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|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
6,700 |
1910.00175
|
Xiang Tang
|
Yanli Song, Xiang Tang
|
Higher Orbit Integrals, Cyclic Cocyles, and K-theory of Reduced Group
C*-algebra
|
41 pages, minor corrections
| null | null | null |
math.KT math.FA math.OA math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let G be a connected real reductive group. Orbit integrals define traces on
the group algebra of G. We introduce a construction of higher orbit integrals
in the direction of higher cyclic cocycles on the Harish-Chandra Schwartz
algebra of G. We analyze these higher orbit integrals via Fourier transform by
expressing them as integrals on the tempered dual of G. We obtain explicit
formulas for the pairing between the higher orbit integrals and the K-theory of
the reduced group C*-algebra, and discuss their applications to representation
theory and K-theory.
|
[{'version': 'v1', 'created': 'Tue, 1 Oct 2019 02:08:38 GMT'}
{'version': 'v2', 'created': 'Thu, 7 Nov 2019 05:47:54 GMT'}]
|
2019-11-11
|
[array(['Song', 'Yanli', ''], dtype=object)
array(['Tang', 'Xiang', ''], dtype=object)]
|
6,701 |
1812.00704
|
Mikael de la Salle
|
Alessandro Carderi, Damien Gaboriau and Mikael de la Salle
|
Non-standard limits of graphs and some orbit equivalence invariants
|
64 pages; v2 and v3 small corrections and precisions added; final
version, to appear in the Annales Henri Lebesgue
|
Annales Henri Lebesgue, Volume 4 (2021), pp. 1235-1293
|
10.5802/ahl.102
| null |
math.GR math.DS math.OA
|
http://creativecommons.org/licenses/by/4.0/
|
We consider probability measure preserving discrete groupoids, group actions
and equivalence relations in the context of general probability spaces. We
study for these objects the notions of cost, $\beta$-invariant and some
higher-dimensional variants. We also propose various convergence results about
$\ell^2$-Betti numbers and rank gradient for sequences of actions, groupoids or
equivalence relations under weak finiteness assumptions. In particular we
connect the combinatorial cost with the cost of the ultralimit equivalence
relations. Finally a relative version of Stuck-Zimmer property is also
considered.
|
[{'version': 'v1', 'created': 'Mon, 3 Dec 2018 12:24:40 GMT'}
{'version': 'v2', 'created': 'Mon, 11 Feb 2019 16:42:11 GMT'}
{'version': 'v3', 'created': 'Wed, 20 Jan 2021 16:20:49 GMT'}]
|
2022-03-09
|
[array(['Carderi', 'Alessandro', ''], dtype=object)
array(['Gaboriau', 'Damien', ''], dtype=object)
array(['de la Salle', 'Mikael', ''], dtype=object)]
|
6,702 |
1002.4314
|
Florian Simatos
|
A. Ganesh, S. Lilienthal, D. Manjunath, A. Proutiere and F. Simatos
|
Load Balancing via Random Local Search in Closed and Open systems
|
Accepted to Sigmetrics 2010
| null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we analyze the performance of random load resampling and
migration strategies in parallel server systems. Clients initially attach to an
arbitrary server, but may switch server independently at random instants of
time in an attempt to improve their service rate. This approach to load
balancing contrasts with traditional approaches where clients make smart server
selections upon arrival (e.g., Join-the-Shortest-Queue policy and variants
thereof). Load resampling is particularly relevant in scenarios where clients
cannot predict the load of a server before being actually attached to it. An
important example is in wireless spectrum sharing where clients try to share a
set of frequency bands in a distributed manner.
|
[{'version': 'v1', 'created': 'Tue, 23 Feb 2010 12:06:18 GMT'}
{'version': 'v2', 'created': 'Fri, 9 Apr 2010 13:28:55 GMT'}]
|
2010-04-12
|
[array(['Ganesh', 'A.', ''], dtype=object)
array(['Lilienthal', 'S.', ''], dtype=object)
array(['Manjunath', 'D.', ''], dtype=object)
array(['Proutiere', 'A.', ''], dtype=object)
array(['Simatos', 'F.', ''], dtype=object)]
|
6,703 |
1709.04017
|
Christian Ketterer
|
Nicola Gigli, Christian Ketterer, Kazumasa Kuwada, Shin-ichi Ohta
|
Rigidity for the spectral gap on $RCD(K,\infty)$-spaces
| null | null | null | null |
math.DG math.MG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a rigidity problem for the spectral gap of the Laplacian on an
$RCD(K,\infty)$-space (a metric measure space satisfying the Riemannian
curvature-dimension condition) for positive $K$. For a weighted Riemannian
manifold, Cheng--Zhou showed that the sharp spectral gap is achieved only when
a $1$-dimensional Gaussian space is split off. This can be regarded as an
infinite-dimensional counterpart to Obata's rigidity theorem. Generalizing to
$RCD(K,\infty)$-spaces is not straightforward due to the lack of smooth
structure and doubling condition. We employ the lift of an eigenfunction to the
Wasserstein space and the theory of regular Lagrangian flows recently developed
by Ambrosio--Trevisan to overcome this difficulty.
|
[{'version': 'v1', 'created': 'Tue, 12 Sep 2017 18:50:31 GMT'}]
|
2017-09-14
|
[array(['Gigli', 'Nicola', ''], dtype=object)
array(['Ketterer', 'Christian', ''], dtype=object)
array(['Kuwada', 'Kazumasa', ''], dtype=object)
array(['Ohta', 'Shin-ichi', ''], dtype=object)]
|
6,704 |
1706.06965
|
Tao Zhang
|
Tao Zhang, Caroline Hartl, Stefan Fischer, Kilian Frank, Philipp
Nickels, Amelie Heuer-Jungemann, Bert Nickel, Tim Liedl
|
3D DNA origami crystals
|
21 pages; 4 figures; supplementary information is included
| null | null | null |
cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Engineering shape and interactions of nanoscopic building blocks allows for
the assembly of rationally designed macroscopic three-dimensional (3D)
materials with spatial accuracy inaccessible to top-down fabrication methods.
Owing to its sequence-specific interaction, DNA is often used as selective
binder to connect metallic nanoparticles into highly ordered lattices.
Moreover, 3D crystals assembled entirely from DNA have been proposed and
implemented with the declared goal to arrange guest molecules in predefined
lattices. This requires design schemes that provide high rigidity and
sufficiently large open guest space. We here present a DNA origami-based
tensegrity triangle structure that assembles into a 3D rhombohedral crystalline
lattice. We site-specifically place 10 nm and 20 nm gold particles within the
lattice, demonstrating that our crystals are spacious enough to host e.g.
ribosome-sized macromolecules. We validate the accurate assembly of the DNA
origami lattice itself as well as the precise incorporation of gold particles
by electron microscopy and small angle X-ray scattering (SAXS) experiments. Our
results show that it is possible to create DNA building blocks that assemble
into lattices with customized geometry. Site-specific hosting of nano objects
in the transparent DNA lattice sets the stage for metamaterial and structural
biology applications.
|
[{'version': 'v1', 'created': 'Wed, 21 Jun 2017 15:41:45 GMT'}]
|
2017-06-22
|
[array(['Zhang', 'Tao', ''], dtype=object)
array(['Hartl', 'Caroline', ''], dtype=object)
array(['Fischer', 'Stefan', ''], dtype=object)
array(['Frank', 'Kilian', ''], dtype=object)
array(['Nickels', 'Philipp', ''], dtype=object)
array(['Heuer-Jungemann', 'Amelie', ''], dtype=object)
array(['Nickel', 'Bert', ''], dtype=object)
array(['Liedl', 'Tim', ''], dtype=object)]
|
6,705 |
1710.08784
|
Mirna Kramar
|
Felix B\"auerle, Mirna Kramar, Karen Alim
|
Spatial mapping reveals multi-step pattern of wound healing in Physarum
polycephalum
|
Felix B\"auerle and Mirna Kramar contributed equally to this work
|
Journal of Physics D: Applied Physics (2017) Volume 50, Number 43
|
10.1088/1361-6463/aa8a21
| null |
q-bio.QM physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Wounding is a severe impairment of function, especially for an exposed
organism like the network-forming true slime mould Physarum polycephalum. The
tubular network making up the organism's body plan is entirely interconnected
and shares a common cytoplasm. Oscillatory contractions of the enclosing tube
walls drive the shuttle streaming of the cytoplasm. Cytoplasmic flows underlie
the reorganization of the network for example by movement toward attractive
stimuli or away from repellants. Here, we follow the reorganization of Physarum
polycephalum networks after severe wounding. Spatial mapping of the contraction
changes in response to wounding reveal a multi-step pattern. Phases of
increased activity alternate with cessation of contractions and stalling of
flows, giving rise to coordinated transport and growth at the severing site.
Overall, severing surprisingly acts like an attractive stimulus enabling
healing of severed tubes. The reproducible cessation of contractions arising
during this wound-healing response may open up new venues to investigate the
biochemical wiring underlying Physarum polycephalum's complex behaviours.
|
[{'version': 'v1', 'created': 'Tue, 24 Oct 2017 14:06:41 GMT'}]
|
2017-10-25
|
[array(['Bäuerle', 'Felix', ''], dtype=object)
array(['Kramar', 'Mirna', ''], dtype=object)
array(['Alim', 'Karen', ''], dtype=object)]
|
6,706 |
1510.06285
|
Can Onur Avci
|
Can Onur Avci, Kevin Garello, Johannes Mendil, Abhijit Ghosh, Nicolas
Blasakis, Mihai Gabureac, Morgan Trassin, Manfred Fiebig, and Pietro
Gambardella
|
Magnetoresistance of heavy and light metal/ferromagnet bilayers
|
14 pages, 5 figures
|
Appl. Phys. Lett. 107, 192405 (2015)
|
10.1063/1.4935497
| null |
cond-mat.mes-hall cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We studied the magnetoresistance of normal metal (NM)/ferromagnet (FM)
bilayers in the linear and nonlinear (current-dependent) regimes and compared
it with the amplitude of the spin-orbit torques and thermally induced electric
fields. Our experiments reveal that the magnetoresistance of the heavy NM/Co
bilayers (NM = Ta, W, Pt) is phenomenologically similar to the spin Hall
magnetoresistance (SMR) of YIG/Pt, but has a much larger anisotropy, of the
order of 0.5%, which increases with the atomic number of the NM. This SMR-like
behavior is absent in light NM/Co bilayers (NM = Ti, Cu), which present the
standard AMR expected of polycrystalline FM layers. In the Ta, W, Pt/Co
bilayers we find an additional magnetoresistance, directly proportional to the
current and to the transverse component of the magnetization. This so-called
unidirectional SMR, of the order of 0.005%, is largest in W and correlates with
the amplitude of the antidamping spin-orbit torque. The unidirectional SMR is
below the accuracy of our measurements in YIG/Pt.
|
[{'version': 'v1', 'created': 'Wed, 21 Oct 2015 14:52:05 GMT'}]
|
2015-11-18
|
[array(['Avci', 'Can Onur', ''], dtype=object)
array(['Garello', 'Kevin', ''], dtype=object)
array(['Mendil', 'Johannes', ''], dtype=object)
array(['Ghosh', 'Abhijit', ''], dtype=object)
array(['Blasakis', 'Nicolas', ''], dtype=object)
array(['Gabureac', 'Mihai', ''], dtype=object)
array(['Trassin', 'Morgan', ''], dtype=object)
array(['Fiebig', 'Manfred', ''], dtype=object)
array(['Gambardella', 'Pietro', ''], dtype=object)]
|
6,707 |
1608.05476
|
Fanming Qu
|
Arjan J.A. Beukman, Fanming Qu, Ken W. West, Loren N. Pfeiffer, Leo P.
Kouwenhoven
|
A non-invasive method for nanoscale electrostatic gating of pristine
materials
|
25 pages including Supporting Information
|
Nano Letters, 2015, 15, 6883
|
10.1021/acs.nanolett.5b02800
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electrostatic gating is essential for defining and control of semiconducting
devices. However, nano-fabrication processes required for depositing gates
inevitably degrade the pristine quality of the material of interest. Examples
of materials that suffer from such degradation include ultra-high mobility
GaAs/AlGaAs two-dimensional electron gases (2DEGs), graphene, topological
insulators, and nanowires. To preserve the pristine material properties, we
have developed a flip-chip setup where gates are separated from the material by
a vacuum, which allows nanoscale electrostatic gating of the material without
exposing it to invasive nano-processing. An additional benefit is the vacuum
between gates and material, which, unlike gate dielectrics, is free from charge
traps. We demonstrate the operation and feasibility of the flip-chip setup by
achieving quantum interference at integer quantum Hall states in a
Fabry-P\'erot interferometer based on a GaAs/AlGaAs 2DEG. Our results pave the
way for the study of exotic phenomena including fragile fractional quantum Hall
states by preserving the high quality of the material.
|
[{'version': 'v1', 'created': 'Fri, 19 Aug 2016 02:28:47 GMT'}]
|
2016-08-22
|
[array(['Beukman', 'Arjan J. A.', ''], dtype=object)
array(['Qu', 'Fanming', ''], dtype=object)
array(['West', 'Ken W.', ''], dtype=object)
array(['Pfeiffer', 'Loren N.', ''], dtype=object)
array(['Kouwenhoven', 'Leo P.', ''], dtype=object)]
|
6,708 |
2112.02757
|
Poornima Mahadevappa
|
Poornima Mahadevappa and Raja Kumar Murugesan
|
Review of Data Integrity Attacks and Mitigation Methods in Edge
computing
| null | null |
10.1007/978-981-16-8059-5_31
| null |
cs.CR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent years, edge computing has emerged as a promising technology due to
its unique feature of real-time computing and parallel processing. They provide
computing and storage capacity closer to the data source and bypass the distant
links to the cloud. The edge data analytics process the ubiquitous data on the
edge layer to offer real-time interactions for the application. However, this
process can be prone to security threats like gaining malicious access or
manipulating sensitive data. This can lead to the intruder's control, alter, or
add erroneous data affecting the integrity and data analysis efficiency. Due to
the lack of transparency of stakeholders processing edge data, it is
challenging to identify the vulnerabilities. Many reviews are available on data
security issues on the edge layer; however, they do not address integrity
issues exclusively. Therefore, this paper concentrates only on data integrity
threats that directly influence edge data analysis. Further shortcomings in
existing work are identified with few research directions.
|
[{'version': 'v1', 'created': 'Mon, 6 Dec 2021 03:17:23 GMT'}]
|
2021-12-07
|
[array(['Mahadevappa', 'Poornima', ''], dtype=object)
array(['Murugesan', 'Raja Kumar', ''], dtype=object)]
|
6,709 |
1809.01002
|
Valtteri Lahtinen
|
Valtteri Lahtinen, P. Robert Kotiuga, Antti Stenvall
|
An electrical engineering perspective on missed opportunities in
computational physics
|
Minor revision and change of LaTeX template
| null | null | null |
math.NA math.CT physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We look at computational physics from an electrical engineering perspective
and suggest that several concepts of mathematics, not so well-established in
computational physics literature, present themselves as opportunities in the
field. We emphasize the virtues of the concept of elliptic complex and
highlight the category theoretical background and its role as a unifying
language between algebraic topology, differential geometry and modelling
software design. In particular, the ubiquitous concept of naturality is
central. We discuss the Galerkin finite element method as a way to achieve a
discrete formulation and discuss its compatibility with so-called cochain
methods. Despite the apparent differences in their underlying principles, in
both one finds a finite-dimensional subcomplex of a cochain complex. From such
a viewpoint, compatibility of a discretization boils down to preserving
properties in such a process. Via reflection on the historical background and
the identification of common structures, forward-looking research questions may
be framed.
|
[{'version': 'v1', 'created': 'Thu, 30 Aug 2018 16:35:19 GMT'}
{'version': 'v2', 'created': 'Wed, 10 Oct 2018 09:10:59 GMT'}]
|
2018-10-11
|
[array(['Lahtinen', 'Valtteri', ''], dtype=object)
array(['Kotiuga', 'P. Robert', ''], dtype=object)
array(['Stenvall', 'Antti', ''], dtype=object)]
|
6,710 |
1511.08463
|
Patrick Farrell
|
Patrick E. Farrell and Corrado Maurini
|
Linear and nonlinear solvers for variational phase-field models of
brittle fracture
| null | null | null | null |
math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The variational approach to fracture is effective for simulating the
nucleation and propagation of complex crack patterns, but is computationally
demanding. The model is a strongly nonlinear non-convex variational inequality
that demands the resolution of small length scales. The current standard
algorithm for its solution, alternate minimization, is robust but converges
slowly and demands the solution of large, ill-conditioned linear subproblems.
