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44.4k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
5,800 |
1804.01643
|
Roland Bouffanais
|
Eduard G. Fedorov, Alexander V. Zhukov, Roland Bouffanais, Alexander
P. Timashkov, Boris A. Malomed, Herv\'e Leblond, Dumitru Mihalache, Nikolay
N. Rosanov, Mikhail B. Belonenko
|
Propagation of three-dimensional bipolar ultrashort electromagnetic
pulses in an inhomogeneous array of carbon nanotubes
|
Phys. Rev. A, In Press
|
Phys. Rev. A 97 (2018) 043814
|
10.1103/PhysRevA.97.043814
| null |
physics.optics nlin.PS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the propagation of three-dimensional (3D) bipolar ultrashort
electromagnetic pulses in an inhomogeneous array of semiconductor carbon
nanotubes. The heterogeneity is represented by a planar region with an
increased concentration of conduction electrons. The evolution of the
electromagnetic field and electron concentration in the sample are governed by
the Maxwell's equations and continuity equation. In particular, non-uniformity
of the electromagnetic field along the axis of the nanotubes is taken into
account. We demonstrate that, depending on values of parameters of the
electromagnetic pulse approaching the region with the higher electron
concentration, the pulse is reflected from the region or passes it.
Specifically, our simulations demonstrate that, after interacting with the
higher-concentration area, the pulse can propagate steadily, without
significant spreading. The possibility of such ultrashort electromagnetic
pulses propagating in arrays of carbon nanotubes over distances significantly
exceeding characteristic dimensions of the pulses makes it possible to consider
them as 3D solitons.
|
[{'version': 'v1', 'created': 'Thu, 5 Apr 2018 01:23:08 GMT'}]
|
2022-09-29
|
[array(['Fedorov', 'Eduard G.', ''], dtype=object)
array(['Zhukov', 'Alexander V.', ''], dtype=object)
array(['Bouffanais', 'Roland', ''], dtype=object)
array(['Timashkov', 'Alexander P.', ''], dtype=object)
array(['Malomed', 'Boris A.', ''], dtype=object)
array(['Leblond', 'Hervé', ''], dtype=object)
array(['Mihalache', 'Dumitru', ''], dtype=object)
array(['Rosanov', 'Nikolay N.', ''], dtype=object)
array(['Belonenko', 'Mikhail B.', ''], dtype=object)]
|
5,801 |
2010.12571
|
Keith Burghardt
|
Keith Burghardt, Tad Hogg, Raissa M. D'Souza, Kristina Lerman, Marton
Posfai
|
Origins of Algorithmic Instabilities in Crowdsourced Ranking
|
12 pages, 20 figures
|
Proc. ACM Hum.-Comput. Interact., Vol. 4, No. CSCW2, Article 166.
2020
|
10.1145/3415237
| null |
cs.SI cs.HC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Crowdsourcing systems aggregate decisions of many people to help users
quickly identify high-quality options, such as the best answers to questions or
interesting news stories. A long-standing issue in crowdsourcing is how option
quality and human judgement heuristics interact to affect collective outcomes,
such as the perceived popularity of options. We address this limitation by
conducting a controlled experiment where subjects choose between two ranked
options whose quality can be independently varied. We use this data to
construct a model that quantifies how judgement heuristics and option quality
combine when deciding between two options. The model reveals popularity-ranking
can be unstable: unless the quality difference between the two options is
sufficiently high, the higher quality option is not guaranteed to be eventually
ranked on top. To rectify this instability, we create an algorithm that
accounts for judgement heuristics to infer the best option and rank it first.
This algorithm is guaranteed to be optimal if data matches the model. When the
data does not match the model, however, simulations show that in practice this
algorithm performs better or at least as well as popularity-based and
recency-based ranking for any two-choice question. Our work suggests that
algorithms relying on inference of mathematical models of user behavior can
substantially improve outcomes in crowdsourcing systems.
|
[{'version': 'v1', 'created': 'Fri, 23 Oct 2020 17:55:08 GMT'}]
|
2020-10-28
|
[array(['Burghardt', 'Keith', ''], dtype=object)
array(['Hogg', 'Tad', ''], dtype=object)
array(["D'Souza", 'Raissa M.', ''], dtype=object)
array(['Lerman', 'Kristina', ''], dtype=object)
array(['Posfai', 'Marton', ''], dtype=object)]
|
5,802 |
1110.4998
|
A. Mainzer
|
A. Mainzer, J. Masiero, T. Grav, J. Bauer, D. J. Tholen, R. S.
McMillan, E. Wright, T. Spahr, R. M. Cutri, R. Walker, W. Mo, J. Watkins, E.
Hand, C. Maleszewski
|
NEOWISE Studies of Asteroids with Sloan Photometry: Preliminary Results
|
ApJ accepted
| null |
10.1088/0004-637X/745/1/7
| null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have combined the NEOWISE and Sloan Digital Sky Survey data to study the
albedos of 24,353 asteroids with candidate taxonomic classifications derived
using Sloan photometry. We find a wide range of moderate to high albedos for
candidate S-type asteroids that are analogous to the S-complex defined by
previous spectrophotometrically-based taxonomic systems. The candidate C-type
asteroids, while generally very dark, have a tail of higher albedos that
overlaps the S types. The albedo distribution for asteroids with a
photometrically derived Q classification is extremely similar to those of the S
types. Asteroids with similar colors to (4) Vesta have higher albedos than the
S types, and most have orbital elements similar to known Vesta family members.
Finally, we show that the relative reflectance at 3.4 and 4.6 $\mu$m is higher
for D-type asteroids and suggest that their red visible and near-infrared
spectral slope extends out to these wavelengths. Understanding the relationship
between size, albedo, and taxonomic classification is complicated by the fact
that the objects with classifications were selected from the
visible/near-infrared Sloan Moving Object Catalog, which is biased against
fainter asteroids, including those with lower albedos.
|
[{'version': 'v1', 'created': 'Sat, 22 Oct 2011 20:40:42 GMT'}]
|
2015-05-30
|
[array(['Mainzer', 'A.', ''], dtype=object)
array(['Masiero', 'J.', ''], dtype=object)
array(['Grav', 'T.', ''], dtype=object)
array(['Bauer', 'J.', ''], dtype=object)
array(['Tholen', 'D. J.', ''], dtype=object)
array(['McMillan', 'R. S.', ''], dtype=object)
array(['Wright', 'E.', ''], dtype=object)
array(['Spahr', 'T.', ''], dtype=object)
array(['Cutri', 'R. M.', ''], dtype=object)
array(['Walker', 'R.', ''], dtype=object)
array(['Mo', 'W.', ''], dtype=object)
array(['Watkins', 'J.', ''], dtype=object)
array(['Hand', 'E.', ''], dtype=object)
array(['Maleszewski', 'C.', ''], dtype=object)]
|
5,803 |
1410.8836
|
Gregory Kelsey
|
Keith Jones and Gregory A. Kelsey
|
The horofunction boundary of the lamplighter group $L_2$ with the
Diestel-Leader metric
|
18 pages, 4 figures
| null | null | null |
math.GR math.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We fully describe the horofunction boundary $\partial_h L_2$ with the word
metric associated with the generating set $\{t,at\}$ (i.e the metric arising in
the Diestel-Leader graph $\text{DL}(2,2)$). The visual boundary
$\partial_\infty L_2$ with this metric is a subset of $\partial_h L_2$.
Although $\partial_\infty L_2$ does not embed continuously in $\partial_h L_2$,
it naturally splits into two subspaces, each of which is a punctured Cantor set
and does embed continuously. The height function on $\text{DL}(2,2)$ provides a
natural stratification of $\partial_h L_2$, in which countably-many
non-Busemann points interpolate between the two halves of $\partial_\infty
L_2$. Furthermore, the height function and its negation are themselves
non-Busemann horofunctions in $\partial_h L_2$ and are global fixed points of
the action of $L_2$.
|
[{'version': 'v1', 'created': 'Fri, 31 Oct 2014 18:23:04 GMT'}
{'version': 'v2', 'created': 'Tue, 19 Jan 2016 20:22:47 GMT'}]
|
2016-01-20
|
[array(['Jones', 'Keith', ''], dtype=object)
array(['Kelsey', 'Gregory A.', ''], dtype=object)]
|
5,804 |
1511.06552
|
Andrew Groszek
|
Andrew J. Groszek, Tapio P. Simula, David M. Paganin and Kristian
Helmerson
|
Onsager vortex formation in Bose-Einstein condensates in two-dimensional
power-law traps
|
10 pages, 10 figures. Version 2 is identical in content to the
published version
|
Phys. Rev. A 93, 043614 (2016)
|
10.1103/PhysRevA.93.043614
| null |
cond-mat.quant-gas
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study computationally dynamics of quantised vortices in two-dimensional
superfluid Bose-Einstein condensates confined in highly oblate power-law traps.
We have found that the formation of large scale Onsager vortex clusters
prevalent in steep-walled traps is suppressed in condensates confined by
harmonic potentials. However, the shape of the trapping potential does not
appear to adversely affect the evaporative heating efficiency of the vortex
gas. Instead, the suppression of Onsager vortex formation in harmonic traps can
be understood in terms of the energy of the vortex configurations. Furthermore,
we find that the vortex-antivortex pair annihilation that underpins the vortex
evaporative heating mechanism requires the interaction of at least three
vortices. We conclude that experimental observation of Onsager vortices should
be the most apparent in flat or inverted-bottom traps.
|
[{'version': 'v1', 'created': 'Fri, 20 Nov 2015 10:38:10 GMT'}
{'version': 'v2', 'created': 'Mon, 18 Apr 2016 07:38:47 GMT'}]
|
2016-04-19
|
[array(['Groszek', 'Andrew J.', ''], dtype=object)
array(['Simula', 'Tapio P.', ''], dtype=object)
array(['Paganin', 'David M.', ''], dtype=object)
array(['Helmerson', 'Kristian', ''], dtype=object)]
|
5,805 |
1211.5317
|
Pablo G. Camara
|
Mikel Berasaluce-Gonz\'alez, Pablo G. C\'amara, Fernando Marchesano,
\'Angel M. Uranga
|
Zp charged branes in flux compactifications
|
30 pages + appendices, 5 figures; v2: Small comments added in
sections 2.1 and 4. Version published in JHEP
| null |
10.1007/JHEP04(2013)138
|
IFT-UAM/CSIC-12-108
|
hep-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider 4d string compactifications in the presence of fluxes, and
classify particles, strings and domain walls arising from wrapped branes which
have charges conserved modulo an integer p, and whose annihilation is catalized
by fluxes, through the Freed-Witten anomaly or its dual versions. The
Z_p-valued strings and particles are associated to Z_p discrete gauge
symmetries, which we show are realized as discrete subgroups of 4d U(1)
symmetries broken by their Chern-Simons couplings to the background fluxes. We
also describe examples where the discrete gauge symmetry group is actually
non-Abelian. The Z_p-valued domain walls separate vacua which have different
flux quanta, yet are actually equivalent by an integer shift of axion fields
(or further string duality symmetries). We argue that certain examples are
related by T-duality to the realization of discrete gauge symmetries and Z_p
charges from torsion (co)homology. At a formal level, the groups classifying
these discrete charges should correspond to a generalization of K-theory in the
presence of general fluxes (and including fundamental strings and NS5-branes).
|
[{'version': 'v1', 'created': 'Thu, 22 Nov 2012 15:54:05 GMT'}
{'version': 'v2', 'created': 'Wed, 24 Apr 2013 10:47:28 GMT'}]
|
2015-06-12
|
[array(['Berasaluce-González', 'Mikel', ''], dtype=object)
array(['Cámara', 'Pablo G.', ''], dtype=object)
array(['Marchesano', 'Fernando', ''], dtype=object)
array(['Uranga', 'Ángel M.', ''], dtype=object)]
|
5,806 |
1803.06980
|
Muhammad Mohebujjaman
|
Muhammad Mohebujjaman
|
Second order ensemble simulation for MHD flow in Els\"asser variable
with noisy input data
| null | null | null | null |
math.NA
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We propose, analyze and test a fully discrete, efficient second-order
algorithm for computing flow ensembles average of viscous, incompressible, and
time-dependent magnetohydrodynamic (MHD) flows under uncertainties in initial
conditions. The scheme is decoupled and based on Els\"asser variable
formulation. The algorithm uses the breakthrough idea of Jiang and Layton, 2014
to approximate the ensemble average of $J$ realizations. That is, at each time
step, each of the $J$ realization shares the same coefficient matrix for
different right-hand side matrices. Thus, storage requirements and
computational time are reduced by building preconditioners once per time step
and reuse them. We prove stability and optimal convergence with respect to the
time step restriction. On some manufactured solutions, numerical experiments
are given to verify the predicted convergence rates of our analysis. Finally,
we test the scheme on a benchmark channel flow over a step and it performs
well.
|
[{'version': 'v1', 'created': 'Mon, 19 Mar 2018 15:11:51 GMT'}]
|
2018-03-20
|
[array(['Mohebujjaman', 'Muhammad', ''], dtype=object)]
|
5,807 |
2305.05069
|
Fernando Guevara Vasquez
|
Trent DeGiovanni, Fernando Guevara Vasquez and China Mauck
|
Imaging with thermal noise induced currents
|
22 pages, 6 figures
| null | null | null |
math.NA cs.NA
|
http://creativecommons.org/licenses/by/4.0/
|
We use thermal noise induced currents to image the real and imaginary parts
of the conductivity of a body. Covariances of the thermal noise currents
measured at a few electrodes are shown to be related to a deterministic
problem. We use the covariances obtained while selectively heating the body to
recover the real power density in the body under known boundary conditions and
at a known frequency. The resulting inverse problem is related to
acousto-electric tomography, but where the conductivity is complex and only the
real power is measured. We study the local solvability of this problem by
determining where its linearization is elliptic. Numerical experiments
illustrating this inverse problem are included.
|
[{'version': 'v1', 'created': 'Mon, 8 May 2023 22:11:01 GMT'}]
|
2023-05-10
|
[array(['DeGiovanni', 'Trent', ''], dtype=object)
array(['Vasquez', 'Fernando Guevara', ''], dtype=object)
array(['Mauck', 'China', ''], dtype=object)]
|
5,808 |
2002.09883
|
Fran\c{c}ois Zara Mr
|
Fran\c{c}ois Zara
|
Repr\'esentations de r\'eflexion de groupes de Coxeter -- Quatri\`eme
partie: La repr\'esentation $R$ est r\'eductible. G\'en\'eralit\'es
|
20 pages, in French
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this fourth part, (with the notations of the preceding parts) we make the
following hypothesis: $(W,S)$ is a Coxeter system, irreducible, $2$-spherical
and $S$ is finite. Let $R:W\to GL(M)$ be a reducible reflection representation
of $W$. Let $G:= Im\,R$. Each sub-space of $M$ $(\neq M)$ stabilize by $G$ is
contained in $C_{M}(G)$. Let $M':=M/C_{M}(G)$ and $N(G):=\{g|g\in G,g\,
\text{acts trivially on}\,M'$. We call $N(G)$ the translation sub-group of $G$.
One of the goals of this part is to study $M'$ and $N(G)$.
|
[{'version': 'v1', 'created': 'Sun, 23 Feb 2020 10:43:57 GMT'}]
|
2020-02-25
|
[array(['Zara', 'François', ''], dtype=object)]
|
5,809 |
0712.3081
|
Miguel Rodriguez-Olmos
|
Miguel Rodriguez-Olmos, M. Esmeralda Sousa-Dias
|
Nonlinear Stability of Riemann Ellipsoids with Symmetric Configurations
| null |
J. Nonlinear Sci. 19 (2009) 179-219
|
10.1007/s00332-008-9032-z
| null |
math-ph math.MP
| null |
We apply geometric techniques to obtain the necessary and sufficient
conditions on the existence and nonlinear stability of self-gravitating Riemann
ellipsoids having at least two equal axes.
|
[{'version': 'v1', 'created': 'Wed, 19 Dec 2007 00:15:11 GMT'}]
|
2015-05-13
|
[array(['Rodriguez-Olmos', 'Miguel', ''], dtype=object)
array(['Sousa-Dias', 'M. Esmeralda', ''], dtype=object)]
|
5,810 |
0802.1572
|
Dong-Won Jung
|
Dong-Won Jung, Kang Young Lee
|
Production of the charged Higgs bosons at the CERN Large Hadron Collider
in the left-right symmetric model
|
The version which will appear in PRD. References are added
|
Phys.Rev.D78:015022,2008
|
10.1103/PhysRevD.78.015022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the production of the charged Higgs boson at the LHC in the
left-right symmetric model. It is shown that there exists a lower bound of the
cross section. We investigate that predicted cross sections of this model are
generally larger than those of the two Higgs doublet model or the minimal
supersymmetric model.
|
[{'version': 'v1', 'created': 'Tue, 12 Feb 2008 06:39:51 GMT'}
{'version': 'v2', 'created': 'Tue, 13 May 2008 09:31:40 GMT'}
{'version': 'v3', 'created': 'Mon, 30 Jun 2008 07:50:08 GMT'}]
|
2008-11-26
|
[array(['Jung', 'Dong-Won', ''], dtype=object)
array(['Lee', 'Kang Young', ''], dtype=object)]
|
5,811 |
2008.00647
|
Jinlu Li
|
Jinlu Li, Xing Wu, Weipeng Zhu, Jiayu Guo
|
Non-uniform continuity of the generalized Camassa-Holm equation in Besov
spaces
| null | null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the Cauchy problem for the generalized
Camassa-Holm equation proposed by Hakkaev and Kirchev (2005) \cite{Hakkaev
2005}. We prove that the solution map of the generalized Camassa-Holm equation
is not uniformly continuous on the initial data in Besov spaces. Our result
include the present work (2020) \cite{Li 2020,Li 2020-1} on Camassa-Holm
equation with $Q=1$ and extends the previous non-uniform continuity in Sobolev
spaces (2015) \cite{Mi 2015} to Besov spaces. In addition, the non-uniform
continuity in critical space $B_{2, 1}^{\frac{3}{2}}(\mathbb{R})$ is the first
to be considered in our paper.
|
[{'version': 'v1', 'created': 'Mon, 3 Aug 2020 05:04:47 GMT'}]
|
2020-08-04
|
[array(['Li', 'Jinlu', ''], dtype=object)
array(['Wu', 'Xing', ''], dtype=object)
array(['Zhu', 'Weipeng', ''], dtype=object)
array(['Guo', 'Jiayu', ''], dtype=object)]
|
5,812 |
2301.03847
|
Priyanka deSouza
|
Priyanka deSouza, An Wang, Yuki Machida, Tiffany Duhl, Simone Mora,
Prashant Kumar, Ralph Kahn, Carlo Ratti, John L. Durant, Neelakshi Hudda
|
Evaluating the Performance of Low-Cost PM2.5 Sensors in Mobile Settings
|
43 pages
| null | null | null |
stat.AP
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Low-cost sensors (LCS) for measuring air pollution are increasingly being
deployed in mobile applications but questions concerning the quality of the
measurements remain unanswered. For example, what is the best way to correct
LCS data in a mobile setting? Which factors most significantly contribute to
differences between mobile LCS data and higher-quality instruments? Can data
from LCS be used to identify hotspots and generate generalizable pollutant
concentration maps? To help address these questions we deployed low-cost PM2.5
sensors (Alphasense OPC-N3) and a research-grade instrument (TSI DustTrak) in a
mobile laboratory in Boston, MA, USA. We first collocated these instruments
with stationary PM2.5 reference monitors at nearby regulatory sites. Next,
using the reference measurements, we developed different models to correct the
OPC-N3 and DustTrak measurements, and then transferred the corrections to the
mobile setting. We observed that more complex correction models appeared to
perform better than simpler models in the stationary setting; however, when
transferred to the mobile setting, corrected OPC-N3 measurements agreed less
well with corrected DustTrak data. In general, corrections developed using
minute-level collocation measurements transferred better to the mobile setting
than corrections developed using hourly-averaged data. Mobile laboratory speed,
OPC-N3 orientation relative to the direction of travel, date, hour-of-the-day,
and road class together explain a small but significant amount of variation
between corrected OPC-N3 and DustTrak measurements during the mobile
deployment. Persistent hotspots identified by the OPC-N3s agreed with those
identified by the DustTrak. Similarly, maps of PM2.5 distribution produced from
the mobile corrected OPC-N3 and DustTrak measurements agreed well.
|
[{'version': 'v1', 'created': 'Tue, 10 Jan 2023 08:33:16 GMT'}]
|
2023-01-11
|
[array(['deSouza', 'Priyanka', ''], dtype=object)
array(['Wang', 'An', ''], dtype=object)
array(['Machida', 'Yuki', ''], dtype=object)
array(['Duhl', 'Tiffany', ''], dtype=object)
array(['Mora', 'Simone', ''], dtype=object)
array(['Kumar', 'Prashant', ''], dtype=object)
array(['Kahn', 'Ralph', ''], dtype=object)
array(['Ratti', 'Carlo', ''], dtype=object)
array(['Durant', 'John L.', ''], dtype=object)
array(['Hudda', 'Neelakshi', ''], dtype=object)]
|
5,813 |
hep-th/9402113
|
Igor Klebanov
|
Curtis G. Callan, Igor R. Klebanov, Andreas W. W. Ludwig, Juan M.
