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|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
4,000 |
2304.11750
|
Zhijun Liu
|
Zhijun Liu, Yiwei Guo, Kai Yu
|
DiffVoice: Text-to-Speech with Latent Diffusion
|
Accepted to ICASSP2023
| null | null | null |
eess.AS cs.AI cs.HC cs.LG cs.SD
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we present DiffVoice, a novel text-to-speech model based on
latent diffusion. We propose to first encode speech signals into a phoneme-rate
latent representation with a variational autoencoder enhanced by adversarial
training, and then jointly model the duration and the latent representation
with a diffusion model. Subjective evaluations on LJSpeech and LibriTTS
datasets demonstrate that our method beats the best publicly available systems
in naturalness. By adopting recent generative inverse problem solving
algorithms for diffusion models, DiffVoice achieves the state-of-the-art
performance in text-based speech editing, and zero-shot adaptation.
|
[{'version': 'v1', 'created': 'Sun, 23 Apr 2023 21:05:33 GMT'}]
|
2023-04-25
|
[array(['Liu', 'Zhijun', ''], dtype=object)
array(['Guo', 'Yiwei', ''], dtype=object)
array(['Yu', 'Kai', ''], dtype=object)]
|
4,001 |
2206.13253
|
Luis Felipe Prieto-Mart\'inez
|
Luis Felipe Prieto-Mart\'inez
|
The relation between symmetries and coincidence and collinearity of
polygon centers and centers of multisets of points in the plane
| null | null | null | null |
math.MG math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There are several remarkable points, defined for polygons and multisets of
points in the plane, called centers (such as the centroid). To make possible
their study, there exists a formal definition for the concept of center in both
cases. In this paper, the relation between symmetries of polygons and multisets
of points in the plane and the coincidence and collinearity of their centers is
studied. First, a precise statement for the problem is given. Then, it is
proved that, given a polygon or a multiset of points in the plane, a given
point in the plane is a center for this object if and only if it belongs to the
set of points fixed by its group of symmetries.
|
[{'version': 'v1', 'created': 'Mon, 6 Jun 2022 14:30:05 GMT'}]
|
2022-06-28
|
[array(['Prieto-Martínez', 'Luis Felipe', ''], dtype=object)]
|
4,002 |
hep-th/0201059
|
Constantin Bizdadea
|
C. Bizdadea
|
Note on two-dimensional nonlinear gauge theories
|
12 pages, LaTeX 2.e
|
Mod.Phys.Lett. A15 (2000) 2047-2055
|
10.1142/S0217732300002607
| null |
hep-th
| null |
A two-dimensional nonlinear gauge theory that can be proposed for
generalization to higher dimensions is derived by means of cohomological
arguments.
|
[{'version': 'v1', 'created': 'Wed, 9 Jan 2002 13:48:45 GMT'}]
|
2009-11-07
|
[array(['Bizdadea', 'C.', ''], dtype=object)]
|
4,003 |
2108.00103
|
Alexander Grushin
|
Alexander Grushin and Walt Woods
|
Anomaly Detection with Neural Parsers That Never Reject
|
10 pages, 3 figures
|
Proceedings of the 2022 IEEE Security and Privacy Workshops (SPW)
(2022) 88-97
| null | null |
cs.LG cs.FL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Reinforcement learning has recently shown promise as a technique for training
an artificial neural network to parse sentences in some unknown format, through
a body of work known as RL-GRIT. A key aspect of the RL-GRIT approach is that
rather than explicitly inferring a grammar that describes the format, the
neural network learns to perform various parsing actions (such as merging two
tokens) over a corpus of sentences, with the goal of maximizing the estimated
frequency of the resulting parse structures. This can allow the learning
process to more easily explore different action choices, since a given choice
may change the optimality of the parse (as expressed by the total reward), but
will not result in the failure to parse a sentence. However, this also presents
a limitation: because the trained neural network can successfully parse any
sentence, it cannot be directly used to identify sentences that deviate from
the format of the training sentences, i.e., that are anomalous. In this paper,
we address this limitation by presenting procedures for extracting production
rules from the neural network, and for using these rules to determine whether a
given sentence is nominal or anomalous. When a sentence is anomalous, an
attempt is made to identify the location of the anomaly. We empirically
demonstrate that our approach is capable of grammatical inference and anomaly
detection for both non-regular formats and those containing regions of high
randomness/entropy. While a format with high randomness typically requires
large sets of production rules, we propose a two pass grammatical inference
method to generate parsimonious rule sets for such formats. By further
improving parser learning, and leveraging the presented rule extraction and
anomaly detection algorithms, one might begin to understand common errors,
either benign or malicious, in practical formats.
|
[{'version': 'v1', 'created': 'Fri, 30 Jul 2021 23:10:24 GMT'}
{'version': 'v2', 'created': 'Fri, 20 May 2022 21:05:46 GMT'}]
|
2022-05-24
|
[array(['Grushin', 'Alexander', ''], dtype=object)
array(['Woods', 'Walt', ''], dtype=object)]
|
4,004 |
hep-ph/9412361
|
Paul Langacker
|
Paul Langacker
|
Tests of the Standard Model and Searches for New Physics
|
68 pages. Latex. Full text with 26 embedded figures available as
gzipped postscript file by anonymous ftp at
ftp://dept.physics.upenn.edu/pub/Langacker/bsm.ps.gz
| null |
10.1142/9789814503662_0022
| null |
hep-ph
| null |
The implications of precision $Z$ and $W$-pole and neutral current data for
testing the standard electroweak model, determining its parameters, and
searching for new physics, are described.
|
[{'version': 'v1', 'created': 'Thu, 22 Dec 1994 19:12:31 GMT'}]
|
2016-11-03
|
[array(['Langacker', 'Paul', ''], dtype=object)]
|
4,005 |
1205.5897
|
Masud Mansuripur
|
Masud Mansuripur, Armis R. Zakharian, and Ewan M. Wright
|
Spin and Orbital Angular Momenta of Light Reflected from a Cone
|
17 pages, 11 figures, 25 references
|
Physical Review A 84, 033813 (2011)
|
10.1103/PhysRevA.84.033813
| null |
physics.optics physics.class-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine several retro-reflecting optical elements, each involving two
reflections. In the case of a hollow metallic cone having an apex angle of
90\degree, a circularly-polarized incident beam acquires, upon reflection, the
opposite spin angular momentum. However, no angular momentum is transferred to
the cone, because the reflected beam picks up an orbital angular momentum that
is twice as large but opposite in direction to that of its spin. A 90\degree
cone made of a transparent material in which the incident light suffers two
total internal reflections before returning, may be designed to endow the
retro-reflected beam with different mixtures of orbital and spin angular
momenta. Under no circumstances, however, is it possible to transfer angular
momentum from the light beam to the cone without either allowing absorption or
breaking the axial symmetry of the cone. A simple example of broken symmetry is
provided by a wedge-shaped metallic reflector having an apex angle of
90\degree, which picks up angular momentum upon reflecting a
circularly-polarized incident beam.
|
[{'version': 'v1', 'created': 'Sat, 26 May 2012 17:09:26 GMT'}]
|
2012-05-29
|
[array(['Mansuripur', 'Masud', ''], dtype=object)
array(['Zakharian', 'Armis R.', ''], dtype=object)
array(['Wright', 'Ewan M.', ''], dtype=object)]
|
4,006 |
0706.0016
|
Maxim Dzero
|
M. Dzero and P. Coleman
|
Superconductivity due to co-operative Kondo effect in Pu 115's
|
2 pages; Proceedings of SCES'07
|
Physica B 403, 955-957 (2008)
|
10.1016/j.physb.2007.10.063
| null |
cond-mat.str-el cond-mat.supr-con
| null |
We outline key elements of a theory that accounts for anomalous properties of
the PuCoGa$_5$ and PuRhGa$_5$ compounds as a consequence of a two-body
interference between two Kondo screening channels. Virtual valence fluctuations
of the magnetic Pu configurations create two conduction channels of different
symmetry. Using the symplectic large-N approach, we are able to demonstrate our
pairing mechanism in an exactly solvable large-N limit. The critical
temperature reaches its maximum when the energy levels of excited valence
configurations are almost degenerate. The symmetry of the order parameter is
determined by the product of the Wannier form factors in the interfering
conduction channels.
|
[{'version': 'v1', 'created': 'Thu, 31 May 2007 20:41:46 GMT'}]
|
2009-11-13
|
[array(['Dzero', 'M.', ''], dtype=object)
array(['Coleman', 'P.', ''], dtype=object)]
|
4,007 |
2102.04358
|
Xin Wang
|
Xin Wang, Shun Zhou
|
Explicit Perturbations to the Stabilizer $\tau = {\rm i}$ of Modular
$A^\prime_5$ Symmetry and Leptonic CP Violation
|
33 pages, 5 figures. More discussions added, to be published in JHEP
|
JHEP 07 (2021) 093
|
10.1007/JHEP07(2021)093
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In a class of neutrino mass models with modular flavor symmetries, it has
been observed that CP symmetry is preserved at the fixed point (or stabilizer)
of the modulus parameter $\tau = {\rm i}$, whereas significant CP violation
emerges within the neighbourhood of this stabilizer. In this paper, we first
construct a viable model with the modular $A^\prime_5$ symmetry, and explore
the phenomenological implications for lepton masses and flavor mixing. Then, we
introduce explicit perturbations to the stabilizer at $\tau = {\rm i}$, and
present both numerical and analytical results to understand why a small
deviation from the stabilizer leads to large CP violation. As low-energy
observables are very sensitive to the perturbations to model parameters, we
further demonstrate that the renormalization-group running effects play an
important role in confronting theoretical predictions at the high-energy scale
with experimental measurements at the low-energy scale.
|
[{'version': 'v1', 'created': 'Mon, 8 Feb 2021 17:03:45 GMT'}
{'version': 'v2', 'created': 'Tue, 13 Jul 2021 01:55:40 GMT'}]
|
2021-07-26
|
[array(['Wang', 'Xin', ''], dtype=object)
array(['Zhou', 'Shun', ''], dtype=object)]
|
4,008 |
1305.7016
|
Biping Gong
|
Bi-Ping Gong and Ya-Ping Li
|
Shell Collision Induced Kilo-Hertz Quasi-Periodic Oscillation in X-Ray
Binaries
|
5pages, 3figures
| null | null | null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Twin kilo-Hertz Quasi-periodic oscillation with ratio 3/2 has been found in
some compact sources, which is believed to be related with their innermost
regions of accretion disks, and hence carrying information of gravity in strong
regime. However, more complicated phenomena have been revealed, e.g., the twin
kilo-Hertz Quasi-periodic oscillation of 4U 1820-20 start increasing at certain
spectral state and then saturate upon reaching certain level. Moreover, such
quasi-periodic oscillation is not uniform and has multiple peaks, which
displays random feature. This letter suggests that these challenges could be
easy to understand if the quasi-periodic oscillation originates in jets of
compact objects. With a seed periodicity originating in either neutron star
spin or accretion, shell collision develops in jet. The corresponding twin
kilo-Hertz quasi-periodic oscillations automatically carry random feature, vary
in frequency; and couple with luminosity, spectral properties, which well
account for the observation of 4U 1820-30. New quasi-periodic oscillation of 4U
1820-30 is predicted, which can test the validity of this model. And the
scenario is applicable to other compact object like AGN.
|
[{'version': 'v1', 'created': 'Thu, 30 May 2013 06:58:11 GMT'}]
|
2013-05-31
|
[array(['Gong', 'Bi-Ping', ''], dtype=object)
array(['Li', 'Ya-Ping', ''], dtype=object)]
|
4,009 |
astro-ph/9901167
| null |
D. Gondek and J.L. Zdunik (N.Copernicus Astronomical Center, Warsaw,
Poland)
|
Avoided crossings in radial pulsations of neutron and strange stars
|
15 pages, 8 figures. Accepted for publication in Astronomy and
Astrophysics
| null | null | null |
astro-ph
| null |
Radial pulsations of neutron stars and strange quark stars with nuclear crust
are studied. The avoided crossing phenomenon occurring for the radial modes is
found and discussed. Neutron star models are constructed using a realistic
equation of state of dense matter and strange star models using a
phenomenological bag model of quark matter. The eigenfrequencies of the three
lowest modes of linear, adiabatic pulsations are calculated, using the
relativistic equations for the radial oscillations.
|
[{'version': 'v1', 'created': 'Wed, 13 Jan 1999 15:20:18 GMT'}]
|
2007-05-23
|
[array(['Gondek', 'D.', '',
'N.Copernicus Astronomical Center, Warsaw,\n Poland'],
dtype=object)
array(['Zdunik', 'J. L.', '',
'N.Copernicus Astronomical Center, Warsaw,\n Poland'],
dtype=object) ]
|
4,010 |
1501.04287
|
Christian Sadel
|
Christian Sadel
|
Anderson transition at 2 dimensional growth rate on antitrees and
spectral theory for operators with one propagating channel
|
38 pages, 1 figure; Introduction reorganized, Corollary 1.3 added and
almost sure essential spectrum now characterized (Proposition 1.4)
| null |
10.1007/s00023-015-0456-3
| null |
math-ph math.FA math.MP math.SP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the Anderson model has a transition from localization to
delocalization at exactly 2 dimensional growth rate on antitrees with
normalized edge weights which are certain discrete graphs. The kinetic part has
a one-dimensional structure allowing a description through transfer matrices
which involve some Schur complement. For such operators we introduce the notion
of having one propagating channel and extend theorems from the theory of
one-dimensional Jacobi operators that relate the behavior of transfer matrices
with the spectrum. These theorems are then applied to the considered model. In
essence, in a certain energy region the kinetic part averages the random
potentials along shells and the transfer matrices behave similar as for a
one-dimensional operator with random potential of decaying variance. At $d$
dimensional growth for $d>2$ this effective decay is strong enough to obtain
absolutely continuous spectrum, whereas for some uniform $d$ dimensional growth
with $d<2$ one has pure point spectrum in this energy region. At exactly
uniform $2$ dimensional growth also some singular continuous spectrum appears,
at least at small disorder. As a corollary we also obtain a change from
singular spectrum ($d\leq 2$) to absolutely continuous spectrum ($d\geq 3)$ for
random operators of the type $\mathcal{P}_r \Delta_d \mathcal{P}_r+\lambda
\mathcal{V}$ on $\mathbb{Z}^d$, where $\mathcal{P}_r$ is an orthogonal radial
projection, $\Delta_d$ the discrete adjacency operator (Laplacian) on
$\mathbb{Z}^d$ and $\lambda \mathcal{V}$ a random potential.
|
[{'version': 'v1', 'created': 'Sun, 18 Jan 2015 12:16:15 GMT'}
{'version': 'v2', 'created': 'Mon, 15 Jun 2015 12:56:12 GMT'}]
|
2016-06-29
|
[array(['Sadel', 'Christian', ''], dtype=object)]
|
4,011 |
1310.5144
|
Beth Biller
|
Beth A. Biller, Ian J.M. Crossfield, Luigi Mancini, Simona Ciceri,
John Southworth, Taisiya G. Kopytova, Micka\"el Bonnefoy, Niall R. Deacon,
Joshua E. Schlieder, Esther Buenzli, Wolfgang Brandner, France Allard, Derek
Homeier, Bernd Freytag, Coryn A.L. Bailer-Jones, Jochen Greiner, Thomas
Henning, Bertrand Goldman
|
Weather on the Nearest Brown Dwarfs: Resolved Simultaneous
Multi-Wavelength Variability Monitoring of WISE J104915.57-531906.1AB
|
14 pages, 5 figures, accepted to ApJ Letters
| null |
10.1088/2041-8205/778/1/L10
| null |
astro-ph.SR astro-ph.EP astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present two epochs of MPG/ESO 2.2m GROND simultaneous 6-band ($r'i'z'JHK$)
photometric monitoring of the closest known L/T transition brown dwarf binary
WISE J104915.57-531906.1AB. We report here the first resolved variability
monitoring of both the T0.5 and L7.5 components. We obtained 4 hours of focused
observations on the night of UT 2013-04-22, as well as 4 hours of defocused
(unresolved) observations on the night of UT 2013-04-16. We note a number of
robust trends in our light curves. The $r'$ and $i'$ light curves appear to be
anticorrelated with $z'$ and $H$ for the T0.5 component and in the unresolved
lightcurve. In the defocused dataset, $J$ appears correlated with $z'$ and $H$
and anticorrelated with $r'$ and $i'$, while in the focused dataset we measure
no variability for $J$ at the level of our photometric precision, likely due to
evolving weather phenomena. In our focused T0.5 component lightcurve, the $K$
band lightcurve displays a significant phase offset relative to both $H$ and
$z'$. We argue that the measured phase offsets are correlated with atmospheric
pressure probed at each band, as estimated from 1D atmospheric models. We also
report low-amplitude variability in $i'$ and $z'$ intrinsic to the L7.5
component.
|
[{'version': 'v1', 'created': 'Fri, 18 Oct 2013 20:00:00 GMT'}]
|
2015-06-17
|
[array(['Biller', 'Beth A.', ''], dtype=object)
array(['Crossfield', 'Ian J. M.', ''], dtype=object)
array(['Mancini', 'Luigi', ''], dtype=object)
array(['Ciceri', 'Simona', ''], dtype=object)
array(['Southworth', 'John', ''], dtype=object)
array(['Kopytova', 'Taisiya G.', ''], dtype=object)
array(['Bonnefoy', 'Mickaël', ''], dtype=object)
array(['Deacon', 'Niall R.', ''], dtype=object)
array(['Schlieder', 'Joshua E.', ''], dtype=object)
array(['Buenzli', 'Esther', ''], dtype=object)
array(['Brandner', 'Wolfgang', ''], dtype=object)
array(['Allard', 'France', ''], dtype=object)
array(['Homeier', 'Derek', ''], dtype=object)
array(['Freytag', 'Bernd', ''], dtype=object)
array(['Bailer-Jones', 'Coryn A. L.', ''], dtype=object)
array(['Greiner', 'Jochen', ''], dtype=object)
array(['Henning', 'Thomas', ''], dtype=object)
array(['Goldman', 'Bertrand', ''], dtype=object)]
|
4,012 |
1310.5257
|
Vytaute Pilipauskaite
|
Vytaute Pilipauskaite, Donatas Surgailis
|
Joint temporal and contemporaneous aggregation of random-coefficient
AR(1) processes
|
This paper has been withdrawn by the author. To appear in Stochastic
Processes and their Applications
| null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss joint temporal and contemporaneous aggregation of $N$ independent
copies of AR(1) process with random-coefficient $a \in [0,1)$ when $N$ and time
scale $n$ increase at different rate. Assuming that $a$ has a density,
regularly varying at $a = 1$ with exponent $-1 < \beta < 1$, different joint
limits of normalized aggregated partial sums are shown to exist when
$N^{1/(1+\beta)}/n$ tends to (i) $\infty$, (ii) 0, (iii) $0 < \mu < \infty$.