In this paper, we propose several advances in the numerical solution of this
model that improve its computational efficiency. We reformulate alternate
minimization as a nonlinear Gauss-Seidel iteration and employ over-relaxation
to accelerate its convergence; we compose this accelerated alternate
minimization with Newton's method, to further reduce the time to solution; and
we formulate efficient preconditioners for the solution of the linear
subproblems arising in both alternate minimization and in Newton's method. We
investigate the improvements in efficiency on several examples from the
literature; the new solver is 5--6$\times$ faster on a majority of the test
cases
|
[{'version': 'v1', 'created': 'Thu, 26 Nov 2015 18:03:08 GMT'}
{'version': 'v2', 'created': 'Tue, 17 May 2016 19:14:10 GMT'}]
|
2016-05-18
|
[array(['Farrell', 'Patrick E.', ''], dtype=object)
array(['Maurini', 'Corrado', ''], dtype=object)]
|
6,711 |
0710.4808
|
EDA Publishing Association
|
Young-Taek Kim, Taehun Kim, Youngduk Kim, Chulho Shin, Eui-Young
Chung, Kyu-Myung Choi, Jeong-Taek Kong, Soo-Kwan Eo
|
Fast and Accurate Transaction Level Modeling of an Extended AMBA2.0 Bus
Architecture
|
Submitted on behalf of EDAA (http://www.edaa.com/)
|
Dans Design, Automation and Test in Europe | Designers'Forum -
DATE'05, Munich : Allemagne (2005)
| null | null |
cs.AR
| null |
Transaction Level Modeling (TLM) approach is used to meet the simulation
speed as well as cycle accuracy for large scale SoC performance analysis. We
implemented a transaction-level model of a proprietary bus called AHB+ which
supports an extended AMBA2.0 protocol. The AHB+ transaction-level model shows
353 times faster than pin-accurate RTL model while maintaining 97% of accuracy
on average. We also present the development procedure of TLM of a bus
architecture.
|
[{'version': 'v1', 'created': 'Thu, 25 Oct 2007 11:59:15 GMT'}]
|
2011-11-09
|
[array(['Kim', 'Young-Taek', ''], dtype=object)
array(['Kim', 'Taehun', ''], dtype=object)
array(['Kim', 'Youngduk', ''], dtype=object)
array(['Shin', 'Chulho', ''], dtype=object)
array(['Chung', 'Eui-Young', ''], dtype=object)
array(['Choi', 'Kyu-Myung', ''], dtype=object)
array(['Kong', 'Jeong-Taek', ''], dtype=object)
array(['Eo', 'Soo-Kwan', ''], dtype=object)]
|
6,712 |
1006.0008
|
Bryan Quaife
|
Mary-Catherine Kropinski and Bryan Quaife
|
Fast integral equation methods for the modified Helmholtz equation
|
Published in Computers & Mathematics with Applications
| null |
10.1016/j.jcp.2010.09.030
| null |
math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a collection of integral equation methods for the solution to the
two-dimensional, modified Helmholtz equation, $u(\x) - \alpha^2 \Delta u(\x) =
0$, in bounded or unbounded multiply-connected domains. We consider both
Dirichlet and Neumann problems. We derive well-conditioned Fredholm integral
equations of the second kind, which are discretized using high-order, hybrid
Gauss-trapezoid rules. Our fast multipole-based iterative solution procedure
requires only O(N) or $O(N\log N)$ operations, where N is the number of nodes
in the discretization of the boundary. We demonstrate the performance of the
methods on several numerical examples.
|
[{'version': 'v1', 'created': 'Mon, 31 May 2010 20:09:54 GMT'}
{'version': 'v2', 'created': 'Thu, 8 Aug 2013 17:39:04 GMT'}]
|
2015-05-19
|
[array(['Kropinski', 'Mary-Catherine', ''], dtype=object)
array(['Quaife', 'Bryan', ''], dtype=object)]
|
6,713 |
hep-th/9709009
| null |
Mario Paschke, Florian Scheck, Andrzej Sitarz (Univ. Mainz)
|
Can (noncommutative) geometry accommodate leptoquarks?
|
LaTeX2e, uses amsmath, amsthm, amsfonts
|
Phys. Rev. D 59, 035003 (1999)
|
10.1103/PhysRevD.59.035003
|
MZ-TH/97-31
|
hep-th
| null |
We investigate the geometric interpretation of the Standard Model based on
noncommutative geometry. Neglecting the $S_0$-reality symmetry one may
introduce leptoquarks into the model. We give a detailed discussion of the
consequences (both for the Connes-Lott and the spectral action) and compare the
results with physical bounds. Our result is that in either case one contradicts
the experimental results.
|
[{'version': 'v1', 'created': 'Mon, 1 Sep 1997 13:51:20 GMT'}]
|
2016-08-25
|
[array(['Paschke', 'Mario', '', 'Univ. Mainz'], dtype=object)
array(['Scheck', 'Florian', '', 'Univ. Mainz'], dtype=object)
array(['Sitarz', 'Andrzej', '', 'Univ. Mainz'], dtype=object)]
|
6,714 |
1103.2539
|
Pierre Rouchon
|
Nadege Zarrouati, Emanuel Aldea, Pierre Rouchon
|
SO(3)-invariant asymptotic observers for dense depth field estimation
based on visual data and known camera motion
|
Submitted
| null | null | null |
math.OC cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we use known camera motion associated to a video sequence of a
static scene in order to estimate and incrementally refine the surrounding
depth field. We exploit the SO(3)-invariance of brightness and depth fields
dynamics to customize standard image processing techniques. Inspired by the
Horn-Schunck method, we propose a SO(3)-invariant cost to estimate the depth
field. At each time step, this provides a diffusion equation on the unit
Riemannian sphere that is numerically solved to obtain a real time depth field
estimation of the entire field of view. Two asymptotic observers are derived
from the governing equations of dynamics, respectively based on optical flow
and depth estimations: implemented on noisy sequences of synthetic images as
well as on real data, they perform a more robust and accurate depth estimation.
This approach is complementary to most methods employing state observers for
range estimation, which uniquely concern single or isolated feature points.
|
[{'version': 'v1', 'created': 'Sun, 13 Mar 2011 18:12:18 GMT'}
{'version': 'v2', 'created': 'Thu, 29 Sep 2011 12:24:23 GMT'}]
|
2015-03-19
|
[array(['Zarrouati', 'Nadege', ''], dtype=object)
array(['Aldea', 'Emanuel', ''], dtype=object)
array(['Rouchon', 'Pierre', ''], dtype=object)]
|
6,715 |
2206.01265
|
Adrian Sescu
|
Omar Es-Sahli, Adrian Sescu, Mohammed Afsar, Yuji Hattori
|
Investigation of G\"{o}rtler vortices in high-speed boundary layers via
an efficient numerical solution to the non-linear boundary region equations
|
22 pages
|
TCFD, 36(2), 237-249 (2022)
|
10.1007/s00162-021-00576-w
| null |
physics.flu-dyn
|
http://creativecommons.org/licenses/by/4.0/
|
Streamwise vortices and the associated streaks evolve in boundary layers over
flat or concave surfaces due to disturbances initiated upstream or triggered by
the wall surface. Following the transient growth phase, the fully-developed
vortex structures become susceptible to inviscid secondary instabilities
resulting in early transition to turbulence via `bursting' processes. In
high-speed boundary layers, more complications arise due to compressibility and
thermal effects, which become more significant for higher Mach numbers. In this
paper, we study G\"{o}rtler vortices developing in high-speed boundary layers
using the boundary region equations (BRE) formalism, which we solve using an
efficient numerical algorithm. Streaks are excited using a small transpiration
velocity at the wall. Our BRE-based algorithm is found to be superior to direct
numerical simulation (DNS) and ad-hoc nonlinear parabolized stability equation
(PSE) models. BRE solutions are less computationally costly than a full DNS and
have a more rigorous theoretical foundation than PSE-based models. For example,
the full development of a G\"{o}rtler vortex system in high-speed boundary
layers can be predicted in a matter of minutes using a single processor via the
BRE approach. This substantial reduction in calculation time is one of the
major achievements of this work. We show, among other things, that it allows
investigation into feedback control in reasonable total computational times. We
investigate the development of the G\"{o}rtler vortex system via the BRE
solution with feedback control parametrically at various freestream Mach
numbers $M_\infty$ and spanwise separations $\lambda$ of the inflow
disturbances.
|
[{'version': 'v1', 'created': 'Thu, 2 Jun 2022 19:43:44 GMT'}]
|
2022-06-06
|
[array(['Es-Sahli', 'Omar', ''], dtype=object)
array(['Sescu', 'Adrian', ''], dtype=object)
array(['Afsar', 'Mohammed', ''], dtype=object)
array(['Hattori', 'Yuji', ''], dtype=object)]
|
6,716 |
0908.0019
|
Alejandro Romanelli
|
Alejandro Romanelli
|
Driving quantum walk spreading with the coin operator
|
6 pages, 3 figures, appendix added. to appear in PRA
| null |
10.1103/PhysRevA.80.042332
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalize the discrete quantum walk on the line using a time dependent
unitary coin operator. We find an analytical relation between the long-time
behaviors of the standard deviation and the coin operator. Selecting the coin
time sequence allows to obtain a variety of predetermined asymptotic
wave-function spreadings: ballistic, sub-ballistic, diffusive, sub-diffusive
and localized.
|
[{'version': 'v1', 'created': 'Fri, 31 Jul 2009 22:46:32 GMT'}
{'version': 'v2', 'created': 'Thu, 8 Oct 2009 19:29:32 GMT'}]
|
2015-05-13
|
[array(['Romanelli', 'Alejandro', ''], dtype=object)]
|
6,717 |
nucl-th/0502019
|
Stepan G. Mashnik
|
S. G. Mashnik, K. K. Gudima, A. J. Sierk, and R. E. Prael
|
Improved Intranuclear Cascade Models for the Codes CEM2k and LAQGSM
|
5 pages, pdf, 6 figures, to be published in Proc. Int. Conf. on
Nuclear Data for Science & Technology (ND2004), Santa Fe, USA, Sept. 26 -
Oct. 1, 2004
| null |
10.1063/1.1945220
|
LA-UR-05-0711
|
nucl-th astro-ph nucl-ex
| null |
An improved version of the Cascade-Exciton Model (CEM) of nuclear reactions
implemented in the codes CEM2k and the Los Alamos version of the Quark-Gluon
String Model (LAQGSM) has been developed recently at LANL to describe reactions
induced by particles and nuclei at energies up to hundreds of GeV/nucleon for a
number of applications. We present several improvements to the intranuclear
cascade models used in CEM2k and LAQGSM developed recently to better describe
the physics of nuclear reactions. First, we incorporate the photonuclear mode
from CEM2k into LAQGSM to allow it to describe photonuclear reactions, not
previously modeled there. Then, we develop new approximations to describe more
accurately experimental elementary energy and angular distributions of
secondary particles from hadron-hadron and photon-hadron interactions using
available data and approximations published by other authors. Finally, to
consider reactions involving very highly excited nuclei (E* > 2-3 MeV/A), we
have incorporated into CEM2k and LAQGSM the Statistical Multifragmentation
Model (SMM), as a possible reaction mechanism occurring after the
preequilibrium stage. A number of other refinements to our codes developed
recently are also listed.
|
[{'version': 'v1', 'created': 'Mon, 7 Feb 2005 17:07:21 GMT'}]
|
2009-11-11
|
[array(['Mashnik', 'S. G.', ''], dtype=object)
array(['Gudima', 'K. K.', ''], dtype=object)
array(['Sierk', 'A. J.', ''], dtype=object)
array(['Prael', 'R. E.', ''], dtype=object)]
|
6,718 |
1304.5555
|
Zachary Maddock
|
Zachary Maddock
|
Regular del Pezzo surfaces with irregularity
|
23 pages, 1 figure (on page 2)
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct the first examples of regular del Pezzo surfaces for which the
irregularity (i.e. the dimension of the first cohomology group of the structure
sheaf) is nonzero. We also find a restriction on the integer pairs that are
possible as the anti-canonical degree and irregularity of such a surface.
|
[{'version': 'v1', 'created': 'Fri, 19 Apr 2013 22:03:17 GMT'}]
|
2013-04-23
|
[array(['Maddock', 'Zachary', ''], dtype=object)]
|
6,719 |
1304.3294
|
Salvador Miret-Artes
|
Eli Pollak and S. Miret-Artes
|
Second order classical perturbation theory for atom surface scattering:
analysis of asymmetry in the angular distribution
| null |
J. Chem. Phys. 140, 024709 (2014)
| null | null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A second order classical perturbation theory is developed and applied to
elastic atom corrugated surface scattering. The resulting theory accounts for
experimentally observed asymmetry in the final angular distributions. These
include qualitative features, such as reduction of the asymmetry with increased
incidence energy as well as asymmetry in the location of the rainbow peaks with
respect to the specular scattering angle. The theory is especially applicable
to "soft" corrugated potentials. Analytic expressions for the angular
distribution are derived for the exponential repulsive and Morse potential
models. The theory is implemented numerically to a simplified model of the
scattering of an Ar atom from a LiF(100) surface.
|
[{'version': 'v1', 'created': 'Thu, 11 Apr 2013 13:34:02 GMT'}]
|
2014-01-16
|
[array(['Pollak', 'Eli', ''], dtype=object)
array(['Miret-Artes', 'S.', ''], dtype=object)]
|
6,720 |
1511.08156
|
Letao Zhang
|
Letao Zhang and Zhiyu Tian
|
Weak Approximation for Cubic Hypersurfaces and Degree 4 del Pezzo
Surfaces
|
Comments are welcome
| null | null | null |
math.AG math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we prove the following theorems about weak approximation of
smooth cubic hypersurfaces and del Pezzo surfaces of degree 4 defined over
global fields. (1) For cubic hypersurfaces defined over global function fields,
if there is a rational point, then weak approximation holds at places of good
reduction whose residual field has at least 11 elements. (2) For del Pezzo
surfaces of degree 4 defined over global function fields, if there is a
rational point, then weak approximation holds at places of good reduction whose
residual field has at least 13 elements. (3) Weak approximation holds for cubic
hypersurfaces of dimension at least 10 defined over a global function field of
characteristic not equal to 2, 3, 5 or a purely imaginary number field.
|
[{'version': 'v1', 'created': 'Wed, 25 Nov 2015 19:03:57 GMT'}]
|
2015-11-26
|
[array(['Zhang', 'Letao', ''], dtype=object)
array(['Tian', 'Zhiyu', ''], dtype=object)]
|
6,721 |
0706.2160
|
Menachem Shlossberg
|
Menachem Shlossberg
|
Minimality in topological groups and Heisenberg type groups
|
11 pages
| null | null | null |
math.GN math.GR
| null |
We study relatively minimal subgroups in topological groups. We find, in
particular, some natural relatively minimal subgroups in unipotent groups which
are defined over "good" rings. By "good" rings we mean archimedean absolute
valued (not necessarily associative) division rings. Some of the classical
rings which we consider besides the field of reals are the ring of quaternions
and the ring of octonions. This way we generalize in part a previous result
which was obtained by Dikranjan and Megrelishvili and involved the Heisenberg
group.
|
[{'version': 'v1', 'created': 'Thu, 14 Jun 2007 17:02:27 GMT'}]
|
2007-06-15
|
[array(['Shlossberg', 'Menachem', ''], dtype=object)]
|
6,722 |
2206.05873
|
Changjun Gao
|
Changjun Gao
|
The metric of general rotating spacetimes
|
11 pages
| null | null | null |
gr-qc astro-ph.HE astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose the metric for general rotating spacetimes. These spacetimes are
stationary, axially symmetric and spatially asymptotically flat. They can be
the spacetimes outside of rotating black holes or rotating celestial bodies
such as the Sun and the Earth. The metric functions are expanded in power
series of distance and the angle variable is included in the expansion
coefficients.
|
[{'version': 'v1', 'created': 'Mon, 13 Jun 2022 01:49:14 GMT'}
{'version': 'v2', 'created': 'Mon, 20 Jun 2022 07:06:51 GMT'}]
|
2022-06-22
|
[array(['Gao', 'Changjun', ''], dtype=object)]
|
6,723 |
1703.06003
|
Huy Phan
|
Huy Q. Phan, Hongbo Fu, and Antoni B. Chan
|
Color Orchestra: Ordering Color Palettes for Interpolation and
Prediction
|
IEEE Transactions on Visualization and Computer Graphics
| null | null | null |
cs.CV cs.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Color theme or color palette can deeply influence the quality and the feeling
of a photograph or a graphical design. Although color palettes may come from
different sources such as online crowd-sourcing, photographs and graphical
designs, in this paper, we consider color palettes extracted from fine art
collections, which we believe to be an abundant source of stylistic and unique
color themes. We aim to capture color styles embedded in these collections by
means of statistical models and to build practical applications upon these
models. As artists often use their personal color themes in their paintings,
making these palettes appear frequently in the dataset, we employed density
estimation to capture the characteristics of palette data. Via density
estimation, we carried out various predictions and interpolations on palettes,
which led to promising applications such as photo-style exploration, real-time
color suggestion, and enriched photo recolorization. It was, however,
challenging to apply density estimation to palette data as palettes often come
as unordered sets of colors, which make it difficult to use conventional
metrics on them. To this end, we developed a divide-and-conquer sorting
algorithm to rearrange the colors in the palettes in a coherent order, which
allows meaningful interpolation between color palettes. To confirm the
performance of our model, we also conducted quantitative experiments on
datasets of digitized paintings collected from the Internet and received
favorable results.
|
[{'version': 'v1', 'created': 'Fri, 17 Mar 2017 13:25:49 GMT'}]
|
2017-03-20
|
[array(['Phan', 'Huy Q.', ''], dtype=object)
array(['Fu', 'Hongbo', ''], dtype=object)
array(['Chan', 'Antoni B.', ''], dtype=object)]
|
6,724 |
2301.02052
|
Christian Tien
|
Christian Tien
|
Relaxing Instrument Exogeneity with Common Confounders
| null | null | null | null |
econ.EM math.ST stat.TH
|
http://creativecommons.org/licenses/by/4.0/
|
Instruments can be used to identify causal effects in the presence of
unobserved confounding, under the famous relevance and exogeneity
(unconfoundedness and exclusion) assumptions. As exogeneity is difficult to
justify and to some degree untestable, it often invites criticism in
applications. Hoping to alleviate this problem, we propose a novel
identification approach, which relaxes traditional IV exogeneity to exogeneity
conditional on some unobserved common confounders. We assume there exist some
relevant proxies for the unobserved common confounders. Unlike typical proxies,
our proxies can have a direct effect on the endogenous regressor and the
outcome. We provide point identification results with a linearly separable
outcome model in the disturbance, and alternatively with strict monotonicity in
the first stage. General doubly robust and Neyman orthogonal moments are
derived consecutively to enable the straightforward root-n estimation of
low-dimensional parameters despite the high-dimensionality of nuisances,
themselves non-uniquely defined by Fredholm integral equations. Using this
novel method with NLS97 data, we separate ability bias from general selection
bias in the economic returns to education problem.
|
[{'version': 'v1', 'created': 'Thu, 5 Jan 2023 12:59:57 GMT'}
{'version': 'v2', 'created': 'Sun, 25 Jun 2023 20:42:20 GMT'}]
|
2023-06-27
|
[array(['Tien', 'Christian', ''], dtype=object)]
|
6,725 |
1901.00209
|
Anuj Nayak
|
Anuj Nayak, Seyyedali Hosseinalipour, Huaiyu Dai
|
Smart Information Spreading for Opinion Maximization in Social Networks
|
13 pages, 11 figures, INFOCOM extended version
| null | null | null |
cs.SI physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The goal of opinion maximization is to maximize the positive view towards a
product, an ideology or any entity among the individuals in social networks. So
far, opinion maximization is mainly studied as finding a set of influential
nodes for fast content dissemination in a social network. In this paper, we
propose a novel approach to solve the problem, where opinion maximization is
achieved through efficient information spreading. In our model, multiple
sources inject information continuously into the network, while the regular
nodes with heterogeneous social learning abilities spread the information to
their acquaintances through gossip mechanism. One of the sources employs smart
information spreading and the rest spread information randomly. We model the
social interactions and evolution of opinions as a dynamic Bayesian network
(DBN), using which the opinion maximization is formulated as a sequential
decision problem. Since the problem is intractable, we develop multiple
variants of centralized and decentralized learning algorithms to obtain
approximate solutions. Through simulations in synthetic and real-world
networks, we demonstrate two key results: 1) the proposed methods perform
better than random spreading by a large margin, and 2) even though the smart
source (that spreads the desired content) is unfavorably located in the
network, it can outperform the contending random sources located at favorable
positions.
|
[{'version': 'v1', 'created': 'Tue, 1 Jan 2019 21:17:14 GMT'}]
|
2019-01-03
|
[array(['Nayak', 'Anuj', ''], dtype=object)
array(['Hosseinalipour', 'Seyyedali', ''], dtype=object)
array(['Dai', 'Huaiyu', ''], dtype=object)]
|
6,726 |
1801.03648
|
Xavier Vilajosana
|
Xavier Vilajosana, Cristina Cano, Borja Martinez, Pere Tuset, Joan
Meli\`a, Ferran Adelantado
|
The Wireless Technology Landscape in the Manufacturing Industry: A
Reality Check
|
5 pages
|
MMTC Communications - Frontiers, SPECIAL ISSUE ON Multiple
Wireless Technologies and IoT in Industry: Applications and Challenges, Vol.