Maldacena
|
Exact Solution of a Boundary Conformal Field Theory
|
harvmac and epsf, 36 pages with 5 figures; v2: the version which
appeared in NPB including a Note Added on the band structure of open strings
|
Nucl.Phys. B422 (1994) 417-448
|
10.1016/0550-3213(94)90440-5
|
PUPT-1450, IASSNS-HEP-94/15
|
hep-th cond-mat
| null |
We study the conformal field theory of a free massless scalar field living on
the half line with interactions introduced via a periodic potential at the
boundary. An SU(2) current algebra underlies this system and the interacting
boundary state is given by a global SU(2) rotation of the left-moving fields in
the zero-potential (Neumann) boundary state. As the potential strength varies
from zero to infinity, the boundary state interpolates between the Neumann and
the Dirichlet values. The full S-matrix for scattering from the boundary, with
arbitrary particle production, is explicitly computed. To maintain unitarity,
it is necessary to attribute a hidden discrete ``soliton'' degree of freedom to
the boundary. The same unitarity puzzle occurs in the Kondo problem, and we
anticipate a similar solution.
|
[{'version': 'v1', 'created': 'Fri, 18 Feb 1994 19:20:14 GMT'}
{'version': 'v2', 'created': 'Sun, 25 May 2003 20:03:10 GMT'}]
|
2009-10-28
|
[array(['Callan', 'Curtis G.', ''], dtype=object)
array(['Klebanov', 'Igor R.', ''], dtype=object)
array(['Ludwig', 'Andreas W. W.', ''], dtype=object)
array(['Maldacena', 'Juan M.', ''], dtype=object)]
|
5,814 |
0806.3872
|
Nicolas Mordant
|
Michael Berhanu, Basile Gallet, Nicolas Mordant, Stephan Fauve
|
Reduction of velocity fluctuations in a turbulent flow of gallium by an
external magnetic field
|
accepted for Physical Review E
| null |
10.1103/PhysRevE.78.015302
| null |
physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The magnetic field of planets or stars is generated by the motion of a
conducting fluid through a dynamo instability. The saturation of the magnetic
field occurs through the reaction of the Lorentz force on the flow. In relation
to this phenomenon, we study the effect of a magnetic field on a turbulent flow
of liquid Gallium. The measurement of electric potential differences provides a
signal related to the local velocity fluctuations. We observe a reduction of
velocity fluctuations at all frequencies in the spectrum when the magnetic
field is increased.
|
[{'version': 'v1', 'created': 'Tue, 24 Jun 2008 16:22:38 GMT'}]
|
2009-11-13
|
[array(['Berhanu', 'Michael', ''], dtype=object)
array(['Gallet', 'Basile', ''], dtype=object)
array(['Mordant', 'Nicolas', ''], dtype=object)
array(['Fauve', 'Stephan', ''], dtype=object)]
|
5,815 |
1105.5943
|
Ketan Patel
|
Anjan S. Joshipura, Ketan M. Patel
|
Viability of the exact tri-bimaximal mixing at M_{GUT} in SO(10)
|
Numerical analysis updated in view of the T2K and MINOS results.
Published version
|
JHEP09(2011)137; JHEP 1109:137,2011
|
10.1007/JHEP09(2011)137
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
General structures of the charged lepton and the neutrino mixing matrices
leading to tri-bimaximal leptonic mixing are determined. These are then
integrated into an SO(10) model within which detailed fits to fermion masses
and mixing angles are given. It is shown that one can obtain excellent fits to
all the fermion masses and quark mixing angles keeping tri-bimaximal leptonic
mixing intact. Different perturbations to the basic structure are considered
and those which can or which cannot account for the recent T2K and MINOS
results on the reactor mixing angle $\theta_{13}^l$ are identified.
|
[{'version': 'v1', 'created': 'Mon, 30 May 2011 11:07:12 GMT'}
{'version': 'v2', 'created': 'Fri, 7 Oct 2011 06:32:48 GMT'}]
|
2011-10-10
|
[array(['Joshipura', 'Anjan S.', ''], dtype=object)
array(['Patel', 'Ketan M.', ''], dtype=object)]
|
5,816 |
1402.3406
|
Yi Man
|
Yi Man and Eric Lauga
|
The wobbling-to-swimming transition of rotated helices
| null |
Y. Man and E. Lauga, Phys. Fluids, 25, 071904, 2013
|
10.1063/1.4812637
| null |
physics.flu-dyn cond-mat.soft physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A growing body of work aims at designing and testing micron-scale synthetic
swimmers. One method, inspired by the locomotion of flagellated bacteria,
consists of applying a rotating magnetic field to a rigid, helically-shaped,
propeller attached to a magnetic head. When the resulting device, termed an
artificial bacteria flagellum, is aligned perpendicularly to the applied field,
the helix rotates and the swimmer moves forward. Experimental investigation of
artificial bacteria flagella shows that at low frequency of the applied field,
the axis of the helix does not align perpendicularly to the field but wobbles
around the helix, with an angle increasing as the inverse of the field
frequency. By numerical computations and asymptotic analysis, we provide a
theoretical explanation for this wobbling behavior. We numerically demonstrate
the wobbling-to-swimming transition as a function of the helix geometry and the
dimensionless Mason number which quantifies the ratio of viscous to magnetic
torques. We then employ an asymptotic expansion for near-straight helices to
derive an analytical estimate for the wobbling angle allowing to rationalize
our computations and past experimental results. These results can help guide
future design of artificial helical swimmers.
|
[{'version': 'v1', 'created': 'Fri, 14 Feb 2014 09:32:37 GMT'}]
|
2014-02-17
|
[array(['Man', 'Yi', ''], dtype=object)
array(['Lauga', 'Eric', ''], dtype=object)]
|
5,817 |
2106.11708
|
Tasneem Saleem
|
T. Saleem, F.J. Iguaz, F. Orsini
|
Allpix-Squared Simulations of Multi-element Germanium Detectors for
Synchrotron Applications
|
Preprint JINST
| null |
10.1088/1748-0221/17/02/P02013
| null |
physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
X-rays spectroscopy experiments at synchrotron facilities were limited for
many years by the maximum input-count rate and the signal-to-background ratio
of germanium fluorescence detectors. These limitations are related to the
germanium semiconductor device, the sensor configuration and its response to
the incident X-ray flux at different energies. In order to understand and
quantify such limitations, physics simulation of the detector response is a
powerful tool to provide guidelines for designing, prototyping and improving
detectors, as well as modelling experimental environments, which reduces time
and cost of development. For this purpose, a first complete and operational
simulation chain based on Allpix Squared framework is presented, customized to
multi-element germanium detectors and combined with three-dimensional
simulations of the electric field and the weighting potential, based on COMSOL
Multiphysics. Based on this simulation chain, a quantification of charge
sharing effect as well as signal-to-background ratio at different beam energies
has been made for a germanium detector equipped with and without collimator. In
addition, two experimental measurements have been performed on the SAMBA
beamline at SOLEIL synchrotron. The experimental data were used to set up the
full simulation chain and good agreements have been observed between data and
simulation.
|
[{'version': 'v1', 'created': 'Tue, 22 Jun 2021 12:27:38 GMT'}
{'version': 'v2', 'created': 'Thu, 26 Aug 2021 06:37:01 GMT'}
{'version': 'v3', 'created': 'Mon, 29 Nov 2021 14:40:27 GMT'}
{'version': 'v4', 'created': 'Mon, 17 Jan 2022 10:04:28 GMT'}]
|
2022-02-23
|
[array(['Saleem', 'T.', ''], dtype=object)
array(['Iguaz', 'F. J.', ''], dtype=object)
array(['Orsini', 'F.', ''], dtype=object)]
|
5,818 |
2306.15013
|
James Cresser
|
Stephen M. Barnett, James D. Cresser and Sarah Croke
|
Revisiting the damped quantum harmonic oscillator
|
38 pages, 6 figures. This article, part review and part new results,
is a contribution to the special issue of Physica Scripta "Challenges in
quantum dynamics'', in honour of Professor Igor Jex on the occasion of his
60th birthday. arXiv admin note: substantial text overlap with
arXiv:1508.02442
| null | null | null |
quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We reanalyse the quantum damped harmonic oscillator, introducing three less
than common features. These are (i) the use of a continuum model of the
reservoir rather than an ensemble of discrete oscillators, (ii) an exact
diagonalisation of the Hamiltonian by adapting a technique pioneered by Fano,
and (iii) the use of the thermofield technique for describing a finite
temperature reservoir. We recover in this way a number of well-known and some,
perhaps, less familiar results. An example of the latter is an ab initio proof
that the oscillator relaxes to the mean-force Gibbs state. We find that special
care is necessary when comparing the damped oscillator with its undamped
counterpart as the former has two distinct natural frequencies, one associated
with short time evolution and the other with longer times.
|
[{'version': 'v1', 'created': 'Mon, 26 Jun 2023 18:52:50 GMT'}]
|
2023-06-28
|
[array(['Barnett', 'Stephen M.', ''], dtype=object)
array(['Cresser', 'James D.', ''], dtype=object)
array(['Croke', 'Sarah', ''], dtype=object)]
|
5,819 |
2106.01250
|
Dmitrii Kosarev
|
Dmitrii Kosarev and Dmitry Boulytchev
|
Generic Programming with Combinators and Objects
| null | null | null | null |
cs.PL
|
http://creativecommons.org/licenses/by/4.0/
|
We present a generic programming framework for OCAML which makes it possible
to implement extensible transformations for a large scale of type definitions.
Our framework makes use of objectoriented features of OCAML, utilising late
binding to override the default behaviour of generated transformations. The
support for polymorphic variant types complements the ability to describe
composable data types with the ability to implement composable transformations.
|
[{'version': 'v1', 'created': 'Wed, 2 Jun 2021 16:01:33 GMT'}]
|
2021-06-03
|
[array(['Kosarev', 'Dmitrii', ''], dtype=object)
array(['Boulytchev', 'Dmitry', ''], dtype=object)]
|
5,820 |
2103.02236
|
Yu Song
|
Hong Huang, Yu Song, Yao Wu, Jia Shi, Xia Xie and Hai Jin
|
Multi-Task Representation Learning with Multi-View Graph Convolutional
Networks
|
IEEE Transactions on Neural Networks and Learning Systems 2020
| null |
10.1109/TNNLS.2020.3036825
| null |
cs.SI
|
http://creativecommons.org/licenses/by/4.0/
|
Link prediction and node classification are two important downstream tasks of
network representation learning. Existing methods have achieved acceptable
results but they perform these two tasks separately, which requires a lot of
duplication of work and ignores the correlations between tasks. Besides,
conventional models suffer from the identical treatment of information of
multiple views, thus they fail to learn robust representation for downstream
tasks. To this end, we tackle link prediction and node classification problems
simultaneously via multi-task multi-view learning in this paper. We first
explain the feasibility and advantages of multi-task multi-view learning for
these two tasks. Then we propose a novel model named as MT-MVGCN to perform
link prediction and node classification tasks simultaneously. More
specifically, we design a multi-view graph convolutional network to extract
abundant information of multiple views in a network, which is shared by
different tasks. We further apply two attention mechanisms: view attention
mechanism and task attention mechanism to make views and tasks adjust the view
fusion process. Moreover, view reconstruction can be introduced as an auxiliary
task to boost the performance of the proposed model. Experiments on real-world
network datasets demonstrate that our model is efficient yet effective, and
outperforms advanced baselines in these two tasks.
|
[{'version': 'v1', 'created': 'Wed, 3 Mar 2021 08:00:25 GMT'}]
|
2021-03-04
|
[array(['Huang', 'Hong', ''], dtype=object)
array(['Song', 'Yu', ''], dtype=object)
array(['Wu', 'Yao', ''], dtype=object)
array(['Shi', 'Jia', ''], dtype=object)
array(['Xie', 'Xia', ''], dtype=object)
array(['Jin', 'Hai', ''], dtype=object)]
|
5,821 |
2209.00241
|
Matthias Meiners
|
Volker Betz, Matthias Meiners, Ivana Tomic
|
Speed Function for Biased Random Walks with Traps
|
10 pages, 3 figures
| null | null | null |
math.PR math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a biased nearest-neighbor random walk on $\Z$ which at each step
is trapped for some random time with random, site-dependent mean. We derive a
simple formula for the speed function in terms of the model parameters.
|
[{'version': 'v1', 'created': 'Thu, 1 Sep 2022 06:06:34 GMT'}]
|
2022-09-02
|
[array(['Betz', 'Volker', ''], dtype=object)
array(['Meiners', 'Matthias', ''], dtype=object)
array(['Tomic', 'Ivana', ''], dtype=object)]
|
5,822 |
hep-th/0304005
|
Isao Kishimoto
|
I. Bars, I. Kishimoto, Y. Matsuo
|
Fermionic Ghosts in Moyal String Field Theory
|
65 pages, typos corrected
|
JHEP 0307 (2003) 027
|
10.1088/1126-6708/2003/07/027
|
USCHEP/0304ib2, UT-03-08
|
hep-th
| null |
We complete the construction of the Moyal star formulation of bosonic open
string field theory (MSFT) by providing a detailed study of the fermionic ghost
sector. In particular, as in the case of the matter sector, (1) we construct a
map from Witten's star product to the Moyal product, (2) we propose a
regularization scheme which is consistent with the matter sector and (3) as a
check of the formalism, we derive the ghost Neumann coefficients algebraically
directly from the Moyal product. The latter satisfy the Gross-Jevicki nonlinear
relations even in the presence of the regulator, and when the regulator is
removed they coincide numerically with the expression derived from conformal
field theory. After this basic construction, we derive a regularized action of
string field theory in the Siegel gauge and define the Feynman rules. We give
explicitly the analytic expression of the off-shell four point function for
tachyons, including the ghost contribution. Some of the results in this paper
have already been used in our previous publications. This paper provides the
technical details of the computations which were omitted there.
|
[{'version': 'v1', 'created': 'Tue, 1 Apr 2003 15:02:35 GMT'}
{'version': 'v2', 'created': 'Wed, 9 Apr 2003 17:20:03 GMT'}
{'version': 'v3', 'created': 'Sun, 20 Jul 2003 19:37:18 GMT'}]
|
2009-11-10
|
[array(['Bars', 'I.', ''], dtype=object)
array(['Kishimoto', 'I.', ''], dtype=object)
array(['Matsuo', 'Y.', ''], dtype=object)]
|
5,823 |
2305.18380
|
Chih-Hong Cheng
|
Utku Ayvaz, Chih-Hong Cheng, Hao Shen
|
Potential-based Credit Assignment for Cooperative RL-based Testing of
Autonomous Vehicles
|
Accepted at IJCNN'23
| null | null | null |
cs.LG cs.SE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
While autonomous vehicles (AVs) may perform remarkably well in generic
real-life cases, their irrational action in some unforeseen cases leads to
critical safety concerns. This paper introduces the concept of collaborative
reinforcement learning (RL) to generate challenging test cases for AV planning
and decision-making module. One of the critical challenges for collaborative RL
is the credit assignment problem, where a proper assignment of rewards to
multiple agents interacting in the traffic scenario, considering all parameters
and timing, turns out to be non-trivial. In order to address this challenge, we
propose a novel potential-based reward-shaping approach inspired by
counterfactual analysis for solving the credit-assignment problem. The
evaluation in a simulated environment demonstrates the superiority of our
proposed approach against other methods using local and global rewards.
|
[{'version': 'v1', 'created': 'Sun, 28 May 2023 06:41:06 GMT'}]
|
2023-05-31
|
[array(['Ayvaz', 'Utku', ''], dtype=object)
array(['Cheng', 'Chih-Hong', ''], dtype=object)
array(['Shen', 'Hao', ''], dtype=object)]
|
5,824 |
1905.00589
|
Ben Buchler
|
Jesse L. Everett, Daniel B. Higginbottom, Geoff T. Campbell, Ping Koy
Lam, Ben C. Buchler
|
Stationary light in atomic media
| null |
Advanced Quantum Technologies, 2019
|
10.1002/qute.201800100
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When ensembles of atoms interact with coherent light fields a great many
interesting and useful effects can be observed. In particular, the group
velocity of the coherent fields can be modified dramatically.
Electromagnetically induced transparency is perhaps the best known example,
giving rise to very slow light. Careful tuning of the optical fields can also
produce stored light where a light field is mapped completely into a coherence
of the atomic ensemble. In contrast to stored light, in which the optical field
is extinguished, stationary light is a bright field of light with a group
velocity of zero. Stationary light has applications in situations where it is
important to maintain an optical field, such as attempts to engineer large
nonlinear interactions. In this paper we review the stationary light
demonstrations published to date and provide a unified theoretical framework
that describes the experimental observations. We also discuss possible
applications of stationary light with a particular focus on all-optical phase
gates for quantum information technology.
|
[{'version': 'v1', 'created': 'Thu, 2 May 2019 06:51:16 GMT'}]
|
2019-05-03
|
[array(['Everett', 'Jesse L.', ''], dtype=object)
array(['Higginbottom', 'Daniel B.', ''], dtype=object)
array(['Campbell', 'Geoff T.', ''], dtype=object)
array(['Lam', 'Ping Koy', ''], dtype=object)
array(['Buchler', 'Ben C.', ''], dtype=object)]
|
5,825 |
1404.0269
|
Marcel Ausloos
|
Marcel Ausloos
|
Zipf-Mandelbrot-Pareto model for co-authorship popularity
|
30 pages, 39 refs., 15 figures; to be published in Scientometrics
| null |
10.1007/s11192-014-1302-y
| null |
physics.soc-ph nlin.AO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Each co-author (CA) of any scientist can be given a rank ($r$) of importance
according to the number ($J$) of joint publications which the authors have
together. In this paper, the Zipf-Mandelbrot-Pareto law, i.e. $ J \propto
1/(\nu+r)^{\zeta}$ is shown to reproduce the empirical relationship between $J$
and $r$ and shown to be preferable to a mere power law, $ J \propto
1/r^{\alpha} $. The CA core value, i.e. the core number of CAs, is unaffected,
of course. The demonstration is made on data for two authors, with a high
number of joint publications, recently considered by Bougrine (2014) and for 7
authors, distinguishing between their "journal" and "proceedings" publications
as suggested by Miskiewicz (2013).
The rank-size statistics is discussed and the $\alpha$ and $\zeta$ exponents
are compared. The correlation coefficient is much improved ($\sim$ 0.99,
instead of 0.92). There are marked deviations of such a co-authorship
popularity law depending on sub-fields. On one hand, this suggests an
interpretation of the parameter $\nu$. On the other hand, it suggests a novel
model on the (likely time dependent) structural and publishing properties of
research teams. Thus, one can propose a scenario for how a research team is
formed and grows. This is based on a hierarchy utility concept, justifying the
empirical Zipf-Mandelbrot-Pareto law, assuming a simple form for the CA
publication/cost ratio, $c_r = c_0\: log_2 (\nu+r)$. In conclusion, such a law
and model can suggest practical applications on measures of research teams.
In Appendices, the frequency-size cumulative distribution function is
discussed for two sub-fields, with other technicalities
|
[{'version': 'v1', 'created': 'Tue, 1 Apr 2014 15:16:12 GMT'}]
|
2014-05-20
|
[array(['Ausloos', 'Marcel', ''], dtype=object)]
|
5,826 |
1201.3477
|
Ather Mahmood
|
A. Mahmood, P. Mallet and J.-Y. Veuillen
|
Quasiparticle scattering off phase boundaries in epitaxial graphene
| null |
Nanotechnology 23 (2012) 055706
|
10.1088/0957-4484/23/5/055706
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the electronic structure of terraces of single layer graphene
(SLG) by scanning tunneling microscopy (STM) on samples grown by thermal
decomposition of 6H-SiC(0001) crystals in ultra-high vacuum. We focus on the
perturbations of the local density of states (LDOS) in the vicinity of edges of
SLG terraces. Armchair edges are found to favour intervalley quasiparticle
scattering, leading to the (\surd3\times\surd3)R30{\deg} LDOS superstructure
already reported for graphite edges and more recently for SLG on SiC(0001).
Using Fourier transform of LDOS images, we demonstrate that the intrinsic
doping of SLG is responsible for a LDOS pattern at the Fermi energy which is
more complex than for neutral graphene or graphite, since it combines local
(\surd3\times\surd3)R30{\deg} superstructure and long range beating modulation.