The limit process arising under (iii) admits a Poisson integral representation
on $(0,\infty) \times C(\mathbb{R})$ and enjoys "intermediate" properties
between fractional Brownian motion limit in (i) and sub-Gaussian limit in (ii).
|
[{'version': 'v1', 'created': 'Sat, 19 Oct 2013 18:11:50 GMT'}
{'version': 'v2', 'created': 'Tue, 22 Oct 2013 11:01:35 GMT'}]
|
2013-10-23
|
[array(['Pilipauskaite', 'Vytaute', ''], dtype=object)
array(['Surgailis', 'Donatas', ''], dtype=object)]
|
4,013 |
1503.03694
|
Gaku Mitsuka
|
Gaku Mitsuka
|
Forward hadron production in ultraperipheral proton-heavy-ion collisions
at the LHC and RHIC
|
9 pages, 4 figures, 2 table
|
Eur.Phys.J.C75:614,2015
|
10.1140/epjc/s10052-015-3848-0
| null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss hadron production in the forward rapidity region in
ultraperipheral proton-lead collisions at the LHC and proton-gold collisions at
RHIC. Our discussion is based on the Monte Carlo simulations of the
interactions of virtual photons emitted by a fast moving nucleus with a proton
beam. We simulate the virtual photon flux with the STARLIGHT event generator
and then particle production with the SOPHIA, DPMJET, and PYTHIA event
generators. We show the rapidity distributions of charged and neutral
particles, and the momentum distributions of neutral pions and neutrons at
forward rapidities. According to the Monte Carlo simulations, we find large
cross sections of ultraperipheral collisions for particle production especially
in the very forward region, leading to substantial background contributions to
investigations of collective nuclear effects and spin physics. Finally we can
distinguish between proton-nucleus inelastic interactions and ultraperipheral
collisions with additional requirements of either of the charged particles at
midrapidity and a certain level of activities at negative forward rapidity.
|
[{'version': 'v1', 'created': 'Thu, 12 Mar 2015 12:32:02 GMT'}
{'version': 'v2', 'created': 'Wed, 16 Dec 2015 17:26:19 GMT'}]
|
2015-12-29
|
[array(['Mitsuka', 'Gaku', ''], dtype=object)]
|
4,014 |
1909.03425
|
Michele Kotiuga
|
Michele Kotiuga and Karin M. Rabe
|
High-density electron doping of SmNiO$_3$ from first principles
| null |
Phys. Rev. Materials 3, 115002 (2019)
|
10.1103/PhysRevMaterials.3.115002
| null |
cond-mat.mes-hall cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent experimental work has realized a new insulating state of samarium
nickelate (SmNiO$_3$), accessible in a reversible manner via high-density
electron doping. To elucidate this behavior, we use the first-principles
density functional theory (DFT) + U method to study the effect of added
electrons on the crystal and electronic structure of SmNiO$_3$. First, we track
the changes in the crystal and electronic structure with added electrons
compensated by a uniform positive background charge at concentrations of
$\frac{1}{4}$, $\frac{1}{2}$, $\frac{3}{4}$, and 1 electrons per Ni. The change
in electron concentration does not rigidly shift the Fermi energy; rather, the
added electrons localize on NiO$_6$ octahedra causing an on-site Mott
transition and a change in the density of states resulting in a large gap
between the occupied and unoccupied Ni $e_g$ orbitals at full doping. This
evolution of the density of states is essentially unchanged when the added
electrons are introduced by doping with interstitial H or Li ions.
|
[{'version': 'v1', 'created': 'Sun, 8 Sep 2019 10:44:21 GMT'}
{'version': 'v2', 'created': 'Wed, 20 Nov 2019 11:20:47 GMT'}]
|
2019-11-27
|
[array(['Kotiuga', 'Michele', ''], dtype=object)
array(['Rabe', 'Karin M.', ''], dtype=object)]
|
4,015 |
2102.07381
|
Shridhar Velhal
|
Shridhar Velhal, Suresh Sundaram, and Narasimhan Sundararajan
|
A Decentralized Multi-UAV Spatio-Temporal Multi-Task Allocation Approach
for Perimeter Defense
| null | null | null | null |
eess.SY cs.MA cs.RO cs.SY
|
http://creativecommons.org/licenses/by/4.0/
|
This paper provides a new solution approach to a multi-player perimeter
defense game, in which the intruders' team tries to enter the territory, and a
team of defenders protects the territory by capturing intruders on the
perimeter of the territory. The objective of the defenders is to detect and
capture the intruders before the intruders enter the territory. Each defender
independently senses the intruder and computes his trajectory to capture the
assigned intruders in a cooperative fashion. The intruder is estimated to reach
a specific location on the perimeter at a specific time. Each intruder is
viewed as a spatio-temporal task, and the defenders are assigned to execute
these spatio-temporal tasks. At any given time, the perimeter defense problem
is converted into a Decentralized Multi-UAV Spatio-Temporal Multi-Task
Allocation (DMUST-MTA) problem. The cost of executing a task for a trajectory
is defined by a composite cost function of both the spatial and temporal
components. In this paper, a decentralized consensus-based bundle algorithm has
been modified to solve the spatio-temporal multi-task allocation problem, and
the performance evaluation of the proposed approach is carried out based on
Monte-Carlo simulations. The simulation results show the effectiveness of the
proposed approach to solve the perimeter defense game under different
scenarios. Performance comparison with a state-of-the-art centralized approach
with full observability, clearly indicates that DMUST-MTA achieves similar
performance in a decentralized way with partial observability conditions with a
lesser computational time and easy scaling up.
|
[{'version': 'v1', 'created': 'Mon, 15 Feb 2021 07:45:56 GMT'}]
|
2021-02-16
|
[array(['Velhal', 'Shridhar', ''], dtype=object)
array(['Sundaram', 'Suresh', ''], dtype=object)
array(['Sundararajan', 'Narasimhan', ''], dtype=object)]
|
4,016 |
cond-mat/0008468
|
Ilya V. Tokatly
|
I. V. Tokatly and O. Pankratov
|
Many-body diagrammatic expansion in a Kohn-Sham basis: implications for
Time-Dependent Density Functional Theory of excited states
|
4 RevTeX pages including 3 eps figures, submitted to Phys. Rev. Lett;
revised version with new references
|
Phys. Rev. Lett 86, 2078 (2001)
|
10.1103/PhysRevLett.86.2078
| null |
cond-mat
| null |
We formulate diagrammatic rules for many-body perturbation theory which uses
Kohn-Sham (KS) Green's functions as basic propagators. The diagram technique
allows to study the properties of the dynamic nonlocal exchange-correlation
(xc) kernel $f_{xc}$. We show that the spatial non-locality of $f_{xc}$ is
strongly frequency-dependent. In particular, in extended systems the
non-locality range diverges at the excitation energies. This divergency is
related to the discontinuity of the xc potential.
|
[{'version': 'v1', 'created': 'Thu, 31 Aug 2000 14:46:37 GMT'}
{'version': 'v2', 'created': 'Thu, 7 Sep 2000 15:44:54 GMT'}]
|
2009-10-31
|
[array(['Tokatly', 'I. V.', ''], dtype=object)
array(['Pankratov', 'O.', ''], dtype=object)]
|
4,017 |
1403.1482
|
Julia Ehrenm\"uller
|
Dennis Clemens, Julia Ehrenm\"uller, Yury Person, Tuan Tran
|
Keeping Avoider's graph almost acyclic
|
11 pages
|
The Electronic Journal of Combinatorics, 22(1) (2015), P1.60
| null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider biased $(1:b)$ Avoider-Enforcer games in the monotone and strict
versions. In particular, we show that Avoider can keep his graph being a forest
for every but maybe the last round of the game if $b \geq 200 n \ln n$. By this
we obtain essentially optimal upper bounds on the threshold biases for the
non-planarity game, the non-$k$-colorability game, and the $K_t$-minor game
thus addressing a question and improving the results of Hefetz, Krivelevich,
Stojakovi\'c, and Szab\'o. Moreover, we give a slight improvement for the lower
bound in the non-planarity game.
|
[{'version': 'v1', 'created': 'Thu, 6 Mar 2014 16:26:41 GMT'}]
|
2015-03-12
|
[array(['Clemens', 'Dennis', ''], dtype=object)
array(['Ehrenmüller', 'Julia', ''], dtype=object)
array(['Person', 'Yury', ''], dtype=object)
array(['Tran', 'Tuan', ''], dtype=object)]
|
4,018 |
1908.06989
|
Manuel Dahnert
|
Manuel Dahnert, Angela Dai, Leonidas Guibas, Matthias Nie{\ss}ner
|
Joint Embedding of 3D Scan and CAD Objects
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
3D scan geometry and CAD models often contain complementary information
towards understanding environments, which could be leveraged through
establishing a mapping between the two domains. However, this is a challenging
task due to strong, lower-level differences between scan and CAD geometry. We
propose a novel approach to learn a joint embedding space between scan and CAD
geometry, where semantically similar objects from both domains lie close
together. To achieve this, we introduce a new 3D CNN-based approach to learn a
joint embedding space representing object similarities across these domains. To
learn a shared space where scan objects and CAD models can interlace, we
propose a stacked hourglass approach to separate foreground and background from
a scan object, and transform it to a complete, CAD-like representation to
produce a shared embedding space. This embedding space can then be used for CAD
model retrieval; to further enable this task, we introduce a new dataset of
ranked scan-CAD similarity annotations, enabling new, fine-grained evaluation
of CAD model retrieval to cluttered, noisy, partial scans. Our learned joint
embedding outperforms current state of the art for CAD model retrieval by 12%
in instance retrieval accuracy.
|
[{'version': 'v1', 'created': 'Mon, 19 Aug 2019 18:00:03 GMT'}]
|
2019-08-21
|
[array(['Dahnert', 'Manuel', ''], dtype=object)
array(['Dai', 'Angela', ''], dtype=object)
array(['Guibas', 'Leonidas', ''], dtype=object)
array(['Nießner', 'Matthias', ''], dtype=object)]
|
4,019 |
1305.2850
|
Luca Di Luzio
|
Luca Di Luzio and Luminita Mihaila
|
Unification scale vs. electroweak-triplet mass in the SU(5) + 24_F model
at three loops
|
16 pages, 7 figures. One reference added. To appear in Phys. Rev. D
| null |
10.1103/PhysRevD.87.115025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It was shown recently that the original SU(5) theory of Georgi and Glashow,
augmented with an adjoint fermionic multiplet 24_F, can be made compatible both
with neutrino masses and gauge coupling unification. In particular, the model
predicts that either electroweak-triplet states are light, within the reach of
the Large Hadron Collider (LHC), or proton decay will become accessible at the
next generation of megaton-scale facilities. In this paper, we present the
computation of the correlation function between the electroweak-triplet masses
and the unification scale at the next-to-next-to-leading-order (NNLO). Such an
accuracy on the theory side is necessary in order to settle the convergence of
the perturbative expansion and to match the experimental precision on the
determination of the electroweak gauge couplings at the Z-boson mass scale.
|
[{'version': 'v1', 'created': 'Mon, 13 May 2013 17:15:17 GMT'}
{'version': 'v2', 'created': 'Fri, 21 Jun 2013 08:49:06 GMT'}]
|
2013-08-09
|
[array(['Di Luzio', 'Luca', ''], dtype=object)
array(['Mihaila', 'Luminita', ''], dtype=object)]
|
4,020 |
2005.11672
|
Friedrich Herrmann
|
Friedrich Herrmann
|
The local balance laws for energy, momentum and entropy: how they came
into being, and what was their destiny
|
8 pages
|
MNU, Heft 2/2015, (68. Jg.), p. 68
| null | null |
physics.hist-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The historical process of the genesis of the extensive or substance-like
quantities took place in two steps. First, global conservation or
non-conservation was discovered. Only later did it become possible to formulate
the balance locally in the form of a continuity equation. This process can be
clearly seen in energy, momentum, and entropy. After a long and intricate
history, the quantitative description of the local balance has been achieved
for all of the three quantities in a surprisingly short period of time around
the turn of the 19th to the 20th century. The new ideas could have simplified
considerably the teaching of energy, momentum, and entropy. However, in all
three cases, today's language of physics remained essentially the same as it
was at the time when a local balancing was not yet possible.
|
[{'version': 'v1', 'created': 'Sun, 24 May 2020 07:25:42 GMT'}]
|
2020-06-25
|
[array(['Herrmann', 'Friedrich', ''], dtype=object)]
|
4,021 |
1410.5837
|
Chao Gao
|
Chao Gao, Yu Lu, Harrison H. Zhou
|
Rate-optimal graphon estimation
|
Published at http://dx.doi.org/10.1214/15-AOS1354 in the Annals of
Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical
Statistics (http://www.imstat.org)
|
Annals of Statistics 2015, Vol. 43, No. 6, 2624-2652
|
10.1214/15-AOS1354
|
IMS-AOS-AOS1354
|
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Network analysis is becoming one of the most active research areas in
statistics. Significant advances have been made recently on developing
theories, methodologies and algorithms for analyzing networks. However, there
has been little fundamental study on optimal estimation. In this paper, we
establish optimal rate of convergence for graphon estimation. For the
stochastic block model with $k$ clusters, we show that the optimal rate under
the mean squared error is $n^{-1}\log k+k^2/n^2$. The minimax upper bound
improves the existing results in literature through a technique of solving a
quadratic equation. When $k\leq\sqrt{n\log n}$, as the number of the cluster
$k$ grows, the minimax rate grows slowly with only a logarithmic order
$n^{-1}\log k$. A key step to establish the lower bound is to construct a novel
subset of the parameter space and then apply Fano's lemma, from which we see a
clear distinction of the nonparametric graphon estimation problem from
classical nonparametric regression, due to the lack of identifiability of the
order of nodes in exchangeable random graph models. As an immediate
application, we consider nonparametric graphon estimation in a H\"{o}lder class
with smoothness $\alpha$. When the smoothness $\alpha\geq1$, the optimal rate
of convergence is $n^{-1}\log n$, independent of $\alpha$, while for
$\alpha\in(0,1)$, the rate is $n^{-2\alpha/(\alpha+1)}$, which is, to our
surprise, identical to the classical nonparametric rate.
|
[{'version': 'v1', 'created': 'Tue, 21 Oct 2014 20:03:15 GMT'}
{'version': 'v2', 'created': 'Fri, 31 Oct 2014 15:25:30 GMT'}
{'version': 'v3', 'created': 'Tue, 17 Nov 2015 11:40:20 GMT'}]
|
2015-11-18
|
[array(['Gao', 'Chao', ''], dtype=object)
array(['Lu', 'Yu', ''], dtype=object)
array(['Zhou', 'Harrison H.', ''], dtype=object)]
|
4,022 |
0908.4073
|
Jinwoo Shin
|
Kyomin Jung, Devavrat Shah, Jinwoo Shin
|
Distributed Averaging via Lifted Markov Chains
| null | null | null | null |
cs.IT cs.DC math.IT math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by applications of distributed linear estimation, distributed
control and distributed optimization, we consider the question of designing
linear iterative algorithms for computing the average of numbers in a network.
Specifically, our interest is in designing such an algorithm with the fastest
rate of convergence given the topological constraints of the network. As the
main result of this paper, we design an algorithm with the fastest possible
rate of convergence using a non-reversible Markov chain on the given network
graph. We construct such a Markov chain by transforming the standard Markov
chain, which is obtained using the Metropolis-Hastings method. We call this
novel transformation pseudo-lifting. We apply our method to graphs with
geometry, or graphs with doubling dimension. Specifically, the convergence time
of our algorithm (equivalently, the mixing time of our Markov chain) is
proportional to the diameter of the network graph and hence optimal. As a
byproduct, our result provides the fastest mixing Markov chain given the
network topological constraints, and should naturally find their applications
in the context of distributed optimization, estimation and control.
|
[{'version': 'v1', 'created': 'Thu, 27 Aug 2009 19:17:19 GMT'}]
|
2009-08-28
|
[array(['Jung', 'Kyomin', ''], dtype=object)
array(['Shah', 'Devavrat', ''], dtype=object)
array(['Shin', 'Jinwoo', ''], dtype=object)]
|
4,023 |
astro-ph/9910535
|
Valerio Bozza
|
V. Bozza
|
Caustics in special multiple lenses
|
11 pages, 7 figures, submitted to A & A
|
Astron.Astrophys.355:423-432,2000
| null | null |
astro-ph
| null |
Despite its mathematical complexity, the multiple gravitational lens can be
studied in detail in every situation where a perturbative approach is possible.
In this paper, we examine the caustics of a system with a lens very far from
the others with respect to their Einstein radii, and a system where mutual
distances between lenses are small compared to the Einstein radius of the total
mass. Finally we review the case of a planetary system adding some new
information (area of caustics, duality and higher order terms).
|
[{'version': 'v1', 'created': 'Fri, 29 Oct 1999 10:53:31 GMT'}
{'version': 'v2', 'created': 'Thu, 13 Jan 2000 13:53:19 GMT'}]
|
2011-05-23
|
[array(['Bozza', 'V.', ''], dtype=object)]
|
4,024 |
1304.1693
|
Michael Helmers
|
Michael Helmers and Michael Herrmann
|
Interface dynamics in discrete forward-backward diffusion equations
|
34 pages, several figures
|
SIAM Multiscale Model. Simul., vol. 11, no. 4, pp. 1261-1297, 2013
|
10.1137/130915959
| null |
math.AP math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the motion of phase interfaces in a diffusive lattice equation with
bistable nonlinearity and derive a free boundary problem with hysteresis to
describe the macroscopic evolution in the parabolic scaling limit.
The first part of the paper deals with general bistable nonlinearities and is
restricted to numerical experiments and heuristic arguments. We discuss the
formation of macroscopic data and present numerical evidence for pinning,
depinning, and annihilation of interfaces. Afterwards we identify a generalized
Stefan condition along with a hysteretic flow rule that characterize the
dynamics of both standing and moving interfaces.
In the second part, we rigorously justify the limit dynamics for
single-interface data and a special piecewise affine nonlinearity. We prove
persistence of such data, derive upper bounds for the macroscopic interface
speed, and show that the macroscopic limit can indeed be described by the free
boundary problem. The fundamental ingredient to our proofs is a representation
formula that links the solutions of the nonlinear lattice to the discrete heat
kernel and enables us to derive macroscopic compactness results in the space of
continuous functions.
|
[{'version': 'v1', 'created': 'Fri, 5 Apr 2013 12:27:46 GMT'}]
|
2015-03-03
|
[array(['Helmers', 'Michael', ''], dtype=object)
array(['Herrmann', 'Michael', ''], dtype=object)]
|
4,025 |
1609.02954
|
Nhien-An Le-Khac
|
Robert van Voorst, M-Tahar Kechadi, Nhien-An Le-Khac
|
Forensics Acquisition of IMVU: A Case Study
| null | null | null | null |
cs.CR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There are many applications available for personal computers and mobile
devices that facilitate users in meeting potential partners. There is, however,
a risk associated with the level of anonymity on using instant message
applications, because there exists the potential for predators to attract and
lure vulnerable users. Today Instant Messaging within a Virtual Universe (IMVU)
combines custom avatars, chat or instant message (IM), community, content
creation, commerce, and anonymity. IMVU is also being exploited by criminals to
commit a wide variety of offenses. However, there are very few researches on
digital forensic acquisition of IMVU applications. In this paper, we discuss
first of all on challenges of IMVU forensics. We present a forensic acquisition
of an IMVU 3D application as a case study. We also describe and analyse our
experiments with this application.
|
[{'version': 'v1', 'created': 'Fri, 9 Sep 2016 21:59:00 GMT'}]
|
2016-09-13
|
[array(['van Voorst', 'Robert', ''], dtype=object)
array(['Kechadi', 'M-Tahar', ''], dtype=object)
array(['Le-Khac', 'Nhien-An', ''], dtype=object)]
|
4,026 |
2002.05367
|
Edoardo Ballico
|
Edoardo Ballico
|
Linear dependent subsets of Segre varieties
| null | null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the linear algebra of finite subsets $S$ of a Segre variety $X$. In
particular we classify the pairs $(S,X)$ with $S$ linear dependent and
$\#(S)\le 5$. We consider an additional condition for linear dependent sets (no
two of their points are contained in a line of $X$) and get far better lower
bounds for $\#(S)$ in term of the dimension and number of the factors of $X$.