12, No. 6, November 2017
| null |
01-A
|
cs.CY cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An upcoming industrial IoT revolution, supposedly led by the introduction of
embedded sensing and computing, seamless communication and massive data
analytics within industrial processes [1], seems unquestionable today. Multiple
technologies are being developed, and huge marketing efforts are being made to
position solutions in this industrial landscape. However, we have observed that
industrial wireless technologies are hardly being adopted by the manufacturing
industry. In this article, we try to understand the reasons behind this current
lack of wireless technologies adoption by means of conducting visits to the
manufacturing industry and interviews with the maintenance and engineering
teams in these industries. The manufacturing industry is very diverse and
specialized, so we have tried to cover some of the most representative cases:
the automotive sector, the pharmaceutical sector (blistering), machine-tool
industries (both consumer and aerospace sectors) and robotics. We have analyzed
the technology of their machinery, their application requirements and
restrictions, and identified a list of obstacles for wireless technology
adoption. The most immediate obstacles we have found are the need to strictly
follow standards and certifications processes, as well as their prudence. But
the less obvious and perhaps even more limiting obstacles are their apparent
lack of concern regarding low energy consumption or cost which, in contrast,
are believed to be of utmost importance by wireless researchers and
practitioners. In this reality-check article, we analyze the causes of this
different perception, we identify these obstacles and devise complementary
paths to make wireless adoption by the industrial manufacturing sector a
reality in the coming years.
|
[{'version': 'v1', 'created': 'Thu, 11 Jan 2018 07:34:46 GMT'}]
|
2018-01-16
|
[array(['Vilajosana', 'Xavier', ''], dtype=object)
array(['Cano', 'Cristina', ''], dtype=object)
array(['Martinez', 'Borja', ''], dtype=object)
array(['Tuset', 'Pere', ''], dtype=object)
array(['Melià', 'Joan', ''], dtype=object)
array(['Adelantado', 'Ferran', ''], dtype=object)]
|
6,727 |
0812.4707
|
Julie Gavard
|
Julie Gavard (IC)
|
Breaking the VE-cadherin bonds
| null |
FEBS Letters / FEBS-Letters; FEBS Microbiol Lett (2008) epub ahead
of print
|
10.1016/j.febslet.2008.11.032
| null |
q-bio.CB
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Exchanges between the blood compartment and the surrounding tissues require a
tight regulation by the endothelial barrier. Recent reports inferred that
VE-cadherin, an endothelial specific cell-cell adhesion molecule, plays a
pivotal role in the formation, maturation and remodeling of the vascular wall.
Indeed, a growing number of permeability inducing factors (PIFs) was shown to
elicit signaling mechanisms culminating in VE-cadherin destabilization and
global alteration of the junctional architecture. Conversely, anti-PIFs protect
from VE-cadherin disruption and enhance cell cohesion. These findings provide
evidence on how endothelial cell-cell junctions impact the vascular network,
and change our perception about normal and aberrant angiogenesis.
|
[{'version': 'v1', 'created': 'Fri, 26 Dec 2008 20:57:25 GMT'}]
|
2008-12-31
|
[array(['Gavard', 'Julie', '', 'IC'], dtype=object)]
|
6,728 |
1708.09299
|
Markus Nentwig
|
Markus Nentwig, Anika Gro{\ss}, Maximilian M\"oller, Erhard Rahm
|
Distributed Holistic Clustering on Linked Data
| null | null | null | null |
cs.DB
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Link discovery is an active field of research to support data integration in
the Web of Data. Due to the huge size and number of available data sources,
efficient and effective link discovery is a very challenging task. Common
pairwise link discovery approaches do not scale to many sources with very large
entity sets. We here propose a distributed holistic approach to link many data
sources based on a clustering of entities that represent the same real-world
object. Our clustering approach provides a compact and fused representation of
entities, and can identify errors in existing links as well as many new links.
We support a distributed execution of the clustering approach to achieve faster
execution times and scalability for large real-world data sets. We provide a
novel gold standard for multi-source clustering, and evaluate our methods with
respect to effectiveness and efficiency for large data sets from the geographic
and music domains.
|
[{'version': 'v1', 'created': 'Wed, 30 Aug 2017 14:36:19 GMT'}]
|
2017-08-31
|
[array(['Nentwig', 'Markus', ''], dtype=object)
array(['Groß', 'Anika', ''], dtype=object)
array(['Möller', 'Maximilian', ''], dtype=object)
array(['Rahm', 'Erhard', ''], dtype=object)]
|
6,729 |
2111.09141
|
Rainer Schr\"apler
|
Rainer R. Schr\"apler, Wolf A. Landeck, J\"urgen Blum
|
Collisional properties of cm-sized high-porosity ice and dust aggregates
and their applications to early planet formation
| null | null |
10.1093/mnras/stab3348
| null |
astro-ph.EP astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In dead zones of protoplanetary discs, it is assumed that micrometre-sized
particles grow Brownian, sediment to the midplane and drift radially inward.
When collisional compaction sets in, the growing aggregates collect slower and
therefore dynamically smaller particles. This sedimentation and growth phase of
highly porous ice and dust aggregates is simulated with laboratory experiments
in which we obtained mm- to cm-sized ice aggregates with a porosity of 90\% as
well as cm-sized dust agglomerates with a porosity of 85\%. We modelled the
growth process during sedimentation in an analytical calculation to compute the
agglomerate sizes when they reach the midplane of the protoplanetary disc. In
the midplane, the dust particles form a thin dense layer and gain relative
velocities by, e.g., the streaming instability or the onset of shear
turbulence. To investigate also these collisions, we performed additional
laboratory drop tower experiments with the high-porosity aggregates formed in
the sedimentary-growth experiments and determined their mechanical parameters,
including their sticking threshold velocity, which is important for their
further collisional evolution on their way to form planetesimals. Finally, we
developed a method to calculate the packing-density-dependent fundamental
properties of our dust and ice agglomerates, the Young's modulus, the Poisson
ratio, the shear viscosity and the bulk viscosity from compression
measurements. With these parameters, it was possible to derive the coefficient
of restitution which fits our measurements. In order to physically describe
these outcomes, we applied a collision model. With this model, predictions
about general dust-aggregate collisions are possible.
|
[{'version': 'v1', 'created': 'Wed, 17 Nov 2021 14:25:30 GMT'}
{'version': 'v2', 'created': 'Tue, 1 Feb 2022 07:09:51 GMT'}]
|
2022-02-02
|
[array(['Schräpler', 'Rainer R.', ''], dtype=object)
array(['Landeck', 'Wolf A.', ''], dtype=object)
array(['Blum', 'Jürgen', ''], dtype=object)]
|
6,730 |
2211.14757
|
Hongjun Gao
|
Qiyong Cao and Hongjun Gao
|
Wong-Zakai approximation for the dynamics of stochastic evolution
equation driven by rough path with Hurst index
$H\in(\frac{1}{3},\frac{1}{2}]$
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we obtain the existence of random attractors for a class of
evolution equations driven by a geometric fractional Brownian rough path with
Hurst index $H\in(\frac{1}{3},\frac{1}{2}]$ and establish the upper
semi-continuity of random attractors $\mathcal{A}_{\eta}$ for the approximated
systems of the evolution equations.
|
[{'version': 'v1', 'created': 'Sun, 27 Nov 2022 08:08:51 GMT'}]
|
2022-11-29
|
[array(['Cao', 'Qiyong', ''], dtype=object)
array(['Gao', 'Hongjun', ''], dtype=object)]
|
6,731 |
0711.4096
|
Elena Maria Rossi Dr
|
Elena M. Rossi (JILA), Rosalba Perna (JILA) and Fr\'ed\'eric Daigne
(IAP)
|
"Orphan" afterglows in the Universal Structured Jet Model for gamma-ray
bursts
|
10 pages, 8 figures. MNRAS accepted. Moderate revisions
| null |
10.1111/j.1365-2966.2008.13736.x
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paucity of reliable achromatic breaks in Gamma-Ray Burst afterglow light
curves motivates independent measurements of the jet aperture. Serendipitous
searches of afterglows, especially at radio wavelengths, have long been the
classic alternative. These survey data have been interpreted assuming a
uniformly emitting jet with sharp edges (``top-hat'' jet), in which case the
ratio of weakly relativistically beamed afterglows to GRBs scales with the jet
solid angle. In this paper, we consider, instead, a very wide outflow with a
luminosity that decreases across the emitting surface. In particular, we adopt
the universal structured jet (USJ) model, that is an alternative to the top-hat
model for the structure of the jet. However, the interpretation of the survey
data is very different: in the USJ model we only observe the emission within
the jet aperture and the observed ratio of prompt emission rate to afterglow
rate should solely depend on selection effects. We compute the number and rate
of afterglows expected in all-sky snapshot observations as a function of the
survey sensitivity. We find that the current (negative) results for OA searches
are in agreement with our expectations. In radio and X-ray bands this was
mainly due to the low sensitivity of the surveys, while in the optical band the
sky-coverage was not sufficient. In general we find that X-ray surveys are poor
tools for OA searches, if the jet is structured. On the other hand, the FIRST
radio survey and future instruments like the Allen Telescope Array (in the
radio band) and especially GAIA, Pan-Starrs and LSST (in the optical band) will
have chances to detect afterglows.
|
[{'version': 'v1', 'created': 'Mon, 26 Nov 2007 20:23:19 GMT'}
{'version': 'v2', 'created': 'Wed, 19 Dec 2007 21:34:01 GMT'}
{'version': 'v3', 'created': 'Sun, 27 Jul 2008 01:12:31 GMT'}]
|
2009-11-13
|
[array(['Rossi', 'Elena M.', '', 'JILA'], dtype=object)
array(['Perna', 'Rosalba', '', 'JILA'], dtype=object)
array(['Daigne', 'Frédéric', '', 'IAP'], dtype=object)]
|
6,732 |
cond-mat/0404497
|
Francesco De Carlo
|
N. Basalto, R. Bellotti, F. De Carlo, P. Facchi, S. Pascazio
|
Clustering stock market companies via chaotic map synchronization
|
12 pages, 3 figures
|
Physica A 345 (2005) 196
|
10.1016/j.physa.2004.07.034
| null |
cond-mat.dis-nn cond-mat.stat-mech q-fin.ST
| null |
A pairwise clustering approach is applied to the analysis of the Dow Jones
index companies, in order to identify similar temporal behavior of the traded
stock prices. To this end, the chaotic map clustering algorithm is used, where
a map is associated to each company and the correlation coefficients of the
financial time series are associated to the coupling strengths between maps.
The simulation of a chaotic map dynamics gives rise to a natural partition of
the data, as companies belonging to the same industrial branch are often
grouped together. The identification of clusters of companies of a given stock
market index can be exploited in the portfolio optimization strategies.
|
[{'version': 'v1', 'created': 'Wed, 21 Apr 2004 09:44:39 GMT'}]
|
2010-01-31
|
[array(['Basalto', 'N.', ''], dtype=object)
array(['Bellotti', 'R.', ''], dtype=object)
array(['De Carlo', 'F.', ''], dtype=object)
array(['Facchi', 'P.', ''], dtype=object)
array(['Pascazio', 'S.', ''], dtype=object)]
|
6,733 |
2110.05345
|
Daniele Guido
|
P. Antonini, D. Guido, T. Isola, A. Rubin
|
A Note on Twisted Crossed Products and Spectral Triples
|
33 pages, various corrections and improvements
|
Journal of Geometry and Physics 180 (2022) 104640
|
10.1016/j.geomphys.2022.104640
| null |
math.OA math.DG
|
http://creativecommons.org/licenses/by/4.0/
|
Starting with a spectral triple on a unital $C^{*}$-algebra $A$ with an
action of a discrete group $G$, if the action is uniformly bounded (in a
Lipschitz sense) a spectral triple on the reduced crossed product
$C^{*}$-algebra $A\rtimes_{r} G$ is constructed in [Hawkins, Skalski, White,
Zacharias. Mathematica Scandinavica 2013]. The main instrument is the Kasparov
external product. We note that this construction still works for twisted
crossed products when the twisted action is uniformly bounded in the
appropriate sense. Under suitable assumptions we discuss some basic properties
of the resulting triples: summability and regularity. Noncommutative coverings
with finite abelian structure group are among the most basic, still
interesting, examples of twisted crossed products; we describe their main
features.
|
[{'version': 'v1', 'created': 'Mon, 11 Oct 2021 15:13:17 GMT'}
{'version': 'v2', 'created': 'Mon, 10 Jan 2022 14:52:08 GMT'}
{'version': 'v3', 'created': 'Thu, 14 Jul 2022 15:02:42 GMT'}]
|
2022-08-30
|
[array(['Antonini', 'P.', ''], dtype=object)
array(['Guido', 'D.', ''], dtype=object)
array(['Isola', 'T.', ''], dtype=object)
array(['Rubin', 'A.', ''], dtype=object)]
|
6,734 |
1012.2882
|
Constantinos Papageorgakis
|
Neil Lambert, Constantinos Papageorgakis and Maximilian
Schmidt-Sommerfeld
|
M5-Branes, D4-Branes and Quantum 5D super-Yang-Mills
|
16 pages, Latex; v2: typos corrected and references added; v3:
expanded discussion of photon states and revised Higgs mechanism, conclusions
unchanged
|
JHEP 1101:083,2011
|
10.1007/JHEP01(2011)083
|
CERN-PH-TH/2010-294, KCL-MTH-10-17
|
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the relation of the six-dimensional (2,0) M5-brane Conformal Field
Theory compactified on a circle to 5D maximally supersymmetric Yang-Mills Gauge
Theory. We show that in the broken phase 5D super-Yang-Mills contains a
spectrum of soliton states that can be identified with the complete
Kaluza-Klein modes of an M2-brane ending on the M5-branes. This provides
evidence that the (2,0) theory on a circle is equivalent to 5D super-Yang-Mills
with no additional UV degrees of freedom, suggesting that the latter is in fact
a well-defined quantum theory and possibly finite.
|
[{'version': 'v1', 'created': 'Mon, 13 Dec 2010 21:18:02 GMT'}
{'version': 'v2', 'created': 'Wed, 29 Dec 2010 20:05:37 GMT'}
{'version': 'v3', 'created': 'Tue, 22 Feb 2011 03:26:43 GMT'}]
|
2011-02-23
|
[array(['Lambert', 'Neil', ''], dtype=object)
array(['Papageorgakis', 'Constantinos', ''], dtype=object)
array(['Schmidt-Sommerfeld', 'Maximilian', ''], dtype=object)]
|
6,735 |
1604.07453
|
Delio Mugnolo
|
James B. Kennedy and Delio Mugnolo
|
The Cheeger constant of a quantum graph
|
3 pages, 1 figure, short report to appear in the proceedings of the
joint 2016 GAMM-DMV Meeting (Braunschweig)
| null |
10.1002/pamm.201610426
| null |
math.CO math.SP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the theory of Cheeger constants for graphs and quantum graphs and
their present and envisaged applications.
|
[{'version': 'v1', 'created': 'Mon, 25 Apr 2016 21:37:20 GMT'}
{'version': 'v2', 'created': 'Thu, 28 Apr 2016 17:30:38 GMT'}]
|
2018-07-26
|
[array(['Kennedy', 'James B.', ''], dtype=object)
array(['Mugnolo', 'Delio', ''], dtype=object)]
|
6,736 |
1707.05104
|
Changtao Zhong
|
Changtao Zhong, Nishanth Sastry
|
Systems Applications of Social Networks
|
Will appear in ACM computing Surveys
| null |
10.1145/3092742
| null |
cs.SI physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of this article is to provide an understanding of social networks as
a useful addition to the standard tool-box of techniques used by system
designers. To this end, we give examples of how data about social links have
been collected and used in di erent application contexts. We develop a broad
taxonomy-based overview of common properties of social networks, review how
they might be used in di erent applications, and point out potential pitfalls
where appropriate. We propose a framework, distinguishing between two main
types of social network-based user selection-personalised user selection which
identi es target users who may be relevant for a given source node, using the
social network around the source as a context, and generic user selection or
group delimitation, which lters for a set of users who satisfy a set of
application requirements based on their social properties. Using this
framework, we survey applications of social networks in three typical kinds of
application scenarios: recommender systems, content-sharing systems (e.g., P2P
or video streaming), and systems which defend against users who abuse the
system (e.g., spam or sybil attacks). In each case, we discuss potential
directions for future research that involve using social network properties.
|
[{'version': 'v1', 'created': 'Mon, 17 Jul 2017 11:33:51 GMT'}]
|
2017-07-18
|
[array(['Zhong', 'Changtao', ''], dtype=object)
array(['Sastry', 'Nishanth', ''], dtype=object)]
|
6,737 |
astro-ph/9506087
|
Grupe
|
D. Grupe, K. Beuermann, K. Mannheim, H.-C. Thomas, D. deMartino, and
H.H. Fink
|
Discovery of an ultrasoft transient ROSAT AGN: WPVS007
|
4 pages, gzipped, uuencoded PostScript, Letter accepted by Astron. &
Astrophys., also avalailable on the web
(http://www.uni-sw.gwdg.de/preprints/preprints.html)
| null | null | null |
astro-ph
| null |
We have identified the ROSAT source RX J0039.2-5117 with the previously
almost unknown `narrow line' Seyfert 1 galaxy WPVS007 (z=0.028). The X-ray
source displays quite unusual properties for an AGN. It was bright and
ultrasoft in the ROSAT All-Sky Survey (RASS) and found at a level lower by a
factor of ~ 400 in PSPC count rate in 1993. The implied 0.1-2.4 keV luminosity
during the RASS was ~ 10^{37} W. We discuss possible explanations for the
extremely soft X-ray spectrum and the observed variability.
|
[{'version': 'v1', 'created': 'Wed, 14 Jun 1995 08:35:48 GMT'}]
|
2007-05-23
|
[array(['Grupe', 'D.', ''], dtype=object)
array(['Beuermann', 'K.', ''], dtype=object)
array(['Mannheim', 'K.', ''], dtype=object)
array(['Thomas', 'H. -C.', ''], dtype=object)
array(['deMartino', 'D.', ''], dtype=object)
array(['Fink', 'H. H.', ''], dtype=object)]
|
6,738 |
2006.05162
|
Elad Levi
|
Elad Levi, Tete Xiao, Xiaolong Wang, Trevor Darrell
|
Rethinking preventing class-collapsing in metric learning with
margin-based losses
| null | null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Metric learning seeks perceptual embeddings where visually similar instances
are close and dissimilar instances are apart, but learned representations can
be sub-optimal when the distribution of intra-class samples is diverse and
distinct sub-clusters are present. Although theoretically with optimal
assumptions, margin-based losses such as the triplet loss and margin loss have
a diverse family of solutions. We theoretically prove and empirically show that
under reasonable noise assumptions, margin-based losses tend to project all
samples of a class with various modes onto a single point in the embedding
space, resulting in a class collapse that usually renders the space ill-sorted
for classification or retrieval. To address this problem, we propose a simple
modification to the embedding losses such that each sample selects its nearest
same-class counterpart in a batch as the positive element in the tuple. This
allows for the presence of multiple sub-clusters within each class. The
adaptation can be integrated into a wide range of metric learning losses. The
proposed sampling method demonstrates clear benefits on various fine-grained
image retrieval datasets over a variety of existing losses; qualitative
retrieval results show that samples with similar visual patterns are indeed
closer in the embedding space.