Although these features were already reported by Yang et al. Nanoletters 10,
943 (2010), we propose here an alternative interpretation based on simple
arguments classically used to describe standing wave patterns in standard
two-dimensional systems. Finally, we discuss the absence of intervalley
scattering off other typical boundaries: zig-zag edges and SLG/bilayer graphene
junctions.
|
[{'version': 'v1', 'created': 'Tue, 17 Jan 2012 10:43:39 GMT'}]
|
2012-01-18
|
[array(['Mahmood', 'A.', ''], dtype=object)
array(['Mallet', 'P.', ''], dtype=object)
array(['Veuillen', 'J. -Y.', ''], dtype=object)]
|
5,827 |
2304.08290
|
Mihai Sirbu
|
Dmitry Kramkov and Mihai S\^irbu
|
Backward martingale transport maps in pseudo-Euclidean spaces
|
22 pages, submitted
| null | null | null |
math.PR
|
http://creativecommons.org/licenses/by/4.0/
|
We consider an optimal transport problem with backward martingale constraint.
The objective function is given by the scalar product of a pseudo-Euclidean
space $S$. We show that the supremum over maps equals the supremum over plans
provided that the law $\nu$ of the input random variable $Y$ is atomless. An
optimal map $X$ exists if $\nu$ does not charge any $c-c$ surface (the graph of
a difference of convex functions) with strictly positive normal vectors in the
sense of the $S$-space. The optimal map $X$ is unique if, in addition, $\nu$
does not charge $c-c$ surfaces with positive and nearly isotropic normal
vectors in the $S$-space. In the latter case, the joint law of $(X,Y)$ is the
unique optimal backward martingale plan.
|
[{'version': 'v1', 'created': 'Mon, 17 Apr 2023 14:02:52 GMT'}]
|
2023-04-18
|
[array(['Kramkov', 'Dmitry', ''], dtype=object)
array(['Sîrbu', 'Mihai', ''], dtype=object)]
|
5,828 |
cond-mat/0503135
|
Michel Kenzelmann
|
M. Kenzelmann, C.D. Batista, Y. Chen, C. Broholm, D.H. Reich, S. Park
and Y. Qiu
|
The S=1/2 chain in a staggered field: High-energy bound-spinon state and
the effects of a discrete lattice
|
16 pages, 7 figures, accepted by Phys. Rev. B
|
Phys. Rev. B 71, 094411 (2005)
|
10.1103/PhysRevB.71.094411
| null |
cond-mat.str-el cond-mat.stat-mech
| null |
We report an experimental and theoretical study of the antiferromagnetic
S=1/2 chain subject to uniform and staggered fields. Using inelastic neutron
scattering, we observe a novel bound-spinon state at high energies in the
linear chain compound CuCl2 * 2((CD3)2SO). The excitation is explained with a
mean-field theory of interacting S=1/2 fermions and arises from the opening of
a gap at the Fermi surface due to confining spinon interactions. The mean-field
model also describes the wave-vector dependence of the bound-spinon states,
particularly in regions where effects of the discrete lattice are important. We
calculate the dynamic structure factor using exact diagonalization of finite
length chains, obtaining excellent agreement with the experiments.
|
[{'version': 'v1', 'created': 'Sun, 6 Mar 2005 16:51:18 GMT'}]
|
2009-11-11
|
[array(['Kenzelmann', 'M.', ''], dtype=object)
array(['Batista', 'C. D.', ''], dtype=object)
array(['Chen', 'Y.', ''], dtype=object)
array(['Broholm', 'C.', ''], dtype=object)
array(['Reich', 'D. H.', ''], dtype=object)
array(['Park', 'S.', ''], dtype=object)
array(['Qiu', 'Y.', ''], dtype=object)]
|
5,829 |
2006.09721
|
Jingqiang Ye
|
E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, L. Althueser, F. D.
Amaro, V. C. Antochi, E. Angelino, J. R. Angevaare, F. Arneodo, D. Barge, L.
Baudis, B. Bauermeister, L. Bellagamba, M. L. Benabderrahmane, T. Berger, A.
Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M. R.
Cardoso, D. Cichon, B. Cimmino, M. Clark, D. Coderre, A. P. Colijn, J.
Conrad, J. P. Cussonneau, M. P. Decowski, A. Depoian, P. Di Gangi, A. Di
Giovanni, R. Di Stefano, S. Diglio, A. Elykov, G. Eurin, A. D. Ferella, W.
Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, L. Grandi, C. Hasterok,
C. Hils, K. Hiraide, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, F.
Joerg, N. Kato, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman,
R. F. Lang, L. Levinson, Q. Lin, S. Lindemann, M. Lindner, F. Lombardi, J.
Long, J. A. M. Lopes, E. L\'opez Fune, C. Macolino, J. Mahlstedt, A. Mancuso,
L. Manenti, A. Manfredini, F. Marignetti, T. Marrod\'an Undagoitia, K.
Martens, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Miuchi, K.
Mizukoshi, A. Molinario, K. Mor{\aa}, S. Moriyama, Y. Mosbacher, M. Murra, J.
Naganoma, K. Ni, U. Oberlack, K. Odgers, J. Palacio, B. Pelssers, R. Peres,
J. Pienaar, V. Pizzella, G. Plante, J. Qin, H. Qiu, D. Ram\'irez Garc\'ia, S.
Reichard, A. Rocchetti, N. Rupp, J. M. F. dos Santos, G. Sartorelli, N.
\v{S}ar\v{c}evi\'c, M. Scheibelhut, J. Schreiner, D. Schulte, M. Schumann, L.
Scotto Lavina, M. Selvi, F. Semeria, P. Shagin, E. Shockley, M. Silva, H.
Simgen, A. Takeda, C. Therreau, D. Thers, F. Toschi, G. Trinchero, C.
Tunnell, M. Vargas, G. Volta, H. Wang, Y. Wei, C. Weinheimer, M. Weiss, D.
Wenz, C. Wittweg, Z. Xu, M. Yamashita, J. Ye, G. Zavattini, Y. Zhang, T. Zhu,
J. P. Zopounidis, X. Mougeot
|
Excess Electronic Recoil Events in XENON1T
|
26 pages, 15 figures. v2 added Ar37 background discussion and
best-fit mass of bosonic dark matter, v3 updated Ar37 discussion, tritium
estimation, and solar axion energy spectrum. Data in Fig. 2, 4, and 15,
including unbinned energy points in Fig. 4, are available in
10.5281/zenodo.4088778
|
Phys. Rev. D 102, 072004 (2020)
|
10.1103/PhysRevD.102.072004
| null |
hep-ex astro-ph.CO hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We report results from searches for new physics with low-energy electronic
recoil data recorded with the XENON1T detector. With an exposure of 0.65 t-y
and an unprecedentedly low background rate of $76\pm2$ events/(t y keV) between
1 and 30 keV, the data enables sensitive searches for solar axions, an enhanced
neutrino magnetic moment, and bosonic dark matter. An excess over known
backgrounds is observed at low energies and most prominent between 2 and 3 keV.
The solar axion model has a 3.4$\sigma$ significance, and a 3D 90% confidence
surface is reported for axion couplings to electrons, photons, and nucleons.
This surface is inscribed in the cuboid defined by $g_{ae}<3.8 \times
10^{-12}$, $g_{ae}g_{an}^{eff}<4.8\times 10^{-18}$, and
$g_{ae}g_{a\gamma}<7.7\times10^{-22} GeV^{-1}$, and excludes either $g_{ae}=0$
or $g_{ae}g_{a\gamma}=g_{ae}g_{an}^{eff}=0$. The neutrino magnetic moment
signal is similarly favored over background at 3.2$\sigma$ and a confidence
interval of $\mu_{\nu} \in (1.4,2.9)\times10^{-11}\mu_B$ (90% C.L.) is
reported. Both results are in strong tension with stellar constraints. The
excess can also be explained by $\beta$ decays of tritium at 3.2$\sigma$ with a
trace amount that can neither be confirmed nor excluded with current knowledge
of its production and reduction mechanisms. The significances of the solar
axion and neutrino magnetic moment hypotheses are reduced to 2.0$\sigma$ and
0.9$\sigma$, respectively, if an unconstrained tritium component is included in
the fitting. With respect to bosonic dark matter, the excess favors a
monoenergetic peak at ($2.3\pm0.2$) keV (68% C.L.) with a 3.0$\sigma$ global
(4.0$\sigma$ local) significance. We also consider the possibility that
$^{37}$Ar may be present in the detector and yield a 2.82 keV peak. Contrary to
tritium, the $^{37}$Ar concentration can be tightly constrained and is found to
be negligible.
|
[{'version': 'v1', 'created': 'Wed, 17 Jun 2020 08:44:06 GMT'}
{'version': 'v2', 'created': 'Tue, 30 Jun 2020 17:59:18 GMT'}
{'version': 'v3', 'created': 'Fri, 16 Oct 2020 14:35:06 GMT'}]
|
2020-10-19
|
[array(['Aprile', 'E.', ''], dtype=object)
array(['Aalbers', 'J.', ''], dtype=object)
array(['Agostini', 'F.', ''], dtype=object)
array(['Alfonsi', 'M.', ''], dtype=object)
array(['Althueser', 'L.', ''], dtype=object)
array(['Amaro', 'F. D.', ''], dtype=object)
array(['Antochi', 'V. C.', ''], dtype=object)
array(['Angelino', 'E.', ''], dtype=object)
array(['Angevaare', 'J. R.', ''], dtype=object)
array(['Arneodo', 'F.', ''], dtype=object)
array(['Barge', 'D.', ''], dtype=object)
array(['Baudis', 'L.', ''], dtype=object)
array(['Bauermeister', 'B.', ''], dtype=object)
array(['Bellagamba', 'L.', ''], dtype=object)
array(['Benabderrahmane', 'M. L.', ''], dtype=object)
array(['Berger', 'T.', ''], dtype=object)
array(['Brown', 'A.', ''], dtype=object)
array(['Brown', 'E.', ''], dtype=object)
array(['Bruenner', 'S.', ''], dtype=object)
array(['Bruno', 'G.', ''], dtype=object)
array(['Budnik', 'R.', ''], dtype=object)
array(['Capelli', 'C.', ''], dtype=object)
array(['Cardoso', 'J. M. R.', ''], dtype=object)
array(['Cichon', 'D.', ''], dtype=object)
array(['Cimmino', 'B.', ''], dtype=object)
array(['Clark', 'M.', ''], dtype=object)
array(['Coderre', 'D.', ''], dtype=object)
array(['Colijn', 'A. P.', ''], dtype=object)
array(['Conrad', 'J.', ''], dtype=object)
array(['Cussonneau', 'J. P.', ''], dtype=object)
array(['Decowski', 'M. P.', ''], dtype=object)
array(['Depoian', 'A.', ''], dtype=object)
array(['Di Gangi', 'P.', ''], dtype=object)
array(['Di Giovanni', 'A.', ''], dtype=object)
array(['Di Stefano', 'R.', ''], dtype=object)
array(['Diglio', 'S.', ''], dtype=object)
array(['Elykov', 'A.', ''], dtype=object)
array(['Eurin', 'G.', ''], dtype=object)
array(['Ferella', 'A. D.', ''], dtype=object)
array(['Fulgione', 'W.', ''], dtype=object)
array(['Gaemers', 'P.', ''], dtype=object)
array(['Gaior', 'R.', ''], dtype=object)
array(['Galloway', 'M.', ''], dtype=object)
array(['Gao', 'F.', ''], dtype=object)
array(['Grandi', 'L.', ''], dtype=object)
array(['Hasterok', 'C.', ''], dtype=object)
array(['Hils', 'C.', ''], dtype=object)
array(['Hiraide', 'K.', ''], dtype=object)
array(['Hoetzsch', 'L.', ''], dtype=object)
array(['Howlett', 'J.', ''], dtype=object)
array(['Iacovacci', 'M.', ''], dtype=object)
array(['Itow', 'Y.', ''], dtype=object)
array(['Joerg', 'F.', ''], dtype=object)
array(['Kato', 'N.', ''], dtype=object)
array(['Kazama', 'S.', ''], dtype=object)
array(['Kobayashi', 'M.', ''], dtype=object)
array(['Koltman', 'G.', ''], dtype=object)
array(['Kopec', 'A.', ''], dtype=object)
array(['Landsman', 'H.', ''], dtype=object)
array(['Lang', 'R. F.', ''], dtype=object)
array(['Levinson', 'L.', ''], dtype=object)
array(['Lin', 'Q.', ''], dtype=object)
array(['Lindemann', 'S.', ''], dtype=object)
array(['Lindner', 'M.', ''], dtype=object)
array(['Lombardi', 'F.', ''], dtype=object)
array(['Long', 'J.', ''], dtype=object)
array(['Lopes', 'J. A. M.', ''], dtype=object)
array(['Fune', 'E. López', ''], dtype=object)
array(['Macolino', 'C.', ''], dtype=object)
array(['Mahlstedt', 'J.', ''], dtype=object)
array(['Mancuso', 'A.', ''], dtype=object)
array(['Manenti', 'L.', ''], dtype=object)
array(['Manfredini', 'A.', ''], dtype=object)
array(['Marignetti', 'F.', ''], dtype=object)
array(['Undagoitia', 'T. Marrodán', ''], dtype=object)
array(['Martens', 'K.', ''], dtype=object)
array(['Masbou', 'J.', ''], dtype=object)
array(['Masson', 'D.', ''], dtype=object)
array(['Mastroianni', 'S.', ''], dtype=object)
array(['Messina', 'M.', ''], dtype=object)
array(['Miuchi', 'K.', ''], dtype=object)
array(['Mizukoshi', 'K.', ''], dtype=object)
array(['Molinario', 'A.', ''], dtype=object)
array(['Morå', 'K.', ''], dtype=object)
array(['Moriyama', 'S.', ''], dtype=object)
array(['Mosbacher', 'Y.', ''], dtype=object)
array(['Murra', 'M.', ''], dtype=object)
array(['Naganoma', 'J.', ''], dtype=object)
array(['Ni', 'K.', ''], dtype=object)
array(['Oberlack', 'U.', ''], dtype=object)
array(['Odgers', 'K.', ''], dtype=object)
array(['Palacio', 'J.', ''], dtype=object)
array(['Pelssers', 'B.', ''], dtype=object)
array(['Peres', 'R.', ''], dtype=object)
array(['Pienaar', 'J.', ''], dtype=object)
array(['Pizzella', 'V.', ''], dtype=object)
array(['Plante', 'G.', ''], dtype=object)
array(['Qin', 'J.', ''], dtype=object)
array(['Qiu', 'H.', ''], dtype=object)
array(['García', 'D. Ramírez', ''], dtype=object)
array(['Reichard', 'S.', ''], dtype=object)
array(['Rocchetti', 'A.', ''], dtype=object)
array(['Rupp', 'N.', ''], dtype=object)
array(['Santos', 'J. M. F. dos', ''], dtype=object)
array(['Sartorelli', 'G.', ''], dtype=object)
array(['Šarčević', 'N.', ''], dtype=object)
array(['Scheibelhut', 'M.', ''], dtype=object)
array(['Schreiner', 'J.', ''], dtype=object)
array(['Schulte', 'D.', ''], dtype=object)
array(['Schumann', 'M.', ''], dtype=object)
array(['Lavina', 'L. Scotto', ''], dtype=object)
array(['Selvi', 'M.', ''], dtype=object)
array(['Semeria', 'F.', ''], dtype=object)
array(['Shagin', 'P.', ''], dtype=object)
array(['Shockley', 'E.', ''], dtype=object)
array(['Silva', 'M.', ''], dtype=object)
array(['Simgen', 'H.', ''], dtype=object)
array(['Takeda', 'A.', ''], dtype=object)
array(['Therreau', 'C.', ''], dtype=object)
array(['Thers', 'D.', ''], dtype=object)
array(['Toschi', 'F.', ''], dtype=object)
array(['Trinchero', 'G.', ''], dtype=object)
array(['Tunnell', 'C.', ''], dtype=object)
array(['Vargas', 'M.', ''], dtype=object)
array(['Volta', 'G.', ''], dtype=object)
array(['Wang', 'H.', ''], dtype=object)
array(['Wei', 'Y.', ''], dtype=object)
array(['Weinheimer', 'C.', ''], dtype=object)
array(['Weiss', 'M.', ''], dtype=object)
array(['Wenz', 'D.', ''], dtype=object)
array(['Wittweg', 'C.', ''], dtype=object)
array(['Xu', 'Z.', ''], dtype=object)
array(['Yamashita', 'M.', ''], dtype=object)
array(['Ye', 'J.', ''], dtype=object)
array(['Zavattini', 'G.', ''], dtype=object)
array(['Zhang', 'Y.', ''], dtype=object)
array(['Zhu', 'T.', ''], dtype=object)
array(['Zopounidis', 'J. P.', ''], dtype=object)
array(['Mougeot', 'X.', ''], dtype=object)]
|
5,830 |
0708.1369
|
Seong-Gon Kim
|
J. Houze, Sungho Kim, Seong-Jin Park, Randall M. German, M. F.
Horstemeyer, and Seong-Gon Kim
|
The effect of Fe atoms on the adsorption of a W atom on W(100) surface
|
9 pages, 2 figures
| null |
10.1063/1.2924411
| null |
cond-mat.mtrl-sci
| null |
We report a first-principles calculation that models the effect of iron (Fe)
atoms on the adsorption of a tungsten (W) atom on W(100) surfaces. The
adsorption of a W atom on a clean W(100) surface is compared with that of a W
atom on a W(100) surface covered with a monolayer of Fe atoms. The total energy
of the system is computed as the function of the height of the W adatom. Our
result shows that the W atom first adsorbs on top of the Fe monolayer. Then the
W atom can replace one of the Fe atoms through a path with a moderate energy
barrier and reduce its energy further. This intermediate site makes the
adsorption (and desorption) of W atoms a two-step process in the presence of Fe
atoms and lowers the overall adsorption energy by nearly 2.4 eV. The Fe atoms
also provide a surface for W atoms to adsorb facilitating the diffusion of W
atoms. The combination of these two effects result in a much more efficient
desorption and diffusion of W atoms in the presence of Fe atoms. Our result
provides a fundamental mechanism that can explain the activated sintering of
tungsten by Fe atoms.
|
[{'version': 'v1', 'created': 'Fri, 10 Aug 2007 05:58:29 GMT'}]
|
2009-11-13
|
[array(['Houze', 'J.', ''], dtype=object)
array(['Kim', 'Sungho', ''], dtype=object)
array(['Park', 'Seong-Jin', ''], dtype=object)
array(['German', 'Randall M.', ''], dtype=object)
array(['Horstemeyer', 'M. F.', ''], dtype=object)
array(['Kim', 'Seong-Gon', ''], dtype=object)]
|
5,831 |
2010.00301
|
Pablo Ouro
|
Pablo Ouro and Maxime Lazennec
|
Analytical models for the asymmetric wake of vertical axis wind turbines
|
22 pages, 8 figures
| null |
10.1017/flo.2021.4
| null |
physics.flu-dyn
|
http://creativecommons.org/licenses/by/4.0/
|
Arrays of Vertical Axis Wind Turbines (VAWTs) can achieve larger power
generation per land area than horizontal axis turbines farms, due to the
positive synergy between VATs in close proximity. Theoretical wake models
enable the reliable design of the array layout that maximises the energy
output, which need to depict the driving wake dynamics. VAWTs generate a highly
complex wake that evolves according to two governing length-scales, namely the
turbine rotor's diameter and height which define a rectangular shape of the
wake cross-section, and feature distinct wake expansion rates. This paper
presents analytical VAWT wake models that account for an asymmetric
distribution of such wake expansion adopting a top-hat and Gaussian velocity
deficit distribution. Our proposed analytical Gaussian model leads to an
enhanced initial wake expansion prediction with the wake width ($\varepsilon$)
behind the rotor equal to $(\beta/4 \pi)^{1/2}$ with $\beta$ being the ratio of
initial wake area to the VAWT's frontal area, which addresses the limitations
of previous models that under-predicted the wake onset area. Velocity deficit
predictions are calculated in a series of numerical benchmarks consisting of a
single and an array of four in-line vertical axis wind turbines. In comparisons
with field data and large-eddy simulations, our models provide a good accuracy
to represent the mean wake distribution, maximum velocity deficit, and momentum
thickness, with the Gaussian model attaining the best predictions.These models
will aid to drive the design of VAT arrays and accelerate this technology.
|
[{'version': 'v1', 'created': 'Thu, 1 Oct 2020 11:02:08 GMT'}]
|
2023-01-10
|
[array(['Ouro', 'Pablo', ''], dtype=object)
array(['Lazennec', 'Maxime', ''], dtype=object)]
|
5,832 |
gr-qc/0607079
|
Nicos Pelavas
|
A.A. Coley and N. Pelavas
|
Averaging in Spherically Symmetric Cosmology
| null |
Phys.Rev.D75:043506,2007
|
10.1103/PhysRevD.75.043506
| null |
gr-qc astro-ph
| null |
In the macroscopic gravity approach to the averaging problem in cosmology,
the Einstein field equations on cosmological scales are modified by appropriate
gravitational correlation terms. We study the averaging problem within the
class of spherically symmetric cosmological models. That is, we shall take the
microscopic equations and effect the averaging procedure to determine the
precise form of the correlation tensor in this case. In particular, by working
in volume preserving coordinates, we calculate the form of the correlation
tensor under some reasonable assumptions on the form for the inhomogeneous
gravitational field and matter distribution. We find that the correlation
tensor in a FLRW background must be of the form of a spatial curvature.