In this discussion and in the classification of the case $\#(S)= 5$, $X\cong
\mathbb {P}^1\times \mathbb {P}^1\times \mathbb {P}^1$ we use the rational
normal curves
|
[{'version': 'v1', 'created': 'Thu, 13 Feb 2020 06:56:28 GMT'}]
|
2020-02-14
|
[array(['Ballico', 'Edoardo', ''], dtype=object)]
|
4,027 |
1604.01369
|
Rajarshi Tiwari
|
Abhinav Saket and Rajarshi Tiwari
|
Orbital Mott transition in two dimensional Pyrochlore lattice
|
7 pages, 4 figures. This is final revised version
|
J. Phys.: Condens. Matter 32 255601 (2020)
|
10.1088/1361-648X/ab7a4b
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study orbital Mott transition in two dimensional pyrochlore lattice, using
a two orbital Hubbard model with only inter-orbital electronic hopping. We use
a real space Monte Carlo based approach to study the model at finite
temperature, and establish temperature-interaction phase diagrams that
highlight the Mott transition, orbital ordering, and spectral trends, and
possible window of pseudo gap. Due to only inter-orbital hopping, the Mott
insulator `generates' ferro exchange resulting in ferro-orbital ordering, with
T$_{corr}/t$ peaked at $\approx$ 0.2 around $U/t \approx 6$. The optical
conductivity shows unusual two peak feature due to two dimensional pyrochlore
lattice.
|
[{'version': 'v1', 'created': 'Tue, 5 Apr 2016 19:01:16 GMT'}
{'version': 'v2', 'created': 'Wed, 29 Mar 2017 08:58:32 GMT'}
{'version': 'v3', 'created': 'Fri, 6 Sep 2019 14:01:12 GMT'}
{'version': 'v4', 'created': 'Thu, 27 Feb 2020 22:22:44 GMT'}]
|
2020-04-14
|
[array(['Saket', 'Abhinav', ''], dtype=object)
array(['Tiwari', 'Rajarshi', ''], dtype=object)]
|
4,028 |
2110.13138
|
Chandan Setty
|
Chandan Setty, Laura Fanfarillo and P. J. Hirschfeld
|
Microscopic mechanism for fluctuating pair density wave
|
13 pages, 6 figures including Supplemental Material
|
Nat Commun 14, 3181 (2023)
|
10.1038/s41467-023-38956-x
| null |
cond-mat.supr-con cond-mat.str-el
|
http://creativecommons.org/licenses/by/4.0/
|
In weakly coupled BCS superconductors, only electrons within a tiny energy
window around the Fermi energy, $E_F$, form Cooper pairs. This may not be the
case in strong coupling superconductors such as cuprates, FeSe, SrTiO$_3$ or
cold atom condensates where the pairing scale, $E_B$, becomes comparable or
even larger than $E_F$. In cuprates, for example, a plausible candidate for the
pseudogap state at low doping is a fluctuating pair density wave, but no
microscopic model has yet been found which supports such a state. In this work,
we write an analytically solvable model to examine pairing phases in the
strongly coupled regime and in the presence of anisotropic interactions.
Already for moderate coupling we find an unusual finite temperature phase,
below an instability temperature $T_i$, where local pair correlations have
non-zero center-of-mass momentum but lack long-range order. At low temperature,
this fluctuating pair density wave can condense either to a uniform $d$-wave
superconductor or the widely postulated pair-density wave phase depending on
the interaction strength. Our minimal model offers a unified microscopic
framework to understand the emergence of both fluctuating and long range pair
density waves in realistic systems.
|
[{'version': 'v1', 'created': 'Mon, 25 Oct 2021 17:59:59 GMT'}]
|
2023-06-05
|
[array(['Setty', 'Chandan', ''], dtype=object)
array(['Fanfarillo', 'Laura', ''], dtype=object)
array(['Hirschfeld', 'P. J.', ''], dtype=object)]
|
4,029 |
1409.3984
|
Gabriel Weymouth
|
G. D. Weymouth and V. Subramaniam and M. S. Triantafyllou
|
Ultra-fast escape maneuver of an octopus-inspired robot
|
Submitted July 10th to Bioinspiration & Biomimetics
| null |
10.1088/1748-3190/10/1/016016
| null |
physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We design and test an octopus-inspired flexible hull robot that demonstrates
outstanding fast-starting performance. The robot is hyper-inflated with water,
and then rapidly deflates to expel the fluid so as to power the escape
maneuver. Using this robot we verify for the first time in laboratory testing
that rapid size-change can substantially reduce separation in bluff bodies
traveling several body lengths, and recover fluid energy which can be employed
to improve the propulsive performance. The robot is found to experience speeds
over ten body lengths per second, exceeding that of a similarly propelled
optimally streamlined rigid rocket. The peak net thrust force on the robot is
more than 2.6 times that on an optimal rigid body performing the same maneuver,
experimentally demonstrating large energy recovery and enabling acceleration
greater than 14 body lengths per second squared. Finally, over 53% of the
available energy is converted into payload kinetic energy, a performance that
exceeds the estimated energy conversion efficiency of fast-starting fish. The
Reynolds number based on final speed and robot length is $Re \approx 700,000$.
We use the experimental data to establish a fundamental deflation scaling
parameter $\sigma^*$ which characterizes the mechanisms of flow control via
shape change. Based on this scaling parameter, we find that the fast-starting
performance improves with increasing size.
|
[{'version': 'v1', 'created': 'Sat, 13 Sep 2014 19:32:15 GMT'}
{'version': 'v2', 'created': 'Fri, 24 Oct 2014 13:59:52 GMT'}]
|
2015-02-04
|
[array(['Weymouth', 'G. D.', ''], dtype=object)
array(['Subramaniam', 'V.', ''], dtype=object)
array(['Triantafyllou', 'M. S.', ''], dtype=object)]
|
4,030 |
0705.1448
|
Tom Mackay
|
Jiajia Cui (University of Edinburgh), Tom G. Mackay (University of
Edinburgh)
|
On convergence of the extended strong-property-fluctuation theory for
bianisotropic homogenized composites
| null |
Electromagnetics 27, 495--506, 2007.
| null | null |
physics.optics
| null |
The strong-property-fluctuation theory (SPFT) provides a sophisticated means
of estimating the effective constitutive parameters of a homogenized composite
material (HCM), which takes account of the statistical distribution of the
component particles. We present an extended version of the third-order SPFT in
which the component particles are represented as depolarization regions of
nonzero volume. Numerical results are provided for a bianisotropic
homogenization scenario wherein the HCM is a Faraday chiral medium. Thereby,
convergence of the extended SPFT at the second-order level of approximation is
demonstrated within the long-wavelength regime.
|
[{'version': 'v1', 'created': 'Thu, 10 May 2007 12:06:52 GMT'}]
|
2008-03-28
|
[array(['Cui', 'Jiajia', '', 'University of Edinburgh'], dtype=object)
array(['Mackay', 'Tom G.', '', 'University of\n Edinburgh'], dtype=object)]
|
4,031 |
1405.5031
|
Christian A. Zaugg
|
Christian A. Zaugg, Alexander Klenner, Mario Mangold, Aline S. Mayer,
Sandro M. Link, Florian Emaury, Matthias Golling, Emilio Gini, Clara J.
Saraceno, Bauke W. Tilma, Ursula Keller
|
Gigahertz Self-referenceable Frequency Comb from a Semiconductor Disk
Laser
| null | null |
10.1364/OE.22.016445
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a 1.75-GHz self-referenceable frequency comb from a vertical
external-cavity surface-emitting laser (VECSEL) passively modelocked with a
semiconductor saturable absorber mirror (SESAM). The VECSEL delivers 231-fs
pulses with an average power of 100 mW and is optimized for stable and reliable
operation. The optical spectrum was centered around 1038 nm and nearly
transform-limited with a full width half maximum (FWHM) bandwidth of 5.5 nm.
The pulses were first amplified to an average power of 5.5 W using a
backward-pumped Yb-doped double-clad large mode area (LMA) fiber and then
compressed to 85 fs with 2.2 W of average power with a passive LMA fiber and
transmission gratings. Subsequently, we launched the pulses into a highly
nonlinear photonic crystal fiber (PCF) and generated a coherent octave-spanning
supercontinuum (SC). We then detected the carrier-envelope offset (CEO)
frequency (fCEO) beat note using a standard f-to-2f-interferometer. The fCEO
exhibits a signal-to-noise ratio of 17 dB in a 100-kHz resolution bandwidth and
a FWHM of 10 MHz. To our knowledge, this is the first report on the detection
of the fCEO from a semiconductor laser, opening the door to fully stabilized
compact frequency combs based on modelocked semiconductor disk lasers.
|
[{'version': 'v1', 'created': 'Tue, 20 May 2014 11:01:22 GMT'}
{'version': 'v2', 'created': 'Wed, 21 May 2014 13:22:26 GMT'}]
|
2015-06-19
|
[array(['Zaugg', 'Christian A.', ''], dtype=object)
array(['Klenner', 'Alexander', ''], dtype=object)
array(['Mangold', 'Mario', ''], dtype=object)
array(['Mayer', 'Aline S.', ''], dtype=object)
array(['Link', 'Sandro M.', ''], dtype=object)
array(['Emaury', 'Florian', ''], dtype=object)
array(['Golling', 'Matthias', ''], dtype=object)
array(['Gini', 'Emilio', ''], dtype=object)
array(['Saraceno', 'Clara J.', ''], dtype=object)
array(['Tilma', 'Bauke W.', ''], dtype=object)
array(['Keller', 'Ursula', ''], dtype=object)]
|
4,032 |
2207.05825
|
Hrvoje Pandzic
|
Domagoj Vlah and Karlo \v{S}epetanc and Hrvoje Pand\v{z}i\'c
|
Solving Bilevel Optimal Bidding Problems Using Deep Convolutional Neural
Networks
| null | null |
10.1109/JSYST.2022.3232942
| null |
eess.SY cs.SY
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Current state-of-the-art solution techniques for solving bilevel optimization
problems either assume strong problem regularity criteria or are
computationally intractable. In this paper we address power system problems of
bilevel structure, commonly arising after the deregulation of the power
industry. Such problems are predominantly solved by converting the lower-level
problem into a set of equivalent constraints using the Karush-Kuhn-Tucker
optimality conditions at an expense of binary variables. Furthermore, in case
the lower-level problem is nonconvex, the strong duality does not hold
rendering the single-level reduction techniques inapplicable. To overcome this,
we propose an effective numerical scheme based on bypassing the lower level
completely using an approximation function that replicates the relevant lower
level effect on the upper level. The approximation function is constructed by
training a deep convolutional neural network. The numerical procedure is run
iteratively to enhance the accuracy. As a case study, the proposed method is
applied to a price-maker energy storage optimal bidding problem that considers
an AC power flow-based market clearing in the lower level. The results indicate
that greater actual profits are achieved as compared to the less accurate DC
market representation.
|
[{'version': 'v1', 'created': 'Tue, 12 Jul 2022 20:36:54 GMT'}
{'version': 'v2', 'created': 'Tue, 9 Aug 2022 16:43:21 GMT'}]
|
2023-06-21
|
[array(['Vlah', 'Domagoj', ''], dtype=object)
array(['Šepetanc', 'Karlo', ''], dtype=object)
array(['Pandžić', 'Hrvoje', ''], dtype=object)]
|
4,033 |
2112.13320
|
Akshay Parekh
|
Akshay Parekh, Ashish Anand, Amit Awekar
|
Budget Sensitive Reannotation of Noisy Relation Classification Data
Using Label Hierarchy
| null | null | null | null |
cs.CL cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Large crowd-sourced datasets are often noisy and relation classification (RC)
datasets are no exception. Reannotating the entire dataset is one probable
solution however it is not always viable due to time and budget constraints.
This paper addresses the problem of efficient reannotation of a large noisy
dataset for the RC. Our goal is to catch more annotation errors in the dataset
while reannotating fewer instances. Existing work on RC dataset reannotation
lacks the flexibility about how much data to reannotate. We introduce the
concept of a reannotation budget to overcome this limitation. The immediate
follow-up problem is: Given a specific reannotation budget, which subset of the
data should we reannotate? To address this problem, we present two strategies
to selectively reannotate RC datasets. Our strategies utilize the taxonomic
hierarchy of relation labels. The intuition of our work is to rely on the graph
distance between actual and predicted relation labels in the label hierarchy
graph. We evaluate our reannotation strategies on the well-known TACRED
dataset. We design our experiments to answer three specific research questions.
First, does our strategy select novel candidates for reannotation? Second, for
a given reannotation budget is our reannotation strategy more efficient at
catching annotation errors? Third, what is the impact of data reannotation on
RC model performance measurement? Experimental results show that our both
reannotation strategies are novel and efficient. Our analysis indicates that
the current reported performance of RC models on noisy TACRED data is inflated.
|
[{'version': 'v1', 'created': 'Sun, 26 Dec 2021 05:50:51 GMT'}]
|
2021-12-28
|
[array(['Parekh', 'Akshay', ''], dtype=object)
array(['Anand', 'Ashish', ''], dtype=object)
array(['Awekar', 'Amit', ''], dtype=object)]
|
4,034 |
0707.1973
|
Jeppe Johansen
|
J. Johansen, S. Stobbe, I.S. Nikolaev, T. Lund-Hansen, P.T.
Kristensen, J.M. Hvam, W.L. Vos, and P. Lodahl
|
Size-Dependence of the Wavefunction of Self-Assembled Quantum Dots
|
5 pages, 3 figures
|
Phys. Rev. B, vol 77, page 073303, 2008
|
10.1103/PhysRevB.77.073303
| null |
cond-mat.other
| null |
The radiative and non-radiative decay rates of InAs quantum dots are measured
by controlling the local density of optical states near an interface. From
time-resolved measurements we extract the oscillator strength and the quantum
efficiency and their dependence on emission energy. From our results and a
theoretical model we determine the striking dependence of the overlap of the
electron and hole wavefunctions on the quantum dot size. We conclude that the
optical quality is best for large quantum dots, which is important in order to
optimally tailor quantum dot emitters for, e.g., quantum electrodynamics
experiments.
|
[{'version': 'v1', 'created': 'Fri, 13 Jul 2007 11:15:05 GMT'}
{'version': 'v2', 'created': 'Tue, 9 Oct 2007 07:01:23 GMT'}
{'version': 'v3', 'created': 'Mon, 10 Dec 2007 13:57:33 GMT'}]
|
2008-02-18
|
[array(['Johansen', 'J.', ''], dtype=object)
array(['Stobbe', 'S.', ''], dtype=object)
array(['Nikolaev', 'I. S.', ''], dtype=object)
array(['Lund-Hansen', 'T.', ''], dtype=object)
array(['Kristensen', 'P. T.', ''], dtype=object)
array(['Hvam', 'J. M.', ''], dtype=object)
array(['Vos', 'W. L.', ''], dtype=object)
array(['Lodahl', 'P.', ''], dtype=object)]
|
4,035 |
1402.5275
|
Abhishek Bhattacharya
|
Tanusree Chatterjee, Abhishek Bhattacharya
|
VHDL Modeling of Intrusion Detection & Prevention System (IDPS) A Neural
Network Approach
| null | null |
10.14445/22312803/IJCTT-V8P110
| null |
cs.CR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The rapid development and expansion of World Wide Web and network systems
have changed the computing world in the last decade and also equipped the
intruders and hackers with new facilities for their destructive purposes. The
cost of temporary or permanent damages caused by unauthorized access of the
intruders to computer systems has urged different organizations to increasingly
implement various systems to monitor data flow in their network. The systems
are generally known as Intrusion Detection System (IDS).Our objective is to
implement an artificial network approach to the design of intrusion detection
and prevention system and finally convert the designed model to a VHDL (Very
High Speed Integrated Circuit Hardware Descriptive Language) code. This feature
enables the system to suggest proper actions against possible attacks. The
promising results of the present study show the potential applicability of ANNs
for developing practical IDSs.
|
[{'version': 'v1', 'created': 'Fri, 21 Feb 2014 12:27:55 GMT'}]
|
2014-02-24
|
[array(['Chatterjee', 'Tanusree', ''], dtype=object)
array(['Bhattacharya', 'Abhishek', ''], dtype=object)]
|
4,036 |
1012.3021
|
Michael Wurm
|
Michael Wurm (1), Barbara Caccianiga (2), Davide D'Angelo (2), Stefano
Davini (3), Franz von Feilitzsch (1), Marianne G\"oger-Neff (1), Tobias
Lachenmaier (4), Timo Lewke (1), Paolo Lombardi (2), Livia Ludhova (2),
Quirin Meindl (1), Emanuela Meroni (2), Lino Miramonti (2), Randolph
M\"ollenberg (1), Lothar Oberauer (1), Walter Potzel (1), Gioacchino Ranucci
(2), Marc Tippmann (1), J\"urgen Winter (1) ((1) TU M\"unchen, Germany, (2)
Universit\`a degli Studi e INFN Milano, Italy, (3) Universit\`a e INFN
Genova, Italy, (4) Universit\"at T\"ubingen, Germany)
|
Search for modulations of the solar Be-7 flux in the next-generation
neutrino observatory LENA
|
15 pages, 9 figures
|
Phys.Rev.D83:032010,2011
|
10.1103/PhysRevD.83.032010
| null |
astro-ph.IM astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A next-generation liquid-scintillator detector will be able to perform
high-statistics measurements of the solar neutrino flux. In LENA, solar Be-7
neutrinos are expected to cause 1.7x10^4 electron recoil events per day in a
fiducial volume of 35 kilotons. Based on this signal, a search for periodic
modulations on sub-percent level can be conducted, surpassing the sensitivity
of current detectors by at least a factor of 20. The range of accessible
periods reaches from several minutes, corresponding to modulations induced by
helioseismic g-modes, to tens of years, allowing to study long-term changes in
solar fusion rates.
|
[{'version': 'v1', 'created': 'Tue, 14 Dec 2010 13:21:43 GMT'}]
|
2011-03-23
|
[array(['Wurm', 'Michael', ''], dtype=object)
array(['Caccianiga', 'Barbara', ''], dtype=object)
array(["D'Angelo", 'Davide', ''], dtype=object)
array(['Davini', 'Stefano', ''], dtype=object)
array(['von Feilitzsch', 'Franz', ''], dtype=object)
array(['Göger-Neff', 'Marianne', ''], dtype=object)
array(['Lachenmaier', 'Tobias', ''], dtype=object)
array(['Lewke', 'Timo', ''], dtype=object)
array(['Lombardi', 'Paolo', ''], dtype=object)
array(['Ludhova', 'Livia', ''], dtype=object)
array(['Meindl', 'Quirin', ''], dtype=object)
array(['Meroni', 'Emanuela', ''], dtype=object)
array(['Miramonti', 'Lino', ''], dtype=object)
array(['Möllenberg', 'Randolph', ''], dtype=object)
array(['Oberauer', 'Lothar', ''], dtype=object)
array(['Potzel', 'Walter', ''], dtype=object)
array(['Ranucci', 'Gioacchino', ''], dtype=object)
array(['Tippmann', 'Marc', ''], dtype=object)
array(['Winter', 'Jürgen', ''], dtype=object)]
|
4,037 |
2303.16508
|
Rob Stevenson
|
Harald Monsuur, Rob Stevenson
|
A pollution-free ultra-weak FOSLS discretization of the Helmholtz
equation
| null | null | null | null |
math.NA cs.NA
|
http://creativecommons.org/licenses/by/4.0/
|
We consider an ultra-weak first order system discretization of the Helmholtz
equation. By employing the optimal test norm, the `ideal' method yields the
best approximation to the pair of the Helmholtz solution and its scaled
gradient w.r.t.~the norm on $L_2(\Omega)\times L_2(\Omega)^d$ from the selected
finite element trial space. On convex polygons, the `practical', implementable
method is shown to be pollution-free when the polynomial degree of the finite
element test space grows proportionally with $\log \kappa$. Numerical results
also on other domains show a much better accuracy than for the Galerkin method.