|
[{'version': 'v1', 'created': 'Tue, 9 Jun 2020 09:59:25 GMT'}
{'version': 'v2', 'created': 'Fri, 27 Aug 2021 14:13:34 GMT'}]
|
2021-08-30
|
[array(['Levi', 'Elad', ''], dtype=object)
array(['Xiao', 'Tete', ''], dtype=object)
array(['Wang', 'Xiaolong', ''], dtype=object)
array(['Darrell', 'Trevor', ''], dtype=object)]
|
6,739 |
0705.0453
|
Jerome Darmont
|
J\'er\^ome Darmont (LIMOS), Bertrand Petit (LIMOS), Michel Schneider
(LIMOS)
|
OCB: A Generic Benchmark to Evaluate the Performances of Object-Oriented
Database Systems
| null |
LNCS, Vol. 1377 (03/1998) 326-340
| null | null |
cs.DB
| null |
We present in this paper a generic object-oriented benchmark (the Object
Clustering Benchmark) that has been designed to evaluate the performances of
clustering policies in object-oriented databases. OCB is generic because its
sample database may be customized to fit the databases introduced by the main
existing benchmarks (e.g., OO1). OCB's current form is clustering-oriented
because of its clustering-oriented workload, but it can be easily adapted to
other purposes. Lastly, OCB's code is compact and easily portable. OCB has been
implemented in a real system (Texas, running on a Sun workstation), in order to
test a specific clustering policy called DSTC. A few results concerning this
test are presented.
|
[{'version': 'v1', 'created': 'Thu, 3 May 2007 12:54:30 GMT'}]
|
2007-05-23
|
[array(['Darmont', 'Jérôme', '', 'LIMOS'], dtype=object)
array(['Petit', 'Bertrand', '', 'LIMOS'], dtype=object)
array(['Schneider', 'Michel', '', 'LIMOS'], dtype=object)]
|
6,740 |
2212.12461
|
Tyler Thurtell
|
Tyler G. Thurtell and Akimasa Miyake
|
Optimizing one-axis twists for realistic variational Bayesian quantum
metrology
|
13 pages, 11 figures
| null | null | null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Variational Bayesian quantum metrology is a promising avenue toward quantum
advantage in sensing which optimizes both the state preparation (or encoding)
and measurement (or decoding) procedures and takes prior information into
account. For the sake of practical advantage, it is important to understand how
effective various parametrized protocols are as well as how robust they are to
the effects of complex noise, such as spatially correlated noise. First, we
propose a new family of parametrized encoding and decoding protocols called
arbitrary-axis twist ansatzes, and show that it can lead to a substantial
reduction in the number of one-axis twists needed to achieve a target
estimation error. Second, using a polynomial-size tensor network algorithm, we
analyze practical variational metrology beyond the symmetric subspace of a
collective spin, and find that quantum advantage persists for shallow-depth
ansatzes under realistic noise level.
|
[{'version': 'v1', 'created': 'Fri, 23 Dec 2022 16:45:15 GMT'}
{'version': 'v2', 'created': 'Tue, 14 Feb 2023 00:30:55 GMT'}]
|
2023-02-15
|
[array(['Thurtell', 'Tyler G.', ''], dtype=object)
array(['Miyake', 'Akimasa', ''], dtype=object)]
|
6,741 |
2003.13146
|
David Benisty
|
David Benisty, Eduardo I. Guendelman, Emil Nissimov, Svetlana Pacheva
|
$\Lambda$CDM as a Noether Symmetry in Cosmology
|
10 pages, 1 figure, accepted in IJMPD
|
Int.J.Mod.Phys. D26 (2020) no.29, 2050104
|
10.1142/S0218271820501047
| null |
astro-ph.CO gr-qc hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The standard $\Lambda$CDM model of cosmology is formulated as a simple
modified gravity coupled to a single scalar field ("darkon") possessing a
non-trivial hidden nonlinear Noether symmetry. The main ingredient in the
construction is the use of the formalism of non-Riemannian spacetime
volume-elements. The associated Noether conserved current produces
stress-energy tensor consisting of two additive parts -- dynamically generated
dark energy and dark matter components non-interacting among themselves.
Noether symmetry breaking via an additional scalar "darkon" potential
introduces naturally an interaction between dark energy and dark matter. The
correspondence between the $\Lambda$CDM model and the present "darkon" Noether
symmetry is exhibited up to linear order w.r.t. gravity-matter perturbations.
|
[{'version': 'v1', 'created': 'Sun, 29 Mar 2020 21:40:01 GMT'}
{'version': 'v2', 'created': 'Tue, 29 Sep 2020 11:57:42 GMT'}]
|
2021-01-12
|
[array(['Benisty', 'David', ''], dtype=object)
array(['Guendelman', 'Eduardo I.', ''], dtype=object)
array(['Nissimov', 'Emil', ''], dtype=object)
array(['Pacheva', 'Svetlana', ''], dtype=object)]
|
6,742 |
2209.04053
|
Thomas Steinke
|
Badih Ghazi, Ravi Kumar, Pasin Manurangsi, Thomas Steinke
|
Algorithms with More Granular Differential Privacy Guarantees
| null | null | null | null |
cs.CR cs.DS cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Differential privacy is often applied with a privacy parameter that is larger
than the theory suggests is ideal; various informal justifications for
tolerating large privacy parameters have been proposed. In this work, we
consider partial differential privacy (DP), which allows quantifying the
privacy guarantee on a per-attribute basis. In this framework, we study several
basic data analysis and learning tasks, and design algorithms whose
per-attribute privacy parameter is smaller that the best possible privacy
parameter for the entire record of a person (i.e., all the attributes).
|
[{'version': 'v1', 'created': 'Thu, 8 Sep 2022 22:43:50 GMT'}]
|
2022-09-12
|
[array(['Ghazi', 'Badih', ''], dtype=object)
array(['Kumar', 'Ravi', ''], dtype=object)
array(['Manurangsi', 'Pasin', ''], dtype=object)
array(['Steinke', 'Thomas', ''], dtype=object)]
|
6,743 |
1704.06185
|
Huacheng Yu
|
Josh Alman, Joshua R. Wang, Huacheng Yu
|
Cell-Probe Lower Bounds from Online Communication Complexity
| null | null | null | null |
cs.DS cs.CC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we introduce an online model for communication complexity.
Analogous to how online algorithms receive their input piece-by-piece, our
model presents one of the players, Bob, his input piece-by-piece, and has the
players Alice and Bob cooperate to compute a result each time before the next
piece is revealed to Bob. This model has a closer and more natural
correspondence to dynamic data structures than classic communication models do,
and hence presents a new perspective on data structures.
We first present a tight lower bound for the online set intersection problem
in the online communication model, demonstrating a general approach for proving
online communication lower bounds. The online communication model prevents a
batching trick that classic communication complexity allows, and yields a
stronger lower bound. We then apply the online communication model to prove
data structure lower bounds for two dynamic data structure problems: the Group
Range problem and the Dynamic Connectivity problem for forests. Both of the
problems admit a worst case $O(\log n)$-time data structure. Using online
communication complexity, we prove a tight cell-probe lower bound for each:
spending $o(\log n)$ (even amortized) time per operation results in at best an
$\exp(-\delta^2 n)$ probability of correctly answering a
$(1/2+\delta)$-fraction of the $n$ queries.
|
[{'version': 'v1', 'created': 'Thu, 20 Apr 2017 15:27:26 GMT'}
{'version': 'v2', 'created': 'Wed, 15 Nov 2017 18:05:06 GMT'}]
|
2017-11-16
|
[array(['Alman', 'Josh', ''], dtype=object)
array(['Wang', 'Joshua R.', ''], dtype=object)
array(['Yu', 'Huacheng', ''], dtype=object)]
|
6,744 |
1607.07432
|
Hossein Hajiabolhassan
|
Meysam Alishahi and Hossein Hajiabolhassan
|
Chromatic Number of Random Kneser Hypergraphs
| null | null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, Kupavskii~[{\it On random subgraphs of {K}neser and {S}chrijver
graphs. J. Combin. Theory Ser. A, {\rm 2016}.}] investigated the chromatic
number of random Kneser graphs $\KG_{n,k}(\rho)$ and proved that, in many
cases, the chromatic numbers of the random Kneser graph $\KG_{n,k}(\rho)$ and
the Kneser graph $\KG_{n,k}$ are almost surely closed. He also marked the
studying of the chromatic number of random Kneser hypergraphs
$\KG^r_{n,k}(\rho)$ as a very interesting problem. With the help of
$\Z_p$-Tucker lemma, a combinatorial generalization of the Borsuk-Ulam theorem,
we generalize Kupavskii's result to random general Kneser hypergraphs by
introducing an almost surely lower bound for the chromatic number of them.
Roughly speaking, as a special case of our result, we show that the chromatic
numbers of the random Kneser hypergraph $\KG^r_{n,k}(\rho)$ and the Kneser
hypergraph $\KG^r_{n,k}$ are almost surely closed in many cases. Moreover,
restricting to the Kneser and {S}chrijver graphs, we present a purely
combinatorial proof for an improvement of Kupavskii's results.
Also, for any hypergraph $\HH$, we present a lower bound for the minimum
number of colors required in a coloring of $\KG^r(\mathcal{H})$ with no
monochromatic $K_{t,\ldots,t}^r$ subhypergraph, where $K_{t,\ldots,t}^r$ is the
complete $r$-uniform $r$-partite hypergraph with $t r$ vertices such that each
of its parts has $t$ vertices. This result generalizes the lower bound for the
chromatic number of $\KG^r(\mathcal{H})$ found by the present authors~[{\it On
the chromatic number of general {K}neser hypergraphs. J. Combin. Theory, Ser.
B, {\rm 2015}.}].
|
[{'version': 'v1', 'created': 'Mon, 25 Jul 2016 19:57:01 GMT'}
{'version': 'v2', 'created': 'Sun, 14 Aug 2016 19:50:29 GMT'}]
|
2016-08-16
|
[array(['Alishahi', 'Meysam', ''], dtype=object)
array(['Hajiabolhassan', 'Hossein', ''], dtype=object)]
|
6,745 |
1702.06113
|
Matin Jafarian
|
Kees Loeff, Matin Jafarian, Jacquelien M.A. Scherpen
|
Modeling of power distribution systems with solar generation: A case
study
| null | null | null | null |
cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This document presents the data for a single-phase distribution bus (based on
IEEE 37 bus) together with the model and data for a PV inverter and active and
reactive power loads.
|
[{'version': 'v1', 'created': 'Mon, 20 Feb 2017 18:56:52 GMT'}
{'version': 'v2', 'created': 'Fri, 24 Aug 2018 17:30:02 GMT'}]
|
2018-08-27
|
[array(['Loeff', 'Kees', ''], dtype=object)
array(['Jafarian', 'Matin', ''], dtype=object)
array(['Scherpen', 'Jacquelien M. A.', ''], dtype=object)]
|
6,746 |
1803.04594
|
Jensen Li
|
Fu Liu, Tao Xu, Saisai Wang, Zhi Hong Hang and Jensen Li
|
Realizing spin-dependent gauge field with biaxial metamaterials
|
18 pages, 4 figures
|
Adv. Opt. Mater. 7, 1801582 (2019)
|
10.1002/adom.201801582
| null |
physics.optics physics.app-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Artificial magnetic field in electromagnetism is becoming an emerging way as
a robust control of light based on its geometric and topological nature. Other
than demonstrating topological photonics properties in the diffractive regime
using photonic crystals or arrays of waveguides, it will be of great interest
if similar manipulations can be done simply in the long wavelength limit, in
which only a few optical parameters can be used to describe the system, making
the future optical component design much easier. Here, by designing and
fabricating a metamaterial with split dispersion surface, we provide a
straight-forward experimental realization of spin-dependent gauge field in the
real space using a biaxial material. A "magnetic force bending" for light of
desired pseudospins is visualized experimentally by such a gauge field as a
manifestation of optical spin Hall effect. Such a demonstration is potentially
useful to develop pseudospin optics, topological components and spin-enabled
transformation optical devices.
|
[{'version': 'v1', 'created': 'Tue, 13 Mar 2018 02:03:25 GMT'}]
|
2021-08-20
|
[array(['Liu', 'Fu', ''], dtype=object)
array(['Xu', 'Tao', ''], dtype=object)
array(['Wang', 'Saisai', ''], dtype=object)
array(['Hang', 'Zhi Hong', ''], dtype=object)
array(['Li', 'Jensen', ''], dtype=object)]
|
6,747 |
1608.08527
|
Grigorios Koumoutsos
|
Nikhil Bansal, Marek Eli\'a\v{s}, {\L}ukasz Je\.z, Grigorios
Koumoutsos
|
The $(h,k)$-Server Problem on Bounded Depth Trees
|
Appeared in SODA 2017
| null |
10.1137/1.9781611974782.65
| null |
cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the $k$-server problem in the resource augmentation setting i.e.,
when the performance of the online algorithm with $k$ servers is compared to
the offline optimal solution with $h \leq k$ servers. The problem is very
poorly understood beyond uniform metrics. For this special case, the classic
$k$-server algorithms are roughly $(1+1/\epsilon)$-competitive when
$k=(1+\epsilon) h$, for any $\epsilon >0$. Surprisingly however, no
$o(h)$-competitive algorithm is known even for HSTs of depth 2 and even when
$k/h$ is arbitrarily large.
We obtain several new results for the problem. First we show that the known
$k$-server algorithms do not work even on very simple metrics. In particular,
the Double Coverage algorithm has competitive ratio $\Omega(h)$ irrespective of
the value of $k$, even for depth-2 HSTs. Similarly the Work Function Algorithm,
that is believed to be optimal for all metric spaces when $k=h$, has
competitive ratio $\Omega(h)$ on depth-3 HSTs even if $k=2h$. Our main result
is a new algorithm that is $O(1)$-competitive for constant depth trees,
whenever $k =(1+\epsilon )h$ for any $\epsilon > 0$. Finally, we give a general
lower bound that any deterministic online algorithm has competitive ratio at
least 2.4 even for depth-2 HSTs and when $k/h$ is arbitrarily large. This gives
a surprising qualitative separation between uniform metrics and depth-2 HSTs
for the $(h,k)$-server problem, and gives the strongest known lower bound for
the problem on general metrics.
|
[{'version': 'v1', 'created': 'Tue, 30 Aug 2016 16:01:31 GMT'}
{'version': 'v2', 'created': 'Tue, 11 Apr 2017 16:03:27 GMT'}]
|
2017-04-12
|
[array(['Bansal', 'Nikhil', ''], dtype=object)
array(['Eliáš', 'Marek', ''], dtype=object)
array(['Jeż', 'Łukasz', ''], dtype=object)
array(['Koumoutsos', 'Grigorios', ''], dtype=object)]
|
6,748 |
astro-ph/0106241
|
Gennaro Esposito
|
E. Fiandrini, G. Esposito, B. Bertucci, B. Alpat, R. Battiston, W.J.
Burger, G. Lamanna, P. Zuccon
|
Leptons with E>200 MeV trapped in the Earth's radiation belts
|
8 authors 14 pages 11 figures
| null |
10.1029/2001JA900151
| null |
astro-ph
| null |
For the first time accurate measurements of electron and positron fluxes in
the energy range 0.2-10 GeV have been performed with the Alpha Magnetic
Spectometer (AMS) instrument at altitudes of 370-390 Km in the geographic
latitude interval +/- 51.7 deg. We present an original analysis of the AMS
data, focused on the study of the under-cutoff component of these fluxes,
outside the region of the South Atlantic Anomaly (SAA). A separation in
quasi-trapped, long lifetime (O(10 s)), and albedo, short life time (O(100
ms)), components is found. The flux maps as a function of the canonical
adiabatic variables L, alpha0 are determined in the interval
(L,alpha0)=(0.95-3,0-90) for electrons with E less than 10 GeV, and positrons
with E less than 3 GeV. The results are compared with existing data at lower
energies and in similar L, alpha0 range. The properties of the observed
under-cutoff particles are also investigated in terms of their residence times
and geographical origin. The resulting distributions are discussed and related
to the characteristics of the drift shells observed by AMS.
|
[{'version': 'v1', 'created': 'Wed, 13 Jun 2001 14:55:50 GMT'}
{'version': 'v2', 'created': 'Mon, 17 Sep 2001 22:50:58 GMT'}]
|
2016-10-12
|
[array(['Fiandrini', 'E.', ''], dtype=object)
array(['Esposito', 'G.', ''], dtype=object)
array(['Bertucci', 'B.', ''], dtype=object)
array(['Alpat', 'B.', ''], dtype=object)
array(['Battiston', 'R.', ''], dtype=object)
array(['Burger', 'W. J.', ''], dtype=object)
array(['Lamanna', 'G.', ''], dtype=object)
array(['Zuccon', 'P.', ''], dtype=object)]
|
6,749 |
1811.09055
|
H. Geiges
|
Sebastian Durst, Hansj\"org Geiges, Marc Kegel
|
Handle homology of manifolds
|
15 pages, 8 figures; v2 includes a discussion of integral homology in
the non-orientable case
|
Topology Appl. 256 (2019), 113-127
| null | null |
math.GT math.AT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give an entirely geometric proof, without recourse to cellular homology,
of the fact that $\partial^2=0$ in the chain complex defined by a handle
decomposition of a given manifold. Topological invariance of the resulting
`handle homology' is a consequence of Cerf theory.
|
[{'version': 'v1', 'created': 'Thu, 22 Nov 2018 08:04:04 GMT'}
{'version': 'v2', 'created': 'Tue, 5 Feb 2019 14:02:07 GMT'}]
|
2019-02-19
|
[array(['Durst', 'Sebastian', ''], dtype=object)
array(['Geiges', 'Hansjörg', ''], dtype=object)
array(['Kegel', 'Marc', ''], dtype=object)]
|
6,750 |
1701.04668
|
Georgi Vodev
|
Georgi Vodev (LMJL)
|
High-frequency approximation of the interior dirichlet-to-neumann map
and applications to the transmission eigenvalues
| null | null | null | null |
math.AP math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the high-frequency behavior of the Dirichlet-to-Neumann map for an
arbitrary compact Riemannian manifold with a non-empty smooth boundary. We show
that far from the real axis it can be approximated by a simpler operator. We
use this fact to get new results concerning the location of the transmission
eigenvalues on the complex plane. In some cases we obtain optimal transmission
eigenvalue-free regions.
|
[{'version': 'v1', 'created': 'Tue, 17 Jan 2017 13:53:05 GMT'}
{'version': 'v2', 'created': 'Fri, 20 Jan 2017 15:47:42 GMT'}
{'version': 'v3', 'created': 'Tue, 28 Mar 2017 07:28:57 GMT'}]
|
2017-03-29
|
[array(['Vodev', 'Georgi', '', 'LMJL'], dtype=object)]
|
6,751 |
2204.01099
|
Pedro Sandoval-Segura
|
Pedro Sandoval-Segura
|
Adversarially robust segmentation models learn perceptually-aligned
gradients
|
12 pages, 3 figures
| null | null | null |
cs.CV cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
The effects of adversarial training on semantic segmentation networks has not
been thoroughly explored. While previous work has shown that
adversarially-trained image classifiers can be used to perform image synthesis,
we have yet to understand how best to leverage an adversarially-trained
segmentation network to do the same. Using a simple optimizer, we demonstrate
that adversarially-trained semantic segmentation networks can be used to
perform image inpainting and generation. Our experiments demonstrate that
adversarially-trained segmentation networks are more robust and indeed exhibit
perceptually-aligned gradients which help in producing plausible image
inpaintings. We seek to place additional weight behind the hypothesis that
adversarially robust models exhibit gradients that are more
perceptually-aligned with human vision. Through image synthesis, we argue that
perceptually-aligned gradients promote a better understanding of a neural
network's learned representations and aid in making neural networks more
interpretable.
|
[{'version': 'v1', 'created': 'Sun, 3 Apr 2022 16:04:52 GMT'}]
|
2022-04-05
|
[array(['Sandoval-Segura', 'Pedro', ''], dtype=object)]
|
6,752 |
cond-mat/0309150
|
Sung Yong Park
|
Sung Yong Park and David Stroud
|
Theory of the Optical Properties of a DNA-Modified Gold Nanoparticle
System
|
4 pages, 3 figures. To be published in Physica B
| null |
10.1016/j.physb.2003.08.019
| null |
cond-mat
| null |
We describe a simple model for the melting and optical properties of a
DNA/gold nanoparticle aggregate. The aggregate is modeled as a cluster of gold
nanoparticles on a periodic lattice connected by DNA bonds, and the extinction
coefficient is computed using the discrete dipole approximation. The optical
properties at fixed wavelength change dramatically at the melting transition,
which is found to be higher and narrower in temperature for larger particles,
and much sharper than that of an isolated DNA link. All these features are in
agreement with available experiments.
|
[{'version': 'v1', 'created': 'Fri, 5 Sep 2003 18:00:53 GMT'}]
|
2015-06-24
|
[array(['Park', 'Sung Yong', ''], dtype=object)
array(['Stroud', 'David', ''], dtype=object)]
|
6,753 |
2201.08468
|
Vojislav B. Mi\v{s}i\'c
|
Muhammad Suleman Saleem, Jelena Mi\v{s}i\'c, and Vojislav B.
