1) Sterrewacht Leiden, (2)
N. Copernicus Astronomical Center)
|
MOCCA code for star cluster simulations - V. Initial globular cluster
conditions influence on blue stragglers
|
submitted to MNRAS, comments are welcome
| null |
10.1093/mnras/stw3099
| null |
astro-ph.GA astro-ph.IM physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper presents an analysis of properties of populations of blue
stragglers (BSs) in evolving globular clusters, based on numerical simulations
done with the MOCCA code for various initial globular clusters conditions.
We find that various populations of BSs strongly depend on the initial
semi-major axes distributions. With a significant number of compact binaries,
the number of evolutionary BSs can be also significant. In turn, for semi-major
axes distributions preferring binaries with wider orbits, dynamical BSs are the
dominant ones. Their formation scenario is very distinct: for wide binaries the
number of dynamical interactions is significantly larger. Most interactions are
weak and increase only slightly the eccentricities. However, due to a large
number of such interactions, the eccentricities of a number of binaries finally
get so large that the stars collide.
We study how larger initial clusters' concentrations influence the BSs.
Besides the expected increase of the number of dynamically created BSs (for
denser GCs the probabilities of strong dynamical interactions and collisions
are higher), we find that the number of the evolutionary BSs is not affected
even by very high initial concentrations. This has a very important implication
on observations - it supports the theory that the evolutionary BSs are the
result of the unperturbed evolution of the primordial binaries.
In addition, the paper presents the evolution of the ratio between the number
of BSs in binaries and as single stars R_B/S. For a vast diversity of models,
the ratio R_B/S approaches the value ~0.4. Additionally, we identified two
subgroups which differ in the initial semi-major axes distributions. The first
group starts with a high ratio R_B/S, it decreases with time and settles around
0.4. The second group starts with lower values of the ratio R_B/S ... . (etc.,
abstract continues)
|
[{'version': 'v1', 'created': 'Sun, 24 Apr 2016 13:57:03 GMT'}]
|
2017-01-18
|
[array(['Hypki', 'Arkadiusz', ''], dtype=object)
array(['Giersz', 'Mirek', ''], dtype=object)]
|
6,299 |
astro-ph/9802311
|
Melinda Weil
|
M.L. Weil (Columbia University), V.R. Eke and G. Efstathiou (Institute
of Astronomy, Cambridge)
|
Formation of Disc Galaxies
|
19 pages, LaTeX, MNRAS format, 14 inlined and 2 external Postscript
figures. Submitted to MNRAS
| null |
10.1046/j.1365-8711.1998.01931.x
| null |
astro-ph
| null |
We investigate the influence of the cooling epoch on the formation of
galaxies in a cold dark matter dominated universe. Isolated haloes, with
circular speeds typical of spiral galaxies, have been selected from a low
resolution numerical simulation for re-simulation at higher resolution with
dark matter and gas components. The initial conditions are evolved with two
smoothed particle hydrodynamics codes, TREESPH and GRAPESPH. In previous SPH
simulations, strong outward transport of angular momentum has led to the
formation of disc-like systems with much smaller angular momenta than observed
in real disc galaxies. Here we investigate whether this problem can be
circumvented if feedback processes prevent disc formation until late epochs.
The results of varying the cooling epoch for each of five different haloes are
analysed. When cooling and star formation occur at early times, stellar discs
are destroyed during merger events and we observe similar catastrophic
transport of angular momentum as seen in previous work. With cooling suppressed
until z=1, discs can form by the present day with angular momenta comparable to
those of observed disc galaxies. We conclude that feedback processes, which
prevent gas from collapsing until late epochs, are an essential ingredient in
disc galaxy formation.
|
[{'version': 'v1', 'created': 'Tue, 24 Feb 1998 16:00:49 GMT'}]
|
2015-06-24
|
[array(['Weil', 'M. L.', '', 'Columbia University'], dtype=object)
array(['Eke', 'V. R.', '', 'Institute\n of Astronomy, Cambridge'],
dtype=object)
array(['Efstathiou', 'G.', '', 'Institute\n of Astronomy, Cambridge'],
dtype=object) ]
|
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