|
[{'version': 'v1', 'created': 'Wed, 29 Mar 2023 07:34:29 GMT'}]
|
2023-03-30
|
[array(['Monsuur', 'Harald', ''], dtype=object)
array(['Stevenson', 'Rob', ''], dtype=object)]
|
4,038 |
1911.02016
|
Martin Rongen
|
Martin Rongen
|
Calibration of the IceCube Neutrino Observatory
|
PHD thesis
| null |
10.18154/RWTH-2019-09941
| null |
astro-ph.IM physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The IceCube Neutrino Observatory instruments roughly one cubic kilometer of
deep, glacial ice below the geographic South Pole with 5160 optical sensors to
register the Cherenkov light of passing relativistic, charged particles. Since
its construction was completed in 2010, a wide range of analyses has been
performed. Those include, among others, the discovery of a high energetic
astrophysical neutrino flux, competitive measurements of neutrino oscillation
parameters and world-leading limits on dark matter detection. With
ever-increasing statistics the influence of insufficiently known aspects of the
detector performance start to limit the potential gain of future analyses. This
thesis presents calibration studies on both the hardware characteristics as
well as the optical properties of the instrumented ice. Improving the knowledge
of the detector systematics and the methods to study them does not only aid
IceCube but also inform the design of potential future IceCube extensions.
|
[{'version': 'v1', 'created': 'Tue, 5 Nov 2019 17:43:59 GMT'}]
|
2019-11-26
|
[array(['Rongen', 'Martin', ''], dtype=object)]
|
4,039 |
1104.4697
|
Hui Xing
|
Hui Xing, Gen Long, Hanjie Guo, Youming Zou, Chunmu Feng, Guanghan
Cao, Hao Zeng, Zhu-An Xu
|
Anisotropic paramagnetism of monoclinic Nd2Ti2O7 single crystals
|
15 pages, 4 figures, 1 table. To appear in J. Phys.: Condens. Matter
|
J. Phys.: Condens. Matter 23, 216005 (2011)
|
10.1088/0953-8984/23/21/216005
| null |
cond-mat.mtrl-sci cond-mat.other
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The anisotropic paramagnetism and specific heat in Nd2Ti2O7 single crystals
are investigated. Angular dependence of the magnetization and Weiss
temperatures show the dominant role of the crystal field effect in the
magnetization. By incorporating the results from the diluted samples,
contributions to Weiss temperature from exchange interactions and crystal field
interactions are isolated. The exchange interactions are found to be
ferromagnetic, while the crystal field contributes a large negative part to the
Weiss temperature, along all three crystallographic directions. The specific
heat under magnetic field reveals a two-level Schottky ground state scheme, due
to the Zeeman splitting of the ground state doublet, and the g-factors are thus
determined. These observations provide solid foundations for further
investigations of Nd2Ti2O7.
|
[{'version': 'v1', 'created': 'Mon, 25 Apr 2011 08:39:20 GMT'}]
|
2015-05-28
|
[array(['Xing', 'Hui', ''], dtype=object)
array(['Long', 'Gen', ''], dtype=object)
array(['Guo', 'Hanjie', ''], dtype=object)
array(['Zou', 'Youming', ''], dtype=object)
array(['Feng', 'Chunmu', ''], dtype=object)
array(['Cao', 'Guanghan', ''], dtype=object)
array(['Zeng', 'Hao', ''], dtype=object)
array(['Xu', 'Zhu-An', ''], dtype=object)]
|
4,040 |
1501.06651
|
Shilpam Sharma
|
K. Vinod, C.S. Deepak, Shilpam Sharma, D. Sornadurai, C. S.Sundar and
A. Bharathi
|
Magnetic behavior of the metal organic framework solid:
[(CH3)2NH2][Co(HCOO)3]
|
5 pages, 7 figures
| null | null | null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study we examine the phase transitions in single crystals of
[(CH3)2NH2]Co(HCOO)3], using magnetization and specific heat measurements as a
function of temperature and magnetic field. Magnetisation measurements indicate
a transition at 15 K that is associated with an antiferromagnetic transition.
The results of the isothermal magnetization versus magnetic field curves
demonstrate the presence of a single-ion magnet phase, coexisting with
antiferromagnetism. A peak in specific heat is seen at 15 K, corresponding to
the magnetic transition. The enthalpy of the transition evaluated from the area
under the specific heat peak decreases with the application of magnetic field
of upto8 T. This is suggestive of long range antiferromagnetic magnetic order,
giving way to single-ion magnetic behavior under external field. In experiments
at high temperatures, corresponding to the well-known structural transition in
this system, the specific heat measurements, shows a peak at ~155K, that is
insensitive to applied magnetic field. The magnetisation in this temperature
range, while it exhibits a paramagnetic behavior, shows a distinct jump that
has been attributed to a spin-state transition of Co2+ associated with the
structural transition.
|
[{'version': 'v1', 'created': 'Tue, 27 Jan 2015 04:38:36 GMT'}]
|
2015-01-28
|
[array(['Vinod', 'K.', ''], dtype=object)
array(['Deepak', 'C. S.', ''], dtype=object)
array(['Sharma', 'Shilpam', ''], dtype=object)
array(['Sornadurai', 'D.', ''], dtype=object)
array(['Sundar', 'C. S.', ''], dtype=object)
array(['Bharathi', 'A.', ''], dtype=object)]
|
4,041 |
nlin/0311019
|
Diego Maza
|
Hector Mancini and Diego Maza
|
Pattern formation without heating in an evaporative convection
experiment
|
Submitted to Europhysics Letters
| null |
10.1209/epl/i2003-10266-0
| null |
nlin.PS
| null |
We present an evaporation experiment in a single fluid layer. When latent
heat associated to the evaporation is large enough, the heat flow through the
free surface of the layer generates temperature gradients that can destabilize
the conductive motionless state giving rise to convective cellular structures
without any external heating. The sequence of convective patterns obtained here
without heating, is similar to that obtained in B\'enard-Marangoni convection.
This work present the sequence of spatial bifurcations as a function of the
layer depth. The transition between square to hexagonal pattern, known from
non-evaporative experiments, is obtained here with a similar change in
wavelength.
|
[{'version': 'v1', 'created': 'Tue, 11 Nov 2003 19:34:41 GMT'}]
|
2016-09-08
|
[array(['Mancini', 'Hector', ''], dtype=object)
array(['Maza', 'Diego', ''], dtype=object)]
|
4,042 |
1810.11673
|
M. H. van Emden
|
M.H. van Emden
|
Beyond Structured Programming
|
15 pages, 4 figures
| null | null |
DCS-359-IR
|
cs.PL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The correctness of a structured program is, at best, plausible. Though this
is a step forward compared to what came before, it falls short of verified
correctness. To verify a structured program according to Hoare's method one is
faced with the problem of finding assertions to fit existing code. In 1971 this
mode of verification was declared by Dijkstra as too hard to be of practical
use---he advised that proof and code were to grow together. A method for doing
this was independently published by Reynolds in 1978 and by van Emden in 1979.
The latter was further developed to attain the form of matrix code. This form
of code not only obviates the need of fitting assertions to existing code, but
helps in discovering an algorithm that reaches a given postcondition from a
fixed precondition. In this paper a keyboard-editable version of matrix code is
presented that uses E.W. Dijkstra's guarded commands as starting point. The
result is reached by using Floyd's method rather than Hoare's as starting
point.
|
[{'version': 'v1', 'created': 'Sat, 27 Oct 2018 16:42:41 GMT'}]
|
2018-10-30
|
[array(['van Emden', 'M. H.', ''], dtype=object)]
|
4,043 |
math/0607158
|
Kirill Vankov
|
Alexei Panchishkin, Kirill Vankov
|
Explicit Shimura's conjecture for Sp3 on a computer
| null | null | null | null |
math.NT
| null |
We compute by a different method the generating series in Shimura's
conjecture for Sp3, proved by Andrianov in 1967. We develop formulas for the
Satake spherical maps for Sp_n and Gl_n.
|
[{'version': 'v1', 'created': 'Thu, 6 Jul 2006 12:35:58 GMT'}
{'version': 'v2', 'created': 'Mon, 20 Nov 2006 14:17:08 GMT'}
{'version': 'v3', 'created': 'Thu, 30 Nov 2006 07:58:18 GMT'}]
|
2007-05-23
|
[array(['Panchishkin', 'Alexei', ''], dtype=object)
array(['Vankov', 'Kirill', ''], dtype=object)]
|
4,044 |
1908.09051
|
Etsuo Segawa
|
Sennosuke Watanabe, Akiko Fukuda, Etsuo Segawa, Iwao Sato
|
A walk on max-plus algebra
|
17 pages, 1 figures
| null | null | null |
math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Max-plus algebra is a kind of idempotent semiring over
$\mathbb{R}_{\max}:=\mathbb{R}\cup\{-\infty\}$ with two operations $\oplus :=
\max$ and $\otimes := +$.In this paper, we introduce a new model of a walk on
one dimensional lattice on $\mathbb{Z}$, as an analogue of the quantum walk,
over the max-plus algebra and we call it max-plus walk. In the conventional
quantum walk, the summation of the $\ell^2$-norm of the states over all the
positions is a conserved quantity. In contrast, the summation of eigenvalues of
state decision matrices is a conserved quantity in the max-plus walk.Moreover,
spectral analysis on the total time evolution operator is also given.
|
[{'version': 'v1', 'created': 'Fri, 23 Aug 2019 23:57:30 GMT'}
{'version': 'v2', 'created': 'Thu, 29 Aug 2019 21:20:33 GMT'}]
|
2019-09-02
|
[array(['Watanabe', 'Sennosuke', ''], dtype=object)
array(['Fukuda', 'Akiko', ''], dtype=object)
array(['Segawa', 'Etsuo', ''], dtype=object)
array(['Sato', 'Iwao', ''], dtype=object)]
|
4,045 |
1907.02739
|
Marco Morandotti
|
Marco Morandotti, Francesco Solombrino
|
Mean-field analysis of multi-population dynamics with label switching
|
26 pages
| null | null |
CVGMT 4362
|
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The mean-field analysis of a multi-population agent-based model is performed.
The model couples a particle dynamics driven by a nonlocal velocity with a
Markow-type jump process on the probability that each agent has of belonging to
a given population. A general functional analytic framework for the
well-posedness of the problem is established, and some concrete applications
are presented, both in the case of discrete and continuous set of labels. In
the particular case of a leader-follower dynamics, the existence and
approximation results recently obtained in [2] are recovered and generalized as
a byproduct of the abstract approach proposed.
|
[{'version': 'v1', 'created': 'Fri, 5 Jul 2019 09:31:38 GMT'}
{'version': 'v2', 'created': 'Mon, 8 Jul 2019 12:53:19 GMT'}
{'version': 'v3', 'created': 'Thu, 11 Jul 2019 08:49:27 GMT'}]
|
2019-07-12
|
[array(['Morandotti', 'Marco', ''], dtype=object)
array(['Solombrino', 'Francesco', ''], dtype=object)]
|
4,046 |
1210.0786
|
Michele Gallinaro
|
Michele Gallinaro
|
Top quark physics: From a few to a few millions
|
8 pages, presented at the "24th Rencontres de Blois", May 27-June 1,
2012
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As the heaviest known fundamental particle, the top quark has taken a central
role in the study of fundamental interactions. The top quark mass is a
fundamental parameter of the standard model which places constraints on the
Higgs boson mass and electroweak symmetry breaking. Observations of the
relative rates and kinematics of top quark final states may provide constraints
for new physics processes. Past and current experimental measurements are
presented with a critical view, and a look at the future prospects.
|
[{'version': 'v1', 'created': 'Tue, 2 Oct 2012 14:41:13 GMT'}]
|
2012-10-03
|
[array(['Gallinaro', 'Michele', ''], dtype=object)]
|
4,047 |
1009.3244
|
Bj\"orn Schenke
|
Bjoern Schenke, Sangyong Jeon and Charles Gale
|
Elliptic and triangular flow in event-by-event (3+1)D viscous
hydrodynamics
|
4 pages, 5 figures, version 2 includes resonance decays in the
results, references added, minor typos corrected
|
Phys.Rev.Lett.106:042301,2011
|
10.1103/PhysRevLett.106.042301
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results for the elliptic and triangular flow coefficients in Au+Au
collisions at root-s=200 AGeV using event-by-event (3+1)D viscous hydrodynamic
simulations. We study the effect of initial state fluctuations and finite
viscosities on the flow coefficients v_2 and v_3 as functions of transverse
momentum and pseudo-rapidity. Fluctuations are essential to reproduce the
measured centrality dependence of elliptic flow. We argue that simultaneous
measurements of v_2 and v_3 can determine eta/s more precisely.
|
[{'version': 'v1', 'created': 'Thu, 16 Sep 2010 18:58:22 GMT'}
{'version': 'v2', 'created': 'Fri, 1 Oct 2010 19:04:52 GMT'}]
|
2011-02-02
|
[array(['Schenke', 'Bjoern', ''], dtype=object)
array(['Jeon', 'Sangyong', ''], dtype=object)
array(['Gale', 'Charles', ''], dtype=object)]
|
4,048 |
1304.6573
|
Eric Josef Ribeiro Parteli
|
Eric J. R. Parteli, Orencio Dur\'an, Mary C. Bourke, Haim Tsoar,
Thorsten Poeschel and Hans J. Herrmann
|
Origins of barchan dune asymmetry: insights from numerical simulations
|
17 pages, 12 figures
| null | null | null |
cond-mat.soft physics.geo-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Barchan dunes --- crescent-shaped dunes that form in areas of unidirectional
winds and low sand availability --- commonly display an asymmetric shape, with
one limb extended downwind. Several factors have been identified as potential
causes for barchan dune asymmetry on Earth and Mars: asymmetric bimodal wind
regime, topography, influx asymmetry and dune collision. However, the dynamics
and potential range of barchan morphologies emerging under each specific
scenario that leads to dune asymmetry are far from being understood. In the
present work, we use dune modeling in order to investigate the formation and
evolution of asymmetric barchans. We find that a bimodal wind regime causes
limb extension when the divergence angle between primary and secondary winds is
larger than $90^{\circ}$, whereas the extended limb evolves into a seif dune if
the ratio between secondary and primary transport rates is larger than 25%.
Calculations of dune formation on an inclined surface under constant wind
direction also lead to barchan asymmetry, however no seif dune is obtained from
surface tilting alone. Asymmetric barchans migrating along a tilted surface
move laterally, with transverse migration velocity proportional to the slope of
the terrain. Limb elongation induced by topography can occur when a barchan
crosses a topographic rise. Furthermore, transient asymmetric barchan shapes
with extended limb also emerge during collisions between dunes or due to an
asymmetric influx. Our findings can be useful for making quantitative inference
on local wind regimes or spatial heterogeneities in transport conditions of
planetary dune fields hosting asymmetric barchans.
|
[{'version': 'v1', 'created': 'Wed, 24 Apr 2013 13:20:14 GMT'}
{'version': 'v2', 'created': 'Mon, 2 Dec 2013 11:03:58 GMT'}]
|
2013-12-03
|
[array(['Parteli', 'Eric J. R.', ''], dtype=object)
array(['Durán', 'Orencio', ''], dtype=object)
array(['Bourke', 'Mary C.', ''], dtype=object)
array(['Tsoar', 'Haim', ''], dtype=object)
array(['Poeschel', 'Thorsten', ''], dtype=object)
array(['Herrmann', 'Hans J.', ''], dtype=object)]
|
4,049 |
0805.2161
|
Eduardo Castro
|
Eduardo V. Castro, N. M. R. Peres, J. M. B. Lopes dos Santos
|
Localized States at Zigzag Edges of Multilayer Graphene and Graphite
Steps
|
6 pages, 4 figures
|
Europhys. Lett. 84, 17001 (2008)
|
10.1209/0295-5075/84/17001
| null |
cond-mat.mes-hall cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report the existence of zero energy surface states localized at zigzag
edges of $N$-layer graphene. Working within the tight-binding approximation,
and using the simplest nearest-neighbor model, we derive the analytic solution
for the wavefunctions of these peculiar surface states. It is shown that zero
energy edge states in multilayer graphene can be divided into three families:
(i) states living only on a single plane, equivalent to surface states in
monolayer graphene; (ii) states with finite amplitude over the two last, or the
two first layers of the stack, equivalent to surface states in bilayer
graphene; (iii) states with finite amplitude over three consecutive layers.
Multilayer graphene edge states are shown to be robust to the inclusion of the
next nearest-neighbor interlayer hopping. We generalize the edge state solution
to the case of graphite steps with zigzag edges, and show that edge states
measured through scanning tunneling microscopy and spectroscopy of graphite
steps belong to family (i) or (ii) mentioned above, depending on the way the
top layer is cut.
|
[{'version': 'v1', 'created': 'Wed, 14 May 2008 20:34:14 GMT'}
{'version': 'v2', 'created': 'Wed, 10 Sep 2008 17:59:36 GMT'}]
|
2009-11-13
|
[array(['Castro', 'Eduardo V.', ''], dtype=object)
array(['Peres', 'N. M. R.', ''], dtype=object)
array(['Santos', 'J. M. B. Lopes dos', ''], dtype=object)]
|
4,050 |
astro-ph/0611348
|
Mario Gliozzi
|
M. Gliozzi (1), I.E. Papadakis (2), W. Brinkmann (3) ((1) GMU, (2)
University of Crete, (3) MPE)
|
Long-Term X-Ray spectral variability of the radio-loud NLS1 galaxy PKS
0558-504
|
12 pages, 7 figures, accepted for publication in ApJ
|
Astrophys.J.656:691-698,2007
|
10.1086/510798
| null |
astro-ph
| null |
We present X-ray observations of the Narrow-Line Seyfert 1 galaxy PKS
0558-504 obtained with RXTE during a 1-year monitoring campaign. This source,
which is one of the very few radio-loud NLS1 galaxies, shows strong X-ray flux
variability on time scales of weeks-months accompanied by spectral variability.
The main goal of this study is to investigate the spectral variability with
model-independent methods and time-resolved spectroscopy in order to shed light
on the origin of the X-rays. The main results can be summarized as follows: 1)
The flux typically changes by a factor of 1.5-2 on time scales of 10-30 days,
with few extreme events where the flux increases by a factor of ~4 in 3 days.
2) We do not observe any large amplitude, flux related spectral variations.