Inhomogeneities and spatial averaging, through this spatial curvature
correction term, can have a very significant dynamical effect on the dynamics
of the Universe and cosmological observations; in particular, we discuss
whether spatial averaging might lead to a more conservative explanation of the
observed acceleration of the Universe (without the introduction of exotic dark
matter fields). We also find that the correlation tensor for a non-FLRW
background can be interpreted as the sum of a spatial curvature and an
anisotropic fluid. This may lead to interesting effects of averaging on
astrophysical scales. We also discuss the results of averaging an inhomogeneous
Lemaitre-Tolman-Bondi solution as well as calculations of linear perturbations
(that is, the back-reaction) in an FLRW background, which support the main
conclusions of the analysis.
|
[{'version': 'v1', 'created': 'Thu, 20 Jul 2006 13:15:41 GMT'}
{'version': 'v2', 'created': 'Sun, 24 Sep 2006 16:12:46 GMT'}
{'version': 'v3', 'created': 'Wed, 21 Feb 2007 04:12:54 GMT'}]
|
2008-11-26
|
[array(['Coley', 'A. A.', ''], dtype=object)
array(['Pelavas', 'N.', ''], dtype=object)]
|
5,833 |
1412.7882
|
Raul Curto
|
Raul E. Curto and Seonguk Yoo
|
Concrete Solution to the Nonsingular Quartic Binary Moment Problem
| null | null |
10.1090/proc/12698
| null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given real numbers $\beta \equiv \beta ^{\left( 4\right) }\colon \beta_{00}$,
$\beta _{10}$, $\beta _{01}$, $\beta _{20}$, $\beta _{11}$, $ \beta _{02}$,
$\beta _{30}$, $\beta _{21}$, $\beta _{12}$, $\beta _{03}$, $\beta _{40}$,
$\beta _{31}$, $\beta _{22}$, $\beta _{13}$, $\beta _{04}$, with $\beta _{00}
>0$, the quartic real moment problem for $\beta $ entails finding conditions
for the existence of a positive Borel measure $\mu $, supported in
$\mathbb{R}^2$, such that $\beta _{ij}=\int s^{i}t^{j}\,d\mu \;\;(0\leq i+j\leq
4) $. Let $\mathcal{M}(2)$ be the 6 x 6 moment matrix for $\beta^{(4)}$, given
by $\mathcal{M}(2)_{\mathbf{i},\mathbf{j}}:=\beta_{\mathbf{i}+\mathbf{j}}$,
where $\mathbf{i},\mathbf{j} \in \mathbb{Z}^2_+$ and
$\left|\mathbf{i}\right|,\left|\mathbf{j}\right|\le 2$. In this note we find
concrete representing measures for $\beta^{(4)}$ when $\mathcal{M}(2)$ is
nonsingular; moreover, we prove that it is possible to ensure that one such
representing measure is 6-atomic.
|
[{'version': 'v1', 'created': 'Fri, 26 Dec 2014 02:35:00 GMT'}]
|
2015-11-24
|
[array(['Curto', 'Raul E.', ''], dtype=object)
array(['Yoo', 'Seonguk', ''], dtype=object)]
|
5,834 |
1412.1519
|
David Zimmermann
|
David Zimmermann
|
Elementary proof of logarithmic Sobolev inequalities for Gaussian
convolutions on $\mathbb{R}$
| null | null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a 2013 paper, the author showed that the convolution of a compactly
supported measure on the real line with a Gaussian measure satisfies a
logarithmic Sobolev inequality (LSI). In a 2014 paper, the author gave bounds
for the optimal constants in these LSIs. In this paper, we give a simpler,
elementary proof of this result.
|
[{'version': 'v1', 'created': 'Wed, 3 Dec 2014 23:34:18 GMT'}]
|
2014-12-05
|
[array(['Zimmermann', 'David', ''], dtype=object)]
|
5,835 |
1408.2308
|
Chuan Li Dr.
|
Chuan Li, Leonty Miroshnichenko, and Cheng Fang
|
Proton activity of the Sun in current solar cycle 24
|
9 pages, 3 figures, submitted to RAA (Research in Astronomy and
Astrophysics)
| null | null | null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of 7 large solar proton events (SPEs) of current solar
cycle 24 (from 2009 January up to date). They were recorded by GOES spacecraft
with highest proton fluxes over 200 pfu for energies $>$10 MeV. In situ
particle measurements show that: (1) The profiles of the proton fluxes are
highly dependent of the locations of their solar sources, namely flares or
coronal mass ejections (CMEs); (2) The solar particle release (SPR) times fall
in the decay phase of the flare emission, and are in accordance with the times
when the CMEs travel to an average height of 7.9 solar radii; (3) The time
differences between the SPR and the flare peak are also dependent of the
locations of the solar active regions (ARs). The results tend to support the
concept of proton acceleration by the CME-driven shock, even though there
exists a possibility of particle acceleration at flare site with subsequent
perpendicular diffusion of accelerated particles in the interplanetary magnetic
field (IMF). We derive the integral time-of-maximum (TOM) spectra of solar
protons in two forms: a single power-law distribution and a power law broken
with an exponential tail. It is found that the unique Ground Level Enhancement
(GLE) event on 2012 May 17 displays a hardest spectrum and a largest broken
energy that may explain why the this event could extend to relativistic energy.
|
[{'version': 'v1', 'created': 'Mon, 11 Aug 2014 04:58:09 GMT'}]
|
2014-08-12
|
[array(['Li', 'Chuan', ''], dtype=object)
array(['Miroshnichenko', 'Leonty', ''], dtype=object)
array(['Fang', 'Cheng', ''], dtype=object)]
|
5,836 |
1709.07157
|
Arghir Zarnescu
|
Adrian C. Murza, Antonio E. Teruel, Arghir D. Zarnescu
|
Shear flow dynamics in the Beris-Edwards model of nematic liquid
crystals
| null | null |
10.1098/rspa.2017.0673
| null |
math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the Beris-Edwards model describing nematic liquid crystal
dynamics and restrict to a shear flow and spatially homogeneous situation. We
analyze the dynamics focusing on the effect of the flow. We show that in the
co-rotational case one has gradient dynamics, up to a periodic eigenframe
rotation, while in the non-co-rotational case we identify the short and long
time regime of the dynamics. We express these in terms of the physical
variables and compare with the predictions of other models of liquid crystal
dynamics.
|
[{'version': 'v1', 'created': 'Thu, 21 Sep 2017 04:55:57 GMT'}]
|
2018-05-09
|
[array(['Murza', 'Adrian C.', ''], dtype=object)
array(['Teruel', 'Antonio E.', ''], dtype=object)
array(['Zarnescu', 'Arghir D.', ''], dtype=object)]
|
5,837 |
gr-qc/0604045
|
Carlo Rovelli
|
Carlo Rovelli
|
Unfinished revolution
|
8 pages. Version 2: minor corrections
| null | null | null |
gr-qc hep-th
| null |
Introductive chapter of a book on Quantum Gravity, edited by Daniele Oriti,
to appear with Cambridge University Press.
|
[{'version': 'v1', 'created': 'Mon, 10 Apr 2006 13:06:39 GMT'}
{'version': 'v2', 'created': 'Thu, 13 Apr 2006 07:55:42 GMT'}]
|
2007-05-23
|
[array(['Rovelli', 'Carlo', ''], dtype=object)]
|
5,838 |
2002.06652
|
Bin Wang
|
Bin Wang, C.-C. Jay Kuo
|
SBERT-WK: A Sentence Embedding Method by Dissecting BERT-based Word
Models
| null | null | null | null |
cs.CL cs.LG cs.MM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sentence embedding is an important research topic in natural language
processing (NLP) since it can transfer knowledge to downstream tasks.
Meanwhile, a contextualized word representation, called BERT, achieves the
state-of-the-art performance in quite a few NLP tasks. Yet, it is an open
problem to generate a high quality sentence representation from BERT-based word
models. It was shown in previous study that different layers of BERT capture
different linguistic properties. This allows us to fusion information across
layers to find better sentence representation. In this work, we study the
layer-wise pattern of the word representation of deep contextualized models.
Then, we propose a new sentence embedding method by dissecting BERT-based word
models through geometric analysis of the space spanned by the word
representation. It is called the SBERT-WK method. No further training is
required in SBERT-WK. We evaluate SBERT-WK on semantic textual similarity and
downstream supervised tasks. Furthermore, ten sentence-level probing tasks are
presented for detailed linguistic analysis. Experiments show that SBERT-WK
achieves the state-of-the-art performance. Our codes are publicly available.
|
[{'version': 'v1', 'created': 'Sun, 16 Feb 2020 19:02:52 GMT'}
{'version': 'v2', 'created': 'Mon, 1 Jun 2020 17:39:09 GMT'}]
|
2020-06-02
|
[array(['Wang', 'Bin', ''], dtype=object)
array(['Kuo', 'C. -C. Jay', ''], dtype=object)]
|
5,839 |
quant-ph/0012044
|
Dimiter Trifonov
|
D.A. Trifonov
|
Diagonalization of Hamiltonians, uncertainty matrices and Robertson
inequality
|
18 pages, Latex, no figures. To appear in the Proceedings of the
Second Int. Conference on Geometry, Integrability and Quantization, Varna,
June, 2000
|
In "Geometry, Integrability and Quantization", eds: I.Mladenov and
G.Naber (Coral Press, 2001) pp. 294-312
| null | null |
quant-ph
| null |
The problem of diagonalization of Hamiltonians of N-dimensional boson systems
by means of time-dependent canonical transformations (CT) is considered, the
case of quadratic Hamiltonians being treated in greater detail. The unitary
generator of time-dependent CT which can transform any Hamiltonian to that of a
system of uncoupled stationary oscillators is constructed. The close
relationship between methods of canonical transformations, time-dependent
integrals of motion and dynamical symmetry is noted.
The diagonalization and symplectic properties of the uncertainty matrix for
2N canonical observables are studied. It is shown that the normalized
uncertainty matrix is symplectic for the squeezed multimode Glauber coherent
states and for the squeezed Fock states with equal photon numbers in each mode.
The Robertson uncertainty relation for the dispersion matrix of canonical
observables is shown to be minimized in squeezed coherent states only.
|
[{'version': 'v1', 'created': 'Mon, 11 Dec 2000 17:23:29 GMT'}]
|
2007-05-23
|
[array(['Trifonov', 'D. A.', ''], dtype=object)]
|
5,840 |
hep-ph/0302055
|
Hector DE Vega
|
D. Boyanovsky, H. J. de Vega
|
Dynamical renormalization group approach to relaxation in quantum field
theory
|
LaTex, 27 pages, 2 .ps figures
|
Annals Phys. 307 (2003) 335-371
|
10.1016/S0003-4916(03)00115-5
| null |
hep-ph cond-mat hep-th nucl-th
| null |
The real time evolution and relaxation of expectation values of quantum
fields and of quantum states are computed as initial value problems by
implementing the dynamical renormalization group (DRG).Linear response is
invoked to set up the renormalized initial value problem to study the dynamics
of the expectation value of quantum fields. The perturbative solution of the
equations of motion for the field expectation values of quantum fields as well
as the evolution of quantum states features secular terms, namely terms that
grow in time and invalidate the perturbative expansion for late times. The DRG
provides a consistent framework to resum these secular terms and yields a
uniform asymptotic expansion at long times. Several relevant cases are studied
in detail, including those of threshold infrared divergences which appear in
gauge theories at finite temperature and lead to anomalous relaxation. In these
cases the DRG is shown to provide a resummation akin to Bloch-Nordsieck but
directly in real time and that goes beyond the scope of Bloch-Nordsieck and
Dyson resummations. The nature of the resummation program is discussed in
several examples. The DRG provides a framework that is consistent, systematic
and easy to implement to study the non-equilibrium relaxational dynamics
directly in real time that does not rely on the concept of quasiparticle
widths.
|
[{'version': 'v1', 'created': 'Fri, 7 Feb 2003 18:12:59 GMT'}]
|
2009-11-10
|
[array(['Boyanovsky', 'D.', ''], dtype=object)
array(['de Vega', 'H. J.', ''], dtype=object)]
|
5,841 |
physics/0107027
|
Constantin P. Kouropoulos
|
C.P.Kouropoulos
|
Induced Gravity in the Short Range
|
11 pages, text corrected
| null | null | null |
physics.gen-ph
| null |
We consider a pair of harmonic oscillators in two or three dimensions of
space coupled by the standard electrodynamic forces : the Coulomb, the Lorentz
and the electrokinetic forces. The addition of the Lorentz force is mainly felt
in the short range and suppresses the radial correlated oscillating mode of
such coupled oscillators. This imposes constraints on the system that make the
two transverse modes degenerate. As a result, an 1/r antigravitational
interaction now appears in the surviving anticorrelated radial zero-mode, which
does not allow coherent states to form. As gravitation can only emerge from
coherent modes, it can no longer be transitive. Matter in high densities would
thus tend to increase its disorder, decouple from its own gravity, from the
ordering far infrared Machian background that coheres its rest energy and would
become intrinsically unstable. The highly energetic jets from galactic nuclei
could be the consequence.
|
[{'version': 'v1', 'created': 'Fri, 13 Jul 2001 07:02:25 GMT'}
{'version': 'v2', 'created': 'Thu, 9 Aug 2001 15:04:54 GMT'}]
|
2007-05-23
|
[array(['Kouropoulos', 'C. P.', ''], dtype=object)]
|
5,842 |
0912.2324
|
Bhaskar Dutta
|
Rouzbeh Allahverdi, Bhaskar Dutta, Kuver Sinha
|
Low-scale Inflation and Supersymmetry Breaking in Racetrack Models
|
10 pages, 3 Figures, Latex
|
Phys.Rev.D81:083538,2010
|
10.1103/PhysRevD.81.083538
|
MIFTP-09-48
|
hep-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In many moduli stabilization schemes in string theory, the scale of inflation
appears to be of the same order as the scale of supersymmetry breaking. For
low-scale supersymmetry breaking, therefore, the scale of inflation should also
be low, unless this correlation is avoided in specific models. We explore such
a low-scale inflationary scenario in a racetrack model with a single modulus in
type IIB string theory. Inflation occurs near a point of inflection in the
K\"ahler modulus potential. Obtaining acceptable cosmological density
perturbations leads to the introduction of magnetized D7-branes sourcing
non-perturbative superpotentials. The gravitino mass, m_{3/2}, is chosen to be
around 30 TeV, so that gravitinos that are produced in the inflaton decay do
not affect big-bang nucleosynthesis. Supersymmetry is communicated to the
visible sector by a mixture of anomaly and modulus mediation. We find that the
two sources contribute equally to the gaugino masses, while scalar masses are
decided mainly by anomaly contribution. This happens as a result of the low
scale of inflation and can be probed at the LHC.
|
[{'version': 'v1', 'created': 'Fri, 11 Dec 2009 19:08:22 GMT'}]
|
2010-05-12
|
[array(['Allahverdi', 'Rouzbeh', ''], dtype=object)
array(['Dutta', 'Bhaskar', ''], dtype=object)
array(['Sinha', 'Kuver', ''], dtype=object)]
|
5,843 |
cond-mat/0703306
|
Ruslan Prozorov
|
Ruslan Prozorov, Tanya Prozorov, Timothy J. Williams, Dennis A.
Bazylinski, Surya K. Mallapragada, Balaji Narasimhan
|
Magnetic irreversibility and Verwey transition in nano-crystalline
bacterial magnetite
| null | null |
10.1103/PhysRevB.76.054406
| null |
cond-mat.str-el cond-mat.mtrl-sci
| null |
The magnetic properties of biologically-produced magnetite nanocrystals
biomineralized by four different magnetotactic bacteria were compared to those
of synthetic magnetite nanocrystals and large, high quality single crystals.
The magnetic feature at the Verwey temperature, $T_{V}$, was clearly seen in
all nanocrystals, although its sharpness depended on the shape of individual
nanoparticles and whether or not the particles were arranged in magnetosome
chains. The transition was broader in the individual superparamagnetic
nanoparticles for which $T_{B}<T_{V}$, where $T_{B}$ is the superparamagnetic
blocking temperature. For the nanocrystals organized in chains, the effective
blocking temperature $T_{B}>T_{V}$ and the Verwey transition is sharply
defined. No correlation between the particle size and $T_{V}$ was found.
Furthermore, measurements of $M(H,T,time)$ suggest that magnetosome chains
behave as long magnetic dipoles where the local magnetic field is directed
along the chain and this result confirms that time-logarithmic magnetic
relaxation is due to the collective (dipolar) nature of the barrier for
magnetic moment reorientation.
|
[{'version': 'v1', 'created': 'Mon, 12 Mar 2007 19:08:27 GMT'}
{'version': 'v2', 'created': 'Sun, 20 May 2007 18:49:25 GMT'}]
|
2009-11-13
|
[array(['Prozorov', 'Ruslan', ''], dtype=object)
array(['Prozorov', 'Tanya', ''], dtype=object)
array(['Williams', 'Timothy J.', ''], dtype=object)
array(['Bazylinski', 'Dennis A.', ''], dtype=object)
array(['Mallapragada', 'Surya K.', ''], dtype=object)
array(['Narasimhan', 'Balaji', ''], dtype=object)]
|
5,844 |
1801.04518
|
Stephane Boubanga Tombet
|
Stephane Boubanga-Tombet, Deepika Yadav, Wojciech Knap, Vyacheslav V.
Popov, Taichii Otsuji
|
Plasmonic instabilities and terahertz waves amplification in graphene
metamaterials
| null | null | null | null |
physics.app-ph cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Plasmon oscillations have been intensively studied for more than forty years
in conventional two-dimensional electron gas systems in order to find new
alternatives to the vacuum devices based on the Smith-Purcell effect in the
far-infrared region. However, beside the multiple endeavors, up to date, the
plasmon generation in semiconductor heterostructures has been very inefficient.
Here we demonstrate that the use of high mobility graphene metamaterials, due
to their well-known stronger light-plasmon coupling compared to semiconductor
materials can significantly improve the efficiency of far-infrared plasmonic
amplifiers and generators. We explore current-driven plasmon dynamics including
perfect transparency and light amplification in monolayer graphene structures.