Mi\v{s}i\'c
|
Android Malware Detection using Feature Ranking of Permissions
| null | null | null | null |
cs.CR cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the use of Android permissions as the vehicle to allow for
quick and effective differentiation between benign and malware apps. To this
end, we extract all Android permissions, eliminating those that have zero
impact, and apply two feature ranking algorithms namely Chi-Square test and
Fisher's Exact test to rank and additionally filter them, resulting in a
comparatively small set of relevant permissions. Then we use Decision Tree,
Support Vector Machine, and Random Forest Classifier algorithms to detect
malware apps. Our analysis indicates that this approach can result in better
accuracy and F-score value than other reported approaches. In particular, when
random forest is used as the classifier with the combination of Fisher's Exact
test, we achieve 99.34\% in accuracy and 92.17\% in F-score with the false
positive rate of 0.56\% for the dataset in question, with results improving to
99.82\% in accuracy and 95.28\% in F-score with the false positive rate as low
as 0.05\% when only malware from three most popular malware families are
considered.
|
[{'version': 'v1', 'created': 'Thu, 20 Jan 2022 22:08:20 GMT'}]
|
2022-01-24
|
[array(['Saleem', 'Muhammad Suleman', ''], dtype=object)
array(['Mišić', 'Jelena', ''], dtype=object)
array(['Mišić', 'Vojislav B.', ''], dtype=object)]
|
6,754 |
0805.4392
|
Warner A. Miller
|
Mark T. Gruneisen, Warner A. Miller, Raymond C. Dymale, Ayman M.
Sweiti
|
Holographic generation of complex fields with spatial light modulators:
application to quantum key distribution
|
17 pages, 6 figures, LaTex
|
Appl. Opt. 47 (no. 4) (2008) A32-A42
|
10.1364/AO.47.000A32
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There has been considerable interest recently in the generation of azimuthal
phase functions associated with photon orbital angular momentum (OAM) for
high-dimensional quantum key distribution (QKD). The generation of secure
quantum keys requires not only this pure phase basis, but also additional bases
comprised of orthonormal superposition states formed from the pure states.
These bases are also known as mutually unbiased bases (MUBs) and include
quantum states whose wave functions are modulated in both phase and amplitude.
While modulo 2\pi optical path control with high-resolution spatial light
modulators (SLMs) is well suited to creating the azimuthal phases associated
with the pure states, it does not introduce the amplitude modulation associated
with the MUB superposition states. Using computer-generated holography (CGH)
with the Leith-Upatnieks approach to hologram recording however, both phase and
amplitude modulation can be achieved. This paper presents a description of the
OAM states of a 3-dimensional MUB system and analyzes the construction of these
states via CGH with a phase modulating SLM. The effects of phase holography
artifacts on quantum-state generation are quantified and a prescription for
avoiding these artifacts by preconditioning the hologram function is presented.
Practical effects associated with spatially isolating the first-order
diffracted field are also quantified and a demonstration utilizing a liquid
crystal SLM is presented.
|
[{'version': 'v1', 'created': 'Wed, 28 May 2008 17:27:26 GMT'}]
|
2015-05-13
|
[array(['Gruneisen', 'Mark T.', ''], dtype=object)
array(['Miller', 'Warner A.', ''], dtype=object)
array(['Dymale', 'Raymond C.', ''], dtype=object)
array(['Sweiti', 'Ayman M.', ''], dtype=object)]
|
6,755 |
2306.03424
|
Wendi Liang
|
Yihan Wen, Xiaokang Zhang, Xianping Ma, Wendi Liang, Man-On Pun
|
A Generative Change Detection Model Based on Difference-Feature Guided
DDPM
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deep learning (DL) approaches, such as CNN and Transformer networks, have
shown promise in bitemporal change detection (CD). However, these approaches
have limitations in capturing long-range dependencies and incorporating 2D
structure and spatial local information, resulting in inaccurate CD maps with
discerning edges. To overcome these limitations, this paper presents a novel
end-to-end DDPM-based model called change-aware diffusion model (CADM), which
introduces three key innovations. Firstly, CADM directly generates CD maps as a
generation model. It leverages variational inference, a powerful technique for
learning complex probabilistic models, to facilitate the gradual learning and
refinement of the model's data representation. This enables CADM to effectively
distinguish subtle and irregular buildings or natural scenes from the
background. Secondly, CADM introduces an adaptive calibration conditional
difference encoding technique. This technique utilizes differences between
multi-level features to guide the sampling process, enhancing the precision of
the CD map. Lastly, CADM incorporates a noise suppression-based semantic
enhancer (NSSE) to improve the quality of the CD map. The NSSE utilizes prior
knowledge from the current step to suppress high-frequency noise, enhancing the
differential information and refining the CD map. We evaluate CADM on four
remote sensing CD tasks with different ground scenarios, including CDD, WHU,
Levier, and GVLM. Experimental results demonstrate that CADM significantly
outperforms state-of-the-art methods, indicating the generalization and
effectiveness of the proposed model.
|
[{'version': 'v1', 'created': 'Tue, 6 Jun 2023 05:51:50 GMT'}
{'version': 'v2', 'created': 'Sat, 17 Jun 2023 11:47:54 GMT'}]
|
2023-06-21
|
[array(['Wen', 'Yihan', ''], dtype=object)
array(['Zhang', 'Xiaokang', ''], dtype=object)
array(['Ma', 'Xianping', ''], dtype=object)
array(['Liang', 'Wendi', ''], dtype=object)
array(['Pun', 'Man-On', ''], dtype=object)]
|
6,756 |
1304.6001
|
Russell Neilson
|
COUPP Collaboration: E. Behnke, T. Benjamin, S.J. Brice, D.
Broemmelsiek, J.I. Collar, P.S. Cooper, M. Crisler, C.E. Dahl, D. Fustin, J.
Hall, C. Harnish, I. Levine, W.H. Lippincott, T. Moan, T. Nania, R. Neilson,
E. Ramberg, A.E. Robinson, A. Sonnenschein, and E. V\'azquez-J\'auregui, R.A.
Rivera and L. Uplegger
|
Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I
Bubble Chamber
|
5 pages, 3 figures
|
Phys. Rev. D 88, 021102 (2013)
|
10.1103/PhysRevD.88.021101
|
FERMILAB-PUB-10-318-A-CD-E
|
physics.ins-det astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have directly measured the energy threshold and efficiency for bubble
nucleation from iodine recoils in a CF3I bubble chamber in the energy range of
interest for a dark matter search. These interactions cannot be probed by
standard neutron calibration methods, so we develop a new technique by
observing the elastic scattering of 12 GeV/c negative pions. The pions are
tracked with a silicon pixel telescope and the reconstructed scattering angle
provides a measure of the nuclear recoil kinetic energy. The bubble chamber was
operated with a nominal threshold of (13.6+-0.6) keV. Interpretation of the
results depends on the response to fluorine and carbon recoils, but in general
we find agreement with the predictions of the classical bubble nucleation
theory. This measurement confirms the applicability of CF3I as a target for
spin-independent dark matter interactions and represents a novel technique for
calibration of superheated fluid detectors.
|
[{'version': 'v1', 'created': 'Mon, 22 Apr 2013 16:09:41 GMT'}
{'version': 'v2', 'created': 'Fri, 31 Jan 2014 20:31:28 GMT'}]
|
2014-02-03
|
[array(['COUPP Collaboration', '', ''], dtype=object)
array(['Behnke', 'E.', ''], dtype=object)
array(['Benjamin', 'T.', ''], dtype=object)
array(['Brice', 'S. J.', ''], dtype=object)
array(['Broemmelsiek', 'D.', ''], dtype=object)
array(['Collar', 'J. I.', ''], dtype=object)
array(['Cooper', 'P. S.', ''], dtype=object)
array(['Crisler', 'M.', ''], dtype=object)
array(['Dahl', 'C. E.', ''], dtype=object)
array(['Fustin', 'D.', ''], dtype=object)
array(['Hall', 'J.', ''], dtype=object)
array(['Harnish', 'C.', ''], dtype=object)
array(['Levine', 'I.', ''], dtype=object)
array(['Lippincott', 'W. H.', ''], dtype=object)
array(['Moan', 'T.', ''], dtype=object)
array(['Nania', 'T.', ''], dtype=object)
array(['Neilson', 'R.', ''], dtype=object)
array(['Ramberg', 'E.', ''], dtype=object)
array(['Robinson', 'A. E.', ''], dtype=object)
array(['Sonnenschein', 'A.', ''], dtype=object)
array(['Vázquez-Jáuregui', 'E.', ''], dtype=object)
array(['Rivera', 'R. A.', ''], dtype=object)
array(['Uplegger', 'L.', ''], dtype=object)]
|
6,757 |
1309.0501
|
Pallab Goswami
|
Pallab Goswami, Qimiao Si
|
Topological defects of N\'eel order and Kondo singlet formation for
Kondo-Heisenberg model on a honeycomb lattice
|
14 pages, 4 figures
|
Phys. Rev. B 89, 045124 (2014)
|
10.1103/PhysRevB.89.045124
| null |
cond-mat.str-el cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Heavy fermion systems represent a prototypical setting to study magnetic
quantum phase transitions. A particular focus has been on the physics of Kondo
destruction, which captures quantum criticality beyond the Landau framework of
order-parameter fluctuations. In this context, we study the spin one-half
Kondo-Heisenberg model on a honeycomb lattice at half filling. The problem is
approached from the Kondo destroyed, antiferromagnetically ordered insulating
phase. We describe the local moments in terms of a coarse grained quantum
non-linear sigma model, and show that the skyrmion defects of the
antiferromagnetic order parameter host a number of competing order parameters.
In addition to the spin Peierls, charge and current density wave order
parameters, we identify for the first time Kondo singlets as the competing
orders of the antiferromagnetism. We show that the antiferromagnetism and
various competing singlet orders can be related to each other via generalized
chiral transformations of the underlying fermions. We also show that the
conduction electrons acquire a Berry phase through their coupling to the
hedgehog configurations of the N\'eel order, which cancels the Berry phase of
the local moments. Our results demonstrate the competition between the
Kondo-singlet formation and spin-Peierls order when the antiferromagnetic order
is suppressed, thereby shedding new light on the global phase diagram of heavy
fermion systems at zero temperature.
|
[{'version': 'v1', 'created': 'Mon, 2 Sep 2013 19:59:47 GMT'}]
|
2014-08-08
|
[array(['Goswami', 'Pallab', ''], dtype=object)
array(['Si', 'Qimiao', ''], dtype=object)]
|
6,758 |
0711.2017
|
Jan Forbrich
|
Jan Forbrich (1,2), Karl M. Menten (1), and Mark J. Reid (2), ((1)
Max-Planck-Institut f\"ur Radioastronomie, Bonn, Germany (2)
Harvard-Smithsonian Center for Astrophysics, Cambridge, USA)
|
A 1.3 cm wavelength radio flare from a deeply embedded source in the
Orion BN/KL region
|
7 pages, 5 figures, accepted for publication in A&A
| null |
10.1051/0004-6361:20078070
| null |
astro-ph
| null |
Aims: Our aim was to measure and characterize the short-wavelength radio
emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the
BN/KL star-forming region. Methods: We used the NRAO Very Large Array at a
wavelength of 1.3 cm and we studied archival X-ray, infrared, and radio data.
Results: During our observation, a strong outburst (flux increasing >10 fold)
occurred in one of the 16 sources detected at a wavelength of 1.3cm, while the
others remained (nearly) constant. This source does not have an infrared
counterpart, but has subsequently been observed to flare in X-rays. Curiously,
a very weak variable double radio source was found at other epochs near this
position, one of whose components is coincident with it. A very high extinction
derived from modeling the X-ray emission and the absence of an infrared
counterpart both suggest that this source is very deeply embedded.
|
[{'version': 'v1', 'created': 'Tue, 13 Nov 2007 16:02:15 GMT'}]
|
2009-11-13
|
[array(['Forbrich', 'Jan', ''], dtype=object)
array(['Menten', 'Karl M.', ''], dtype=object)
array(['Reid', 'Mark J.', ''], dtype=object)]
|
6,759 |
cond-mat/0008226
|
Yukito Iba
|
Yukito IBA
|
Population Monte Carlo algorithms
|
Title is changed (Population-based Monte Carlo -> Population Monte
Carlo). A number of small but important corrections and additions. References
are also added. Original Version is read at 2000 Workshop on
Information-Based Induction Sciences (July 17-18, 2000, Syuzenji, Shizuoka,
Japan). No figures
|
Transactions of the Japanese Society for Artificial Intelligence
Vol.16 No.2, pp.279-286
|
10.1527/tjsai.16.279
|
ISM Research Memo. No.757 (old version)
|
cond-mat.stat-mech cond-mat.dis-nn hep-lat
| null |
We give a cross-disciplinary survey on ``population'' Monte Carlo algorithms.
In these algorithms, a set of ``walkers'' or ``particles'' is used as a
representation of a high-dimensional vector. The computation is carried out by
a random walk and split/deletion of these objects. The algorithms are developed
in various fields in physics and statistical sciences and called by lots of
different terms -- ``quantum Monte Carlo'', ``transfer-matrix Monte Carlo'',
``Monte Carlo filter (particle filter)'',``sequential Monte Carlo'' and
``PERM'' etc. Here we discuss them in a coherent framework. We also touch on
related algorithms -- genetic algorithms and annealed importance sampling.
|
[{'version': 'v1', 'created': 'Wed, 16 Aug 2000 10:08:26 GMT'}
{'version': 'v2', 'created': 'Wed, 11 Apr 2001 12:26:20 GMT'}]
|
2015-06-24
|
[array(['IBA', 'Yukito', ''], dtype=object)]
|
6,760 |
1001.0458
|
Ahmad Ali Abdel-Wahhab
|
Ahmad T. Ali, Rafael Lopez and Melih Turgut
|
$k-$type partially null and pseudo null slant helices in Minkowski
4-space
|
12 pages and 2 figure
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce the notion of $k$-type slant helix in Minkowski space $\e_1^4$.
For partially null and pseudo null curves in $\e_1^4$, we express some
characterizations in terms of their curvature and torsion functions.
|
[{'version': 'v1', 'created': 'Mon, 4 Jan 2010 08:51:51 GMT'}]
|
2010-01-05
|
[array(['Ali', 'Ahmad T.', ''], dtype=object)
array(['Lopez', 'Rafael', ''], dtype=object)
array(['Turgut', 'Melih', ''], dtype=object)]
|
6,761 |
1302.6152
|
Evan Hohlfeld
|
Evan Hohlfeld
|
Coexistence of Scale-Invariant States in Incompressible Elastomers
|
5 pages, 1 figure + 9 pages of supplementary material
|
Phys. Rev. Lett. 111, 185701 (2013)
|
10.1103/PhysRevLett.111.185701
| null |
cond-mat.soft cond-mat.mtrl-sci cond-mat.stat-mech math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cavitation and sulcification of soft elastomers are two examples of
thresholdless, nonlinear instabilities that evade detection by linearization. I
show that the onset of such instabilities can be understood as a kind of phase
coexistence between multiple scale-invariant states, and I constructively
enumerate the possible scale-invariant states of incompressible rubber in two
dimensions. Whereas true phases (like the affine deformations of rubber) are
homogeneous, the alternatives are inhomogeneous. In terms of the thermodynamics
of solids, both classes of states must generally be given equal consideration.
|
[{'version': 'v1', 'created': 'Mon, 25 Feb 2013 16:51:48 GMT'}
{'version': 'v2', 'created': 'Wed, 11 Sep 2013 15:54:04 GMT'}
{'version': 'v3', 'created': 'Fri, 1 Nov 2013 17:03:16 GMT'}]
|
2013-11-04
|
[array(['Hohlfeld', 'Evan', ''], dtype=object)]
|
6,762 |
2110.04626
|
Rui Wang
|
Rui Wang, Jiahui Chen, Guo-Wei Wei
|
The evolution of the mechanisms of SARS-CoV-2 evolution revealing
vaccine-resistant mutations in Europe and America
|
11 pages, 4 figures
| null | null | null |
q-bio.PE
|
http://creativecommons.org/licenses/by/4.0/
|
The importance of understanding SARS-CoV-2 evolution cannot be
overemphasized. Recent studies confirm that natural selection is the dominating
mechanism of SARS-CoV-2 evolution, which favors mutations that strengthen viral
infectivity. We demonstrate that vaccine-breakthrough or antibody-resistant
mutations provide a new mechanism of viral evolution. Specifically,
vaccine-resistant mutation Y449S in the spike (S) protein receptor-bonding
domain (RBD), which occurred in co-mutation [Y449S, N501Y], has reduced
infectivity compared to the original SARS-CoV-2 but can disrupt existing
antibodies that neutralize the virus. By tracing the evolutionary trajectories
of vaccine-resistant mutations in over 1.9 million SARS-CoV-2 genomes, we
reveal that the occurrence and frequency of vaccine-resistant mutations
correlate strongly with the vaccination rates in Europe and America. We
anticipate that as a complementary transmission pathway, vaccine-resistant
mutations will become a dominating mechanism of SARS-CoV-2 evolution when most
of the world's population is vaccinated. Our study sheds light on SARS-CoV-2
evolution and transmission and enables the design of the next-generation
mutation-proof vaccines and antibody drugs.