During the flux variations, the spectrum varies mainly in normalization and not
in shape. We do observe some small amplitude spectral variations, which do not
correlate with flux, although there is a hint of spectral hardening as the
source brightens. 3) There is no evidence for reprocessing features such as the
Fe Kalpha line or a Compton hump. We argue that PKS 0558-504 is a peculiar
object that appears to be different from most of the radio-quiet and radio-loud
AGN. If a jet is responsible for the bulk of the X-rays, it must operate in an
unusual way. If instead a corona is responsible for the X-rays, the system
might be a large-scale analog of the Galactic black holes in the transient
intermediate state.
|
[{'version': 'v1', 'created': 'Fri, 10 Nov 2006 18:48:00 GMT'}]
|
2008-11-26
|
[array(['Gliozzi', 'M.', ''], dtype=object)
array(['Papadakis', 'I. E.', ''], dtype=object)
array(['Brinkmann', 'W.', ''], dtype=object)]
|
4,051 |
1304.1061
|
Renato Moreira Angelo
|
A. L. O. Bilobran and R. M. Angelo
|
Model for the resistance force acting on circular bodies in the
imminence of rolling
|
6 pages, 3 figures (published version)
|
EPL 103 (2013) 56001
|
10.1209/0295-5075/103/56001
| null |
cond-mat.soft cond-mat.other
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The laws of friction are reasonably well understood for the case of blocks in
contact with rough plane surfaces. However, as far as bodies with circular
sections are concerned, the physics of friction becomes more involving and it
is not possible to adopt a simple conceptual framework to explain all
phenomena. In particular, there is no approach so far to the problem of the
resistance force that opposes to circular bodies that remain at rest while
acted upon by small forces. Here we fill this gap by introducing a mechanical
model based on both the elasticity theory and Hertz contact mechanics. Our
approach furnishes a quantitative expression for the critical force beyond
which rest can no longer be maintained. Besides confirming the expected
proportionality of the resistance force with the load, our result contains no
free parameters and is expressed solely in terms of physical properties of the
problem, such as the pressure of the body per unit of superficial area, a
relation between the Young modulus of the surface and its Poisson ratio, and
the symmetry of the contact.
|
[{'version': 'v1', 'created': 'Wed, 3 Apr 2013 19:13:30 GMT'}
{'version': 'v2', 'created': 'Mon, 30 Sep 2013 12:03:33 GMT'}]
|
2013-10-01
|
[array(['Bilobran', 'A. L. O.', ''], dtype=object)
array(['Angelo', 'R. M.', ''], dtype=object)]
|
4,052 |
1602.05114
|
Kristopher Klein
|
Kristopher G. Klein, Benjamin D.G. Chandran
|
Evolution of The Proton Velocity Distribution due to Stochastic Heating
in the Near-Sun Solar Wind
|
6 pages, 6 figures, accepted for publication in The Astrophysical
Journal
| null |
10.3847/0004-637X/820/1/47
| null |
astro-ph.SR physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate how the proton distribution function evolves when the protons
undergo stochastic heating by strong, low-frequency, Alfv\'en-wave turbulence
under the assumption that $\beta$ is small. We apply our analysis to protons
undergoing stochastic heating in the supersonic fast solar wind and obtain
proton distributions at heliocentric distances ranging from 4 to 30 solar
radii. We find that the proton distribution develops non-Gaussian structure
with a flat core and steep tail. For $r >5 \ R_{\rm S}$, the proton
distribution is well approximated by a modified Moyal distribution. Comparisons
with future measurements from \emph{Solar Probe Plus} could be used to test
whether stochastic heating is occurring in the solar-wind acceleration region.
|
[{'version': 'v1', 'created': 'Tue, 16 Feb 2016 18:00:34 GMT'}]
|
2016-03-23
|
[array(['Klein', 'Kristopher G.', ''], dtype=object)
array(['Chandran', 'Benjamin D. G.', ''], dtype=object)]
|
4,053 |
astro-ph/9805049
|
Pierre North
|
Stephen A. Drake
|
High-Energy Phenomena in Magnetic CP Stars as Revealed by their X-Ray
and Radio Emission
|
8 pages, no figure, to appear in: Proc. of the 26th workshop of the
European Working Group on CP stars, eds. P. North, A. Schnell and J.
Ziznovsky, Contrib. Astr. Obs. Skalnate Pleso Vol. 27, No 3
| null | null | null |
astro-ph
| null |
Before 1985, attempts to detect radio or X-ray emission from Magnetic CP
(MCP) stars were either fruitless or ambiguous. However, more successful
results have been obtained in the last dozen years: (i) Radio emission has now
been detected from ~35 MCP stars of the Helium-peculiar and Silicon-strong
subclasses, with a functional dependence of radio luminosity L_{R} \propto
T_eff^7 H_s^{1.2} P_rot^{-0.6}, where T_eff is the effective temperature, H_s
is the surface magnetic field strength, and P_rot is the rotational period;
rotational modulation of the radio emission has also been observed for several
MCP stars. All of this evidence suggests that it is the MCP stars themselves,
not close companions, that are responsible for the radio emission; (ii) The
X-ray emission properties of MCP stars are however still poorly characterized:
although a moderate number (~18) have by now been associated with X-ray
sources, the lack of a clear correlation of this X-ray emission with other
stellar parameters has made it difficult to rule out the close companion
hypothesis.
|
[{'version': 'v1', 'created': 'Wed, 6 May 1998 07:12:58 GMT'}]
|
2007-05-23
|
[array(['Drake', 'Stephen A.', ''], dtype=object)]
|
4,054 |
1811.06829
|
Matteo Bonini
|
Daniele Bartoli, Matteo Bonini
|
Minimal linear codes in odd characteristic
| null | null | null | null |
math.CO cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we generalize constructions in two recent works of Ding, Heng,
Zhou to any field $\mathbb{F}_q$, $q$ odd, providing infinite families of
minimal codes for which the Ashikhmin-Barg bound does not hold.
|
[{'version': 'v1', 'created': 'Fri, 16 Nov 2018 14:58:22 GMT'}]
|
2018-11-21
|
[array(['Bartoli', 'Daniele', ''], dtype=object)
array(['Bonini', 'Matteo', ''], dtype=object)]
|
4,055 |
1810.00711
|
Alexandre Girouard
|
Bruno Colbois, Alexandre Girouard, Asma Hassannezhad
|
The Steklov and Laplacian spectra of Riemannian manifolds with boundary
|
31 pages, 1 figure
| null | null | null |
math.SP math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given two compact Riemannian manifolds with boundary $M_1$ and $M_2$ such
that their respective boundaries $\Sigma_1$ and $\Sigma_2$ admit neighborhoods
$\Omega_1$ and $\Omega_2$ which are isometric, we prove the existence of a
constant $C$, which depends only on the geometry of $\Omega_1\cong\Omega_2$,
such that $|\sigma_k(M_1)-\sigma_k(M_2)|\leq C$ for each $k\in\mathbb{N}$. This
follows from a quantitative relationship between the Steklov eigenvalues
$\sigma_k$ of a compact Riemannian manifold $M$ and the eigenvalues $\lambda_k$
of the Laplacian on its boundary. Our main result states that the difference
$|\sigma_k-\sqrt{\lambda_k}|$ is bounded above by a constant which depends on
the geometry of $M$ only in a neighborhood of its boundary. The proofs are
based on a Pohozaev identity and on comparison geometry for principal
curvatures of parallel hypersurfaces. In several situations, the constant $C$
is given explicitly in terms of bounds on the geometry of
$\Omega_1\cong\Omega_2$.
|
[{'version': 'v1', 'created': 'Mon, 1 Oct 2018 14:08:44 GMT'}
{'version': 'v2', 'created': 'Thu, 17 Jan 2019 19:26:21 GMT'}]
|
2019-01-21
|
[array(['Colbois', 'Bruno', ''], dtype=object)
array(['Girouard', 'Alexandre', ''], dtype=object)
array(['Hassannezhad', 'Asma', ''], dtype=object)]
|
4,056 |
1408.6827
|
Robert Kaindl A.
|
He Wang, Yiming Xu, Stefan Ulonska, Joseph S. Robinson, Predrag
Ranitovic, Robert A. Kaindl
|
Bright high-repetition-rate source of narrowband extreme-ultraviolet
harmonics beyond 22 eV
|
19 pages, 3 figures, 1 table; updated version with journal ref
|
Nature Commun. 6, 7459 (2015)
|
10.1038/ncomms8459
| null |
physics.optics cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Novel table-top sources of extreme-ultraviolet light based on high-harmonic
generation yield unique insight into the fundamental properties of molecules,
nanomaterials, or correlated solids, and enable advanced applications in
imaging or metrology. Extending high-harmonic generation to high repetition
rates portends great experimental benefits, yet efficient extreme-ultraviolet
conversion of correspondingly weak driving pulses is challenging. Here, we
demonstrate a highly efficient source of femtosecond extreme-ultraviolet pulses
at 50-kHz repetition rate, utilizing the ultraviolet second-harmonic focused
tightly into Kr gas. In this cascaded scheme, a photon flux beyond ~3e13 per
second is generated at 22.3 eV, with 5e-5 conversion efficiency that surpasses
similar harmonics directly driven by the fundamental by two orders of
magnitude. The enhancement arises from both wavelength scaling of the atomic
dipole and improved spatio-temporal phase-matching, confirmed by simulations.
Spectral isolation of a single 72-meV wide harmonic renders this bright, 50-kHz
extreme-ultraviolet source a powerful tool for ultrafast photoemission,
nanoscale imaging and other applications.
|
[{'version': 'v1', 'created': 'Thu, 28 Aug 2014 19:50:22 GMT'}
{'version': 'v2', 'created': 'Thu, 28 Dec 2017 17:47:56 GMT'}]
|
2017-12-29
|
[array(['Wang', 'He', ''], dtype=object)
array(['Xu', 'Yiming', ''], dtype=object)
array(['Ulonska', 'Stefan', ''], dtype=object)
array(['Robinson', 'Joseph S.', ''], dtype=object)
array(['Ranitovic', 'Predrag', ''], dtype=object)
array(['Kaindl', 'Robert A.', ''], dtype=object)]
|
4,057 |
2012.04839
|
Chenyang Zhao
|
Chenyang Zhao, Timothy Hospedales
|
Robust Domain Randomised Reinforcement Learning through Peer-to-Peer
Distillation
| null | null | null | null |
cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
In reinforcement learning, domain randomisation is an increasingly popular
technique for learning more general policies that are robust to domain-shifts
at deployment. However, naively aggregating information from randomised domains
may lead to high variance in gradient estimation and unstable learning process.
To address this issue, we present a peer-to-peer online distillation strategy
for RL termed P2PDRL, where multiple workers are each assigned to a different
environment, and exchange knowledge through mutual regularisation based on
Kullback-Leibler divergence. Our experiments on continuous control tasks show
that P2PDRL enables robust learning across a wider randomisation distribution
than baselines, and more robust generalisation to new environments at testing.
|
[{'version': 'v1', 'created': 'Wed, 9 Dec 2020 03:16:04 GMT'}]
|
2020-12-10
|
[array(['Zhao', 'Chenyang', ''], dtype=object)
array(['Hospedales', 'Timothy', ''], dtype=object)]
|
4,058 |
2108.06080
|
Bo Liu
|
Daoming Lyu, Fangkai Yang, Hugh Kwon, Wen Dong, Levent Yilmaz, Bo Liu
|
TDM: Trustworthy Decision-Making via Interpretability Enhancement
| null |
IEEE Transactions on Emerging Topics in Computational Intelligence
0 (2021) 1-12
|
10.1109/TETCI.2021.3084290
| null |
cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Human-robot interactive decision-making is increasingly becoming ubiquitous,
and trust is an influential factor in determining the reliance on autonomy.
However, it is not reasonable to trust systems that are beyond our
comprehension, and typical machine learning and data-driven decision-making are
black-box paradigms that impede interpretability. Therefore, it is critical to
establish computational trustworthy decision-making mechanisms enhanced by
interpretability-aware strategies. To this end, we propose a Trustworthy
Decision-Making (TDM) framework, which integrates symbolic planning into
sequential decision-making. The framework learns interpretable subtasks that
result in a complex, higher-level composite task that can be formally evaluated
using the proposed trust metric. TDM enables the subtask-level interpretability
by design and converges to an optimal symbolic plan from the learned subtasks.
Moreover, a TDM-based algorithm is introduced to demonstrate the unification of
symbolic planning with other sequential-decision making algorithms, reaping the
benefits of both. Experimental results validate the effectiveness of
trust-score-based planning while improving the interpretability of subtasks.
|
[{'version': 'v1', 'created': 'Fri, 13 Aug 2021 06:22:16 GMT'}]
|
2021-08-16
|
[array(['Lyu', 'Daoming', ''], dtype=object)
array(['Yang', 'Fangkai', ''], dtype=object)
array(['Kwon', 'Hugh', ''], dtype=object)
array(['Dong', 'Wen', ''], dtype=object)
array(['Yilmaz', 'Levent', ''], dtype=object)
array(['Liu', 'Bo', ''], dtype=object)]
|
4,059 |
alg-geom/9710026
|
Dmitry Kaledin
|
D. Kaledin
|
Hyperkaehler structures on total spaces of holomorphic cotangent bundles
|
100 pages, LaTeX2e
| null | null | null |
alg-geom math.AG
| null |
Let $M$ be a Kaehler manifold, and consider the total space $T^*M$ of the
cotangent bundle to $M$. We show that in the formal neighborhood of the zero
section $M \subset T^*M$ the space $T^*M$ admits a canonical hyperkaehler
structure, compatible with the complex and holomorphic symplectic structures on
$T^*M$. The associated hyperkaehler metric $h$ coincides with the given Kaehler
metric on the zero section $M \subset T^*M$. Moreover, $h$ is invariant under
the canonical circle action on $T^*M$ by dilatations along the fibers of $T^*M$
over $M$. We show that a hyperkaehler structure with these properties is
unique. When the Kaehler metric on $M$ is real-analytic, we show that this
formal hyperkaehler structure can be extended to an open neighborhood of the
zero section. We also prove a hyperkaehler analog of the Darboux-Weinstein
Theorem. To prove these results, we use the machinery of $R$-Hodge structures,
following Deligne and Simpson.
|
[{'version': 'v1', 'created': 'Thu, 23 Oct 1997 03:14:16 GMT'}]
|
2007-05-23
|
[array(['Kaledin', 'D.', ''], dtype=object)]
|
4,060 |
1104.1035
|
Paolo Walter Cattaneo
|
P. W. Cattaneo and M. De Gerone and S. Dussoni and F. Gatti and M.
Rossella and Y. Uchiyama and R. Valle
|
The Timing Counter of the MEG experiment: calibration and performance
|
Presented at the 12th Topical Seminar on Innovative Particle and
Radiation Detectors (IPRD10) 7 - 10 June 2010, Siena. Accepted by Nuclear
Physics B (Proceedings Supplements) (2011)taly
|
Nucl.Phys.Proc.Suppl.215:281-283,2011
|
10.1016/j.nuclphysbps.2011.04.031
| null |
physics.ins-det hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The MEG detector is designed to test Lepton Flavor Violation in the
$\mu^+\rightarrow e^+\gamma$ decay down to a Branching Ratio of a few
$10^{-13}$. The decay topology consists in the coincident emission of a
monochromatic photon in direction opposite to a monochromatic positron. A
precise measurement of the relative time $t_{e^+\gamma}$ is crucial to suppress
the background. The Timing Counter (TC) is designed to precisely measure the
time of arrival of the $e^+$ and to provide information to the trigger system.
It consists of two sectors up and down stream the decay target, each consisting
of two layers. The outer one made of scintillating bars and the inner one of
scintillating fibers. Their design criteria and performances are described.
|
[{'version': 'v1', 'created': 'Wed, 6 Apr 2011 08:45:59 GMT'}]
|
2011-06-13
|
[array(['Cattaneo', 'P. W.', ''], dtype=object)
array(['De Gerone', 'M.', ''], dtype=object)
array(['Dussoni', 'S.', ''], dtype=object)
array(['Gatti', 'F.', ''], dtype=object)
array(['Rossella', 'M.', ''], dtype=object)
array(['Uchiyama', 'Y.', ''], dtype=object)
array(['Valle', 'R.', ''], dtype=object)]
|
4,061 |
1611.03866
|
Tim Schrabback
|
T. Schrabback, D. Applegate, J. P. Dietrich, H. Hoekstra, S. Bocquet,
A. H. Gonzalez, A. von der Linden, M. McDonald, C. B. Morrison, S. F. Raihan,
S. W. Allen, M. Bayliss, B. A. Benson, L. E. Bleem, I. Chiu, S. Desai, R. J.
Foley, T. de Haan, F. W. High, S. Hilbert, A. B. Mantz, R. Massey, J. Mohr,
C. L. Reichardt, A. Saro, P. Simon, C. Stern, C. W. Stubbs, A. Zenteno
|
Cluster Mass Calibration at High Redshift: HST Weak Lensing Analysis of
13 Distant Galaxy Clusters from the South Pole Telescope Sunyaev-Zel'dovich
Survey
|
49 pages, 11 tables, 38 figures. Matches the version accepted for
publication in MNRAS
| null |
10.1093/mnras/stx2666
| null |
astro-ph.CO astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an HST/ACS weak gravitational lensing analysis of 13 massive
high-redshift (z_median=0.88) galaxy clusters discovered in the South Pole
Telescope (SPT) Sunyaev-Zel'dovich Survey. This study is part of a larger
campaign that aims to robustly calibrate mass-observable scaling relations over
a wide range in redshift to enable improved cosmological constraints from the
SPT cluster sample. We introduce new strategies to ensure that systematics in
the lensing analysis do not degrade constraints on cluster scaling relations
significantly. First, we efficiently remove cluster members from the source
sample by selecting very blue galaxies in V-I colour. Our estimate of the
source redshift distribution is based on CANDELS data, where we carefully mimic
the source selection criteria of the cluster fields. We apply a statistical
correction for systematic photometric redshift errors as derived from Hubble
Ultra Deep Field data and verified through spatial cross-correlations. We
account for the impact of lensing magnification on the source redshift
distribution, finding that this is particularly relevant for shallower surveys.
Finally, we account for biases in the mass modelling caused by miscentring and
uncertainties in the concentration-mass relation using simulations. In
combination with temperature estimates from Chandra we constrain the
normalisation of the mass-temperature scaling relation ln(E(z) M_500c/10^14
M_sun)=A+1.5 ln(kT/7.2keV) to A=1.81^{+0.24}_{-0.14}(stat.) +/- 0.09(sys.),
consistent with self-similar redshift evolution when compared to lower redshift
samples. Additionally, the lensing data constrain the average concentration of
the clusters to c_200c=5.6^{+3.7}_{-1.8}.
|
[{'version': 'v1', 'created': 'Fri, 11 Nov 2016 21:00:01 GMT'}
{'version': 'v2', 'created': 'Mon, 30 Oct 2017 17:14:12 GMT'}]
|
2017-10-31
|
[array(['Schrabback', 'T.', ''], dtype=object)
array(['Applegate', 'D.', ''], dtype=object)
array(['Dietrich', 'J. P.', ''], dtype=object)
array(['Hoekstra', 'H.', ''], dtype=object)
array(['Bocquet', 'S.', ''], dtype=object)
array(['Gonzalez', 'A. H.', ''], dtype=object)
array(['von der Linden', 'A.', ''], dtype=object)
array(['McDonald', 'M.', ''], dtype=object)
array(['Morrison', 'C. B.', ''], dtype=object)
array(['Raihan', 'S. F.', ''], dtype=object)
array(['Allen', 'S. W.', ''], dtype=object)
array(['Bayliss', 'M.', ''], dtype=object)
array(['Benson', 'B. A.', ''], dtype=object)
array(['Bleem', 'L. E.', ''], dtype=object)
array(['Chiu', 'I.', ''], dtype=object)
array(['Desai', 'S.', ''], dtype=object)
array(['Foley', 'R. J.', ''], dtype=object)
array(['de Haan', 'T.', ''], dtype=object)
array(['High', 'F. W.', ''], dtype=object)
array(['Hilbert', 'S.', ''], dtype=object)
array(['Mantz', 'A. B.', ''], dtype=object)
array(['Massey', 'R.', ''], dtype=object)
array(['Mohr', 'J.', ''], dtype=object)
array(['Reichardt', 'C. L.', ''], dtype=object)
array(['Saro', 'A.', ''], dtype=object)
array(['Simon', 'P.', ''], dtype=object)
array(['Stern', 'C.', ''], dtype=object)
array(['Stubbs', 'C. W.', ''], dtype=object)
array(['Zenteno', 'A.', ''], dtype=object)]
|
4,062 |
0911.3093
|
Loet Leydesdorff
|
Loet Leydesdorff
|
Indicators of Structural Change in the Dynamics of Science: Entropy
Statistics of the SCI Journal Citation Reports
| null |
Scientometrics 53(1) (2002) 131-159
| null | null |
cs.DL physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Can change in citation patterns among journals be used as an indicator of
structural change in the organization of the sciences? Aggregated
journal-journal citations for 1999 are compared with similar data in the
Journal Citation Reports 1998 of the Science Citation Index. In addition to
indicating local change, probabilistic entropy measures enable us to analyze
changes in distributions at different levels of aggregation. The results of
various statistics are discussed and compared by elaborating the
journal-journal mappings. The relevance of this indicator for science and
technology policies is further specified.
|
[{'version': 'v1', 'created': 'Mon, 16 Nov 2009 17:39:35 GMT'}]
|
2009-11-17
|
[array(['Leydesdorff', 'Loet', ''], dtype=object)]
|
4,063 |
1809.06170
|
Gianmarco Muna\`o
|
Gianmarco Muna\`o, Antonio Pizzirusso, Andreas Kalogirou, Antonio De
Nicola, Toshihiro Kawakatsu, Florian M\"uller-Plathe and Giuseppe Milano
|
Molecular Structure and Multi-Body Potential of Mean Force in
Silica-Polystyrene Nanocomposites
|
16 pages, 11 figures, 80 references. Accepted for publication on
Nanoscale
| null | null | null |
cond-mat.soft physics.chem-ph physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a systematic application of the hybrid particle-field molecular
dynamics technique [Milano et al, J. Chem. Phys. 2009, 130, 214106] to study
interfacial properties and potential of mean force (PMF) for separating
nanoparticles (NPs) in a melt. Specifically, we consider Silica NPs bare or
grafted with Polystyrene chains, aiming to shed light on the interactions among
free and grafted chains affecting the dispersion of NPs in the nanocomposite.