Current-induced complete suppression of the graphene absorption is
experimentally observed in a broad frequency range followed by a giant
amplification (up to about 9 % gain) of an incoming terahertz radiation at room
temperature. These active plasmonic processes are triggered by relatively low
bias voltage in the graphene devices leading to external quantum efficiency of
about two orders of magnitude higher than those of the popular
optical-to-terahertz conversion devices largely used in far-infrared
technologies. Our results combined with the relatively low level of losses and
high degree of spatial confinement of plasmons in graphene will open pathways
for a wide range of integrated high speed active optoelectronics devices.
|
[{'version': 'v1', 'created': 'Sun, 14 Jan 2018 06:30:30 GMT'}]
|
2018-01-16
|
[array(['Boubanga-Tombet', 'Stephane', ''], dtype=object)
array(['Yadav', 'Deepika', ''], dtype=object)
array(['Knap', 'Wojciech', ''], dtype=object)
array(['Popov', 'Vyacheslav V.', ''], dtype=object)
array(['Otsuji', 'Taichii', ''], dtype=object)]
|
5,845 |
1104.2255
|
Kenji Ogawa Dr.
|
Kenji Ogawa
|
New One-Flavor Hybrid Monte Carlo Simulation Method for Lattice Fermions
with gamma-five Hermiticity
|
13 pages
| null |
10.1016/j.physletb.2011.09.023
| null |
hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new method for Hybrid Monte Carlo (HMC) simulations with odd
numbers of dynamical fermions on the lattice. It employs a different approach
from polynomial or rational HMC. In this method, gamma-five hermiticity of the
lattice Dirac operators is crucial and it can be applied to Wilson,
domain-wall, and overlap fermions. We compare HMC simulations with two
degenerate flavors and (1 + 1) degenerate flavors using optimal domain-wall
fermions. The ratio of the efficiency, (number of accepted trajectories) /
(simulation time), is about 3:2. The relation between pseudofermion action of
chirally symmetric lattice fermions in four-dimensional(overlap) and
five-dimensional(domain-wall) representation are also analyzed.
|
[{'version': 'v1', 'created': 'Tue, 12 Apr 2011 16:10:56 GMT'}]
|
2015-05-27
|
[array(['Ogawa', 'Kenji', ''], dtype=object)]
|
5,846 |
quant-ph/0601194
|
HyungJin Yang
|
Changho Hong, Jiin Kim, Hwayean Lee, and Hyungjin Yang
|
Authenticated Multiuser Quantum Direct Communication using Entanglement
Swapping
|
8 pages
| null | null | null |
quant-ph
| null |
We present Authenticated Multiuser Quantum Direct Communication(MQDC)
protocols using entanglement swapping. Quantum direct communication is believed
to be a safe way to send a secret message without quantum key distribution. The
authentication process in our protocol allows only proper users to participate
in communication. In the communication stage after the authentication, any two
authorized users among n users can communicate each other even though there is
no quantum communication channels between them. For this protocol, we need only
n quantum communication channels between the authenticator and n users. It is
similar to the present telephone system in which there are n communication
channels between telephone company and users and any two designated users can
communicate each other using telephone line through the telephone company. The
securities of our protocols are analysed to be the same as those of other
quantum key distribution protocols.
|
[{'version': 'v1', 'created': 'Sun, 29 Jan 2006 09:26:41 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Feb 2006 11:42:31 GMT'}]
|
2007-05-23
|
[array(['Hong', 'Changho', ''], dtype=object)
array(['Kim', 'Jiin', ''], dtype=object)
array(['Lee', 'Hwayean', ''], dtype=object)
array(['Yang', 'Hyungjin', ''], dtype=object)]
|
5,847 |
1507.08783
|
Dalibor Stys
|
Dalibor Stys, Tomas Nahlik, Anna Zhyrova, Renata Rychtarikova, Stepan
Papacek, and Petr Cisar
|
Model of the Belousov-Zhabotinsky reaction
|
17 pages, 12 figures
|
LNCS 9611, 171-185, 2016
| null | null |
nlin.CG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The article describes results of the modified model of the
Belousov-Zhabotinsky reaction, which resembles rather well the limit set
observed upon experimental performance of the reaction in the Petri dish. We
discuss the concept of the ignition of circular waves and show that only the
asymmetrical ignition leads to the formation of spiral structures. From the
qualitative assumptions on the behavior of dynamic systems, we conclude that
the Belousov-Zhabotinsky reaction likely forms a regular grid.
|
[{'version': 'v1', 'created': 'Fri, 31 Jul 2015 07:44:09 GMT'}
{'version': 'v2', 'created': 'Fri, 29 Apr 2016 08:00:59 GMT'}]
|
2017-04-03
|
[array(['Stys', 'Dalibor', ''], dtype=object)
array(['Nahlik', 'Tomas', ''], dtype=object)
array(['Zhyrova', 'Anna', ''], dtype=object)
array(['Rychtarikova', 'Renata', ''], dtype=object)
array(['Papacek', 'Stepan', ''], dtype=object)
array(['Cisar', 'Petr', ''], dtype=object)]
|
5,848 |
hep-ph/0606090
|
T. Lappi
|
T. Lappi
|
Chemical composition of the decaying glasma
|
8 pages, 5 figures, invited talk at Stangeness in Quark Matter 2006
(SQM06), UCLA, March 2006
|
J.Phys. G32 (2006) S179-S185
|
10.1088/0954-3899/32/12/S23
| null |
hep-ph nucl-th
| null |
The the initial stage of a relativistic heavy ion collision can be described
by a classical color field configuration known as the Glasma. The production of
quark pairs from this background field is then computed nonperturbatively by
numerically solving the Dirac equation in the classical background. The result
seems to point towards an early chemical equilibration of the plasma.
|
[{'version': 'v1', 'created': 'Wed, 7 Jun 2006 23:28:10 GMT'}]
|
2007-05-23
|
[array(['Lappi', 'T.', ''], dtype=object)]
|
5,849 |
2005.06652
|
Oren Becker
|
Oren Becker, Michael Chapman
|
Stability of approximate group actions: uniform and probabilistic
|
35 pages, 2 figures
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that every uniform approximate homomorphism from a discrete amenable
group into a symmetric group is uniformly close to a homomorphism into a
slightly larger symmetric group. That is, amenable groups are uniformly
flexibly stable in permutations. This answers affirmatively a question of Kun
and Thom and a slight variation of a question of Lubotzky. We also give a
negative answer to Lubotzky's original question by showing that the group
$\mathbb{Z}$ is not uniformly strictly stable. Furthermore, we show that
$\text{SL}_{r}(\mathbb{Z})$, $r\geq3$, is uniformly flexibly stable, but the
free group $F_{r}$, $r\geq 2$, is not. We define and investigate a
probabilistic variant of uniform stability that has an application to property
testing.
|
[{'version': 'v1', 'created': 'Wed, 13 May 2020 22:38:07 GMT'}]
|
2020-05-15
|
[array(['Becker', 'Oren', ''], dtype=object)
array(['Chapman', 'Michael', ''], dtype=object)]
|
5,850 |
1108.5768
|
Caleb Phillips
|
Caleb Phillips, Rhonda Hoenigman, Becky Higbee
|
Food Redistribution as Optimization
|
University of Colorado, Computer Science Department, Technical Report
|
Phillips C, Hoenigman R, Higbee B, Reed T (2013) Understanding the
Sustainability of Retail Food Recovery. PLoS ONE 8(10): e75530
|
10.1371/journal.pone.007553
|
CU-CS-1085-11
|
cs.OH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we study the simultaneous problems of food waste and hunger in
the context of the possible solution of food (waste) rescue and redistribution.
To this end, we develop an empirical model that can be used in Monte Carlo
simulations to study the dynamics of the underlying problem. Our model's
parameters are derived from a unique data set provided by a large food bank and
food rescue organization in north central Colorado. We find that food supply is
a non-parametric heavy-tailed process that is well-modeled with an extreme
value peaks-over-threshold model. Although the underlying process is
stochastic, the basic approach of food rescue and redistribution appears to be
feasible both at small and large scales. The ultimate efficacy of this model is
intimately tied to the rate at which food expires and hence the ability to
preserve and quickly transport and redistribute food. The cost of the
redistribution is tied to the number and density of participating suppliers,
and costs can be reduced (and supply increased) simply by recruiting additional
donors to participate. Our results show that with sufficient funding and
manpower, a significant amount of food can be rescued from the waste stream and
used to feed the hungry.
|
[{'version': 'v1', 'created': 'Mon, 29 Aug 2011 21:52:04 GMT'}
{'version': 'v2', 'created': 'Fri, 25 Nov 2011 21:47:15 GMT'}]
|
2014-05-23
|
[array(['Phillips', 'Caleb', ''], dtype=object)
array(['Hoenigman', 'Rhonda', ''], dtype=object)
array(['Higbee', 'Becky', ''], dtype=object)]
|
5,851 |
1206.2883
|
Brian Huskinson
|
Brian Huskinson, Jason Rugolo, Sujit K. Mondal, and Michael J. Aziz
|
A High Power Density, High Efficiency Hydrogen-Chlorine Regenerative
Fuel Cell with a Low Precious Metal Content Catalyst
|
13 pages, 12 figures
| null | null | null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report the performance of a hydrogen-chlorine electrochemical cell with a
chlorine electrode employing a low precious metal content alloy oxide
electrocatalyst for the chlorine electrode: (Ru_0.09Co_0.91)_3O_4. The cell
employs a commercial hydrogen fuel cell electrode and transports protons
through a Nafion membrane in both galvanic and electrolytic mode. The peak
galvanic power density exceeds 1 W cm^-2, which is twice previous literature
values. The precious metal loading of the chlorine electrode is below 0.15 mg
Ru cm^-2. Virtually no activation losses are observed, allowing the cell to run
at nearly 0.4 W cm^-2 at 90% voltage efficiency. We report the effects of fluid
pressure, electrolyte acid concentration, and hydrogen-side humidification on
overall cell performance and efficiency. A comparison of our results to the
model of Rugolo et al. [Rugolo et al., J. Electrochem. Soc., 2012, 159, B133]
points out directions for further performance enhancement. The performance
reported here gives these devices promise for applications in carbon
sequestration and grid-scale electrical energy storage.
|
[{'version': 'v1', 'created': 'Wed, 13 Jun 2012 17:36:43 GMT'}]
|
2012-06-14
|
[array(['Huskinson', 'Brian', ''], dtype=object)
array(['Rugolo', 'Jason', ''], dtype=object)
array(['Mondal', 'Sujit K.', ''], dtype=object)
array(['Aziz', 'Michael J.', ''], dtype=object)]
|
5,852 |
astro-ph/0206018
|
Yuichi Terashima
|
Yuichi Terashima (1,2), Andrew S. Wilson (2) ((1) ISAS, (2) Univ. of
Maryland)
|
Chandra Snapshot Observations of LINERs with a Compact Radio Core
|
4 pages, To appear in the proceedings of the workshop "X-ray
spectroscopy of AGN with Chandra and XMM-Newton", Eds., Th. Boller, S.
Komossa, S. Kahn, and H. Kunieda
| null | null | null |
astro-ph
| null |
The results of Chandra snapshot observations of 11 LINERs (Low-Ionization
Nuclear Emission-line Regions), three low-luminosity Seyfert galaxies, and one
HII-LINER transition object are presented. Our sample consists of all the
objects with a flat or inverted spectrum compact radio core in the VLA survey
of 48 low-luminosity AGN (LLAGN) by Nagar et al. (2000). An X-ray nucleus is
detected in all galaxies except one and their X-ray luminosities are in the
range 5x10^38 to 8x10^41 ergs s^-1. The X-ray to Halpha luminosity ratios for
11 out of 14 objects are in good agreement with the value characteristic of
LLAGNs and more luminous AGNs, and indicate that their optical emission lines
are predominantly powered by a LLAGN. For three objects, this ratio is less
than expected. Comparing with multi-wavelength results, we find that these
three galaxies are most likely to be heavily obscured AGN. We compare the radio
to X-ray luminosity ratio of LLAGNs with those of more-luminous AGNs, and
confirm the suggestion that a large fraction of LLAGNs are radio loud.
|
[{'version': 'v1', 'created': 'Mon, 3 Jun 2002 05:01:11 GMT'}]
|
2007-05-23
|
[array(['Terashima', 'Yuichi', ''], dtype=object)
array(['Wilson', 'Andrew S.', ''], dtype=object)]
|
5,853 |
1703.08087
|
Jan Heisig
|
Chiara Arina, Mihailo Backovi\'c, Jan Heisig, Michele Lucente
|
Solar $\gamma$-rays as a Complementary Probe of Dark Matter
|
15 pages + references, 7 figures, v3: Fermi-LAT and HERD sensitivity
corrected, minor presentational improvements, matches journal version
|
Phys. Rev. D 96, 063010 (2017)
|
10.1103/PhysRevD.96.063010
|
CP3-17-08, TTK-17-07
|
astro-ph.HE hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that observations of solar $\gamma$-rays offer a novel probe of dark
matter in scenarios where interactions with the visible sector proceed via a
long-lived mediator. As a proof of principle, we demonstrate that there exists
a class of models which yield solar $\gamma$-ray fluxes observable with the
next generation of $\gamma$-ray telescopes, while being allowed by a variety of
current experimental constraints. The parameter space allowed by big bang
nucleosynthesis and beam dump experiments naturally leads to mediator lifetimes
sufficient to produce observable solar $\gamma$-ray signals. The model allows
for solar $\gamma$-ray fluxes up to orders of magnitude larger compared to
dwarf spheroidal galaxies, without reaching equilibrium between dark matter
annihilation and capture rate. Our results suggest that solar $\gamma$-ray
observations are complementary, and in some cases superior, to existing and
future dark matter detection efforts.
|
[{'version': 'v1', 'created': 'Thu, 23 Mar 2017 14:34:53 GMT'}
{'version': 'v2', 'created': 'Fri, 9 Jun 2017 14:19:39 GMT'}
{'version': 'v3', 'created': 'Wed, 20 Sep 2017 12:59:41 GMT'}]
|
2017-09-21
|
[array(['Arina', 'Chiara', ''], dtype=object)
array(['Backović', 'Mihailo', ''], dtype=object)
array(['Heisig', 'Jan', ''], dtype=object)
array(['Lucente', 'Michele', ''], dtype=object)]
|
5,854 |
1212.6727
|
Puya Sharif
|
Puya Sharif and Hoshang Heydari
|
Strategies in Symmetric Kolkata Restaurant Problem
|
5 Pages. Proceedings of QTRF 6, Quantum Theory: Reconsideration of
Foundations 6
| null |
10.1063/1.4773171
| null |
quant-ph
|
http://creativecommons.org/licenses/by/3.0/
|
The Quantum Kolkata restaurant problem is a multiple-choice version of the
quantum minority game, where a set of n non-communicating players have to chose
between one of m choices. A payoff is granted to the players that make a unique
choice. It has previously been shown that shared entanglement and quantum
operations can aid the players to coordinate their actions and acquire higher
payoffs than is possible with classical randomization. In this paper the
initial quantum state is expanded to a family of GHZ-type states and strategies
are discussed in terms of possible final outcomes. It is shown that the players
individually seek outcomes that maximize the collective good.
|
[{'version': 'v1', 'created': 'Sun, 30 Dec 2012 14:35:18 GMT'}]
|
2015-06-12
|
[array(['Sharif', 'Puya', ''], dtype=object)
array(['Heydari', 'Hoshang', ''], dtype=object)]
|
5,855 |
2110.12282
|
\c{C}a\u{g}{\i}n Ararat
|
\c{C}a\u{g}{\i}n Ararat, Francesco Cesarone, Mustafa \c{C}elebi
P{\i}nar, Jacopo Maria Ricci
|
MAD Risk Parity Portfolios
|
39 pages, 16 tables, 5 figures
| null | null | null |
q-fin.PM q-fin.RM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we investigate the features and the performance of the Risk
Parity (RP) portfolios using the Mean Absolute Deviation (MAD) as a risk
measure. The RP model is a recent strategy for asset allocation that aims at
equally sharing the global portfolio risk among all the assets of an investment
universe. We discuss here some existing and new results about the properties of
MAD that are useful for the RP approach. We propose several formulations for
finding MAD-RP portfolios computationally, and compare them in terms of
accuracy and efficiency. Furthermore, we provide extensive empirical analysis
based on five real-world datasets, showing that the performances of the RP
approaches generally tend to place both in terms of risk and profitability
between those obtained from the minimum risk and the Equally Weighted
strategies.
|
[{'version': 'v1', 'created': 'Sat, 23 Oct 2021 19:38:44 GMT'}]
|
2021-10-26
|
[array(['Ararat', 'Çağın', ''], dtype=object)
array(['Cesarone', 'Francesco', ''], dtype=object)
array(['Pınar', 'Mustafa Çelebi', ''], dtype=object)
array(['Ricci', 'Jacopo Maria', ''], dtype=object)]
|
5,856 |
0802.0472
|
Nicolas Brunner
|
Nicolas Brunner, Cyril Branciard and Nicolas Gisin
|
Can one see entanglement ?
|
5 pages, 5 figures
|
Phys. Rev. A 78, 052110 (2008)
|
10.1103/PhysRevA.78.052110
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The human eye can detect optical signals containing only a few photons. We
investigate the possibility to demonstrate entanglement with such biological
detectors. While one person could not detect entanglement by simply observing
photons, we discuss the possibility for several observers to demonstrate
entanglement in a Bell-type experiment, in which standard detectors are
replaced by human eyes. Using a toy model for biological detectors that
captures their main characteristic, namely a detection threshold, we show that
Bell inequalities can be violated, thus demonstrating entanglement. Remarkably,
when the response function of the detector is close to a step function, quantum
non-locality can be demonstrated without any further assumptions. For smoother
response functions, as for the human eye, post-selection is required.
|
[{'version': 'v1', 'created': 'Mon, 4 Feb 2008 18:34:26 GMT'}
{'version': 'v2', 'created': 'Thu, 13 Nov 2008 16:06:18 GMT'}]
|
2013-05-29
|
[array(['Brunner', 'Nicolas', ''], dtype=object)
array(['Branciard', 'Cyril', ''], dtype=object)
array(['Gisin', 'Nicolas', ''], dtype=object)]
|
5,857 |
1101.4911
|
Mete Atature
|
T. M\"uller, I. Aharonovich, L. Lombez, Y. Alaverdyan, A. N.
Vamivakas, S. Castelletto, F. Jelezko, J. Wrachtrup, S. Prawer and M.
Atat\"ure
|
Wide range electrical tunability of single photon emission from
chromium-based colour centres in diamond
| null |
New J. Phys., 13, 075001 (2011)
|
10.1088/1367-2630/13/7/075001
| null |
cond-mat.mes-hall quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate electrical control of the single photon emission spectrum from
chromium-based colour centres implanted in monolithic diamond. Under an
external electric field the tunability range is typically three orders of
magnitude larger than the radiative linewidth and at least one order of
magnitude larger than the observed linewidth. The electric and magnetic field
dependence of luminescence gives indications on the inherent symmetry and we
propose Cr-X or X-Cr-Y type noncentrosymmetric atomic configurations as most
probable candidates for these centres.
|
[{'version': 'v1', 'created': 'Tue, 25 Jan 2011 19:54:52 GMT'}]
|
2015-05-27
|
[array(['Müller', 'T.', ''], dtype=object)
array(['Aharonovich', 'I.', ''], dtype=object)
array(['Lombez', 'L.', ''], dtype=object)
array(['Alaverdyan', 'Y.', ''], dtype=object)
array(['Vamivakas', 'A. N.', ''], dtype=object)
array(['Castelletto', 'S.', ''], dtype=object)
array(['Jelezko', 'F.', ''], dtype=object)
array(['Wrachtrup', 'J.', ''], dtype=object)
array(['Prawer', 'S.', ''], dtype=object)
array(['Atatüre', 'M.', ''], dtype=object)]
|
5,858 |
1106.3868
|
Gadadhar Misra
|
Gadadhar Misra, Subrata Shyam Roy and Genkai Zhang
|
Reproducing kernel for a class of weighted Bergman spaces on the
symmetrized polydisc
| null | null | null | null |
math.FA math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A natural class of weighted Bergman spaces on the symmetrized polydisc is
isometrically embedded as a subspace in the corresponding weighted Bergman
space on the polydisc. We find an orthonormal basis for this subspace. It
enables us to compute the kernel function for the weighted Bergman spaces on
the symmetrized polydisc using the explicit nature of our embedding. This
family of kernel functions include the Szeg\"{o} and the Bergman kernel on the
symmetrized polydisc.
|
[{'version': 'v1', 'created': 'Mon, 20 Jun 2011 11:32:22 GMT'}]
|
2011-06-21
|
[array(['Misra', 'Gadadhar', ''], dtype=object)
array(['Roy', 'Subrata Shyam', ''], dtype=object)
array(['Zhang', 'Genkai', ''], dtype=object)]
|
5,859 |
hep-ph/0703223
|
Pyungwon Ko
|
P. Ko (KIAS)
|
Partially composite two Higgs doublet model
|
To appear in the proceeding of SCGT06, Nagoya, Japan
| null |
10.1142/9789812790750_0042
|
P07016
|
hep-ph
| null |
We consider a possibility that electroweak symmetry breaking (EWSB) is
triggered by a fundamental Higgs and a composite Higgs arising in a dynamical
symmetry breaking mechanism induced by a new strong dynamics. The resulting
Higgs sector is a partially composite two-Higgs doublet model with specific
boundary conditions on the coupling and mass parameters originating at a
compositeness scale. The phenomenology of this model is discussed including the
collider phenomenology at LHC and ILC.
|
[{'version': 'v1', 'created': 'Wed, 21 Mar 2007 01:11:55 GMT'}]
|
2017-08-23
|
[array(['Ko', 'P.', '', 'KIAS'], dtype=object)]
|
5,860 |
astro-ph/0508160
|
Eric Barnes
|
E.I. Barnes, L.L.R. Williams (1), A. Babul (2), J.J. Dalcanton (3)
((1) University of Minnesota, (2) University of Victoria, (3) University of
Washington)
|
Scalelengths in Dark Matter Halos
|
accepted for publication in ApJ
|
Astrophys.J.634:775-783,2005
|
10.1086/497066
| null |
astro-ph
| null |
We investigate a hypothesis regarding the origin of the scalelength in halos
formed in cosmological N-body simulations. This hypothesis can be viewed as an
extension of an earlier idea put forth by Merritt and Aguilar. Our findings
suggest that a phenomenon related to the radial orbit instability is present in
such halos and is responsible for density profile shapes. This instability sets
a scalelength at which the velocity dispersion distribution changes rapidly
from isotropic to radially anisotropic. This scalelength is reflected in the
density distribution as the radius at which the density profile changes slope.