|
[{'version': 'v1', 'created': 'Sat, 9 Oct 2021 18:24:29 GMT'}]
|
2021-10-12
|
[array(['Wang', 'Rui', ''], dtype=object)
array(['Chen', 'Jiahui', ''], dtype=object)
array(['Wei', 'Guo-Wei', ''], dtype=object)]
|
6,763 |
2112.03967
|
Timothy Burness
|
Timothy C. Burness, Robert M. Guralnick
|
Fixed point ratios for finite primitive groups and applications
|
66 pages; to appear in Adv. Math
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $G$ be a finite primitive permutation group on a set $\Omega$ and recall
that the fixed point ratio of an element $x \in G$, denoted ${\rm fpr}(x)$, is
the proportion of points in $\Omega$ fixed by $x$. Fixed point ratios in this
setting have been studied for many decades, finding a wide range of
applications. In this paper, we are interested in comparing ${\rm fpr}(x)$ with
the order of $x$. Our main theorem classifies the triples $(G,\Omega,x)$ as
above with the property that $x$ has prime order $r$ and ${\rm fpr}(x) >
1/(r+1)$. There are several applications. Firstly, we extend earlier work of
Guralnick and Magaard by determining the primitive permutation groups of degree
$m$ with minimal degree at most $2m/3$. Secondly, our main result plays a key
role in recent work of the authors (together with Moret\'{o} and Navarro) on
the commuting probability of $p$-elements in finite groups. Finally, we use our
main theorem to investigate the minimal index of a primitive permutation group,
which allows us to answer a question of Bhargava.
|
[{'version': 'v1', 'created': 'Tue, 7 Dec 2021 20:03:09 GMT'}
{'version': 'v2', 'created': 'Tue, 8 Nov 2022 16:34:40 GMT'}]
|
2022-11-09
|
[array(['Burness', 'Timothy C.', ''], dtype=object)
array(['Guralnick', 'Robert M.', ''], dtype=object)]
|
6,764 |
1711.04635
|
Efstratios Markou
|
Efstratios Markou
|
An intuitive proof of the Dvoretzky-Hanani theorem in R^2
| null | null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Dvoretzky-Hanani theorem states that the general term of any perfectly
divergent series in a finite dimensional space does not tend to zero. An
intuitive proof is provided R2 using a construction that allows us to determine
a choice of +/- such that $$a_1 +/- a_2 +/- a_3 +/- a_4... +/- a_n...$$
converges to a point in the space if ||a_i|| goes to 0. Extensions to the
construction are proposed for the general R^n.
|
[{'version': 'v1', 'created': 'Tue, 7 Nov 2017 19:42:37 GMT'}]
|
2017-11-15
|
[array(['Markou', 'Efstratios', ''], dtype=object)]
|
6,765 |
2303.10945
|
Junyang Chen
|
Junyang Chen, Xiaoyu Xian, Zhijing Yang, Tianshui Chen, Yongyi Lu,
Yukai Shi, Jinshan Pan, Liang Lin
|
Open-World Pose Transfer via Sequential Test-Time Adaption
|
We call for a solid pose transfer model that can handle open-world
instances beyond a specific dataset
| null | null | null |
cs.CV
|
http://creativecommons.org/licenses/by/4.0/
|
Pose transfer aims to transfer a given person into a specified posture, has
recently attracted considerable attention. A typical pose transfer framework
usually employs representative datasets to train a discriminative model, which
is often violated by out-of-distribution (OOD) instances. Recently, test-time
adaption (TTA) offers a feasible solution for OOD data by using a pre-trained
model that learns essential features with self-supervision. However, those
methods implicitly make an assumption that all test distributions have a
unified signal that can be learned directly. In open-world conditions, the pose
transfer task raises various independent signals: OOD appearance and skeleton,
which need to be extracted and distributed in speciality. To address this
point, we develop a SEquential Test-time Adaption (SETA). In the test-time
phrase, SETA extracts and distributes external appearance texture by augmenting
OOD data for self-supervised training. To make non-Euclidean similarity among
different postures explicit, SETA uses the image representations derived from a
person re-identification (Re-ID) model for similarity computation. By
addressing implicit posture representation in the test-time sequentially, SETA
greatly improves the generalization performance of current pose transfer
models. In our experiment, we first show that pose transfer can be applied to
open-world applications, including Tiktok reenactment and celebrity motion
synthesis.
|
[{'version': 'v1', 'created': 'Mon, 20 Mar 2023 09:01:23 GMT'}]
|
2023-03-21
|
[array(['Chen', 'Junyang', ''], dtype=object)
array(['Xian', 'Xiaoyu', ''], dtype=object)
array(['Yang', 'Zhijing', ''], dtype=object)
array(['Chen', 'Tianshui', ''], dtype=object)
array(['Lu', 'Yongyi', ''], dtype=object)
array(['Shi', 'Yukai', ''], dtype=object)
array(['Pan', 'Jinshan', ''], dtype=object)
array(['Lin', 'Liang', ''], dtype=object)]
|
6,766 |
2112.11303
|
Matthew Northey
|
Matthew Northey and Pankaj Vishe
|
On the Hasse principle for complete intersections
|
68 pages, 3 figures
| null | null | null |
math.NT math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove the Hasse principle for a smooth projective variety $X\subset
\PP^{n-1}_\Q$ defined by a system of two cubic forms $F,G$ as long as $n\geq
39$. The main tool here is the development of a version of Kloosterman
refinement for a smooth system of equations defined over $\Q$.
|
[{'version': 'v1', 'created': 'Tue, 21 Dec 2021 15:49:44 GMT'}]
|
2021-12-22
|
[array(['Northey', 'Matthew', ''], dtype=object)
array(['Vishe', 'Pankaj', ''], dtype=object)]
|
6,767 |
1405.5689
|
Srivatsan Ravi Mr
|
Dan Alistarh, Justin Kopinsky, Petr Kuznetsov, Srivatsan Ravi, Nir
Shavit
|
Inherent Limitations of Hybrid Transactional Memory
| null | null | null | null |
cs.DC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several Hybrid Transactional Memory (HyTM) schemes have recently been
proposed to complement the fast, but best-effort, nature of Hardware
Transactional Memory (HTM) with a slow, reliable software backup. However, the
fundamental limitations of building a HyTM with nontrivial concurrency between
hardware and software transactions are still not well understood.
In this paper, we propose a general model for HyTM implementations, which
captures the ability of hardware transactions to buffer memory accesses, and
allows us to formally quantify and analyze the amount of overhead
(instrumentation) of a HyTM scheme. We prove the following: (1) it is
impossible to build a strictly serializable HyTM implementation that has both
uninstrumented reads and writes, even for weak progress guarantees, and (2)
under reasonable assumptions, in any opaque progressive HyTM, a hardware
transaction must incur instrumentation costs linear in the size of its data
set. We further provide two upper bound implementations whose instrumentation
costs are optimal with respect to their progress guarantees. In sum, this paper
captures for the first time an inherent trade-off between the degree of
concurrency a HyTM provides between hardware and software transactions, and the
amount of instrumentation overhead the implementation must incur.
|
[{'version': 'v1', 'created': 'Thu, 22 May 2014 09:43:07 GMT'}
{'version': 'v2', 'created': 'Thu, 10 Jul 2014 13:05:47 GMT'}
{'version': 'v3', 'created': 'Tue, 17 Feb 2015 11:09:55 GMT'}]
|
2015-02-18
|
[array(['Alistarh', 'Dan', ''], dtype=object)
array(['Kopinsky', 'Justin', ''], dtype=object)
array(['Kuznetsov', 'Petr', ''], dtype=object)
array(['Ravi', 'Srivatsan', ''], dtype=object)
array(['Shavit', 'Nir', ''], dtype=object)]
|
6,768 |
1308.0321
|
Monika Aidelsburger
|
M. Aidelsburger, M. Atala, M. Lohse, J. T. Barreiro, B. Paredes and I.
Bloch
|
Realization of the Hofstadter Hamiltonian with ultracold atoms in
optical lattices
| null |
Phys. Rev. Lett. 111, 185301 (2013)
|
10.1103/PhysRevLett.111.185301
| null |
cond-mat.quant-gas cond-mat.str-el quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate the experimental implementation of an optical lattice that
allows for the generation of large homogeneous and tunable artificial magnetic
fields with ultracold atoms. Using laser-assisted tunneling in a tilted optical
potential we engineer spatially dependent complex tunneling amplitudes. Thereby
atoms hopping in the lattice accumulate a phase shift equivalent to the
Aharonov-Bohm phase of charged particles in a magnetic field. We determine the
local distribution of fluxes through the observation of cyclotron orbits of the
atoms on lattice plaquettes, showing that the system is described by the
Hofstadter model. Furthermore, we show that for two atomic spin states with
opposite magnetic moments, our system naturally realizes the time-reversal
symmetric Hamiltonian underlying the quantum spin Hall effect, i.e., two
different spin components experience opposite directions of the magnetic field.
|
[{'version': 'v1', 'created': 'Thu, 1 Aug 2013 19:53:35 GMT'}
{'version': 'v2', 'created': 'Sat, 7 Sep 2013 10:29:32 GMT'}]
|
2013-11-13
|
[array(['Aidelsburger', 'M.', ''], dtype=object)
array(['Atala', 'M.', ''], dtype=object)
array(['Lohse', 'M.', ''], dtype=object)
array(['Barreiro', 'J. T.', ''], dtype=object)
array(['Paredes', 'B.', ''], dtype=object)
array(['Bloch', 'I.', ''], dtype=object)]
|
6,769 |
1511.08478
|
Ives Rey-Otero
|
Ives Rey-Otero and Jean-Michel Morel and Mauricio Delbracio
|
An analysis of the factors affecting keypoint stability in scale-space
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The most popular image matching algorithm SIFT, introduced by D. Lowe a
decade ago, has proven to be sufficiently scale invariant to be used in
numerous applications. In practice, however, scale invariance may be weakened
by various sources of error inherent to the SIFT implementation affecting the
stability and accuracy of keypoint detection. The density of the sampling of
the Gaussian scale-space and the level of blur in the input image are two of
these sources. This article presents a numerical analysis of their impact on
the extracted keypoints stability. Such an analysis has both methodological and
practical implications, on how to compare feature detectors and on how to
improve SIFT. We show that even with a significantly oversampled scale-space
numerical errors prevent from achieving perfect stability. Usual strategies to
filter out unstable detections are shown to be inefficient. We also prove that
the effect of the error in the assumption on the initial blur is asymmetric and
that the method is strongly degraded in presence of aliasing or without a
correct assumption on the camera blur.
|
[{'version': 'v1', 'created': 'Thu, 26 Nov 2015 19:09:11 GMT'}]
|
2015-11-30
|
[array(['Rey-Otero', 'Ives', ''], dtype=object)
array(['Morel', 'Jean-Michel', ''], dtype=object)
array(['Delbracio', 'Mauricio', ''], dtype=object)]
|
6,770 |
1706.03449
|
Arman Cohan
|
Arman Cohan, Nazli Goharian
|
Scientific document summarization via citation contextualization and
scientific discourse
|
Preprint. The final publication is available at Springer via
http://dx.doi.org/10.1007/s00799-017-0216-8, International Journal on Digital
Libraries (IJDL) 2017
| null |
10.1007/s00799-017-0216-8
| null |
cs.CL cs.DL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The rapid growth of scientific literature has made it difficult for the
researchers to quickly learn about the developments in their respective fields.
Scientific document summarization addresses this challenge by providing
summaries of the important contributions of scientific papers. We present a
framework for scientific summarization which takes advantage of the citations
and the scientific discourse structure. Citation texts often lack the evidence
and context to support the content of the cited paper and are even sometimes
inaccurate. We first address the problem of inaccuracy of the citation texts by
finding the relevant context from the cited paper. We propose three approaches
for contextualizing citations which are based on query reformulation, word
embeddings, and supervised learning. We then train a model to identify the
discourse facets for each citation. We finally propose a method for summarizing
scientific papers by leveraging the faceted citations and their corresponding
contexts. We evaluate our proposed method on two scientific summarization
datasets in the biomedical and computational linguistics domains. Extensive
evaluation results show that our methods can improve over the state of the art
by large margins.
|
[{'version': 'v1', 'created': 'Mon, 12 Jun 2017 03:21:38 GMT'}]
|
2017-06-13
|
[array(['Cohan', 'Arman', ''], dtype=object)
array(['Goharian', 'Nazli', ''], dtype=object)]
|
6,771 |
2303.01842
|
Joshua Davy
|
Joshua Davy, Tomas da Veiga, Giovanni Pittiglio, James H. Chandler and
Pietro Valdastri
|
Independent Control of Two Magnetic Robots using External Permanent
Magnets: A Feasibility Study
|
7 pages, 6 figures, conference
| null | null | null |
cs.RO
|
http://creativecommons.org/licenses/by/4.0/
|
The ability to have multiple magnetic robots operate independently in the
same workspace would increase the clinical potential of these systems allowing
collaborative operation. In this work, we investigate the feasibility of
actuating two magnetic robots operating within the same workspace using
external permanent magnets. Unlike actuation systems based on pairs of
electromagnetic coils, the use of multiple permanent magnets comes with the
advantage of a large workspace which better suits the clinical setting. In this
work, we present an optimization routine capable of generating the required
poses for the external magnets in order to control the position and orientation
of two magnetic robots. We show that at a distance of 15cm, minimal coupling
between the magnetic robots can be achieved (3.9\% crosstalk) each embedded
with 5mm diameter, 5mm length NdFeB magnets. At smaller distances, we observe
that the ability to independently control the robot torques decreases, but
forces can still achieve independent control even with alignment of the robots.
We test our developed control system in a simulation of two magnetic robots
following pre-planned trajectories in close proximity (60 mm) showing a mean
positional error of 8.7 mm and mean angular error of 16.7 degrees.
|
[{'version': 'v1', 'created': 'Fri, 3 Mar 2023 10:51:06 GMT'}]
|
2023-03-06
|
[array(['Davy', 'Joshua', ''], dtype=object)
array(['da Veiga', 'Tomas', ''], dtype=object)
array(['Pittiglio', 'Giovanni', ''], dtype=object)
array(['Chandler', 'James H.', ''], dtype=object)
array(['Valdastri', 'Pietro', ''], dtype=object)]
|
6,772 |
1702.03184
|
David Long
|
Carlos Francile, Fernando M. L\'opez, Hebe Cremades, Cristina H.
Mandrini, Mar\'ia Luisa Luoni, David M. Long
|
Moreton and EUV Waves Associated with an X1.0 Flare and CME Ejection
|
37 pages, 14 Figures, published in Solar Physics
|
Solar Physics, Volume 291, Issue 11, pp.3217-3249 (2016)
|
10.1007/s11207-016-0978-y
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A Moreton wave was detected in active region (AR) 12017 on 29 March 2014 with
very high cadence with the Halpha Solar Telescope for Argentina (HASTA) in
association with an X1.0 flare (SOL2014-03-29T17:48). Several other phenomena
took place in connection with this event, such as low coronal waves and a
coronal mass ejection (CME). We analyze the association between the Moreton
wave and the EUV signatures observed with the Atmospheric Imaging Assembly
onboard the Solar Dynamics Observatory. These include their low-coronal
surface-imprint, and the signatures of the full wave and shock dome propagating
outward in the corona. We also study their relation to the white-light CME. We
perform a kinematic analysis by tracking the wavefronts in several directions.
This analysis reveals a high-directional dependence of accelerations and speeds
determined from data at various wavelengths. We speculate that a region of open
magnetic field lines northward of our defined radiant point sets favorable
conditions for the propagation of a coronal magnetohydrodynamic shock in this
direction. The hypothesis that the Moreton wavefront is produced by a coronal
shock-wave that pushes the chromosphere downward is supported by the high
compression ratio in that region. Furthermore, we propose a 3D geometrical
model to explain the observed wavefronts as the chromospheric and low-coronal
traces of an expanding and outward-traveling bubble intersecting the Sun. The
results of the model are in agreement with the coronal shock-wave being
generated by a 3D piston that expands at the speed of the associated rising
filament. The piston is attributed to the fast ejection of the filament-CME
ensemble, also consistent with the good match between the speed profiles of the
low-coronal and white-light shock-waves.
|
[{'version': 'v1', 'created': 'Fri, 10 Feb 2017 14:35:23 GMT'}]
|
2017-02-13
|
[array(['Francile', 'Carlos', ''], dtype=object)
array(['López', 'Fernando M.', ''], dtype=object)
array(['Cremades', 'Hebe', ''], dtype=object)
array(['Mandrini', 'Cristina H.', ''], dtype=object)
array(['Luoni', 'María Luisa', ''], dtype=object)
array(['Long', 'David M.', ''], dtype=object)]
|
6,773 |
quant-ph/9907026
|
Thomas Konrad
|
J. Audretsch, Th. Konrad, M. Mensky
|
Approximate real time visualization of a Rabi transition by means of
continuous fuzzy measurement
|
17 pages, 6 figures
| null | null | null |
quant-ph
| null |
Continuous weak or fuzzy measurement of the Rabi oscillation of a two level
atom subjected to a $\pi-$pulse of a resonant light field is simulated
numerically. We thereby address the question whether it is possible to measure
characteristic features of the motion of the state of a single quantum system
in real time. We compare two schemes of continuous measurement: continuous
measurement with constant fuzziness and with fuzziness changing in the course
of the measurement. Because the sensitivity of the Rabi atom to the influence
of the measurement depends on the state of the atom, it is possible to optimize
the continuous fuzzy measurement by varying its fuzziness.
|
[{'version': 'v1', 'created': 'Thu, 8 Jul 1999 08:22:26 GMT'}]
|
2007-05-23
|
[array(['Audretsch', 'J.', ''], dtype=object)
array(['Konrad', 'Th.', ''], dtype=object)
array(['Mensky', 'M.', ''], dtype=object)]
|
6,774 |
2111.13304
|
G\'abor Erd\'elyi
|
G\'abor Erd\'elyi, Olivia J. Erd\'elyi, and Andreas W. Kempa-Liehr
|
Data Fusion Challenges Privacy: What Can Privacy Regulation Do?
|
19 pages
| null | null | null |
cs.CY cs.AI cs.CR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper focuses on some shortcomings in current privacy and data
protection regulations' ability to adequately address the ramifications of
AI-driven data processing practices, in particular where data sets are combined
and processed by AI systems. We raise attention to two regulatory anomalies
related to two fundamental assumptions underlying traditional privacy and data
protection approaches: (1) Only Personally Identifiable Information (PII) and
Personal Data (PD) require privacy protection: Privacy and data protection
regulations are only triggered with respect to PII/PD, but not anonymous data.