The proposed hybrid models show good performances in catching the local
structure of the chains, and in particular their density profiles, documenting
the existence of the "wet-brush-to-dry-brush" transition. By using these
models, the PMF between pairs of ungrafted and grafted NPs in Polystyrene
matrix are calculated. Moreover, we estimate the three-particle contribution to
the total PMF and its role in regulating the phase separation on the nanometer
scale. In particular, the multi-particle contribution to the PMF is able to
give an explanation of the complex experimental morphologies observed at low
grafting densities. More in general, we propose this approach and the models
utilized here for a molecular understanding of specific systems and the impact
of the chemical nature of the systems on the composite final properties.
|
[{'version': 'v1', 'created': 'Mon, 17 Sep 2018 12:56:51 GMT'}]
|
2018-09-18
|
[array(['Munaò', 'Gianmarco', ''], dtype=object)
array(['Pizzirusso', 'Antonio', ''], dtype=object)
array(['Kalogirou', 'Andreas', ''], dtype=object)
array(['De Nicola', 'Antonio', ''], dtype=object)
array(['Kawakatsu', 'Toshihiro', ''], dtype=object)
array(['Müller-Plathe', 'Florian', ''], dtype=object)
array(['Milano', 'Giuseppe', ''], dtype=object)]
|
4,064 |
2012.14479
|
Taras Banakh
|
Taras Banakh and Mikhail Tkachenko
|
Weak completions of paratopological groups
|
10 pages
|
Topology Appl. 304 (2021), 107797
|
10.1016/j.topol.2021.107797
| null |
math.GR math.GN
|
http://creativecommons.org/licenses/by/4.0/
|
Given a $T_0$ paratopological group $G$ and a class $\mathcal C$ of
continuous homomorphisms of paratopological groups, we define the $\mathcal
C$-$semicompletion$ $\mathcal C[G)$ and $\mathcal C$-$completion$ $\mathcal
C[G]$ of the group $G$ that contain $G$ as a dense subgroup, satisfy the
$T_0$-separation axiom and have certain universality properties. For special
classes $\mathcal C$, we present some necessary and sufficient conditions on
$G$ in order that the (semi)completions $\mathcal C[G)$ and $\mathcal C[G]$ be
Hausdorff. Also, we give an example of a Hausdorff paratopological abelian
group $G$ whose $\mathcal C$-semicompletion $\mathcal C[G)$ fails to be a
$T_1$-space, where $\mathcal C$ is the class of continuous homomorphisms of
sequentially compact topological groups to paratopological groups. In
particular, the group $G$ contains an $\omega$-bounded sequentially compact
subgroup $H$ such that $H$ is a topological group but its closure in $G$ fails
to be a subgroup.
|
[{'version': 'v1', 'created': 'Mon, 28 Dec 2020 20:41:26 GMT'}]
|
2022-02-08
|
[array(['Banakh', 'Taras', ''], dtype=object)
array(['Tkachenko', 'Mikhail', ''], dtype=object)]
|
4,065 |
2203.09717
|
Hai N. Nguyen
|
Hai N. Nguyen, Guevara Noubir
|
Towards an AI-Driven Universal Anti-Jamming Solution with Convolutional
Interference Cancellation Network
| null | null | null | null |
cs.NI cs.CR cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Wireless links are increasingly used to deliver critical services, while
intentional interference (jamming) remains a very serious threat to such
services. In this paper, we are concerned with the design and evaluation of a
universal anti-jamming building block, that is agnostic to the specifics of the
communication link and can therefore be combined with existing technologies. We
believe that such a block should not require explicit probes, sounding,
training sequences, channel estimation, or even the cooperation of the
transmitter. To meet these requirements, we propose an approach that relies on
advances in Machine Learning, and the promises of neural accelerators and
software defined radios. We identify and address multiple challenges, resulting
in a convolutional neural network architecture and models for a multi-antenna
system to infer the existence of interference, the number of interfering
emissions and their respective phases. This information is continuously fed
into an algorithm that cancels the interfering signal. We develop a two-antenna
prototype system and evaluate our jamming cancellation approach in various
environment settings and modulation schemes using Software Defined Radio
platforms. We demonstrate that the receiving node equipped with our approach
can detect a jammer with over 99% of accuracy and achieve a Bit Error Rate
(BER) as low as $10^{-6}$ even when the jammer power is nearly two orders of
magnitude (18 dB) higher than the legitimate signal, and without requiring
modifications to the link modulation. In non-adversarial settings, our approach
can have other advantages such as detecting and mitigating collisions.
|
[{'version': 'v1', 'created': 'Fri, 18 Mar 2022 03:30:57 GMT'}]
|
2022-03-21
|
[array(['Nguyen', 'Hai N.', ''], dtype=object)
array(['Noubir', 'Guevara', ''], dtype=object)]
|
4,066 |
1710.06489
|
Alberto Sanna
|
Alberto Sanna, Mark J. Reid, Thomas M. Dame, Karl M. Menten, Andreas
Brunthaler
|
Mapping Spiral Structure on the far side of the Milky Way
|
21 pages, 5 figures, 4 tables, published in Science, October 13 issue
|
Science 13 Oct 2017: Vol. 358, Issue 6360, pp. 227-230
|
10.1126/science.aan5452
| null |
astro-ph.GA astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Little is known about the portion of the Milky Way lying beyond the Galactic
center at distances of more than 9 kilo-parsec from the Sun. These regions are
opaque at optical wavelengths due to absorption by interstellar dust, and
distances are very large and hard to measure. We report a direct trigonometric
parallax distance of 20.4_{-2.2}^{+2.8} kilo-parsec obtained with the Very Long
Baseline Array to a water maser source in a region of active star formation.
These measurements allow us to shed light on Galactic spiral structure by
locating the Scutum-Centaurus spiral arm as it passes through the far side of
the Milky Way, and to validate a kinematic method for determining distances in
this region based on transverse motions.
|
[{'version': 'v1', 'created': 'Tue, 17 Oct 2017 20:08:07 GMT'}]
|
2017-10-19
|
[array(['Sanna', 'Alberto', ''], dtype=object)
array(['Reid', 'Mark J.', ''], dtype=object)
array(['Dame', 'Thomas M.', ''], dtype=object)
array(['Menten', 'Karl M.', ''], dtype=object)
array(['Brunthaler', 'Andreas', ''], dtype=object)]
|
4,067 |
0811.2775
|
Per Sundin
|
Per Sundin
|
The AdS(4) x CP(3) string and its Bethe equations in the near plane wave
limit
|
28 pages, references and footnote added
|
JHEP 0902:046,2009
|
10.1088/1126-6708/2009/02/046
|
HU-EP-08/58
|
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a detailed study of bosonic type IIA string theory in a large
light-cone momentum / near plane wave limit of $AdS_4 \times CP_3$. In order to
attain this we derive the Hamiltonian up to cubic and quartic order in number
of fields and calculate the energies for string excitations in a $R\times S^2
\times S^2$ subspace. The computation for the string energies is performed for
arbitrary length excitations utilizing an unitary transformation which allows
us to remove the cubic terms in the Hamiltonian. We then rewrite a recent set
of proposed all loop Bethe equations in a light-cone language and compare their
predictions with the obtained string energies. We find perfect agreement.
|
[{'version': 'v1', 'created': 'Mon, 17 Nov 2008 19:29:41 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Nov 2008 12:07:23 GMT'}
{'version': 'v3', 'created': 'Sun, 23 Nov 2008 21:49:03 GMT'}]
|
2011-03-02
|
[array(['Sundin', 'Per', ''], dtype=object)]
|
4,068 |
q-alg/9512011
|
Benjamin Enriquez
|
B. Enriquez and V.N. Rubtsov
|
Compatible Poisson-Lie structures on the loop group of $SL_{2}$
|
5 pages, amstex, no figures
| null |
10.1007/BF01815525
| null |
q-alg math.QA
| null |
We define a 1-parameter family of $r$-matrices on the loop algebra of
$sl_{2}$, defining compatible Poisson structures on the associated loop group,
which degenerate into the rational and trigonometric structures, and study the
Manin triples associated to them.
|
[{'version': 'v1', 'created': 'Fri, 8 Dec 1995 15:40:23 GMT'}]
|
2009-10-28
|
[array(['Enriquez', 'B.', ''], dtype=object)
array(['Rubtsov', 'V. N.', ''], dtype=object)]
|
4,069 |
1904.06753
|
Yuxi Chen
|
Yuxi Chen, Gabor Toth, Xianzhe Jia, James Slavin, Weijie Sun, Stefano
Markidis, Tamas Gombosi, Jim Raines
|
Studying dawn-dusk asymmetries of Mercury's magnetotail using MHD-EPIC
simulations
| null | null |
10.1029/2019JA026840
| null |
physics.space-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
MESSENGER has observed a lot of dawn-dusk asymmetries in Mercury's
magnetotail, such as the asymmetries of the cross-tail current sheet thickness
and the occurrence of flux ropes, dipolarization events and energetic electron
injections. In order to obtain a global pictures of Mercury's magnetotail
dynamics and the relationship between these asymmetries, we perform global
simulations with the magnetohydrodynamics with embedded particle-in-cell
(MHD-EPIC) model, where Mercury's magnetotail region is covered by a PIC code.
Our simulations show that the dawnside current sheet is thicker, the plasma
density is larger, and the electron pressure is higher than the duskside. Under
a strong IMF driver, the simulated reconnection sites prefer the dawnside. We
also found the dipolarization events and the planetward electron jets are
moving dawnward while they are moving towards the planet, so that almost all
dipolarization events and high-speed plasma flows concentrate in the dawn
sector. The simulation results are consistent with MESSENGER observations.
|
[{'version': 'v1', 'created': 'Sun, 14 Apr 2019 20:09:58 GMT'}]
|
2020-01-08
|
[array(['Chen', 'Yuxi', ''], dtype=object)
array(['Toth', 'Gabor', ''], dtype=object)
array(['Jia', 'Xianzhe', ''], dtype=object)
array(['Slavin', 'James', ''], dtype=object)
array(['Sun', 'Weijie', ''], dtype=object)
array(['Markidis', 'Stefano', ''], dtype=object)
array(['Gombosi', 'Tamas', ''], dtype=object)
array(['Raines', 'Jim', ''], dtype=object)]
|
4,070 |
1410.6653
|
Denise Gabuzda
|
Denise C. Gabuzda, Andrea Reichstein and Eamonn L. O'Neill
|
Are Spine--Sheath Polarization Structures in the Jets of Active Galactic
Nuclei Associated with Helical Magnetic Fields?
|
15 pages, 10 figures
|
MNRAS, 444, 172 (2014)
|
10.1093/mnras/stu1381
| null |
astro-ph.GA astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One possible origin for polarization structures across jets of Active
Galactic Nuclei (AGNs) with a central "spine" of orthogonal magnetic field and
a "sheath" of longitudinal magnetic field along one or both edges of the jet is
the presence of a helical jet magnetic field. Simultaneous Very Long Baseline
Array (VLBA) polarization observations of AGN displaying partial or full
spine--sheath polarization structures were obtained at 4.6, 5.0, 7.9, 8.9, 12.9
and 15.4 GHz, in order to search for additional evidence for helical jet
magnetic fields, such as transverse Faraday rotation gradients (due to the
systematic change in the line-of-sight magnetic-field component across the
jet). Results for eight sources displaying monotonic transverse Faraday
rotation gradients with significances $\geq 3\sigma$ are presented here.
Reversals in the directions of the transverse RM gradients with distance from
the core or with time are detected in three of these AGNs. These can be
interpreted as evidence for a nested helical magnetic field structure, with
different directions for the azimuthal field component in the inner and outer
regions of helical field. The results presented here support the idea that many
spine--sheath polarization structures reflect the presence of helical magnetic
fields being carried by these jets.
|
[{'version': 'v1', 'created': 'Fri, 24 Oct 2014 11:45:52 GMT'}
{'version': 'v2', 'created': 'Tue, 28 Oct 2014 14:06:15 GMT'}]
|
2015-06-23
|
[array(['Gabuzda', 'Denise C.', ''], dtype=object)
array(['Reichstein', 'Andrea', ''], dtype=object)
array(["O'Neill", 'Eamonn L.', ''], dtype=object)]
|
4,071 |
1309.3693
|
Pramey Upadhyaya
|
Pramey Upadhyaya, Ritika Dusad, Silas Hoffman, Yaroslav Tserkovnyak,
Juan G. Alzate, Pedram Khalili Amiri, Kang L. Wang
|
Electric-field induced domain-wall dynamics: depinning and chirality
switching
|
6 pages, 6 figures
| null |
10.1103/PhysRevB.88.224422
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We theoretically study the equilibrium and dynamic properties of nanoscale
magnetic tunnel junctions (MTJs) and magnetic wires, in which an electric field
controls the magnetic anisotropy through spin-orbit coupling. By performing
micromagnetic simulations, we construct a rich phase diagram and find that, in
particular, the equilibrium magnetic textures can be tuned between Neel and
Bloch domain walls in an elliptical MTJ. Furthermore, we develop a
phenomenological model of a quasi-one-dimensional domain wall confined by a
parabolic potential and show that, near the Neel-to-Bloch-wall transition, a
pulsed electric field induces precessional domain-wall motion which can be used
to reverse the chirality of a Neel wall and even depin it. This domain-wall
motion controlled by electric fields, in lieu of applied current, may provide a
model for ultra-low-power domain-wall memory and logic devices.
|
[{'version': 'v1', 'created': 'Sat, 14 Sep 2013 19:04:50 GMT'}]
|
2015-06-17
|
[array(['Upadhyaya', 'Pramey', ''], dtype=object)
array(['Dusad', 'Ritika', ''], dtype=object)
array(['Hoffman', 'Silas', ''], dtype=object)
array(['Tserkovnyak', 'Yaroslav', ''], dtype=object)
array(['Alzate', 'Juan G.', ''], dtype=object)
array(['Amiri', 'Pedram Khalili', ''], dtype=object)
array(['Wang', 'Kang L.', ''], dtype=object)]
|
4,072 |
1608.06680
|
Baoxiang Wang
|
Kuijie Li, Tohru Ozawa and Baoxiang Wang
|
Dynamical Behavior for the Solutions of the Navier-Stokes Equation
|
45 Pages
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Cauchy problem for the incompressible Navier-Stokes equations
(NS) in three and higher spatial dimensions: \begin{align} u_t -\Delta u+u\cdot
\nabla u +\nabla p=0, \ \ {\rm div} u=0, \ \ u(0,x)= u_0(x). \label{NSa}
\end{align} Leray and Giga obtained that for the weak and mild solutions $u$ of
NS in $L^p(\mathbb{R}^d)$ which blow up at finite time $T>0$, respectively, one
has that for $d <p \leq \infty$, $$ \|u(t)\|_p \gtrsim ( T-t )^{-(1-d/p)/2}, \
\ 0< t<T. $$ We will obtain the blowup profile and the concentration phenomena
in $L^p(\mathbb{R}^d)$ with $d\leq p\leq \infty$ for the blowup mild solution.
On the other hand, if the Fourier support has the form ${\rm supp} \
\widehat{u_0} \subset \{\xi\in \mathbb{R}^n: \xi_1\geq L \}$ and
$\|u_0\|_{\infty} \ll L$ for some $L >0$, then \eqref{NSa} has a unique global
solution $u\in C(\mathbb{R}_+, L^\infty)$. Finally, if the blowup rate is of
type I: $$ \|u(t)\|_p \sim ( T-t )^{-(1-d/p)/2}, \ for \ 0< t<T<\infty, \
d<p<\infty $$ in 3 dimensional case, then we can obtain a minimal blowup
solution $\Phi$ for which $$ \inf \{\limsup_{t \to
T}(T-t)^{(1-3/p)/2}\|u(t)\|_{L^p_x}: \ u\in C([0,T); L^p) \mbox{\ solves
\eqref{NSa}}\} $$ is attainable at some $\Phi \in L^\infty (0,T; \ \dot
B^{-1+6/p}_{p/2,\infty})$.
|
[{'version': 'v1', 'created': 'Wed, 24 Aug 2016 01:09:53 GMT'}]
|
2016-08-25
|
[array(['Li', 'Kuijie', ''], dtype=object)
array(['Ozawa', 'Tohru', ''], dtype=object)
array(['Wang', 'Baoxiang', ''], dtype=object)]
|
4,073 |
1109.1895
|
Yuzhe Jin
|
Yuzhe Jin, Bhaskar D. Rao
|
Support Recovery of Sparse Signals in the Presence of Multiple
Measurement Vectors
| null | null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies the problem of support recovery of sparse signals based on
multiple measurement vectors (MMV). The MMV support recovery problem is
connected to the problem of decoding messages in a Single-Input Multiple-Output
(SIMO) multiple access channel (MAC), thereby enabling an information theoretic
framework for analyzing performance limits in recovering the support of sparse
signals. Sharp sufficient and necessary conditions for successful support
recovery are derived in terms of the number of measurements per measurement
vector, the number of nonzero rows, the measurement noise level, and especially
the number of measurement vectors. Through the interpretations of the results,
in particular the connection to the multiple output communication system, the
benefit of having MMV for sparse signal recovery is illustrated providing a
theoretical foundation to the performance improvement enabled by MMV as
observed in many existing simulation results. In particular, it is shown that
the structure (rank) of the matrix formed by the nonzero entries plays an
important role on the performance limits of support recovery.
|
[{'version': 'v1', 'created': 'Fri, 9 Sep 2011 05:46:35 GMT'}]
|
2011-09-12
|
[array(['Jin', 'Yuzhe', ''], dtype=object)
array(['Rao', 'Bhaskar D.', ''], dtype=object)]
|
4,074 |
1904.11833
|
Gleydson Chaves Ricarte
|
G.C. Ricarte
|
Optimal C^{1,\apha} regularity for degenerate fully nonlinear elliptic
equations with Neumann boundary condition
|
18 pages. arXiv admin note: text overlap with arXiv:1201.3739,
arXiv:1407.2874, arXiv:1803.07852 by other authors
|
Nonlinear Analysis 2020
| null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present paper, we study sharp C^{1;\alpha} regularity results with
boundary Neumann condition for viscosity solutions for a class of degenerate
fully non-linear elliptic equations with Neumann boundary conditions.
|
[{'version': 'v1', 'created': 'Thu, 25 Apr 2019 17:40:25 GMT'}
{'version': 'v2', 'created': 'Tue, 11 Aug 2020 16:10:34 GMT'}]
|
2020-08-12
|
[array(['Ricarte', 'G. C.', ''], dtype=object)]
|
4,075 |
2201.11048
|
Xinwen Shu
|
W. J. Zhang, X. W. Shu, Z. F. Sheng, L. M. Sun, L. M. Dou, N. Jiang,
J. G. Wang, X. Y. Hu, Y. B. Wang, and T. G. Wang
|
Discovery of late-time X-ray flare and anomalous emission line
enhancement after the nuclear optical outburst in a narrow-line Seyfert 1
Galaxy
|
Accepted for publication in A&A, 16 pages, 16 figures and 4 Tables
|
A&A 660, A119 (2022)
|
10.1051/0004-6361/202142253
| null |
astro-ph.HE astro-ph.GA
|
http://creativecommons.org/licenses/by/4.0/
|
CSS J102913+404220 is a peculiar narrow line Seyfert 1 galaxy with an
energetic nuclear optical outburst. We present a detailed analysis of its
multi-wavelength photometric and spectroscopic observations covering a period
of decade since outburst. We detect mid-infrared (MIR) flares delayed by about
two months relative to the optical outburst, with an extremely high peak
luminosity of log(L_4.6um)>44 erg/s. The MIR peak luminosity is at least an
order of magnitude higher than any known supernovae explosions, suggesting the
optical outburst might be due to a stellar tidal disruption event (TDE). We
find late-time X-ray brightening by a factor of >30 with respect to what is
observed about 100 days after the optical outburst peak, followed by a flux
fading by a factor of ~4 within two weeks, making it one of Active Galactic
Nuclei (AGNs) with extreme variability. Despite the dramatic X-ray variability,
there are no coincident strong flux variations in optical, UV and MIR bands.