We have tested the idea that radially dependent velocity dispersion anisotropy
leads to a break in density profile shape by manipulating the input of a
semi-analytic model to imitate the velocity structure imposed by the radial
orbit instability. Without such manipulation, halos formed are approximated by
single power-law density profiles and isotropic velocity distributions. Halos
formed with altered inputs display density distributions featuring scalelengths
and anisotropy profiles similar to those seen in cosmological N-body
simulations.
|
[{'version': 'v1', 'created': 'Fri, 5 Aug 2005 15:39:27 GMT'}]
|
2009-11-13
|
[array(['Barnes', 'E. I.', ''], dtype=object)
array(['Williams', 'L. L. R.', ''], dtype=object)
array(['Babul', 'A.', ''], dtype=object)
array(['Dalcanton', 'J. J.', ''], dtype=object)]
|
5,861 |
math/0107131
|
Tara S. Holm
|
Rebecca Goldin, Tara S. Holm
|
The equivariant cohomology of Hamiltonian $G$-spaces From Residual $S^1$
Actions
|
13 pages, 4 figures
|
Math. Res. Let. {\bf 8} (2001), 67-78
| null | null |
math.SG
| null |
We show that for a Hamiltonian action of a compact torus $G$ on a compact,
connected symplectic manifold $M$, the $G$-equivariant cohomology is determined
by the residual $S^1$ action on the submanifolds of $M$ fixed by codimension-1
tori. This theorem allows us to compute the equivariant cohomology of certain
manifolds, which have pieces that are four-dimensional or smaller. We give
several examples of the computations that this allows.
|
[{'version': 'v1', 'created': 'Wed, 18 Jul 2001 19:19:45 GMT'}]
|
2007-05-23
|
[array(['Goldin', 'Rebecca', ''], dtype=object)
array(['Holm', 'Tara S.', ''], dtype=object)]
|
5,862 |
2305.09732
|
Morgan MacLeod
|
Morgan MacLeod, Andrea Antoni, Caroline D. Huang, Andrea Dupree,
Abraham Loeb
|
Left Ringing: Betelgeuse Illuminates the Connection Between Convective
outbursts, Mode switching, and Mass Ejection in Red Supergiants
|
Submitted to AAS Journals, we welcome comments!
| null | null | null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Betelgeuse, the nearest red supergiant, dimmed to an unprecedented level in
early 2020. The star emerged from this Great Dimming episode with its typical,
roughly 400-day pulsation cycle halved, and a new dominant period of around 200
days. The dimming event has been attributed to a surface mass ejection, in
which rising material drove shocks through the stellar atmosphere and expelled
some material, partially obscuring the star as it formed molecules and dust. In
this paper, we use hydrodynamic simulations to reveal the connections between
Betelgeuse's vigorously convective envelope, the surface mass ejection, and the
pulsation mode switching that ensued. An anomalously hot convective plume,
generated rarely but naturally in the star's turbulent envelope, can rise and
break free from the surface, powering an upwelling that becomes the surface
mass ejection. The rising plume also breaks the phase coherence of the star's
pulsation, causing the surface to keep expanding even as the deeper layers
contract. This drives a switch from the 400-day fundamental mode of pulsation,
in which the whole star expands and contracts synchronously, to the 200-day
first overtone, where a radial node separates the interior and exterior of the
envelope moving in opposite phase. We predict that the star's convective
motions will damp the overtone oscillation and Betelgeuse will return to its
previous, 400-day fundamental mode pulsation in the next 5-10 years. With its
resolved surface and unprecedentedly detailed characterization, Betelgeuse
opens a window to episodic surface mass ejection in the late-stage evolution of
massive stars.
|
[{'version': 'v1', 'created': 'Tue, 16 May 2023 18:06:19 GMT'}]
|
2023-05-18
|
[array(['MacLeod', 'Morgan', ''], dtype=object)
array(['Antoni', 'Andrea', ''], dtype=object)
array(['Huang', 'Caroline D.', ''], dtype=object)
array(['Dupree', 'Andrea', ''], dtype=object)
array(['Loeb', 'Abraham', ''], dtype=object)]
|
5,863 |
1907.02117
|
Filipp Uvarov
|
V. Tarasov, F. Uvarov
|
Duality for Bethe algebras acting on polynomials in anticommuting
variables
|
21 page, 1 figure
| null |
10.1007/s11005-020-01329-2
| null |
math.QA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider actions of the current Lie algebras $\mathfrak{gl}_{n}[t]$ and
$\mathfrak{gl}_{k}[t]$ on the space of polynomials in $kn$ anticommuting
variables. The actions depend on parameters $\bar{z}=(z_{1}\dots z_{k})$ and
$\bar{\alpha}=(\alpha_{1}\dots \alpha_{n})$, respectively. We show that the
images of the Bethe algebras $\mathcal{B}_{\bar{\alpha}}^{\langle n
\rangle}\subset U(\mathfrak{gl}_{n}[t])$ and $\mathcal{B}_{\bar{z}}^{\langle k
\rangle}\subset U(\mathfrak{gl}_{k}[t])$ under these actions coincide. To prove
the statement, we use the Bethe ansatz description of eigenvalues of the
actions of the Bethe algebras via spaces of quasi-exponentials and establish an
explicit correspondence between these spaces for the actions of
$\mathcal{B}_{\bar{\alpha}}^{\langle n \rangle}$ and
$\mathcal{B}_{\bar{z}}^{\langle k \rangle}$.
|
[{'version': 'v1', 'created': 'Wed, 3 Jul 2019 20:00:17 GMT'}
{'version': 'v2', 'created': 'Fri, 21 Feb 2020 22:23:04 GMT'}]
|
2020-10-28
|
[array(['Tarasov', 'V.', ''], dtype=object)
array(['Uvarov', 'F.', ''], dtype=object)]
|
5,864 |
1812.02542
|
Rohit Gandikota
|
Rohit Gandikota
|
Computer Vision for Autonomous Vehicles
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we try to implement Image Processing techniques in the area of
autonomous vehicles, both indoor and outdoor. The challenges for both are
different and the ways to tackle them vary too. We also showed deep learning
makes things easier and precise. We also made base models for all the problems
we tackle while building an autonomous car for Indian Institute of Space
science and Technology.
|
[{'version': 'v1', 'created': 'Thu, 6 Dec 2018 14:16:56 GMT'}]
|
2018-12-07
|
[array(['Gandikota', 'Rohit', ''], dtype=object)]
|
5,865 |
cond-mat/0209389
|
Ulrich Roessler
|
U. R\"ossler
|
Optical response and spin relaxation in semiconductor systems under
excitation with arbitrary polarization
|
11 pages, no figures
|
Phys. Stat. Sol. (b) 234 (in print, 2002)
|
10.1002/1521-3951(200211)234:1<385::AID-PSSB385>3.0.CO;2-7
| null |
cond-mat
| null |
The equations-of-motion for the density matrix are derived in a multiband
model to describe the response of semiconductors (bulk or quantum well
structures) under optical excitation with arbitrary polarization. The multiband
model used, comprising the twofold conduction band and the fourfold topmost
valence band (or heavy- and light-hole states), incorporates spin-splitting of
the single-particle states. The interaction terms include besides the direct
Coulomb coupling between carriers also the electron-hole exchange interaction,
which together with the spin-splitting terms is responsible for spin
relaxation. Applying the Hartree-Fock truncation scheme leads to a set of
coherent semiconductor Bloch equations for the multiband case. This concept
provides the theoretical frame for describing phenomena connected with optical
response under excitation with arbitrary light polarization and spin
relaxation: polarized optical response, polarization dynamics of VCSELs, spin
relaxation, and the circular photovoltaic effect.
|
[{'version': 'v1', 'created': 'Tue, 17 Sep 2002 12:38:53 GMT'}]
|
2016-08-16
|
[array(['Rössler', 'U.', ''], dtype=object)]
|
5,866 |
2304.05137
|
Markus Buehler
|
Wei Lu, Nic A. Lee, Markus J. Buehler
|
Modeling and design of heterogeneous hierarchical bioinspired spider web
structures using generative deep learning and additive manufacturing
| null | null | null | null |
cs.LG cond-mat.soft nlin.AO
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Spider webs are incredible biological structures, comprising thin but strong
silk filament and arranged into complex hierarchical architectures with
striking mechanical properties (e.g., lightweight but high strength, achieving
diverse mechanical responses). While simple 2D orb webs can easily be mimicked,
the modeling and synthesis of 3D-based web structures remain challenging,
partly due to the rich set of design features. Here we provide a detailed
analysis of the heterogenous graph structures of spider webs, and use deep
learning as a way to model and then synthesize artificial, bio-inspired 3D web
structures. The generative AI models are conditioned based on key geometric
parameters (including average edge length, number of nodes, average node
degree, and others). To identify graph construction principles, we use
inductive representation sampling of large experimentally determined spider web
graphs, to yield a dataset that is used to train three conditional generative
models: 1) An analog diffusion model inspired by nonequilibrium thermodynamics,
with sparse neighbor representation, 2) a discrete diffusion model with full
neighbor representation, and 3) an autoregressive transformer architecture with
full neighbor representation. All three models are scalable, produce complex,
de novo bio-inspired spider web mimics, and successfully construct graphs that
meet the design objectives. We further propose algorithm that assembles web
samples produced by the generative models into larger-scale structures based on
a series of geometric design targets, including helical and parametric shapes,
mimicking, and extending natural design principles towards integration with
diverging engineering objectives. Several webs are manufactured using 3D
printing and tested to assess mechanical properties.
|
[{'version': 'v1', 'created': 'Tue, 11 Apr 2023 11:03:27 GMT'}]
|
2023-04-12
|
[array(['Lu', 'Wei', ''], dtype=object)
array(['Lee', 'Nic A.', ''], dtype=object)
array(['Buehler', 'Markus J.', ''], dtype=object)]
|
5,867 |
1907.11653
|
Jesus L. Lobo
|
Jesus L. Lobo, Igor Ballesteros, Izaskun Oregi, Javier Del Ser
|
Real-time Electrical Power Prediction in a Combined Cycle Power Plant
| null |
Till under revision in Engineering Applications of Artificial
Intelligence journal un 2019
| null | null |
eess.SP cs.SY eess.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The prediction of electrical power in combined cycle power plants is a key
challenge in the electrical power and energy systems field. This power output
can vary depending on environmental variables, such as temperature, pressure,
and humidity. Thus, the business problem is how to predict the power output as
a function of these environmental conditions in order to maximize the profit.
The research community has solved this problem by applying machine learning
techniques and has managed to reduce the computational and time costs in
comparison with the traditional thermodynamical analysis. Until now, this
challenge has been tackled from a batch learning perspective in which data is
assumed to be at rest, and where models do not continuously integrate new
information into already constructed models. We present an approach closer to
the Big Data and Internet of Things paradigms in which data is arriving
continuously and where models learn incrementally, achieving significant
enhancements in terms of data processing (time, memory and computational
costs), and obtaining competitive performances. This work compares and examines
the hourly electrical power prediction of several streaming regressors, and
discusses about the best technique in terms of time processing and performance
to be applied on this streaming scenario.
|
[{'version': 'v1', 'created': 'Mon, 22 Jul 2019 10:34:23 GMT'}]
|
2019-08-06
|
[array(['Lobo', 'Jesus L.', ''], dtype=object)
array(['Ballesteros', 'Igor', ''], dtype=object)
array(['Oregi', 'Izaskun', ''], dtype=object)
array(['Del Ser', 'Javier', ''], dtype=object)]
|
5,868 |
gr-qc/9703015
|
Markus Heusler
|
Markus Heusler
|
Mass formulae for a class of nonrotating black holes
|
18 pages, revtex, no figures
| null |
10.1103/PhysRevD.56.961
|
ZU-TH 6/97
|
gr-qc
| null |
In the presence of a Killing symmetry, various self-gravitating field
theories with massless scalars (moduli) and vector fields reduce to
sigma-models, effectively coupled to 3-dimensional gravity. We argue that this
particular structure of the Einstein-matter equations gives rise to quadratic
relations between the asymptotic flux integrals and the area and surface
gravity (Hawking temperature) of the horizon. The method is first illustrated
for the Einstein-Maxwell system. A derivation of the quadratic formula is then
also presented for the Einstein-Maxwell-axion-dilaton model, which is relevant
to the bosonic sector of heterotic string theory.
|
[{'version': 'v1', 'created': 'Thu, 6 Mar 1997 13:55:54 GMT'}]
|
2016-08-31
|
[array(['Heusler', 'Markus', ''], dtype=object)]
|
5,869 |
1407.0421
|
Blake Winter
|
Blake Winter
|
Virtual, Welded, and Ribbon Links in Arbitrary Dimensions
|
Submitted as part of the requirements for ph.D. at SUNY Buffalo
| null | null | null |
math.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We define a generalization of virtual links to arbitrary dimensions by
extending the geometric definition due to Carter et al. We show that many
homotopy type invariants for classical links extend to invariants of virtual
links. We also define generalizations of virtual link diagrams and Gauss codes
to represent virtual links, and use such diagrams to construct a combinatorial
biquandle invariant for virtual $2$-links. In the case of $2$-links, we also
explore generalizations of Fox-Milnor movies to the virtual case. In addition,
we discuss definitions extending the notion of welded links to higher
dimensions. For ribbon knots in dimension $4$ or greater, we show that the knot
quandle is a complete classifying invariant up to taking connected sums with a
trivially knotted $S^1\times S^{n-1}$, and that all the isotopies involved may
be taken to be generated by stable equivalences of ribbon knots.
|
[{'version': 'v1', 'created': 'Tue, 1 Jul 2014 22:48:04 GMT'}]
|
2014-07-03
|
[array(['Winter', 'Blake', ''], dtype=object)]
|
5,870 |
2009.09372
|
Prasanna Raj Noel Dabre
|
Raj Dabre and Atsushi Fujita
|
Softmax Tempering for Training Neural Machine Translation Models
|
The paper is about prediction smoothing for improving sequence to
sequence performance. Related to but not the same as label smoothing. Work in
progress. Updates with deeper analyses and comparisons to related methods to
follow. Rejected from EMNLP 2020
| null | null | null |
cs.CL cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neural machine translation (NMT) models are typically trained using a softmax
cross-entropy loss where the softmax distribution is compared against smoothed
gold labels. In low-resource scenarios, NMT models tend to over-fit because the
softmax distribution quickly approaches the gold label distribution. To address
this issue, we propose to divide the logits by a temperature coefficient, prior
to applying softmax, during training. In our experiments on 11 language pairs
in the Asian Language Treebank dataset and the WMT 2019 English-to-German
translation task, we observed significant improvements in translation quality
by up to 3.9 BLEU points. Furthermore, softmax tempering makes the greedy
search to be as good as beam search decoding in terms of translation quality,
enabling 1.5 to 3.5 times speed-up. We also study the impact of softmax
tempering on multilingual NMT and recurrently stacked NMT, both of which aim to
reduce the NMT model size by parameter sharing thereby verifying the utility of
temperature in developing compact NMT models. Finally, an analysis of softmax
entropies and gradients reveal the impact of our method on the internal
behavior of NMT models.
|
[{'version': 'v1', 'created': 'Sun, 20 Sep 2020 07:06:22 GMT'}]
|
2020-09-22
|
[array(['Dabre', 'Raj', ''], dtype=object)
array(['Fujita', 'Atsushi', ''], dtype=object)]
|
5,871 |
astro-ph/9903472
|
S. L. Bridle
|
S.L. Bridle, V.R. Eke, O. Lahav, A.N. Lasenby, M.P. Hobson, S. Cole,
C.S. Frenk and J.P. Henry
|
Cosmological parameters from cluster abundances, CMB and IRAS
|
6 pages, 4 figures. Submitted to MNRAS
| null |
10.1046/j.1365-8711.1999.02960.x
| null |
astro-ph
| null |
We combine information on cosmological parameters from cluster abundances,
CMB primordial anisotropies and the IRAS 1.2 Jy galaxy redshift survey. We take
as free parameters the present values of the total matter density of the
universe, Omega_m, the Hubble parameter, h, sigma_8, and the IRAS biasing
factor, b_IRAS. We assume that the universe is spatially flat, with a
cosmological constant, and that structure formed from adiabatic initial
fluctuations with a Harrison-Zel'dovich power spectrum. The nucleosynthesis
value Omega_b=0.019/h^2 is adopted. We use the full three- and four-
dimensional likelihood functions for each data set and marginalise these to
two- and one- dimensional distributions in a Bayesian way, integrating over the
other parameters. It is shown that the three data sets are in excellent
agreement, with a best fit point of Omega_m= 1-Omega_Lambda=0.36, h=0.54,
sigma_8=0.74, and b_IRAS=1.08. This point is within one sigma of the minimum
for each data set alone. Pairs of these data sets have their degeneracies in
sufficiently different directions that using only two data sets at a time is
sufficient to place good constraints on the cosmological parameters. We show
that the results from each of the three possible pairings of the data are also
in good agreement. Finally, we combine all three data sets to obtain
marginalised 68 per cent confidence intervals of 0.30<Omega_m<0.43,
0.48<h<0.59, 0.69<sigma_8<0.79, and 1.01<b_IRAS<1.16. For the best fit
parameters the CMB quadrupole is Q_rms-ps=18.0 uK, Gamma=0.15, Omega_b=0.066
and the age of the universe is 16.7 Gyr.
|
[{'version': 'v1', 'created': 'Wed, 31 Mar 1999 10:31:45 GMT'}]
|
2009-10-31
|
[array(['Bridle', 'S. L.', ''], dtype=object)
array(['Eke', 'V. R.', ''], dtype=object)
array(['Lahav', 'O.', ''], dtype=object)
array(['Lasenby', 'A. N.', ''], dtype=object)
array(['Hobson', 'M. P.', ''], dtype=object)
array(['Cole', 'S.', ''], dtype=object)
array(['Frenk', 'C. S.', ''], dtype=object)
array(['Henry', 'J. P.', ''], dtype=object)]
|
5,872 |
0901.3514
|
Stephen Skinner
|
S.L. Skinner, K.R. Sokal, M. Gudel, K.R. Briggs
|
X-ray Emission from the FU Orionis Star V1735 Cygni
|
25 pages, 6 figures
|
Astrophys.J.696:766-774,2009
|
10.1088/0004-637X/696/1/766
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The variable star V1735 Cyg (= Elias 1-12) lies in the IC 5146 dark cloud and
is a member of the class of FU Orionis objects whose dramatic optical
brightenings are thought to be linked to episodic accretion. We report the
first X-ray detections of V1735 Cyg and a deeply-embedded class I protostar
lying 24 arcsecs to its northeast. X-ray spectra obtained with EPIC on
XMM-Newton reveal very high-temperature plasma (kT > 5 keV) in both objects,
but no large flares. Such hard X-ray emission is not anticipated from accretion
shocks and is a signature of magnetic processes. We place these new results
into the context of what is presently known about the X-ray properties of FU
Orionis stars and other accreting young stellar objects.
|
[{'version': 'v1', 'created': 'Thu, 22 Jan 2009 16:51:38 GMT'}]
|
2011-02-11
|
[array(['Skinner', 'S. L.', ''], dtype=object)
array(['Sokal', 'K. R.', ''], dtype=object)
array(['Gudel', 'M.', ''], dtype=object)
array(['Briggs', 'K. R.', ''], dtype=object)]
|
5,873 |
1406.3265
|
Munir Al-Hashimi
|
M. H. Al-Hashimi and Abouzeid M. Shalaby
|
A Solution of the Relativistic Schr\"odinger Equation for the
$\delta$-Function Potential in 1-dimensiona with Cutoff Regularization
|
11 pages, 2 figures
| null | null | null |
hep-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the solution of the relativistic Schr\"odinger equation for a point
particle in 1-d under $\delta$-function potential by using cutoff
regularization. We show that the problem is renormalizable, and the results are
exactly the same as the ones obtained using dimensional regularization.
|
[{'version': 'v1', 'created': 'Thu, 12 Jun 2014 15:30:57 GMT'}
{'version': 'v2', 'created': 'Sat, 21 Jun 2014 02:32:47 GMT'}]
|
2014-06-24
|
[array(['Al-Hashimi', 'M. H.', ''], dtype=object)
array(['Shalaby', 'Abouzeid M.', ''], dtype=object)]
|
5,874 |
2307.02372
|
Wei Liu
|
Dong-Xu Sun, Pei-Pei Zhang, Yi-Qing Guo, Wei Liu, and Qiang Yuan
|
Multi-messenger observations support cosmic ray interactions surrounding
acceleration sources
|
10 papes, 5 pages
| null | null | null |
astro-ph.HE
|
http://creativecommons.org/licenses/by/4.0/
|
The observations of the energy spectra of cosmic-ray have revealed
complicated structures. Especially, spectral hardenings in the boron-to-carbon
and boron-to-oxygen ratios above $\sim 200$ GV has been revealed by AMS-02 and
DAMPE experiments. One scenario to account for the hardenings of
secondary-to-primary ratios is the nuclear fragmentation of freshly accelerated
particles around sources. In this work, we further study this scenario based on
new observations of Galactic diffuse gamma rays by LHAASO and neutrinos by
IceCube. We find that the spectra of cosmic ray nuclei, the diffuse
ultra-high-energy gamma rays, and the Galactic component of neutrinos can be
simultaneously explained, given an average confinement and interaction time of
$\sim 0.25$ Myr around sources. These multi-messenger data thus provide
evidence of non-negligible grammage of Galactic cosmic rays surrounding sources
besides the traditional one during the propagation.
|
[{'version': 'v1', 'created': 'Wed, 5 Jul 2023 15:39:40 GMT'}]
|
2023-07-06
|
[array(['Sun', 'Dong-Xu', ''], dtype=object)
array(['Zhang', 'Pei-Pei', ''], dtype=object)
array(['Guo', 'Yi-Qing', ''], dtype=object)
array(['Liu', 'Wei', ''], dtype=object)
array(['Yuan', 'Qiang', ''], dtype=object)]
|
5,875 |
1204.1652
|
Aleksey Polubotko
|
A. M. Polubotko
|
Dipole-Quadrupole Theory of Surface Enhanced Infrared Absorption and
Appearance of Forbidden Lines in the SEIRA Spectra of Symmetrical Molecules
|
15 pages,3 figures, 1 table
| null |
10.1134/S0030400X13050147
| null |
physics.optics physics.chem-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper presents main aspects of the Dipole-Quadrupole theory of Surface
Enhanced Infrared Absorption (SEIRA). It is pointed out the possibility of
appearance of the lines, caused by totally symmetric vibrations transforming
after the unit irreducible representation, which are forbidden in usual
infrared absorption spectra in molecules with sufficiently high symmetry.