This is not only problematic because determining whether data falls in the
former or latter category is no longer straightforward, but also because
privacy risks associated with data processing may exist whether or not an
individual can be identified. (2) Given sufficient information provided in a
transparent and understandable manner, individuals are able to adequately
assess the privacy implications of their actions and protect their privacy
interests: However, relying on human privacy expectations fails to address
important privacy threats, because those expectations are at odds with the
actual privacy implications of data processing practices, as most people lack
the necessary technical literacy to understand the sophisticated technologies
at play, and to correctly assess their privacy implications. To tackle these
anomalies we recommend regulatory reform in two directions: (1) Abolishing the
distinction between personal and anonymized data for the purposes of triggering
the application of privacy and data protection regulations and (2) developing
methods to prioritize regulatory intervention based on the level of privacy
risk posed by individual data processing actions.
|
[{'version': 'v1', 'created': 'Fri, 26 Nov 2021 03:30:11 GMT'}
{'version': 'v2', 'created': 'Fri, 26 Aug 2022 00:07:39 GMT'}
{'version': 'v3', 'created': 'Fri, 25 Nov 2022 13:36:27 GMT'}
{'version': 'v4', 'created': 'Tue, 17 Jan 2023 02:03:05 GMT'}]
|
2023-01-18
|
[array(['Erdélyi', 'Gábor', ''], dtype=object)
array(['Erdélyi', 'Olivia J.', ''], dtype=object)
array(['Kempa-Liehr', 'Andreas W.', ''], dtype=object)]
|
6,775 |
1405.1781
|
Arka Bhattacharya
|
Arka Bhattacharya
|
Approximation Algorithms for the Asymmetric Traveling Salesman Problem :
Describing two recent methods
|
12 pages
| null | null | null |
cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper provides a description of the two recent approximation algorithms
for the Asymmetric Traveling Salesman Problem, giving the intuitive description
of the works of Feige-Singh[1] and Asadpour et.al\ [2].\newline [1] improves
the previous $O(\log n)$ approximation algorithm, by improving the constant
from 0.84 to 0.66 and modifying the work of Kaplan et. al\ [3] and also shows
an efficient reduction from ATSPP to ATSP. Combining both the results, they
finally establish an approximation ratio of $\left(\frac{4}{3}+\epsilon
\right)\log n$ for ATSPP,\ considering a small $\epsilon>0$,\ improving the
work of Chekuri and Pal.[4]\newline Asadpour et.al, in their seminal work\ [2],
gives an $O\left(\frac{\log n}{\log \log n}\right)$ randomized algorithm for
the ATSP, by symmetrizing and modifying the solution of the Held-Karp
relaxation problem and then proving an exponential family distribution for
probabilistically constructing a maximum entropy spanning tree from a spanning
tree polytope and then finally defining the thin-ness property and transforming
a thin spanning tree into an Eulerian walk.\ The optimization methods used in\
[2] are quite elegant and the approximation ratio could further be improved, by
manipulating the thin-ness of the cuts.
|
[{'version': 'v1', 'created': 'Thu, 8 May 2014 00:10:56 GMT'}]
|
2014-05-09
|
[array(['Bhattacharya', 'Arka', ''], dtype=object)]
|
6,776 |
1605.05994
|
Bret Benesh
|
Bret J. Benesh
|
On two questions by Finch and Jones about perfect order subset groups
|
1 page
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A finite group G is said to be a POS-group if the number of elements of every
order occurring in G divides |G|. We answer two questions by Finch and Jones by
providing an infinite family of nonabelian POS-groups with orders not divisible
by 3.
|
[{'version': 'v1', 'created': 'Wed, 18 May 2016 17:02:36 GMT'}]
|
2016-05-20
|
[array(['Benesh', 'Bret J.', ''], dtype=object)]
|
6,777 |
hep-ph/9707315
|
Sourendu Gupta
|
Sourendu Gupta
|
Single Polarisation Asymmetries for Quarkonia in Non-relativistic QCD
|
Plain LaTeX with one figure (ps)
|
Phys. Rev. D 57, 1858 (1998)
|
10.1103/PhysRevD.57.1858
|
TIFR/TH/97-36
|
hep-ph
| null |
We find that single spin asymmetries in NRQCD are non-vanishing in general.
They are proportional to the imaginary parts of some non-perturbative matrix
elements. With statistics of about 10^6 identified J/psi's, or 10^5 identified
chi_2, it is possible to measure these imaginary parts even if they are an
order of magnitude smaller than the real parts. Such statistics are quite
reasonable at polarised HERA N and other future experiments.
|
[{'version': 'v1', 'created': 'Fri, 11 Jul 1997 20:09:39 GMT'}]
|
2016-08-25
|
[array(['Gupta', 'Sourendu', ''], dtype=object)]
|
6,778 |
2007.05530
|
M\'elissa D. Menu
|
M\'elissa D. Menu, Ludovic Petitdemange, S\'ebastien Galtier
|
Magnetic effects on fields morphologies and reversals in geodynamo
simulations
| null | null |
10.1016/j.pepi.2020.106542
| null |
physics.flu-dyn astro-ph.EP physics.geo-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dynamo effect is the most popular candidate to explain the non-primordial
magnetic fields of astrophysical objects. Although many systematic studies of
parameters have already been made to determine the different dynamical regimes
explored by direct numerical geodynamo simulations, it is only recently that
the regime corresponding to the outer core of the Earth characterized by a
balance of forces between the Coriolis and Lorentz forces is accessible
numerically. In most previous studies, the Lorentz force played a relatively
minor role. For example, they have shown that a purely hydrodynamic parameter
(the local Rossby number $Ro_\ell$ determines the stability domain of dynamos
dominated by the axial dipole (dipolar dynamos).
In this study, we show that this result cannot hold when the Lorentz force
becomes dominant. We model turbulent geodynamo simulations with a strong
Lorentz force by varying the important parameters over several orders of
magnitude. This method enables us to question previous results and to argue on
the applications of numerical dynamos in order to better understand the
geodynamo problem. Strong dipolar fields considerably affect the kinetic energy
distribution of convective motions which enables the maintenance of this field
configuration. The relative importance of each force depends on the spatial
length scale, whereas $Ro_\ell$ is a global output parameter which ignores the
spatial dependency. We show that inertia does not induce a dipole collapse as
long as the Lorentz and the Coriolis forces remain dominant at large length
scales.
|
[{'version': 'v1', 'created': 'Fri, 10 Jul 2020 12:54:04 GMT'}]
|
2020-07-14
|
[array(['Menu', 'Mélissa D.', ''], dtype=object)
array(['Petitdemange', 'Ludovic', ''], dtype=object)
array(['Galtier', 'Sébastien', ''], dtype=object)]
|
6,779 |
2009.02857
|
Dongho Choi
|
Dongho Choi
|
3D Room Layout Estimation Beyond the Manhattan World Assumption
|
3rd Place @ ECCV 2020 Holistic Scene Structures for 3D Vision
Workshop Challenges Track 1; 6 pages with 3 figures and 2 tables
| null | null | null |
cs.CV cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Predicting 3D room layout from single image is a challenging task with many
applications. In this paper, we propose a new training and post-processing
method for 3D room layout estimation, built on a recent state-of-the-art 3D
room layout estimation model. Experimental results show our method outperforms
state-of-the-art approaches by a large margin in predicting visible room
layout. Our method has obtained the 3rd place in 2020 Holistic Scene Structures
for 3D Vision Workshop.
|
[{'version': 'v1', 'created': 'Mon, 7 Sep 2020 02:14:29 GMT'}]
|
2020-09-08
|
[array(['Choi', 'Dongho', ''], dtype=object)]
|
6,780 |
1101.0336
|
Yu-Xiao Liu
|
Chun-E Fu, Yu-Xiao Liu, Heng Guo
|
Bulk matter fields on two-field thick branes
|
22 pages, 8 figures, improved version, accepted by Physical Review D
|
Phys.Rev.D84:044036,2011
|
10.1103/PhysRevD.84.044036
| null |
hep-th gr-qc hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we obtain a new solution of a brane made up of a scalar field
coupled to a dilaton. There is a unique parameter $b$ in the solution, which
decides the distribution of the energy density and will effect the localization
of bulk matter fields. For free vector fields, we find that the zero mode can
be localized on the brane. And for vector fields coupled with the dilaton via
$\text{e}^{\tau\pi}F_{MN}F^{MN}$, the condition for localizing the zero mode is
$\tau\geq-\sqrt{b/3}$ with $0<b\leq1$, or $\tau>-1/\sqrt{3b}$ with $b>1$, which
includes the case $\tau=0$. While the zero mode for free Kalb-Ramond fields can
not be localized on the brane, if only we introduce a coupling between the
Kalb-Ramond fields and the dilaton via $\text{e}^{\zeta \pi}H_{MNL}H^{MNL}$.
When the coupling constant satisfies $\zeta>1/\sqrt{3b}$ with $b\geq1$ or
$\zeta>\frac{2-b}{\sqrt{3b}}$ with $0<b<1$, the zero mode for the KR fields can
be localized on the brane. For spin half fermion fields, we consider the
coupling $\eta\bar{\Psi}\text{e}^{\lambda \pi}\phi\Psi$ between the fermions
and the background scalars with positive Yukawa coupling $\eta$. The effective
potentials for both chiral fermions have three types of shapes decided by the
relation between the dilaton-fermion coupling constant $\lambda$ and the
parameter $b$. For $\lambda\leq-1/\sqrt{3b}$, the zero mode of left-chiral
fermion can be localized on the brane. While for $\lambda>-1/\sqrt{3b}$ with
$b>1$ or $-1/\sqrt{3b}<\lambda<-\sqrt{b/3}$ with $0<b\leq1$, the zero mode for
left-chiral fermion also can be localized.
|
[{'version': 'v1', 'created': 'Sat, 1 Jan 2011 13:23:25 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Feb 2011 10:14:05 GMT'}
{'version': 'v3', 'created': 'Fri, 20 May 2011 07:54:46 GMT'}
{'version': 'v4', 'created': 'Thu, 28 Jul 2011 02:06:43 GMT'}]
|
2015-03-17
|
[array(['Fu', 'Chun-E', ''], dtype=object)
array(['Liu', 'Yu-Xiao', ''], dtype=object)
array(['Guo', 'Heng', ''], dtype=object)]
|
6,781 |
1401.5824
|
Hung-Wei Yen
|
Hung-Wei Yen, Steve Woei Ooi, Mehdi Eizadjou, Andrew Breen, Ching-Yuan
Huang, H. K. D. H. Bhadeshia, and Simon P. Ringer
|
Role of stress-assisted martensite in the design of strong
ultrafine-grained duplex steels
|
We've updated a correct manuscript
|
Acta Materialia, Vol.82, pp. 100-114, 2015
|
10.1016/j.actamat.2014.09.017
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This work explains the occurrence of transformation-induced plasticity via
stress-assisted martensite, when designing ultrafine-grained duplex steels. It
is found that, when the austenite is reduced to a fine scale of about 300 nm,
the initial deformation-induced microstructure can be dominated by parallel
lamellae of epsilon martensite or mechanical twinning, which cannot efficiently
provide nucleation sites for strain-induced martensite. Hence, alpha martensite
nucleation occurs independently by a stress-assisted process that enhances
transformation-induced plasticity in ultrafine-grained austenite. This
metallurgical principle was validated experimentally by using a combination of
transmission Kikuchi diffraction mapping, transmission electron microscopy, and
atom probe microscopy, and demonstrated theoretically by the thermodynamics
model of stress-assisted martensite.
|
[{'version': 'v1', 'created': 'Wed, 22 Jan 2014 23:07:02 GMT'}
{'version': 'v2', 'created': 'Mon, 3 Feb 2014 05:07:21 GMT'}
{'version': 'v3', 'created': 'Wed, 5 Nov 2014 02:50:39 GMT'}]
|
2014-11-06
|
[array(['Yen', 'Hung-Wei', ''], dtype=object)
array(['Ooi', 'Steve Woei', ''], dtype=object)
array(['Eizadjou', 'Mehdi', ''], dtype=object)
array(['Breen', 'Andrew', ''], dtype=object)
array(['Huang', 'Ching-Yuan', ''], dtype=object)
array(['Bhadeshia', 'H. K. D. H.', ''], dtype=object)
array(['Ringer', 'Simon P.', ''], dtype=object)]
|
6,782 |
2201.04071
|
Dr. Sudhaker Upadhyay
|
J. Sadeghi, B. Pourhassan, S. Noori Gashti and S. Upadhyay
|
Weak Gravity Conjecture, Black Branes and Violations of Universal
Thermodynamic Relation
|
14 pages; 2 captioned figures
|
Annals of Physics 447 (2022) 169168
|
10.1016/j.aop.2022.169168
| null |
gr-qc hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
The universal thermodynamic relations between corrections to entropy and
extremality for various black holes solutions have been studied. In this
regard, we hereby consider a number of different black brane solutions in
different structures for perturbative corrections to general relativity. These
are, namely, black brane solution in Rastall AdS massive gravity,
Einstein-Yang-Mills AdS black brane solution in massive gravity and general
anisotropic black brane in Horava-Lifshitz gravity. We calculate both the
entropy and extremality bound by introducing a small constant correction to the
action. Remarkably, we find that black brane violates the universal
thermodynamic relations. In other words, a universal relation between
corrections to entropy and extremality are not valid in the black brane
structure.
|
[{'version': 'v1', 'created': 'Mon, 10 Jan 2022 16:18:34 GMT'}]
|
2022-11-22
|
[array(['Sadeghi', 'J.', ''], dtype=object)
array(['Pourhassan', 'B.', ''], dtype=object)
array(['Gashti', 'S. Noori', ''], dtype=object)
array(['Upadhyay', 'S.', ''], dtype=object)]
|
6,783 |
2305.18859
|
Jan Mrkos
|
David Fiedler and Jan Mrkos
|
Large-scale Ridesharing DARP Instances Based on Real Travel Demand
|
8 pages, 9 figures. Submitted to 26th IEEE International Conference
on Intelligent Transportation Systems ITSC 2023. For the published associated
dataset and source codes, see the repository
https://github.com/aicenter/Ridesharing_DARP_instances
| null | null | null |
cs.AI math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Accurately predicting the real-life performance of algorithms solving the
Dial-a-Ride Problem (DARP) in the context of Mobility on Demand (MoD) systems
with ridesharing requires evaluating them on representative instances. However,
the benchmarking of state-of-the-art DARP solution methods has been limited to
small, artificial instances or outdated non-public instances, hindering direct
comparisons. With the rise of large MoD systems and the availability of open
travel demand datasets for many US cities, there is now an opportunity to
evaluate these algorithms on standardized, realistic, and representative
instances. Despite the significant challenges involved in processing obfuscated
and diverse datasets, we have developed a methodology using which we have
created a comprehensive set of large-scale demand instances based on real-world
data. These instances cover diverse use cases, one of which is demonstrated in
an evaluation of two established DARP methods: the insertion heuristic and
optimal vehicle-group assignment method. We publish the full results of both
methods in a standardized format. The results show significant differences
between areas in all measured quantities, emphasizing the importance of
evaluating methods across different cities.
|
[{'version': 'v1', 'created': 'Tue, 30 May 2023 08:51:11 GMT'}]
|
2023-05-31
|
[array(['Fiedler', 'David', ''], dtype=object)
array(['Mrkos', 'Jan', ''], dtype=object)]
|
6,784 |
cond-mat/9510050
|
E. Canessa
|
N.C. Pesheva, J.G. Brankov, E. Canessa
|
Layer Features of the Lattice Gas Model for Self-Organized Criticality
|
LaTeX, figures upon request
| null |
10.1103/PhysRevE.53.2099
|
ICTP-IC/95/95
|
cond-mat
| null |
A layer-by-layer description of the asymmetric lattice gas model for
1/f-noise suggested by Jensen [Phys. Rev. Lett. 64, 3103 (1990)] is presented.
The power spectra of the lattice layers in the direction perpendicular to the
particle flux is studied in order to understand how the white noise at the
input boundary evolves, on the average, into 1/f-noise for the system. The
effects of high boundary drive and uniform driving force on the power spectrum
of the total number of diffusing particles are considered. In the case of
nearest-neighbor particle interactions, high statistics simulation results show
that the power spectra of single lattice layers are characterized by different
$\beta_x$ exponents such that $\beta_x \to 1.9$ as one approaches the outer
boundary.
|
[{'version': 'v1', 'created': 'Wed, 11 Oct 1995 10:45:00 GMT'}]
|
2009-10-28
|
[array(['Pesheva', 'N. C.', ''], dtype=object)
array(['Brankov', 'J. G.', ''], dtype=object)
array(['Canessa', 'E.', ''], dtype=object)]
|
6,785 |
0807.2051
|
Sa\v{s}a Iliji\'c
|
Dubravko Horvat, Sasa Ilijic, Anja Marunovic
|
Electrically charged gravastar configurations
|
LaTeX, 14 pages, 3 figs, changes wrt v1: discussion of emergent
equation of state included and references updated (to appear in CQG)
|
Class.Quant.Grav.26:025003,2009
|
10.1088/0264-9381/26/2/025003
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The notion of a compact object immune to the horizon problem and comprising
an anisotropic inhomogeneous fluid with a specific radial pressure behavior,
i.e. the gravastar, is extended by introducing an electrically charged
component. Einstein-Maxwell field equations are solved in the asymptotically de
Sitter interior where a source of the electric field is coupled to the fluid
energy density. Two different solutions which satisfy the dominant energy
condition are given: one is the delta-shell model for which the analysis is
carried out within Israel's thin shell formalism, the other approach - the
continuous profile model - is solved numerically and the interior solutions
have been (smoothly) joined with the Reissner-Nordstrom exterior. The effect of
electric charge is considered, and the equation of state, the speed of sound
and the surface redshift are calculated for both models.
|
[{'version': 'v1', 'created': 'Sun, 13 Jul 2008 18:38:06 GMT'}
{'version': 'v2', 'created': 'Tue, 2 Dec 2008 08:49:45 GMT'}]
|
2009-01-16
|
[array(['Horvat', 'Dubravko', ''], dtype=object)
array(['Ilijic', 'Sasa', ''], dtype=object)
array(['Marunovic', 'Anja', ''], dtype=object)]
|
6,786 |
1510.05498
|
Brian Chan BSc Honours
|
Brian T. Chan
|
A Sufficient Condition for J\'onsson's Conjecture and its Relationship
with Finite Semidistributive lattices
| null | null | null | null |
math.RA
|
http://creativecommons.org/licenses/by/4.0/
|
This article is part of my upcoming masters thesis which investigates the
following open problem from the book, Free Lattices, by R.Freese, J.Jezek, and
J.B. Nation published in 1995: "Which lattices (and in particular which
countable lattices) are sublattices of a free lattice?"
Despite partial progress over the decades, the problem is still unsolved.
There is emphasis on the countable case because the current body of knowledge
on sublattices of free lattices is most concentrated on when these sublattices
are countably infinite.
It is known that sublattices of free lattices which are finite can be
characterized as being those lattices which satisfy Whitman's condition and are
semidistributive. This assertion was conjectured by B. Jonsson in the 1960's
and proven by J.B. Nation in 1980. However, there is a desire for a new proof
to this deep result as Nation's proof is very involved and more insight into
sublattices of free lattices is sought after.
In this article, a sufficient condition involving a construct known as a join
minimal pair, or just a minimal pair, implying J'onsson's conjecture is proven.