This unusual variability behavior has been seen in other highly accreting AGNs
and could be attributed to absorption variability. In this scenario, the
decrease in the covering factor of absorber with accretion rate could cause the
X-ray brightening, possibly induced by the TDE. Most strikingly, while the
UV/optical continuum remains little changes with time, an evident enhancement
in the flux of H_alpha broad emission line is observed, about a decade after
the nuclear optical outburst, which is an anomalous behavior never seen in any
other AGNs. Such an H_alpha anomaly could be explained by the replenishment of
gas clouds and excitation within Broad Line Region (BLR) that originates,
perhaps from the interaction of outflowing stellar debris with BLR. The results
highlight the importance of late-time evolution of TDE that could affect the
accreting properties of AGN, as suggested by recent simulations.
|
[{'version': 'v1', 'created': 'Wed, 26 Jan 2022 16:43:43 GMT'}]
|
2022-04-27
|
[array(['Zhang', 'W. J.', ''], dtype=object)
array(['Shu', 'X. W.', ''], dtype=object)
array(['Sheng', 'Z. F.', ''], dtype=object)
array(['Sun', 'L. M.', ''], dtype=object)
array(['Dou', 'L. M.', ''], dtype=object)
array(['Jiang', 'N.', ''], dtype=object)
array(['Wang', 'J. G.', ''], dtype=object)
array(['Hu', 'X. Y.', ''], dtype=object)
array(['Wang', 'Y. B.', ''], dtype=object)
array(['Wang', 'T. G.', ''], dtype=object)]
|
4,076 |
2005.13385
|
Xian-Min Jin
|
Xiao-Yun Xu, Xiao-Wei Wang, Dan-Yang Chen, C. Morais Smith, Xian-Min
Jin
|
Shining Light on Quantum Transport in Fractal Networks
|
45 pages, 21 figures, comments welcome!
| null | null | null |
quant-ph cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fractals are fascinating structures, not only for their aesthetic appeal, but
also because they allow for the investigation of physical properties in
non-integer dimensions. In these unconventional systems, a myriad of intrinsic
features might come into play, such as the fractal dimension, the spectral
dimension, or the fractal geometry. Despite abundant theoretical and numerical
studies, experiments in fractal networks remain elusive. Here, we
experimentally investigate quantum transport in fractal networks by performing
continuous-time quantum walks in fractal photonic lattices with incremental
propagation lengths. Photons act as the walkers and evolve in the lattices
after being injected into one initial site. We unveil the transport properties
through the photon evolution pattern at different propagation lengths and the
analysis of the variance and the P'olya number, which are calculated based on
the probability distribution of the patterns. Contrarily to classical fractals,
we observe anomalous transport governed solely by the fractal dimension. In
addition, the critical point at which there is a transition from normal to
anomalous transport is highly dependent on the fractal geometry. Our experiment
allows the verification of physical laws in a quantitative manner and reveals
the transport dynamics with unprecedented detail, thus opening a path to the
understanding of more complex quantum phenomena governed by fractality.
|
[{'version': 'v1', 'created': 'Wed, 27 May 2020 14:28:28 GMT'}]
|
2020-05-28
|
[array(['Xu', 'Xiao-Yun', ''], dtype=object)
array(['Wang', 'Xiao-Wei', ''], dtype=object)
array(['Chen', 'Dan-Yang', ''], dtype=object)
array(['Smith', 'C. Morais', ''], dtype=object)
array(['Jin', 'Xian-Min', ''], dtype=object)]
|
4,077 |
2208.05013
|
Melanie Weber
|
Melanie Weber and Suvrit Sra
|
Computing Brascamp-Lieb Constants through the lens of Thompson Geometry
|
Under Review
| null | null | null |
math.OC cs.CC cs.DS math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies algorithms for efficiently computing Brascamp-Lieb
constants, a task that has recently received much interest. In particular, we
reduce the computation to a nonlinear matrix-valued iteration, whose
convergence we analyze through the lens of fixed-point methods under the
well-known Thompson metric. This approach permits us to obtain (weakly)
polynomial time guarantees, and it offers an efficient and transparent
alternative to previous state-of-the-art approaches based on Riemannian
optimization and geodesic convexity.
|
[{'version': 'v1', 'created': 'Tue, 9 Aug 2022 19:31:59 GMT'}
{'version': 'v2', 'created': 'Tue, 11 Oct 2022 00:14:54 GMT'}]
|
2022-10-12
|
[array(['Weber', 'Melanie', ''], dtype=object)
array(['Sra', 'Suvrit', ''], dtype=object)]
|
4,078 |
1512.07870
|
Vladimir Tuz
|
Vladimir R. Tuz
|
Polaritons dispersion in a composite ferrite-semiconductor structure
near gyrotropic-nihility state
|
21 pages, 3 figures
|
Journal of Magnetism and Magnetic Materials 419 (2016) 559-565
|
10.1016/j.jmmm.2016.06.070
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of polaritons in a ferrite-semiconductor structure which is
influenced by an external static magnetic field, the gyrotropic-nihility can be
identified from the dispersion equation related to bulk polaritons as a
particular extreme state, at which the longitudinal component of the
corresponding constitutive tensor and bulk constant simultaneously acquire
zero. Near the frequency of the gyrotropic-nihility state, the conditions of
branches merging of bulk polaritons, as well as an anomalous dispersion of bulk
and surface polaritons are found and discussed.
|
[{'version': 'v1', 'created': 'Thu, 24 Dec 2015 17:35:43 GMT'}
{'version': 'v2', 'created': 'Sat, 25 Jun 2016 20:55:27 GMT'}]
|
2016-07-28
|
[array(['Tuz', 'Vladimir R.', ''], dtype=object)]
|
4,079 |
quant-ph/0606030
|
Toyohiro Tsurumaru
|
Toyohiro Tsurumaru
|
Group Covariant Protocols for Quantum String Commitment
|
5 pages, no figure, typos corrected
|
Phys. Rev. A, 74, 042307 (2006)
|
10.1103/PhysRevA.74.042307
| null |
quant-ph
| null |
We study the security of quantum string commitment (QSC) protocols with group
covariant encoding scheme. First we consider a class of QSC protocol, which is
general enough to incorporate all the QSC protocols given in the preceding
literatures. Then among those protocols, we consider group covariant protocols
and show that the exact upperbound on the binding condition can be calculated.
Next using this result, we prove that for every irreducible representation of a
finite group, there always exists a corresponding nontrivial QSC protocol which
reaches a level of security impossible to achieve classically.
|
[{'version': 'v1', 'created': 'Mon, 5 Jun 2006 08:42:39 GMT'}
{'version': 'v2', 'created': 'Mon, 16 Oct 2006 07:06:37 GMT'}]
|
2007-05-23
|
[array(['Tsurumaru', 'Toyohiro', ''], dtype=object)]
|
4,080 |
hep-th/9412230
|
7353
|
E. Brezin, S. Hikami and A.Zee
|
Universal correlations for deterministic plus random Hamiltonians
|
26P, (+5 figures not included)
| null |
10.1103/PhysRevE.51.5442
|
LPTENS-94-35,NSF-ITP-94-135,UT-KOMABA-94-21
|
hep-th cond-mat
| null |
We consider the (smoothed) average correlation between the density of energy
levels of a disordered system, in which the Hamiltonian is equal to the sum of
a deterministic H0 and of a random potential $\varphi$. Remarkably, this
correlation function may be explicitly determined in the limit of large
matrices, for any unperturbed H0 and for a class of probability distribution
P$(\varphi)$ of the random potential. We find a compact representation of the
correlation function. From this representation one obtains readily the short
distance behavior, which has been conjectured in various contexts to be
universal. Indeed we find that it is totally independent of both H0 and
P($\varphi$).
|
[{'version': 'v1', 'created': 'Thu, 29 Dec 1994 09:25:16 GMT'}]
|
2009-10-28
|
[array(['Brezin', 'E.', ''], dtype=object)
array(['Hikami', 'S.', ''], dtype=object)
array(['Zee', 'A.', ''], dtype=object)]
|
4,081 |
1812.07541
|
Zaza Osmanov
|
G. Gutishvili and Z. Osmanov
|
On the shear flow instability in the great red spot of Jupiter
|
9 pages, 5 figures
| null | null | null |
astro-ph.EP physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present paper we study instability caused by the velocity shear flows
of the great red spot of Jupiter. For the purpose, we imply the Navier Stokes
and the continuity equations, perform the linear analysis of the governing
equations and numerically solve them. We have considered two different regimes:
exponential and harmonic behaviour of wave vectors. It has been shown that both
scenarios reveal unstable character of flows and the corresponding rate might
be considerably high. For the case of harmonic time dependence of wave vectors
we also found a beat like solution of sound waves.
|
[{'version': 'v1', 'created': 'Tue, 18 Dec 2018 18:18:53 GMT'}
{'version': 'v2', 'created': 'Wed, 6 Nov 2019 05:35:03 GMT'}
{'version': 'v3', 'created': 'Thu, 7 Nov 2019 06:28:09 GMT'}]
|
2019-11-11
|
[array(['Gutishvili', 'G.', ''], dtype=object)
array(['Osmanov', 'Z.', ''], dtype=object)]
|
4,082 |
cond-mat/0005154
|
Joerg Buenemann
|
J. Buenemann
|
Spin-Waves in itinerant ferromagnets
|
29 pages, 4 figures, submitted to J. Phys. Cond. Matt
| null |
10.1088/0953-8984/13/22/324
| null |
cond-mat.str-el
| null |
We introduce a novel approach for the investigation of spin-wave excitations
in itinerant ferromagnets. Our theory is based on a variational treatment of
general multi-band Hubbard models which describe elements and compounds of
transition metals. The magnon dispersion is derived approximately as the energy
of a variational spin-wave state in the limit of large spatial dimensions. A
numerical evaluation of our results is feasible for general multi-band models.
As a first application we consider a model with two degenerate orbitals per
lattice site. From our results we can conclude that spin-wave excitations in
strong itinerant ferromagnets are very similar to those in ferromagnetic spin
systems.
|
[{'version': 'v1', 'created': 'Tue, 9 May 2000 14:58:30 GMT'}]
|
2009-10-31
|
[array(['Buenemann', 'J.', ''], dtype=object)]
|
4,083 |
cond-mat/0410231
|
Ki Seok Kim
|
Ki-Seok Kim
|
Quantum phase transition in one dimensional extended Kondo lattice model
away from half filling
| null | null | null | null |
cond-mat.str-el
| null |
We study one dimensional {\it extended} Kondo lattice model, described by the
$t-J$ Hamiltonian for conduction electrons away from half filling and the
Heisenberg Hamiltonian for localized spins at half filling. Following
Shankar,\cite{Shankar} we find an effective field theory for this model, where
doped holes are represented by massless Dirac fermions (holons) and spin
excitations are fractionalized into relativistic bosons (spinons). These holons
and spinons interact via U(1) gauge fluctuations. Effects of Berry phase to the
localized spins disappear due to the presence of Kondo couplings, causing the
spinon excitations gapped. Furthermore, the gauge fluctuations are suppressed
by hole doping. As a result, massive spinons are deconfined to arise in the
localized spins unless the Kondo hybridization is strong enough. When the Kondo
hybridization strength exceeds a certain value, we find that the localized spin
chain becomes critical. This indicates that the present one dimensional Kondo
lattice model exhibits a phase transition from a spin-gapped phase to a
critical state in the localized spin chain, driven by the Kondo interaction.
|
[{'version': 'v1', 'created': 'Sun, 10 Oct 2004 03:00:23 GMT'}
{'version': 'v2', 'created': 'Fri, 25 Feb 2005 08:16:46 GMT'}
{'version': 'v3', 'created': 'Thu, 10 Aug 2006 01:46:42 GMT'}]
|
2007-05-23
|
[array(['Kim', 'Ki-Seok', ''], dtype=object)]
|
4,084 |
1604.05676
|
Ramses van Zon
|
Marcelo Ponce, Erik Spence, Daniel Gruner, Ramses van Zon
|
Scientific Computing, High-Performance Computing and Data Science in
Higher Education
|
Updated discussion and title
|
Journal of Computational Science Education vol 10 (2019)
|
10.22369/issn.2153-4136/10/1/5
| null |
cs.CY cs.DC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an overview of current academic curricula for Scientific
Computing, High-Performance Computing and Data Science. After a survey of
current academic and non-academic programs across the globe, we focus on
Canadian programs and specifically on the education program of the SciNet HPC
Consortium, using its detailed enrollment and course statistics for the past
four to five years. Not only do these data display a steady and rapid increase
in the demand for research-computing instruction, they also show a clear shift
from traditional (high performance) computing to data-oriented methods. It is
argued that this growing demand warrants specialized research computing
degrees. The possible curricula of such degrees are described next, taking
existing programs as an example, and adding SciNet's experiences of student
desires as well as trends in advanced research computing.
|
[{'version': 'v1', 'created': 'Tue, 19 Apr 2016 18:06:37 GMT'}
{'version': 'v2', 'created': 'Thu, 16 Jun 2016 15:27:46 GMT'}]
|
2019-01-17
|
[array(['Ponce', 'Marcelo', ''], dtype=object)
array(['Spence', 'Erik', ''], dtype=object)
array(['Gruner', 'Daniel', ''], dtype=object)
array(['van Zon', 'Ramses', ''], dtype=object)]
|
4,085 |
2006.08036
|
Marcos Prates O
|
Victor H. Lachos Davila, Marcos O. Prates, Dipak K. Dey
|
Heckman selection-t model: parameter estimation via the EM-algorithm
|
19 pages, 5 Tables, 4 Figures
| null | null | null |
stat.ME stat.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Heckman selection model is perhaps the most popular econometric model in the
analysis of data with sample selection. The analyses of this model are based on
the normality assumption for the error terms, however, in some applications,
the distribution of the error term departs significantly from normality, for
instance, in the presence of heavy tails and/or atypical observation. In this
paper, we explore the Heckman selection-t model where the random errors follow
a bivariate Student's-t distribution. We develop an analytically tractable and
efficient EM-type algorithm for iteratively computing maximum likelihood
estimates of the parameters, with standard errors as a by-product. The
algorithm has closed-form expressions at the E-step, that rely on formulas for
the mean and variance of the truncated Student's-t distributions. Simulations
studies show the vulnerability of the Heckman selection-normal model, as well
as the robustness aspects of the Heckman selection-t model. Two real examples
are analyzed, illustrating the usefulness of the proposed methods. The proposed
algorithms and methods are implemented in the new R package HeckmanEM.
|
[{'version': 'v1', 'created': 'Sun, 14 Jun 2020 21:59:20 GMT'}]
|
2020-06-16
|
[array(['Davila', 'Victor H. Lachos', ''], dtype=object)
array(['Prates', 'Marcos O.', ''], dtype=object)
array(['Dey', 'Dipak K.', ''], dtype=object)]
|
4,086 |
1609.07428
|
Katya Scheinberg
|
Jose Blanchet, Coralia Cartis, Matt Menickelly, Katya Scheinberg
|
Convergence Rate Analysis of a Stochastic Trust Region Method via
Submartingales
|
22 pages. arXiv admin note: text overlap with arXiv:1504.04231
| null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a novel framework for analyzing convergence rates of stochastic
optimization algorithms with adaptive step sizes. This framework is based on
analyzing properties of an underlying generic stochastic process, in particular
by deriving a bound on the expected stopping time of this process. We utilize
this framework to analyze the bounds on expected global convergence rates of a
stochastic variant of a traditional trust region method, introduced in
\cite{ChenMenickellyScheinberg2014}. While traditional trust region methods
rely on exact computations of the gradient, Hessian and values of the objective
function, this method assumes that these values are available up to some
dynamically adjusted accuracy. Moreover, this accuracy is assumed to hold only
with some sufficiently large, but fixed, probability, without any additional
restrictions on the variance of the errors. This setting applies, for example,
to standard stochastic optimization and machine learning formulations.