Observation of such lines in the SEIRA spectra of diprotonated and ethylene,
adsorbed on and on mordenites is pointed out. The results well agree with our
ideas about surface enhanced optical processes, based on the conception of a
strong quadrupole light-molecule interaction, which allows us to develop the
SERS and SEHRS theories.
|
[{'version': 'v1', 'created': 'Sat, 7 Apr 2012 16:07:17 GMT'}]
|
2015-06-04
|
[array(['Polubotko', 'A. M.', ''], dtype=object)]
|
5,876 |
1010.3291
|
Mats Holmstrom
|
M. Holmstrom
|
An Energy Conserving Parallel Hybrid Plasma Solver
|
Submitted to the Proceedings of ASTRONUM-2010
|
ASP Conference Series, vol. 444, 211-216, 2011
| null | null |
physics.space-ph physics.comp-ph physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the performance of a hybrid plasma solver on the test problem
of an ion beam. The parallel solver is based on cell centered finite
differences in space, and a predictor-corrector leapfrog scheme in time. The
implementation is done in the FLASH software framework. It is shown that the
solver conserves energy well over time, and that the parallelization is
efficient (it exhibits weak scaling).
|
[{'version': 'v1', 'created': 'Fri, 15 Oct 2010 22:49:33 GMT'}
{'version': 'v2', 'created': 'Thu, 2 Dec 2010 22:39:35 GMT'}]
|
2011-09-15
|
[array(['Holmstrom', 'M.', ''], dtype=object)]
|
5,877 |
2211.09486
|
Margarira Akhmejanova
|
Margarita Akhmejanova, Ilya Bogdanov, Grigory Chelnokov
|
The continualization approach to the on-line hypergraph coloring
| null | null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper deals with an algorithmic problem concerning combinatorial game
theory. Here we introduce and analyze a continuous generalization of Chip Game
from the work of Duraj, Gutowski and Kozik. The general Chip game was
introduced by Aslam and Dhagat to model on-line type problems on hypergraph
coloring.
|
[{'version': 'v1', 'created': 'Thu, 17 Nov 2022 12:06:29 GMT'}
{'version': 'v2', 'created': 'Fri, 18 Nov 2022 09:13:51 GMT'}]
|
2022-11-21
|
[array(['Akhmejanova', 'Margarita', ''], dtype=object)
array(['Bogdanov', 'Ilya', ''], dtype=object)
array(['Chelnokov', 'Grigory', ''], dtype=object)]
|
5,878 |
2201.03434
|
Marta De Simone
|
Marta De Simone, Claudio Codella, Cecilia Ceccarelli, Ana
L\'opez-Sepulcre, Roberto Neri, Pedro Ruben Rivera-Ortiz, Gemma Busquet,
Paola Caselli, Eleonora Bianchi, Francesco Fontani, Bertrand Lefloch, Yoko
Oya, and Jaime E. Pineda
|
A train of shocks at 3000 au scale? Exploring the clash of an expanding
bubble into the NGC 1333 IRAS 4 region. SOLIS XIV
|
accepted to MNRAS, stac083
| null |
10.1093/mnras/stac083
| null |
astro-ph.GA astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There is evidence that the star formation process is linked to the intricate
net of filaments in molecular clouds, which may be also due to gas compression
from external triggers. We studied the southern region of the Perseus NGC 1333
molecular cloud, known to be heavily shaped by similar external triggers, to
shed light on the process that perturbed the filament where the Class 0 IRAS4
protostars lie. We use new IRAM-NOEMA observations of SiO and CH3OH, both known
to trace violent events as shocks, toward IRAS 4A as part of the Large Program
Seeds Of Life in Space (SOLIS). We detected three parallel elongated ($>$6000
au) structures, called fingers, with narrow line profiles (~1.5 $km s^{-1}$)
peaked at the cloud systemic velocity, tracing gas with high density (5-20
$10^5 cm^{-3}$) and high temperature (80-160 K). They are chemically different,
with the northern finger traced by both SiO and CH3OH ([CH3OH]/[SiO]~160-300),
while the other two only by SiO ([CH3OH]/[SiO]$<$ 40). Among various
possibilities, a train of three shocks, distanced by $>$5000 yr, would be
consistent with the observations if a substantial fraction of silicon, frozen
onto the grain mantles, is released by the shocks.We suggest that the shock
train is due to an expanding gas bubble, coming behind NGC 1333 from the
southwest and clashing against the filament, where IRAS 4A lies. Finally, we
propose a solution to the two-decades long debate on the nature and origin of
the widespread narrow SiO emission observed in the south part of NGC 1333,
namely that it is due to unresolved trains of shocks.
|
[{'version': 'v1', 'created': 'Mon, 10 Jan 2022 16:23:31 GMT'}
{'version': 'v2', 'created': 'Fri, 18 Feb 2022 12:26:09 GMT'}]
|
2022-02-21
|
[array(['De Simone', 'Marta', ''], dtype=object)
array(['Codella', 'Claudio', ''], dtype=object)
array(['Ceccarelli', 'Cecilia', ''], dtype=object)
array(['López-Sepulcre', 'Ana', ''], dtype=object)
array(['Neri', 'Roberto', ''], dtype=object)
array(['Rivera-Ortiz', 'Pedro Ruben', ''], dtype=object)
array(['Busquet', 'Gemma', ''], dtype=object)
array(['Caselli', 'Paola', ''], dtype=object)
array(['Bianchi', 'Eleonora', ''], dtype=object)
array(['Fontani', 'Francesco', ''], dtype=object)
array(['Lefloch', 'Bertrand', ''], dtype=object)
array(['Oya', 'Yoko', ''], dtype=object)
array(['Pineda', 'Jaime E.', ''], dtype=object)]
|
5,879 |
1007.4980
|
Eleftherios Nikolidakis
|
Eleftherios Nikolidakis
|
Sharp weak type inequalities for the dyadic maximal operator
|
27 pages
| null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We obtain sharp estimates for the localized distribution function of M\phi,
when \phi belongs to Lp,\inf where M is the dyadic maximal operator. We obtain
these estimates given the L1 and Lq norm, q < p and certain weak Lp-conditions.
|
[{'version': 'v1', 'created': 'Wed, 28 Jul 2010 13:56:05 GMT'}
{'version': 'v2', 'created': 'Sun, 20 Jan 2013 05:46:02 GMT'}
{'version': 'v3', 'created': 'Sun, 30 Mar 2014 10:13:59 GMT'}]
|
2014-04-01
|
[array(['Nikolidakis', 'Eleftherios', ''], dtype=object)]
|
5,880 |
1503.08019
|
Mohamad Kazem Shirani Faradonbeh
|
Mohamad Kazem Shirani Faradonbeh, Ambuj Tewari, George Michailidis
|
Optimality of Fast Matching Algorithms for Random Networks with
Applications to Structural Controllability
| null | null | null | null |
cs.DS cs.SY stat.OT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Network control refers to a very large and diverse set of problems including
controllability of linear time-invariant dynamical systems, where the objective
is to select an appropriate input to steer the network to a desired state.
There are many notions of controllability, one of them being structural
controllability, which is intimately connected to finding maximum matchings on
the underlying network topology. In this work, we study fast, scalable
algorithms for finding maximum matchings for a large class of random networks.
First, we illustrate that degree distribution random networks are realistic
models for real networks in terms of structural controllability. Subsequently,
we analyze a popular, fast and practical heuristic due to Karp and Sipser as
well as a simplification of it. For both heuristics, we establish asymptotic
optimality and provide results concerning the asymptotic size of maximum
matchings for an extensive class of random networks.
|
[{'version': 'v1', 'created': 'Fri, 27 Mar 2015 10:52:40 GMT'}
{'version': 'v2', 'created': 'Thu, 24 Mar 2016 04:37:16 GMT'}]
|
2016-03-25
|
[array(['Faradonbeh', 'Mohamad Kazem Shirani', ''], dtype=object)
array(['Tewari', 'Ambuj', ''], dtype=object)
array(['Michailidis', 'George', ''], dtype=object)]
|
5,881 |
0902.1888
|
Edan Lerner
|
Edan Lerner, Itamar Procaccia and Jacques Zylberg
|
Statistical Mechanics and Dynamics of a 3-Dimensional Glass-Forming
System
|
4 pages, 6 figures
| null |
10.1103/PhysRevLett.102.125701
| null |
cond-mat.stat-mech cond-mat.dis-nn cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of a classical example of glass-formation in 3-dimensions we
exemplify how to construct a statistical mechanical theory of the glass
transition. At the heart of the approach is a simple criterion for verifying a
proper choice of up-scaled quasi-species that allow the construction of a
theory with a finite number of 'states'. Once constructed, the theory
identifies a typical scale $\xi$ that increases rapidly with lowering the
temperature and which determines the $\alpha$-relaxation time $\tau_\alpha$ as
$\tau_\alpha \sim \exp(\mu\xi/T)$ with $\mu$ a typical chemical potential. The
theory can predict relaxation times at temperatures that are inaccessible to
numerical simulations.
|
[{'version': 'v1', 'created': 'Wed, 11 Feb 2009 13:31:58 GMT'}]
|
2009-11-13
|
[array(['Lerner', 'Edan', ''], dtype=object)
array(['Procaccia', 'Itamar', ''], dtype=object)
array(['Zylberg', 'Jacques', ''], dtype=object)]
|
5,882 |
physics/0406146
|
Edward Startsev A.
|
Edward A. Startsev and Ronald C. Davidson
|
Analytical Solutions for the Nonlinear Longitudinal Drift Compression
(Expansion) of Intense Charged Particle Beams
| null |
New J.Phys. 6 (2004) 141
|
10.1088/1367-2630/6/1/141
| null |
physics.acc-ph physics.plasm-ph
| null |
To achieve high focal spot intensities in heavy ion fusion, the ion beam must
be compressed longitudinally by factors of ten to one hundred before it is
focused onto the target. The longitudinal compression is achieved by imposing
an initial velocity profile tilt on the drifting beam. In this paper, the
problem of longitudinal drift compression of intense charged particle beams is
solved analytically for the two important cases corresponding to a cold beam,
and a pressure-dominated beam, using a one-dimensional warm-fluid model
describing the longitudinal beam dynamics.
|
[{'version': 'v1', 'created': 'Tue, 29 Jun 2004 03:42:28 GMT'}]
|
2009-11-10
|
[array(['Startsev', 'Edward A.', ''], dtype=object)
array(['Davidson', 'Ronald C.', ''], dtype=object)]
|
5,883 |
0903.4091
|
Niels Leth Gammelgaard
|
J{\o}rgen Ellegaard Andersen and Niels Leth Gammelgaard
|
Hitchin's Projectively Flat Connection, Toeplitz Operators and the
Asymptotic Expansion of TQFT Curve Operators
|
24 pages
|
Grassmannians, moduli spaces and vector bundles, 1-24, Clay Math.
Proc., 14, Amer. Math. Soc., Providence, RI, 2011
| null | null |
math.DG math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we will provide a review of the geometric construction,
proposed by Witten, of the SU(n) quantum representations of the mapping class
groups which are part of the Reshetikhin-Turaev TQFT for the quantum group
U_q(sl(n, C)). In particular, we recall the differential geometric construction
of Hitchin's projectively flat connection in the bundle over Teichmuller space
obtained by push-forward of the determinant line bundle over the moduli space
of rank n, fixed determinant, semi-stable bundles fibering over Teichmuller
space. We recall the relation between the Hitchin connection and Toeplitz
operators which was first used by the first named author to prove the
asymptotic faithfulness of the SU(n) quantum representations of the mapping
class groups. We further review the construction of the formal Hitchin
connection, and we discuss its relation to the full asymptotic expansion of the
curve operators of Topological Quantum Field Theory. We then go on to
identifying the first terms in the formal parallel transport of the Hitchin
connection explicitly. This allows us to identify the first terms in the
resulting star product on functions on the moduli space. This is seen to agree
with the first term in the star product on holonomy functions on these moduli
spaces defined by Andersen, Mattes and Reshetikhin.
|
[{'version': 'v1', 'created': 'Tue, 24 Mar 2009 14:37:34 GMT'}]
|
2014-08-21
|
[array(['Andersen', 'Jørgen Ellegaard', ''], dtype=object)
array(['Gammelgaard', 'Niels Leth', ''], dtype=object)]
|
5,884 |
1103.2031
|
Liang Liu
|
Liu Liang, Qian Shengbang, Zhu Liying, He Jiajia, Yuan Jinzhao, Dai
Zhibin, Liao Wenping and Zhao Jia
|
CCD photometric study of the W UMa-type binary II CMa in the field of
Berkeley 33
| null |
PASJ: Publ. Astron. Soc. Japan 60, 565-570, 2008 June 25
|
10.1093/pasj/60.3.565
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The CCD photometric data of the EW-type binary, II CMa, which is a contact
star in the field of the middle-aged open cluster Berkeley 33, are presented.
The complete R light curve was obtained. In the present paper, using the five
CCD epochs of light minimum (three of them are calculated from Mazur et al.
(1993)'s data and two from our new data), the orbital period P was revised to
0.22919704 days. The complete R light curve was analyzed by using the 2003
version of W-D (Wilson-Devinney) program. It is found that this is a contact
system with a mass ratio $q=0.9$ and a contact factor $f=4.1%$. The high mass
ratio ($q=0.9$) and the low contact factor ($f=4.1%$) indicate that the system
just evolved into the marginal contact stage.
|
[{'version': 'v1', 'created': 'Thu, 10 Mar 2011 13:33:45 GMT'}]
|
2015-05-27
|
[array(['Liang', 'Liu', ''], dtype=object)
array(['Shengbang', 'Qian', ''], dtype=object)
array(['Liying', 'Zhu', ''], dtype=object)
array(['Jiajia', 'He', ''], dtype=object)
array(['Jinzhao', 'Yuan', ''], dtype=object)
array(['Zhibin', 'Dai', ''], dtype=object)
array(['Wenping', 'Liao', ''], dtype=object)
array(['Jia', 'Zhao', ''], dtype=object)]
|
5,885 |
2103.01314
|
Kevin Zhao
|
Kevin Zhao, Prateesh Goyal, Mohammad Alizadeh, Thomas E. Anderson
|
SWP: Microsecond Network SLOs Without Priorities
| null | null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The increasing use of cloud computing for latency-sensitive applications has
sparked renewed interest in providing tight bounds on network tail latency.
Achieving this in practice at reasonable network utilization has proved
elusive, due to a combination of highly bursty application demand, faster link
speeds, and heavy-tailed message sizes. While priority scheduling can be used
to reduce tail latency for some traffic, this comes at a cost of much worse
delay behavior for all other traffic on the network. Most operators choose to
run their networks at very low average utilization, despite the added cost, and
yet still suffer poor tail behavior.
This paper takes a different approach. We build a system, swp, to help
operators (and network designers) to understand and control tail latency
without relying on priority scheduling. As network workload changes, swp is
designed to give real-time advice on the network switch configurations needed
to maintain tail latency objectives for each traffic class. The core of swp is
an efficient model for simulating the combined effect of traffic
characteristics, end-to-end congestion control, and switch scheduling on
service-level objectives (SLOs), along with an optimizer that adjusts
switch-level scheduling weights assigned to each class. Using simulation across
a diverse set of workloads with different SLOs, we show that to meet the same
SLOs as swp provides, FIFO would require 65% greater link capacity, and 79%
more for scenarios with tight SLOs on bursty traffic classes.
|
[{'version': 'v1', 'created': 'Mon, 1 Mar 2021 21:10:52 GMT'}
{'version': 'v2', 'created': 'Wed, 3 Mar 2021 02:33:17 GMT'}]
|
2021-03-04
|
[array(['Zhao', 'Kevin', ''], dtype=object)
array(['Goyal', 'Prateesh', ''], dtype=object)
array(['Alizadeh', 'Mohammad', ''], dtype=object)
array(['Anderson', 'Thomas E.', ''], dtype=object)]
|
5,886 |
1701.01256
|
Wojciech Szewczuk Dr.
|
Wojciech Szewczuk, Jadwiga Daszy\'nska-Daszkiewicz, Przemys{\l}aw
Walczak
|
Deciphering the period spacing pattern in the oscillation spectrum of
the SPB star KIC 7760680
|
proceedings of the Joint TASC2 - KASC9 Workshop - SPACEINN - HELAS8
Conference "Seismology of the Sun and the Distant Stars 2016", to be
published by the EPJ Web of Conferences
| null |
10.1051/epjconf/201716003012
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the analysis of KIC 7760680, the rotating Slowly Pulsating B-type
star identified in the Kepler photometry. The oscillation spectrum of the star
exhibits a series of 36 frequencies which are quasi-equally spaced in period.
We confirm that this series can be associated with prograde dipole modes of
consecutive radial orders. In our studies, the effects of rotation were
included in the MESA equilibrium models as well as in the puslational
calculations in the framework of the traditional approximation. We find that
pulsational models computed with the OPLIB opacities best reproduce the
observed frequency range. The modified opacity data with an enhancement of the
opacity at $\log T=5.3$, 5.46 and 5.06 were tested as well. Increasing the
OPLIB opacities by about 50% at $\log T=5.3$ is sufficient to excite modes in
the whole range of 36 frequency peaks of KIC 7760680.
|
[{'version': 'v1', 'created': 'Thu, 5 Jan 2017 09:21:15 GMT'}]
|
2017-11-08
|
[array(['Szewczuk', 'Wojciech', ''], dtype=object)
array(['Daszyńska-Daszkiewicz', 'Jadwiga', ''], dtype=object)
array(['Walczak', 'Przemysław', ''], dtype=object)]
|
5,887 |
1005.0552
|
Jaime Alvarez-Muniz
|
Jaime Alvarez-Muniz, Washington R. Carvalho Jr., Matias Tueros,
Enrique Zas
|
Coherent Cherenkov radio pulses from hadronic showers up to EeV energies
|
Replaced with version published in Astroparticle Physics
|
Astroparticle Physics 35 (2012) 287-299
|
10.1016/j.astropartphys.2011.10.002
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Cherenkov radio pulse emitted by hadronic showers in ice is calculated
for showers of energies in the EeV range. This is obtained with three
dimensional simulations of both shower development and the coherent radio pulse
emitted as the excess charge develops in the shower. A Monte Carlo, ZHAireS,
has been developed for this purpose combining the high energy hadronic
interaction capabilities of AIRES, and the dense media propagation capabilities
of TIERRAS, with the precise low energy tracking and specific algorithms
developed to calculate the radio emission in ZHS. A thinning technique is
implemented and optimized to allow the simulation of radio pulses induced by
showers up to 10 EeV in ice. The code is validated comparing the results for
electromagnetic and hadronic showers to those obtained with GEANT4 and ZHS
codes. The contribution to the pulse of other shower particles in addition to
electrons and positrons, mainly pions and muons, is found to be below 1%. The
characteristics of hadronic showers and the corresponding Cherenkov frequency
spectra are compared with those from purely electromagnetic showers. The
dependence of the spectra on shower energy and high-energy hadronic model is
addressed and parameterizations for the radio emission in hadronic showers in
ice are given for practical applications.
|
[{'version': 'v1', 'created': 'Tue, 4 May 2010 15:17:36 GMT'}
{'version': 'v2', 'created': 'Mon, 16 Apr 2012 11:44:25 GMT'}]
|
2012-04-17
|
[array(['Alvarez-Muniz', 'Jaime', ''], dtype=object)
array(['Carvalho', 'Washington R.', 'Jr.'], dtype=object)
array(['Tueros', 'Matias', ''], dtype=object)
array(['Zas', 'Enrique', ''], dtype=object)]
|
5,888 |
2305.18400
|
Xiaojin Zhang
|
Xiaojin Zhang, Yan Kang, Lixin Fan, Kai Chen, Qiang Yang
|
A Meta-learning Framework for Tuning Parameters of Protection Mechanisms
in Trustworthy Federated Learning
| null | null | null | null |
cs.LG cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Trustworthy Federated Learning (TFL) typically leverages protection
mechanisms to guarantee privacy. However, protection mechanisms inevitably
introduce utility loss or efficiency reduction while protecting data privacy.