Minimal pairs were first defined by H. Gaskill when analysing sharply
transferable lattices. Using this sufficient condition, research by I.Rival and
B.Sands is used to compare this condition with properties of finite
semidistributive lattices and in the process refute the main assertion of a
manuscript by H.Muhle. Moreover, inspired by the approaches used by Henri
Muhle, I will make a partial result which investigates a possible forbidden
sublattice characterization involving breadth-two planar semidistributive
lattices. To the best of my knowledge, the two results of this article (the
sufficient condition for Jonsson's conjecture and the partial result
aforementioned) are new.
|
[{'version': 'v1', 'created': 'Mon, 19 Oct 2015 14:43:52 GMT'}]
|
2015-10-20
|
[array(['Chan', 'Brian T.', ''], dtype=object)]
|
6,787 |
0808.1759
|
Abraham Nitzan
|
Boris Fainberg and Abraham Nitzan
|
Rabi oscillations and photocurrent in quantum-dot tunnelling junctions
|
4 pages, two figures. Physica Status Solidi, in press
|
Phys. Status Solidi A 206, No.5, pp.948-951 (2009)
|
10.1002/pssa.200881287
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the experiments by Zrenner et al. [Nature 418, 612 (2002)], we
study the influence of relaxation processes on converting Rabi oscillations in
a strongly biased single-quantum-dot photodiode into deterministic
photocurrents. We show that the behavior of a quantum dot with different tunnel
rates for electron and holes is qualitatively different from that with the
equal tunnel rates: in the latter case the current shows attenuating
oscillations with the Rabi frequency. In contrast, for different electrons and
holes tunnelling rates, the frequency of these oscillations diminishes, and
they disappear beyond a definite asymmetry threshold. We give an analytical
solution of the problem and a numerical example showing a different behaviour
of the transferred charge in the small attenuation limit for equal and
different tunnel rates for electrons and holes.
|
[{'version': 'v1', 'created': 'Tue, 12 Aug 2008 23:59:28 GMT'}
{'version': 'v2', 'created': 'Thu, 27 Nov 2008 05:37:19 GMT'}]
|
2010-01-26
|
[array(['Fainberg', 'Boris', ''], dtype=object)
array(['Nitzan', 'Abraham', ''], dtype=object)]
|
6,788 |
2108.00198
|
Torsten Ueckerdt
|
Torsten Ueckerdt and David R. Wood and Wendy Yi
|
An improved planar graph product structure theorem
|
arXiv admin note: text overlap with arXiv:1904.04791
| null | null | null |
math.CO cs.DM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dujmovi\'c, Joret, Micek, Morin, Ueckerdt and Wood [J. ACM 2020] proved that
for every planar graph $G$ there is a graph $H$ with treewidth at most 8 and a
path $P$ such that $G\subseteq H\boxtimes P$. We improve this result by
replacing "treewidth at most 8" by "simple treewidth at most 6".
|
[{'version': 'v1', 'created': 'Sat, 31 Jul 2021 09:52:07 GMT'}]
|
2021-08-21
|
[array(['Ueckerdt', 'Torsten', ''], dtype=object)
array(['Wood', 'David R.', ''], dtype=object)
array(['Yi', 'Wendy', ''], dtype=object)]
|
6,789 |
1201.5572
|
Thomas Becher
|
Thomas Becher, Guido Bell and Stefanie Marti
|
NNLO soft function for electroweak boson production at large transverse
momentum
|
16 pages, 3 figures
| null |
10.1007/JHEP04(2012)034
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The soft function relevant for the production of an electroweak boson
(photon, W, Z or H) with large transverse momentum at a hadron collider is
computed at next-to-next-to-leading order. This is the first two-loop
computation of a soft function involving three light-cone directions. With the
result, the threshold resummation for these processes can now be performed at
next-to-next-to-next-to-leading logarithmic accuracy.
|
[{'version': 'v1', 'created': 'Thu, 26 Jan 2012 16:35:14 GMT'}]
|
2015-06-03
|
[array(['Becher', 'Thomas', ''], dtype=object)
array(['Bell', 'Guido', ''], dtype=object)
array(['Marti', 'Stefanie', ''], dtype=object)]
|
6,790 |
2305.01993
|
Giannos Stamoulis
|
Fedor V. Fomin, Petr A. Golovach, Tuukka Korhonen, Giannos Stamoulis
|
Computing paths of large rank in planar frameworks deterministically
|
26 pages, 6 figures
| null | null | null |
cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A framework consists of an undirected graph $G$ and a matroid $M$ whose
elements correspond to the vertices of $G$. Recently, Fomin et al. [SODA 2023]
and Eiben et al. [ArXiV 2023] developed parameterized algorithms for computing
paths of rank $k$ in frameworks. More precisely, for vertices $s$ and $t$ of
$G$, and an integer $k$, they gave FPT algorithms parameterized by $k$ deciding
whether there is an $(s,t)$-path in $G$ whose vertex set contains a subset of
elements of $M$ of rank $k$. These algorithms are based on Schwartz-Zippel
lemma for polynomial identity testing and thus are randomized, and therefore
the existence of a deterministic FPT algorithm for this problem remains open.
We present the first deterministic FPT algorithm that solves the problem in
frameworks whose underlying graph $G$ is planar. While the running time of our
algorithm is worse than the running times of the recent randomized algorithms,
our algorithm works on more general classes of matroids. In particular, this is
the first FPT algorithm for the case when matroid $M$ is represented over
rationals. Our main technical contribution is the nontrivial adaptation of the
classic irrelevant vertex technique to frameworks to reduce the given instance
to one of bounded treewidth. This allows us to employ the toolbox of
representative sets to design a dynamic programming procedure solving the
problem efficiently on instances of bounded treewidth.
|
[{'version': 'v1', 'created': 'Wed, 3 May 2023 09:27:12 GMT'}]
|
2023-05-04
|
[array(['Fomin', 'Fedor V.', ''], dtype=object)
array(['Golovach', 'Petr A.', ''], dtype=object)
array(['Korhonen', 'Tuukka', ''], dtype=object)
array(['Stamoulis', 'Giannos', ''], dtype=object)]
|
6,791 |
2102.12299
|
Jennifer Loria Sorio
|
Vinicius V. L. Albani, Jennifer Loria, Eduardo Massad and Jorge P.
Zubelli
|
The Impact of COVID-19 Vaccination Delay: A Modelling Study for Chicago
and NYC Data
|
21 pages, 6 figures, 3 tables
| null | null | null |
q-bio.PE
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Background: By the beginning of December 2020, some vaccines against COVID-19
already presented efficacy and security, which qualify them to be used in mass
vaccination campaigns. Thus, setting up strategies of vaccination became
crucial to control the COVID19 pandemic. Methods: We use daily COVID-19 reports
from Chicago and NYC from 01-Mar2020 to 28- Nov-2020 to estimate the parameters
of an SEIR-like epidemiological model that accounts for different severity
levels. To achieve data adherent predictions, we let the model parameters to be
time-dependent. The model is used to forecast different vaccination scenarios,
where the campaign starts at different dates, from 01-Oct-2020 to 01-Apr-2021.
To generate realistic scenarios, disease control strategies are implemented
whenever the number of predicted daily hospitalizations reaches a preset
threshold. Results: The model reproduces the empirical data with remarkable
accuracy. Delaying the vaccination severely affects the mortality,
hospitalization, and recovery projections. In Chicago, the disease spread was
under control, reducing the mortality increment as the start of the vaccination
was postponed. In NYC, the number of cases was increasing, thus, the estimated
model predicted a much larger impact, despite the implementation of contention
measures. The earlier the vaccination campaign begins, the larger is its
potential impact in reducing the COVID-19 cases, as well as in the
hospitalizations and deaths. Moreover, the rate at which cases,
hospitalizations and deaths increase with the delay in the vaccination
beginning strongly depends on the shape of the incidence of infection in each
city.
|
[{'version': 'v1', 'created': 'Wed, 24 Feb 2021 14:29:30 GMT'}]
|
2021-02-25
|
[array(['Albani', 'Vinicius V. L.', ''], dtype=object)
array(['Loria', 'Jennifer', ''], dtype=object)
array(['Massad', 'Eduardo', ''], dtype=object)
array(['Zubelli', 'Jorge P.', ''], dtype=object)]
|
6,792 |
1808.00272
|
Samuel Corson
|
Samuel M. Corson
|
Automatic continuity of $\aleph_1$-free groups
| null |
Israel J. Math 237 (2020), 267-285
|
10.1007/s11856-020-2006-z
| null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that groups for which every countable subgroup is free
($\aleph_1$-free groups) are n-slender, cm-slender, and lcH-slender. In
particular every homomorphism from a completely metrizable group to an
$\aleph_1$-free group has an open kernel. We also show that $\aleph_1$-free
abelian groups are lcH-slender, which is especially interesting in light of the
fact that some $\aleph_1$-free abelian groups are neither n- nor cm-slender.
The strongly $\aleph_1$-free abelian groups are shown to be n-, cm-, and
lcH-slender. We also give a characterization of cm- and lcH-slender abelian
groups.
|
[{'version': 'v1', 'created': 'Wed, 1 Aug 2018 11:20:09 GMT'}]
|
2020-12-11
|
[array(['Corson', 'Samuel M.', ''], dtype=object)]
|
6,793 |
2009.01728
|
Gabriele Franciolini
|
V. De Luca, V. Desjacques, G. Franciolini, P. Pani and A. Riotto
|
The GW190521 Mass Gap Event and the Primordial Black Hole Scenario
|
7 pages, 4 figures. v2: matching version published in PRL
|
Phys. Rev. Lett. 126, 051101 (2021)
|
10.1103/PhysRevLett.126.051101
| null |
astro-ph.CO gr-qc hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LIGO/Virgo Collaboration has recently observed GW190521, the first binary
black hole merger with at least the primary component mass in the mass gap
predicted by the pair-instability supernova theory. This observation disfavors
the standard stellar-origin formation scenario for the heavier black hole,
motivating alternative hypotheses. We show that GW190521 cannot be explained
within the Primordial Black Hole (PBH) scenario if PBHs do not accrete during
their cosmological evolution, since this would require an abundance which is
already in tension with current constraints. On the other hand, GW190521 may
have a primordial origin if PBHs accrete efficiently before the reionization
epoch.
|
[{'version': 'v1', 'created': 'Thu, 3 Sep 2020 15:06:39 GMT'}
{'version': 'v2', 'created': 'Wed, 27 Jan 2021 08:35:06 GMT'}]
|
2021-02-10
|
[array(['De Luca', 'V.', ''], dtype=object)
array(['Desjacques', 'V.', ''], dtype=object)
array(['Franciolini', 'G.', ''], dtype=object)
array(['Pani', 'P.', ''], dtype=object)
array(['Riotto', 'A.', ''], dtype=object)]
|
6,794 |
astro-ph/0201096
|
Ulrich Heber
|
U. Heber (1), S. Moehler (1), R. Napiwotzki (1), P. Thejll (2) and
E.M. Green (3) ((1) University of Erlangen-Nuernberg, (2) Danish Meteorogical
Institute, (3) Steward Observatory)
|
Resolving subdwarf B stars in binaries by HST imaging
|
Astronomy & Astrophysics in press Latex processing fails to produce
the correct postscript file. Tried twice. That's why the postscript file is
submitted
| null |
10.1051/0004-6361:20020127
| null |
astro-ph
| null |
The origin of subluminous B stars is still an unsolved problem in stellar
evolution. Single star as well as close binary evolution scenarios have been
invoked but until now have met with little success. We have carried out a small
survey of spectroscopic binary candidates (19 systems consisting of an sdB star
and late type companion) with the Planetary Camera of the WFPC2 onboard Hubble
Space Telescope to test these scenarios. Monte Carlo simulations indicate that
by imaging the programme stars in the R-band about one third of the sample (6-7
stars) should be resolved at a limiting angular resolution of 0.1" if they have
linear separations like main sequence stars ("single star evolution"). None
should be resolvable if all systems were produced by close binary evolution. In
addition we expect three triple systems to be present in our sample. Most of
these, if not all, should be resolvable. Components were resolved in 6 systems
with separations between 0.2" and 4.5". However, only in two systems do the
magnitudes of the resolved components match the expectations from the
deconvolution of the spectral energy distribution. These two stars could be
physical binaries whereas in the other cases the nearby star may be a chance
projection or a third component. Radial velocity measurements indicate that the
resolved system TON 139 is a triple system, with the sdB having a close
companion that does not contribute detectably to the integrated light of the
system. Accordingly the success rate would be only 5% which is clearly below
the prediction for single star evolution. We conclude that the distribution of
separations of sdB binaries deviates strongly from that of normal stars. Our
results add further evidence that close binary evolution is fundamental for the
evolution of sdB stars. (abbreviated)
|
[{'version': 'v1', 'created': 'Mon, 7 Jan 2002 18:06:05 GMT'}]
|
2009-11-07
|
[array(['Heber', 'U.', ''], dtype=object)
array(['Moehler', 'S.', ''], dtype=object)
array(['Napiwotzki', 'R.', ''], dtype=object)
array(['Thejll', 'P.', ''], dtype=object)
array(['Green', 'E. M.', ''], dtype=object)]
|
6,795 |
1403.6721
|
Hubert Klahr
|
Hubert Klahr and Alexander Hubbard
|
Convective Overstability in radially stratified accretion disks under
thermal relaxation
|
Updated Version containing clarification of statements after initial
feedback
| null |
10.1088/0004-637X/788/1/21
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This letter expands the stability criterion for radially stratified,
vertically {unstratified} accretion disks incorporating thermal relaxation. We
find a linear amplification of epicyclic oscillations in these disks that
depends on the effective cooling time, i.e. an overstability. The growth rates
of the overstability vanish for both extreme cases, e.g. infinite cooling time
and instantaneous cooling, i.e. the adiabatic and fully isothermal cases.
However, for thermal relaxation times $\tau$ on the order of the orbital
frequency, $\tau\Omega \sim 1$, modes grow at a rate proportional to the square
of the Brunt-V\"ais\"al\"a frequency. The overstability is based on epicyclic
motions, with the thermal relaxation causing gas to heat while radially
displaced inwards, and cool while radially displaced outwards. This causes the
gas to have a lower density when moving outwards compared to when it moves
inwards, so it feels the outwards directed pressure force more strongly on that
leg of the journey. We suggest the term ``Convective Overstability" for the
phenomenon that has already been numerically studied in the non-linear regime
in the context of amplifying vortices in disks, under the name ``Subcritical
Baroclinic Instability". The point of the present paper is to make clear that
vortex formation in three-dimensional disks is neither subcritical, i.e. does
not need a finite perturbation, nor is it baroclinic in the sense of
geophysical fluid dynamics, which requires on vertical shear. We find that
Convective Overstability is a linear instability that will operate under a wide
range of physical conditions for circumstellar disks.
|
[{'version': 'v1', 'created': 'Wed, 26 Mar 2014 15:50:40 GMT'}
{'version': 'v2', 'created': 'Tue, 1 Apr 2014 09:13:08 GMT'}]
|
2015-06-19
|
[array(['Klahr', 'Hubert', ''], dtype=object)
array(['Hubbard', 'Alexander', ''], dtype=object)]
|
6,796 |
hep-ph/9710290
|
Xiangdong Ji
|
Xiangdong Ji
|
Lorentz Symmetry and the Internal Structure of the Nucleon
|
6 pages, no figure
|
Phys.Rev. D58 (1998) 056003
|
10.1103/PhysRevD.58.056003
|
U. Md PP# 98-042, DOE/ER/40762-133
|
hep-ph
| null |
To investigate the internal structure of the nucleon, it is useful to
introduce quantities that do not transform properly under Lorentz symmetry,
such as the four-momentum of the quarks in the nucleon, the amount of the
nucleon spin contributed by quark spin, etc. In this paper, we discuss to what
extent these quantities do provide Lorentz-invariant descriptions of the
nucleon structure.
|
[{'version': 'v1', 'created': 'Wed, 8 Oct 1997 19:40:01 GMT'}]
|
2009-10-30
|
[array(['Ji', 'Xiangdong', ''], dtype=object)]
|
6,797 |
1704.05191
|
Shane Chern
|
Shane Chern, Ae Ja Yee
|
Overpartitions with bounded part differences
| null |
European J. Combin. 70 (2018), 317--324
|
10.1016/j.ejc.2018.01.003
| null |
math.CO math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalize recent results of Breuer and Kronholm, and Chern on partitions
and overpartitions with bounded differences between largest and smallest parts.
We prove our generalization both analytically and combinatorially.
|
[{'version': 'v1', 'created': 'Tue, 18 Apr 2017 03:43:29 GMT'}
{'version': 'v2', 'created': 'Tue, 22 May 2018 18:01:07 GMT'}]
|
2018-05-24
|
[array(['Chern', 'Shane', ''], dtype=object)
array(['Yee', 'Ae Ja', ''], dtype=object)]
|
6,798 |
cond-mat/0009481
|
Chen Wei
|
Wei Chen, Kazuo Hida and B. C. Sanctuary
|
Magnetization plateaus and phase diagram in polymerized S=1/2 XXZ chains
|
5pages, 5figures
|
Phys. Rev. B63 134427 (2001).
|
10.1103/PhysRevB.63.134427
| null |
cond-mat.str-el cond-mat.stat-mech
| null |
The magnetization plateaus of $p$-merized $S=1/2$ XXZ chains are studied for
general values of $p$. Two plateau-non-plateau critical lines and one
plateau-plateau critical line are found for each value of $p$. The universality
class of the plateau-non-plateau transition belongs to
Brezinskii-Kosterlitz-Thouless (BKT) type and that of the plateau-plateau
transition, to the Gaussian type. The critical points are determined by level
spectroscopic analysis of the numerical diagonalization results for $4 \le p
\le 8$. The multicritical points are calculated using the integral equations
based on the Bethe ansatz solution of the XXZ model. The behavior of
multicritical points are analyzed in detail for large $p$. It is found that the
plateau region is enhanced with the increase of periodicity $p$ although the
non-plateau region persists as far as $p$ is finite.
|
[{'version': 'v1', 'created': 'Fri, 29 Sep 2000 22:48:12 GMT'}]
|
2009-10-31
|
[array(['Chen', 'Wei', ''], dtype=object)
array(['Hida', 'Kazuo', ''], dtype=object)
array(['Sanctuary', 'B. C.', ''], dtype=object)]
|
6,799 |
physics/0612146
|
Renaud Lambiotte
|
R. Lambiotte, M. Ausloos, and J. Holyst
|
Majority Model on a network with communities
|
4 pages
|
Phys. Rev. E 75, 030101(R) (2007)
|
10.1103/PhysRevE.75.030101
| null |
physics.soc-ph
| null |
We focus on the majority model in a topology consisting of two coupled
fully-connected networks, thereby mimicking the existence of communities in
social networks. We show that a transition takes place at a value of the
inter-connectivity parameter. Above this value, only symmetric solutions
prevail, where both communities agree with each other and reach consensus.
Below this value, in contrast, the communities can reach opposite opinions and
an asymmetric state is attained. The importance of the interface between the
sub-networks is shown.
|
[{'version': 'v1', 'created': 'Thu, 14 Dec 2006 20:46:47 GMT'}
{'version': 'v2', 'created': 'Wed, 24 Jan 2007 13:26:12 GMT'}
{'version': 'v3', 'created': 'Fri, 9 Feb 2007 14:29:46 GMT'}]
|
2007-06-13
|
[array(['Lambiotte', 'R.', ''], dtype=object)
array(['Ausloos', 'M.', ''], dtype=object)
array(['Holyst', 'J.', ''], dtype=object)]
|
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