Improving upon the analysis in \cite{ChenMenickellyScheinberg2014}, we show
that the stochastic process defined by the algorithm satisfies the assumptions
of our proposed general framework, with the stopping time defined as reaching
accuracy $\|\nabla f(x)\|\leq \epsilon$. The resulting bound for this stopping
time is $O(\epsilon^{-2})$, under the assumption of sufficiently accurate
stochastic gradient, and is the first global complexity bound for a stochastic
trust-region method. Finally, we apply the same framework to derive second
order complexity bound under some additional assumptions.
|
[{'version': 'v1', 'created': 'Fri, 23 Sep 2016 16:55:01 GMT'}
{'version': 'v2', 'created': 'Thu, 8 Feb 2018 18:55:52 GMT'}
{'version': 'v3', 'created': 'Fri, 19 Oct 2018 21:26:55 GMT'}]
|
2018-10-23
|
[array(['Blanchet', 'Jose', ''], dtype=object)
array(['Cartis', 'Coralia', ''], dtype=object)
array(['Menickelly', 'Matt', ''], dtype=object)
array(['Scheinberg', 'Katya', ''], dtype=object)]
|
4,087 |
1409.3127
|
Georgy Sharygin I.
|
Igor Korepanov, Georgy Sharygin and Dmitry Talalaev
|
Cohomologies of $n$-simplex relations
|
25 pages, 4 figures; v3: added the proof of nontriviality in Example
2, formulas in this example corrected
| null |
10.1017/S030500411600030X
| null |
math-ph math.AT math.MP math.QA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A theory of (co)homologies related to set-theoretic $n$-simplex relations is
constructed in analogy with the known quandle and Yang--Baxter (co)homologies,
with emphasis made on the tetrahedron case. In particular, this permits us to
generalize Hietarinta's idea of "permutation-type" solutions to the quantum (or
"tensor") $n$-simplex equations. Explicit examples of solutions to the
tetrahedron equation involving nontrivial cocycles are presented.
|
[{'version': 'v1', 'created': 'Wed, 10 Sep 2014 15:55:22 GMT'}
{'version': 'v2', 'created': 'Fri, 24 Oct 2014 13:31:51 GMT'}
{'version': 'v3', 'created': 'Thu, 18 Dec 2014 18:13:04 GMT'}]
|
2016-05-23
|
[array(['Korepanov', 'Igor', ''], dtype=object)
array(['Sharygin', 'Georgy', ''], dtype=object)
array(['Talalaev', 'Dmitry', ''], dtype=object)]
|
4,088 |
1111.6795
|
Francois Peters
|
Fr\'ed\'eric Blanc (LPMC), Fran\c{c}ois Peters (LPMC), Elisabeth
Lemaire (LPMC)
|
Local transient rheological behavior of concentrated suspensions
| null |
Journal of Rheology -New York- 55, 4 (2011) 835
|
10.1122/1.3582848
| null |
physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper reports experiments on the shear transient response of
concentrated non-Brownian suspensions. The shear viscosity of the suspensions
is measured using a wide-gap Couette rheometer equipped with a Particle Image
Velocimetry (PIV) device that allows measuring the velocity field. The
suspensions made of PMMA particles (31$\mu$m in diameter) suspended in a
Newtonian index- and density-matched liquid are transparent enough to allow an
accurate measurement of the local velocity for particle concentrations as high
as 50%. In the wide-gap Couette cell, the shear induced particle migration is
evidenced by the measurement of the time evolution of the flow profile. A
peculiar radial zone in the gap is identified where the viscosity remains
constant. At this special location, the local particle volume fraction is taken
to be the mean particle concentration. The local shear transient response of
the suspensions when the shear flow is reversed is measured at this point where
the particle volume fraction is well defined. The local rheological
measurements presented here confirm the macroscopic measurements of
Gadala-Maria and Acrivos (1980). After shear reversal, the viscosity undergoes
a step-like reduction, decreases slower and passes through a minimum before
increasing again to reach a plateau. Upon varying the particle concentration,
we have been able to show that the minimum and the plateau viscosities do not
obey the same scaling law with respect to the particle volume fraction. These
experimental results are consistent with the scaling predicted by Mills and
Snabre (2009) and with the results of numerical simulation performed on random
suspensions [Sierou and Brady (2001)]. The minimum seems to be associated with
the viscosity of an isotropic suspension, or at least of a suspension whose
particles do not interact through non-hydrodynamic forces, while the plateau
value would correspond to the viscosity of a suspension structured by the shear
where the non-hydrodynamic forces play a crucial role.
|
[{'version': 'v1', 'created': 'Tue, 29 Nov 2011 12:39:50 GMT'}]
|
2015-06-03
|
[array(['Blanc', 'Frédéric', '', 'LPMC'], dtype=object)
array(['Peters', 'François', '', 'LPMC'], dtype=object)
array(['Lemaire', 'Elisabeth', '', 'LPMC'], dtype=object)]
|
4,089 |
1912.00887
|
Neda Darvishi
|
Neda Darvishi and Apostolos Pilaftsis
|
Classifying Accidental Symmetries in Multi-Higgs Doublet Models
|
33 pages and 2 tables
|
Phys. Rev. D 101, 095008 (2020)
|
10.1103/PhysRevD.101.095008
|
MAN/HEP/2019/009
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The potential of $n$-Higgs Doublet Models ($n$HDMs) contains a large number
of SU(2)$_L$-preserving accidental symmetries as subgroups of the symplectic
group Sp(2$n)$. To classify these, we introduce prime invariants and
irreducible representations in bilinear field space that enable us to
explicitly construct accidentally symmetric $n$HDM potentials. We showcase the
classifications of symmetries and present the relationship among the
theoretical parameters of the scalar potential for; (i) the Two Higgs Doublet
Model (2HDM) and (ii) the Three Higgs Doublet Model (3HDM). We recover the
maximum number of $13$ accidental symmetries for the 2HDM potential and for the
first time, we present the complete list of $40$ accidental symmetries for the
3HDM potential.
|
[{'version': 'v1', 'created': 'Mon, 2 Dec 2019 16:09:06 GMT'}
{'version': 'v2', 'created': 'Fri, 13 Mar 2020 12:37:50 GMT'}
{'version': 'v3', 'created': 'Sun, 10 May 2020 12:53:43 GMT'}]
|
2020-05-12
|
[array(['Darvishi', 'Neda', ''], dtype=object)
array(['Pilaftsis', 'Apostolos', ''], dtype=object)]
|
4,090 |
1506.07655
|
Stephan Krapick
|
Stephan Krapick and Christine Silberhorn
|
Analysis of photon triplet generation in pulsed cascaded parametric
down-conversion sources
|
12 pages, 3 figures, 1 table
| null | null | null |
quant-ph physics.data-an physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the generation rates and preparation fidelities of photon triplet
states in pulsed cascaded parametric down-conversion (PDC) under realistic
experimental circumstances. As a model system, we assume a monolithically
integrated device with negligible interface loss between the two consecutive
PDC stages. We model the secondary down-conversion process in terms of a lossy
channel and provide a detailed analysis of noise contributions. Taking variable
pump powers into account, we estimate the impact of higher-order photon
contributions and conversion processes on the achievable coincidence
probabilities. At mean photon numbers of $\langle m\rangle\sim0.25$ photons per
pulse behind the first PDC stage, we expect around $4.0$ genuine photon
triplets per hour. Additionally, we discuss fundamental limitations of our
model system as well as feasible improvements to the detectable photon triplet
rate.
|
[{'version': 'v1', 'created': 'Thu, 25 Jun 2015 08:06:35 GMT'}]
|
2015-06-26
|
[array(['Krapick', 'Stephan', ''], dtype=object)
array(['Silberhorn', 'Christine', ''], dtype=object)]
|
4,091 |
1408.4868
|
Henry Hsieh
|
Henry H. Hsieh
|
Main-belt comets as tracers of ice in the inner Solar system
|
7 pages, 2 figures; published in Proceedings of the International
Astronomical Union; IAU Symposium: Formation, Detection, and Characterization
of Extrasolar Habitable Planets
|
Proc. IAU Symposium (2014), 293, 212-218
|
10.1017/S1743921313012866
| null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As a recently recognized class of objects exhibiting apparently cometary
(sublimation-driven) activity yet orbiting completely within the main asteroid
belt, main-belt comets (MBCs) have revealed the existence of present-day ice in
small bodies in the inner solar system and offer an opportunity to better
understand the thermal and compositional history of our solar system, and by
extension, those of other planetary systems as well. Achieving these overall
goals, however, will require meeting various intermediate research objectives,
including discovering many more MBCs than the currently known seven objects in
order to ascertain the population's true abundance and distribution, confirming
that water ice sublimation is in fact the driver of activity in these objects,
and improving our understanding of the physical, dynamical, and thermal
evolutionary processes that have acted on this population over the age of the
solar system.
|
[{'version': 'v1', 'created': 'Thu, 21 Aug 2014 03:33:28 GMT'}]
|
2014-08-22
|
[array(['Hsieh', 'Henry H.', ''], dtype=object)]
|
4,092 |
1303.0855
|
Tjonnie Guang Feng Li
|
T. G. F. Li, W. Del Pozzo, C. Messenger
|
Measuring the redshift of standard sirens using the neutron star
deformability
|
3 pages, 1 figure, Marcel Grossmann 13
| null | null | null |
gr-qc astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A recent study has shown that redshift information can be directly extracted
from gravitational wave sources. This can be done by exploiting the tidal
phasing contributions to the waveform during the inspiral phase of binary
neutron stars coalescences. The original study investigated the viability of
this idea in the context of the Einstein Telescope using a Fisher Matrix
approach and in this paper, we further explore this idea using realistic
simulations and Bayesian inference techniques. We find that the fractional
accuracy with which the redshift can be measured is in the order of tens of
percent, in agreement with Fisher Matrix predictions. Moreover, no significant
bias is found. We conclude that, when tidal phasing contributions are included
in the analysis, inference of the cosmological parameters from gravitational
waves is possible
|
[{'version': 'v1', 'created': 'Mon, 4 Mar 2013 21:11:06 GMT'}]
|
2013-03-06
|
[array(['Li', 'T. G. F.', ''], dtype=object)
array(['Del Pozzo', 'W.', ''], dtype=object)
array(['Messenger', 'C.', ''], dtype=object)]
|
4,093 |
1804.04873
|
Vyacheslav Yukalov
|
V.I. Yukalov
|
Dipolar and spinor bosonic systems
|
latex file, 87 pages, 4 figures
|
Laser Phys. 28 (2018) 053001
|
10.1088/1555-6611/aa9150
| null |
cond-mat.quant-gas cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The main properties and methods of describing dipolar and spinor atomic
systems, composed of bosonic atoms or molecules, are reviewed. The general
approach for the correct treatment of Bose-condensed atomic systems with
nonlocal interaction potentials is explained. The approach is applied to
Bose-condensed systems with dipolar interaction potentials. The properties of
systems with spinor interaction potentials are described. Trapped atoms and
atoms in optical lattices are considered. Effective spin Hamiltonians for atoms
in optical lattices are derived. The possibility of spintronics with cold atom
is emphasized. The present review differs from the previous review articles by
concentrating on a thorough presentation of basic theoretical points, helping
the reader to better follow mathematical details and to make clearer physical
conclusions.
|
[{'version': 'v1', 'created': 'Fri, 13 Apr 2018 10:15:03 GMT'}
{'version': 'v2', 'created': 'Mon, 16 Apr 2018 14:45:20 GMT'}]
|
2018-05-09
|
[array(['Yukalov', 'V. I.', ''], dtype=object)]
|
4,094 |
2305.16122
|
Gilles Bareilles
|
Johannes Aspman and Gilles Bareilles and Vyacheslav Kungurtsev and
Jakub Marecek and Martin Tak\'a\v{c}
|
Hybrid Methods in Polynomial Optimisation
| null | null | null | null |
math.OC
|
http://creativecommons.org/publicdomain/zero/1.0/
|
The Moment/Sum-of-squares hierarchy provides a way to compute the global
minimizers of polynomial optimization problems (POP), at the cost of solving a
sequence of increasingly large semidefinite programs (SDPs). We consider
large-scale POPs, for which interior-point methods are no longer able to solve
the resulting SDPs. We propose an algorithm that combines a first-order
Burer-Monteiro-type method for solving the SDP relaxation, and a second-order
method on a non-convex problem obtained from the POP. The switch from the first
to the second-order method is based on a quantitative criterion, whose
satisfaction ensures that Newton's method converges quadratically from its
first iteration. This criterion leverages the point-estimation theory of Smale
and the active-set identification. We illustrate the methodology to obtain
global minimizers of large-scale optimal power flow problems.
|
[{'version': 'v1', 'created': 'Thu, 25 May 2023 14:55:36 GMT'}
{'version': 'v2', 'created': 'Fri, 2 Jun 2023 15:35:58 GMT'}]
|
2023-06-05
|
[array(['Aspman', 'Johannes', ''], dtype=object)
array(['Bareilles', 'Gilles', ''], dtype=object)
array(['Kungurtsev', 'Vyacheslav', ''], dtype=object)
array(['Marecek', 'Jakub', ''], dtype=object)
array(['Takáč', 'Martin', ''], dtype=object)]
|
4,095 |
0907.1872
|
Paolo Giordano
|
Paolo Giordano
|
Fermat Reals - Nilpotent Infinitesimals and Infinite Dimensional Spaces
| null | null | null | null |
math.DG math.GM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
F.: Good morning Hermann, I would like to talk with you about infinitesimals.
G.: Tell me Pierre.
F.: I'm fed up of all these slanders about my attitude to be non rigorous, so
I've started to study nonstandard analysis (NSA) and synthetic differential
geometry (SDG).
G.: Yes, I've read something ...
F.: Ok, no problem about their rigour. But, when I've seen that the sine of
an infinite in NSA is infinitely near to a real number I was astonished: what
is the intuitive meaning of this number, if any? Then, I've seen that to work
in SDG I must learn to work in intuitionistic logic ... You know, I love
margins of books, and I don't want to loose too much time, I have many things
to do ...
G.: In SDG they also say that every infinitesimal is at the same time
positive and negative, what is the meaning of all these? And why does the
square of a first order infinitesimal equal zero, whereas the product of two
first order infinitesimals is not necessarily zero? And do you know that from
any single infinitesimal in NSA is possible to construct a non measurable set?
Without using the axiom of choice!
F.: Yes, I know, I know ... Ok, listen: why cannot we start from standard
real functions of one real variable and use ...
This work is the ideal continuation of this dialogue: a theory of actual
infinitesimals that do not need a background of formal logic to be understood,
with a clear intuitive meaning and with non trivial applications to
differential geometry of both finite and infinite dimensional spaces.
|
[{'version': 'v1', 'created': 'Fri, 10 Jul 2009 17:23:25 GMT'}]
|
2009-07-13
|
[array(['Giordano', 'Paolo', ''], dtype=object)]
|
4,096 |
1907.06725
|
Sayanti Roy
|
Sayanti Roy, Emily Kieson, Charles Abramson, Christopher Crick
|
Mutual Reinforcement Learning
| null | null | null | null |
cs.RO cs.HC cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, collaborative robots have begun to train humans to achieve complex
tasks, and the mutual information exchange between them can lead to successful
robot-human collaborations. In this paper we demonstrate the application and
effectiveness of a new approach called mutual reinforcement learning (MRL),
where both humans and autonomous agents act as reinforcement learners in a
skill transfer scenario over continuous communication and feedback. An
autonomous agent initially acts as an instructor who can teach a novice human
participant complex skills using the MRL strategy. While teaching skills in a
physical (block-building) ($n=34$) or simulated (Tetris) environment ($n=31$),
the expert tries to identify appropriate reward channels preferred by each
individual and adapts itself accordingly using an exploration-exploitation
strategy. These reward channel preferences can identify important behaviors of
the human participants, because they may well exercise the same behaviors in
similar situations later. In this way, skill transfer takes place between an
expert system and a novice human operator. We divided the subject population
into three groups and observed the skill transfer phenomenon, analyzing it with
Simpson"s psychometric model. 5-point Likert scales were also used to identify
the cognitive models of the human participants. We obtained a shared cognitive
model which not only improves human cognition but enhances the robot's
cognitive strategy to understand the mental model of its human partners while
building a successful robot-human collaborative framework.
|
[{'version': 'v1', 'created': 'Mon, 15 Jul 2019 20:10:29 GMT'}
{'version': 'v2', 'created': 'Wed, 7 Aug 2019 00:42:57 GMT'}
{'version': 'v3', 'created': 'Fri, 20 Sep 2019 19:52:13 GMT'}]
|
2019-09-24
|
[array(['Roy', 'Sayanti', ''], dtype=object)
array(['Kieson', 'Emily', ''], dtype=object)
array(['Abramson', 'Charles', ''], dtype=object)
array(['Crick', 'Christopher', ''], dtype=object)]
|
4,097 |
1409.7512
|
Estelle Pitard
|
G. Augustins, L. Etienne, J-B. Ferdy, R. Ferrer, B. Godelle, E.
Pitard, F. Rousset
|
The evolution of wealth transmission in human populations: a stochastic
model
|
5 pages, 3 figures
|
Journal of Physics: Conference series, 490, 012052 (2014)
|
10.1088/1742-6596/490/1/012052
| null |
physics.soc-ph q-bio.PE q-fin.GN
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Reproductive success and survival are influenced by wealth in human
populations. Wealth is transmitted to offsprings and strategies of transmission
vary over time and among populations, the main variation being how equally
wealth is transmitted to children. Here we propose a model where we simulate
both the dynamics of wealth in a population and the evolution of a trait that
determines how wealth is transmitted from parents to offspring, in a darwinian
context.
|
[{'version': 'v1', 'created': 'Fri, 26 Sep 2014 09:23:37 GMT'}]
|
2015-06-23
|
[array(['Augustins', 'G.', ''], dtype=object)
array(['Etienne', 'L.', ''], dtype=object)
array(['Ferdy', 'J-B.', ''], dtype=object)
array(['Ferrer', 'R.', ''], dtype=object)
array(['Godelle', 'B.', ''], dtype=object)
array(['Pitard', 'E.', ''], dtype=object)
array(['Rousset', 'F.', ''], dtype=object)]
|
4,098 |
2003.12818
|
Giacomo Livan
|
Riccardo Marcaccioli, Giacomo Livan
|
Correspondence between temporal correlations in time series, inverse
problems, and the Spherical Model
|
9 pages, 2 figures
|
Phys. Rev. E 102, 012112 (2020)
|
10.1103/PhysRevE.102.012112
| null |
cond-mat.stat-mech physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we employ methods from Statistical Mechanics to model temporal
correlations in time series. We put forward a methodology based on the Maximum
Entropy principle to generate ensembles of time series constrained to preserve
part of the temporal structure of an empirical time series of interest. We show
that a constraint on the lag-one autocorrelation can be fully handled
analytically, and corresponds to the well known Spherical Model of a
ferromagnet. We then extend such a model to include constraints on more complex
temporal correlations by means of perturbation theory, showing that this leads
to substantial improvements in capturing the lag-one autocorrelation in the
variance. We apply our approach on synthetic data, and illustrate how it can be
used to formulate expectations on the future values of a data generating
process.
|
[{'version': 'v1', 'created': 'Sat, 28 Mar 2020 15:40:27 GMT'}
{'version': 'v2', 'created': 'Mon, 6 Jul 2020 15:37:45 GMT'}]
|
2020-07-15
|
[array(['Marcaccioli', 'Riccardo', ''], dtype=object)
array(['Livan', 'Giacomo', ''], dtype=object)]
|
4,099 |
astro-ph/9411025
|
Andrea Biviano
|
A. Biviano, F. Durret, D. Gerbal, O. Le F\`evre, C. Lobo, A. Mazure,
E. Slezak
|
On the galaxy luminosity function in the central regions of the Coma
cluster
|
7 pages, uuencoded postscript file (figures included) Accepted for
publication on A&A
| null | null | null |
astro-ph
| null |
We have obtained new redshifts for 265 objects in the central
48~$\times$~25~arcmin$^2$ region of the Coma cluster. When supplemented with
literature data, our redshift sample is 95~\% complete up to a magnitude
b$_{26.5}$=18.0 (the magnitudes are taken from the photometric sample of Godwin
et al. 1983). Using redshift-confirmed membership for 205 galaxies, and the
location in the colour-magnitude diagram for another 91 galaxies, we have built
a sample of cluster members which is complete up to b$_{26.5}$=20.0. We show
that the Coma cluster luminosity function cannot be adequately fitted by a
single Schechter (1976) function, because of a dip in the magnitude
distribution at b$_{26.5}$$\sim$17. The superposition of an Erlang (or a Gauss)
and a Schechter function provides a significantly better fit. We compare the
luminosity function of Coma to those of other clusters, and of the field.
Luminosity functions for rich clusters look similar, with a maximum at $M_{b}
\simeq -19.5 + 5 \times \log h_{50}$, while the Virgo and the field luminosity
functions show a nearly monotonic behaviour. These differences may be produced
by physical processes related to the environment which affect the luminosities
of a certain class of cluster galaxies.
|
[{'version': 'v1', 'created': 'Mon, 7 Nov 1994 14:02:22 GMT'}]
|
2007-05-23
|
[array(['Biviano', 'A.', ''], dtype=object)
array(['Durret', 'F.', ''], dtype=object)
array(['Gerbal', 'D.', ''], dtype=object)
array(['Fèvre', 'O. Le', ''], dtype=object)
array(['Lobo', 'C.', ''], dtype=object)
array(['Mazure', 'A.', ''], dtype=object)
array(['Slezak', 'E.', ''], dtype=object)]
|
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