Therefore, protection mechanisms and their parameters should be carefully
chosen to strike an optimal tradeoff between \textit{privacy leakage},
\textit{utility loss}, and \textit{efficiency reduction}. To this end,
federated learning practitioners need tools to measure the three factors and
optimize the tradeoff between them to choose the protection mechanism that is
most appropriate to the application at hand. Motivated by this requirement, we
propose a framework that (1) formulates TFL as a problem of finding a
protection mechanism to optimize the tradeoff between privacy leakage, utility
loss, and efficiency reduction and (2) formally defines bounded measurements of
the three factors. We then propose a meta-learning algorithm to approximate
this optimization problem and find optimal protection parameters for
representative protection mechanisms, including Randomization, Homomorphic
Encryption, Secret Sharing, and Compression. We further design estimation
algorithms to quantify these found optimal protection parameters in a practical
horizontal federated learning setting and provide a theoretical analysis of the
estimation error.
|
[{'version': 'v1', 'created': 'Sun, 28 May 2023 15:01:18 GMT'}
{'version': 'v2', 'created': 'Thu, 1 Jun 2023 13:28:22 GMT'}]
|
2023-06-06
|
[array(['Zhang', 'Xiaojin', ''], dtype=object)
array(['Kang', 'Yan', ''], dtype=object)
array(['Fan', 'Lixin', ''], dtype=object)
array(['Chen', 'Kai', ''], dtype=object)
array(['Yang', 'Qiang', ''], dtype=object)]
|
5,889 |
1708.09062
|
Nurit Avraham
|
Nurit Avraham, Andrew Norris, Yan Sun, Yanpeng Qi, Lin Pan, Anna
Isaeva, Alexander Zeugner, Claudia Felser, Binghai Yan and Haim Beidenkopf
|
Coexisting surface states in the weak and crystalline topological
insulator Bi_2TeI
|
18 pages, 4 figures; Data added, presentation substantially revised
| null | null | null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The established diversity of electronic topology classes lends the
opportunity to pair them into dual topological complexes. Bulk-surface
correspondence then ensures the coexistence of a combination of boundary states
that cannot be realized but only at the various surfaces of such a dual
topological material. We show that the layered compound Bi_2TeI realizes a dual
topological insulator. It exhibits band inversions at two time reversal
symmetry points of the bulk band which classify it as a weak topological
insulator with metallic states on its (010) 'side' surfaces. Additional mirror
symmetry of the crystal structure concurrently classifies it as a topological
crystalline insulator. Bi2TeI is therefore predicted to host a pair of Dirac
cones protected by time reversal symmetry on its 'side' surfaces and three
pairs of Dirac cones protected by mirror symmetry on its 'top' and 'bottom'
(001) surfaces. We spectroscopically map the top cleaved surface of Bi_2TeI,
and crystallographic step edges therein. We show the existence of both two
dimensional surface states which are susceptible to mirror symmetry breaking,
as well as one dimensional channels that reside along the step edges. Their
mutual coexistence on the step edge where both facets join is facilitated by
momentum and energy segregation. Our observations of a dual topological
insulator make way to additional pairing of other dual topology classes with
distinct surface manifestations coexisting at their boundaries.
|
[{'version': 'v1', 'created': 'Tue, 29 Aug 2017 23:54:38 GMT'}
{'version': 'v2', 'created': 'Mon, 11 Jun 2018 13:59:41 GMT'}]
|
2018-06-12
|
[array(['Avraham', 'Nurit', ''], dtype=object)
array(['Norris', 'Andrew', ''], dtype=object)
array(['Sun', 'Yan', ''], dtype=object)
array(['Qi', 'Yanpeng', ''], dtype=object)
array(['Pan', 'Lin', ''], dtype=object)
array(['Isaeva', 'Anna', ''], dtype=object)
array(['Zeugner', 'Alexander', ''], dtype=object)
array(['Felser', 'Claudia', ''], dtype=object)
array(['Yan', 'Binghai', ''], dtype=object)
array(['Beidenkopf', 'Haim', ''], dtype=object)]
|
5,890 |
0903.3498
|
Bruno. Cessac
|
Bruno Cessac, H\'el\`ene Paugam-Moisy, Thierry Vi\'eville
|
Indisputable facts when implementing spiking neuron networks
|
29 pages, 11 figures, submitted
|
J. Physiol., Paris, 104, (1-2), 5-18, (2010)
| null | null |
q-bio.NC physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, our wish is to demystify some aspects of coding with
spike-timing, through a simple review of well-understood technical facts
regarding spike coding. The goal is to help better understanding to which
extend computing and modelling with spiking neuron networks can be biologically
plausible and computationally efficient. We intentionally restrict ourselves to
a deterministic dynamics, in this review, and we consider that the dynamics of
the network is defined by a non-stochastic mapping. This allows us to stay in a
rather simple framework and to propose a review with concrete numerical values,
results and formula on (i) general time constraints, (ii) links between
continuous signals and spike trains, (iii) spiking networks parameter
adjustments. When implementing spiking neuron networks, for computational or
biological simulation purposes, it is important to take into account the
indisputable facts here reviewed. This precaution could prevent from
implementing mechanisms meaningless with regards to obvious time constraints,
or from introducing spikes artificially, when continuous calculations would be
sufficient and simpler. It is also pointed out that implementing a spiking
neuron network is finally a simple task, unless complex neural codes are
considered.
|
[{'version': 'v1', 'created': 'Fri, 20 Mar 2009 12:14:35 GMT'}]
|
2010-03-02
|
[array(['Cessac', 'Bruno', ''], dtype=object)
array(['Paugam-Moisy', 'Hélène', ''], dtype=object)
array(['Viéville', 'Thierry', ''], dtype=object)]
|
5,891 |
1609.01517
|
Carlo Comin
|
Carlo Comin and Romeo Rizzi
|
Faster O(|V|^2|E|W)-Time Energy Algorithms for Optimal Strategy
Synthesis in Mean Payoff Games
| null | null | null | null |
cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This study strengthens the links between Mean Payoff Games (\MPG{s}) and
Energy Games (EG{s}). Firstly, we offer a faster $O(|V|^2|E|W)$
pseudo-polynomial time and $\Theta(|V|+|E|)$ space deterministic algorithm for
solving the Value Problem and Optimal Strategy Synthesis in \MPG{s}. This
improves the best previously known estimates on the pseudo-polynomial time
complexity to: \[ O(|E|\log |V|) + \Theta\Big(\sum_{v\in
V}\texttt{deg}_{\Gamma}(v)\cdot\ell_{\Gamma}(v)\Big) = O(|V|^2|E|W), \] where
$\ell_{\Gamma}(v)$ counts the number of times that a certain energy-lifting
operator $\delta(\cdot, v)$ is applied to any $v\in V$, along a certain
sequence of Value-Iterations on reweighted \EG{s}; and
$\texttt{deg}_{\Gamma}(v)$ is the degree of $v$. This improves significantly
over a previously known pseudo-polynomial time estimate, i.e.
$\Theta\big(|V|^2|E|W + \sum_{v\in
V}\texttt{deg}_{\Gamma}(v)\cdot\ell_{\Gamma}(v)\big)$ \citep{CR15, CR16}, as
the pseudo-polynomiality is now confined to depend solely on $\ell_\Gamma$.
Secondly, we further explore on the relationship between Optimal Positional
Strategies (OPSs) in \MPG{s} and Small Energy-Progress Measures (SEPMs) in
reweighted \EG{s}. It is observed that the space of all OPSs,
$\texttt{opt}_{\Gamma}\Sigma^M_0$, admits a unique complete decomposition in
terms of extremal-SEPM{s} in reweighted EG{s}. This points out what we called
the "Energy-Lattice $\mathcal{X}^*_{\Gamma}$ associated to
$\texttt{opt}_{\Gamma}\Sigma^M_0$". Finally, it is offered a pseudo-polynomial
total-time recursive procedure for enumerating (w/o repetitions) all the
elements of $\mathcal{X}^*_{\Gamma}$, and for computing the corresponding
partitioning of $\texttt{opt}_{\Gamma}\Sigma^M_0$.
|
[{'version': 'v1', 'created': 'Tue, 6 Sep 2016 12:39:43 GMT'}]
|
2016-09-07
|
[array(['Comin', 'Carlo', ''], dtype=object)
array(['Rizzi', 'Romeo', ''], dtype=object)]
|
5,892 |
hep-ph/9808296
|
Stephen King
|
S. Davidson and S. F. King
|
Bi-Maximal Neutrino Mixing in the MSSM with a Single Right-Handed
Neutrino
|
18 pages, Latex. References to bi-maximal mixing fixed
|
Phys.Lett. B445 (1998) 191-198
|
10.1016/S0370-2693(98)01442-7
|
CERN-TH/98-256
|
hep-ph
| null |
We discuss neutrino masses in the framework of a minimal extension of the
minimal supersymmetric standard model (MSSM) consisting of an additional single
right-handed neutrino superfield $N$ with a heavy Majorana mass $M$, which
induces a single light see-saw mass $m_{\nu_3}$ leaving two neutrinos massless
at tree-level. This trivial extension to the MSSM may account for the
atomospheric neutrino data via $\nu_{\mu}\to \nu_{\tau}$ oscillations by
assuming a near maximal mixing angle $\theta_{23}\sim \pi/4$ and taking $\Delta
m_{23}^2 \sim m_{\nu_3}^2 \sim 2.5\times 10^{-3} eV^2$. In order to account for
the solar neutrino data we appeal to one-loop radiative corrections involving
internal loops of SUSY particles, which we show can naturally generate an
additional light neutrino mass $m_{\nu_{2}}\sim 10^{-5} eV$ again with near
maximal mixing angle $\theta_{12}\sim \pi/4$. The resulting scheme corresponds
to so-called ``bi-maximal'' neutrino mixing involving ``just-so'' solar
oscillations.
|
[{'version': 'v1', 'created': 'Tue, 11 Aug 1998 17:19:39 GMT'}
{'version': 'v2', 'created': 'Wed, 12 Aug 1998 20:23:07 GMT'}
{'version': 'v3', 'created': 'Thu, 13 Aug 1998 16:17:20 GMT'}]
|
2009-10-31
|
[array(['Davidson', 'S.', ''], dtype=object)
array(['King', 'S. F.', ''], dtype=object)]
|
5,893 |
cond-mat/0311273
|
Sorin Tanase-Nicola
|
Sorin Tanase-Nicola and Jorge Kurchan
|
Metastable states, transitions, basins and borders at finite
temperatures
| null | null |
10.1023/B:JOSS.0000041739.53068.6a
| null |
cond-mat.stat-mech hep-th
| null |
Langevin/Fokker-Planck processes can be immersed in a larger frame by adding
fictitious fermion variables. The (super)symmetry of this larger structure has
been used to derive Morse theory in an elegant way. The original physical
diffusive motion is retained in the zero-fermion subspace. Here we study the
subspaces with non-zero fermion number which yield deep information, as well as
new computational strategies, for barriers, reaction paths, and unstable states
-- even in non-zero temperature situations and when the barriers are of
entropic or collective nature, as in the thermodynamic limit. The presentation
is self-contained.
|
[{'version': 'v1', 'created': 'Wed, 12 Nov 2003 13:15:03 GMT'}]
|
2016-08-31
|
[array(['Tanase-Nicola', 'Sorin', ''], dtype=object)
array(['Kurchan', 'Jorge', ''], dtype=object)]
|
5,894 |
1505.06363
|
Andrea Schioppa
|
Andrea Schioppa
|
The Lip-lip equality is stable under blow-up
|
minor corrections: change of normalization of the measures; The final
version will appear in Calc. Var. PDE
|
Calculus of Variations and Partial Differential Equations February
2016, 55:22
|
10.1007/s00526-016-0957-z
| null |
math.MG math.CA math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that at generic points blow-ups/tangents of differentiability spaces
are still differentiability spaces; this implies that an analytic condition
introduced by Keith as an inequality (and later proved to actually be an
equality) passes to tangents. As an application, we characterize the $p$-weak
gradient on iterated blow-ups of differentiability spaces.
|
[{'version': 'v1', 'created': 'Sat, 23 May 2015 19:00:57 GMT'}
{'version': 'v2', 'created': 'Thu, 4 Jun 2015 15:02:25 GMT'}
{'version': 'v3', 'created': 'Sun, 13 Dec 2015 14:24:18 GMT'}]
|
2016-02-19
|
[array(['Schioppa', 'Andrea', ''], dtype=object)]
|
5,895 |
2111.08491
|
Yanjun Chen
|
C. Chen, J. Y. Che, W. Y. Li, S. Wang, X. J. Xie, J. Y. Huang, Y. G.
Peng, G. G. Xin, and Y. J. Chen
|
Response time of photoemission at quantum-classic boundary
|
11 pages, 8 figures. We have changed the title, reorganized this
article, and replaced or deleted some of the data plots, but the main
conclusions remain unchanged
| null | null | null |
physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The response time of the electron to light in photoemission is difficult to
define and measure. Tunneling ionization of atoms, a strong-laser-induced
photoemission process, provides a semiclassical case for visiting the problem.
Here, we show that the response time can be determined at the boundary between
quantum and classic. Specifically, tunneling is instantaneous but a finite
response time (about 100 attoseconds) is needed for the state of the tunneling
electron to evolve into the ionized state around tunnel exit. This time can be
well described with a compact expression related to some basic laser and atomic
parameters. Moreover, it can be directly mapped to and easily decoded from
photoelectron momentum with a simple mapping, allowing an unambiguous
measurement. These results shed light on definition and measurement of the
response time of photoemission.
|
[{'version': 'v1', 'created': 'Tue, 16 Nov 2021 14:13:18 GMT'}
{'version': 'v2', 'created': 'Sun, 29 May 2022 14:53:40 GMT'}
{'version': 'v3', 'created': 'Mon, 19 Dec 2022 14:42:03 GMT'}]
|
2022-12-20
|
[array(['Chen', 'C.', ''], dtype=object)
array(['Che', 'J. Y.', ''], dtype=object)
array(['Li', 'W. Y.', ''], dtype=object)
array(['Wang', 'S.', ''], dtype=object)
array(['Xie', 'X. J.', ''], dtype=object)
array(['Huang', 'J. Y.', ''], dtype=object)
array(['Peng', 'Y. G.', ''], dtype=object)
array(['Xin', 'G. G.', ''], dtype=object)
array(['Chen', 'Y. J.', ''], dtype=object)]
|
5,896 |
1612.01000
|
Oleg Kibis
|
O. V. Kibis, K. Dini, I. V. Iorsh, I. A. Shelykh
|
All-optical band engineering of gapped Dirac materials
|
Published version
|
Phys. Rev. B 95, 125401 (2017)
|
10.1103/PhysRevB.95.125401
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate theoretically that the interaction of electrons in gapped
Dirac materials (gapped graphene and transition-metal dichalchogenide
monolayers) with a strong off-resonant electromagnetic field (dressing field)
substantially renormalizes the band gaps and the spin-orbit splitting.
Moreover, the renormalized electronic parameters drastically depend on the
field polarization. Namely, a linearly polarized dressing field always
decreases the band gap (and, particularly, can turn the gap into zero), whereas
a circularly polarized field breaks the equivalence of valleys in different
points of the Brillouin zone and can both increase and decrease corresponding
band gaps. As a consequence, the dressing field can serve as an effective tool
to control spin and valley properties of the materials and be potentially
exploited in optoelectronic applications.
|
[{'version': 'v1', 'created': 'Sat, 3 Dec 2016 18:34:10 GMT'}
{'version': 'v2', 'created': 'Wed, 1 Mar 2017 17:20:54 GMT'}]
|
2017-03-02
|
[array(['Kibis', 'O. V.', ''], dtype=object)
array(['Dini', 'K.', ''], dtype=object)
array(['Iorsh', 'I. V.', ''], dtype=object)
array(['Shelykh', 'I. A.', ''], dtype=object)]
|
5,897 |
hep-ph/9908445
|
Katsuji Yamamoto
|
Akira Kitagawa, Katsuji Yamamoto, Seishi Matsuki
|
Quantum analysis of Rydberg atom cavity detector for dark matter axion
search
|
35 pages, 12 figures
| null | null |
NEAP-56
|
hep-ph
| null |
Quantum calculations are developed on the dynamical system consisting of the
cosmic axions, photons and Rydberg atoms which are interacting in the resonant
microwave cavity. The time evolution is determined for the number of Rydberg
atoms in the upper state which are excited by absorbing the axion-converted and
thermal background photons. The calculations are made, in particular, by taking
into account the actual experimental situation such as the motion and uniform
distribution of the Rydberg atoms in the incident beam and also the spatial
variation of the electric field in the cavity. Some essential aspects on the
axion-photon-atom interaction in the resonant cavity are clarified by these
detailed calculations. Then, by using these results the detection sensitivity
of the Rydberg atom cavity detector is estimated properly. This systematic
quantum analysis enables us to provide the optimum experimental setup for the
dark matter axion search with Rydberg atom cavity detector.
|
[{'version': 'v1', 'created': 'Tue, 24 Aug 1999 05:48:05 GMT'}]
|
2007-05-23
|
[array(['Kitagawa', 'Akira', ''], dtype=object)
array(['Yamamoto', 'Katsuji', ''], dtype=object)
array(['Matsuki', 'Seishi', ''], dtype=object)]
|
5,898 |
0909.3313
|
Christophe Morisset
|
Christophe Morisset
|
The Mexican Million Models Database: a virtual observatory for gaseous
nebulae
|
Proceeding of Data Centre Alliance Workshops, Garching, 2008.
Published in Memorie della Societa Astronomica Italiana, v.80, p.397 (2009)
| null | null | null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The 3MdB (Mexican Million Models database) is a large database of
photoionization models for H II regions. The number of free parameters for the
models is close to 15, including the description of the ionizing Spectral
Energy Distribution (effective temperature, luminosity, surface gravity, for
different type of stellar atmosphere models) and the description of the ionized
gas (distance to the ionizing source, density, abundances of the most common
elements, dust). The outputs of the models are more than 70 emission line
intensities, the ionic fractions and temperatures. All the parameters and
outputs are included in the MySQL database, giving the possibility to the user
to search into the database for example for all the models that reproduce a
given set of observations.
|
[{'version': 'v1', 'created': 'Thu, 17 Sep 2009 21:05:07 GMT'}]
|
2009-09-21
|
[array(['Morisset', 'Christophe', ''], dtype=object)]
|
5,899 |
1806.03101
|
Chen Ji
|
Chen Ji, Sonia Bacca, Nir Barnea, Oscar Javier Hernandez, Nir
Nevo-Dinur
|
Ab initio calculation of nuclear structure corrections in muonic atoms
|
62 pages, 15 figures, 8 tables
| null |
10.1088/1361-6471/aad3eb
| null |
nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The measurement of the Lamb shift in muonic hydrogen and the subsequent
emergence of the proton-radius puzzle have motivated an experimental campaign
devoted to measuring the Lamb shift in other light muonic atoms, such as muonic
deuterium and helium. For these systems it has been shown that two-photon
exchange nuclear structure corrections are the largest source of uncertainty
and consequently the bottleneck for exploiting the experimental precision to
extract the nuclear charge radius. Utilizing techniques and methods developed
to study electromagnetic reactions in light nuclei, recent calculations of
nuclear structure corrections to the muonic Lamb shift have reached
unprecedented precision, reducing the uncertainty with respect to previous
estimates by a factor of 5 in certain cases. These results will be useful for
shedding light on the nature of the proton-radius puzzle and other open
questions pertaining to it. Here, we review and update calculations for muonic
deuterium and tritium atoms, and for muonic helium-3 and helium-4 ions. We
present a thorough derivation of the formalism and discuss the results in
relation to other approaches where available. We also describe how to assess
theoretical uncertainties, for which the language of chiral effective field
theory furnishes a systematic approach that could be further exploited in the
future.
|
[{'version': 'v1', 'created': 'Fri, 8 Jun 2018 11:57:12 GMT'}]
|
2018-08-29
|
[array(['Ji', 'Chen', ''], dtype=object)
array(['Bacca', 'Sonia', ''], dtype=object)
array(['Barnea', 'Nir', ''], dtype=object)
array(['Hernandez', 'Oscar Javier', ''], dtype=object)
array(['Nevo-Dinur', 'Nir', ''], dtype=object)]
|
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