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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1,900 |
gr-qc/0207051
|
Marcelo S. Berman
|
Marcelo Samuel Berman and Luis A. Trevisan
|
Inflationary Lambda-Universe with Time Varying Fundamental Constants
|
8 pages including front cover
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Barrow, and Barrow and collaborators, have put forward theoretical models
with variable fundamental constants including JBD theories. The experimental
evidence for an accelerating Universe points out to a deceleration parameter
approximately equal to -- 1. On the other hand, there is evidence for a time
varying fine structure constant alpha . We have included the above results in a
JBD cosmological model modified by J.D. Barrow by including a time varying
speed of light, thus, finding an exponential inflationary phase with variables
G, alpha and c . This means that the primordial value of alpha was
exponentially larger than its present value. Planck`s time may not be then
approximately 10 to the power - 43 s ; the same may happen to other Planck`s
quantities. We found an exponentially time-decaying Cosmological term.
|
[{'version': 'v1', 'created': 'Fri, 12 Jul 2002 14:54:57 GMT'}
{'version': 'v2', 'created': 'Mon, 15 Jul 2002 20:42:22 GMT'}
{'version': 'v3', 'created': 'Sat, 25 Jul 2009 23:58:08 GMT'}
{'version': 'v4', 'created': 'Mon, 27 Jul 2009 23:17:48 GMT'}
{'version': 'v5', 'created': 'Sat, 8 Aug 2009 13:53:47 GMT'}
{'version': 'v6', 'created': 'Wed, 23 Sep 2009 10:20:29 GMT'}]
|
2009-09-23
|
[array(['Berman', 'Marcelo Samuel', ''], dtype=object)
array(['Trevisan', 'Luis A.', ''], dtype=object)]
|
1,901 |
astro-ph/0103444
|
Thomas P. Krichbaum
|
T.P. Krichbaum, A. Witzel, and J.A. Zensus
|
From Centimeter to Millimeter Wavelengths: A High Angular Resolution
Study of 3C273
|
6 pages, 8 figures, appeared in: Proceedings of the 5th European VLBI
Network Symposium held at Onsala Space Observatory, June 29-July 1, 2000,
eds. J.E. Conway, A.G. Polatidis, R.S. Booth, and Y.M. Pihlstrom, p. 25-30.
(ISBN 91-631-0548-9)
| null | null | null |
astro-ph
| null |
We monitored 3C273 with VLBI at 15-86 GHz since 1990. We discuss component
trajectories, opacity effects at the jet base, a rotating and perhaps
precessing jet, and outburst-ejection relations from Gamma-ray to radio bands.
|
[{'version': 'v1', 'created': 'Tue, 27 Mar 2001 11:09:41 GMT'}]
|
2007-05-23
|
[array(['Krichbaum', 'T. P.', ''], dtype=object)
array(['Witzel', 'A.', ''], dtype=object)
array(['Zensus', 'J. A.', ''], dtype=object)]
|
1,902 |
2209.14297
|
Isaiah Kiprono Mutai
|
Isaiah K. Mutai, Kristof Van Laerhoven, Nancy W. Karuri, Robert K.
Tewo
|
Using Multivariate Linear Regression for Biochemical Oxygen Demand
Prediction in Waste Water
| null | null | null | null |
q-bio.OT cs.LG stat.AP
|
http://creativecommons.org/licenses/by/4.0/
|
There exist opportunities for Multivariate Linear Regression (MLR) in the
prediction of Biochemical Oxygen Demand (BOD) in waste water, using the diverse
water quality parameters as the input variables. The goal of this work is to
examine the capability of MLR in prediction of BOD in waste water through four
input variables: Dissolved Oxygen (DO), Nitrogen, Fecal Coliform and Total
Coliform. The four input variables have higher correlation strength to BOD out
of the seven parameters examined for the strength of correlation. Machine
Learning (ML) was done with both 80% and 90% of the data as the training set
and 20% and 10% as the test set respectively. MLR performance was evaluated
through the coefficient of correlation (r), Root Mean Square Error (RMSE) and
the percentage accuracy in prediction of BOD. The performance indices for the
input variables of Dissolved Oxygen, Nitrogen, Fecal Coliform and Total
Coliform in prediction of BOD are: RMSE=6.77mg/L, r=0.60 and accuracy 70.3% for
training dataset of 80% and RMSE=6.74mg/L, r=0.60 and accuracy of 87.5% for
training set of 90% of the dataset. It was found that increasing the percentage
of the training set above 80% of the dataset improved the accuracy of the model
only but did not have a significant impact on the prediction capacity of the
model. The results showed that MLR model could be successfully employed in the
estimation of BOD in waste water using appropriately selected input parameters.
|
[{'version': 'v1', 'created': 'Thu, 8 Sep 2022 14:41:02 GMT'}]
|
2022-09-30
|
[array(['Mutai', 'Isaiah K.', ''], dtype=object)
array(['Van Laerhoven', 'Kristof', ''], dtype=object)
array(['Karuri', 'Nancy W.', ''], dtype=object)
array(['Tewo', 'Robert K.', ''], dtype=object)]
|
1,903 |
2009.08138
|
Yutai Hou
|
Yutai Hou, Jiafeng Mao, Yongkui Lai, Cheng Chen, Wanxiang Che, Zhigang
Chen, Ting Liu
|
FewJoint: A Few-shot Learning Benchmark for Joint Language Understanding
|
Code and dataset is available at:
https://github.com/AtmaHou/MetaDialog
| null | null | null |
cs.CL cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Few-shot learning (FSL) is one of the key future steps in machine learning
and has raised a lot of attention. However, in contrast to the rapid
development in other domains, such as Computer Vision, the progress of FSL in
Nature Language Processing (NLP) is much slower. One of the key reasons for
this is the lacking of public benchmarks. NLP FSL researches always report new
results on their own constructed few-shot datasets, which is pretty inefficient
in results comparison and thus impedes cumulative progress. In this paper, we
present FewJoint, a novel Few-Shot Learning benchmark for NLP. Different from
most NLP FSL research that only focus on simple N-classification problems, our
benchmark introduces few-shot joint dialogue language understanding, which
additionally covers the structure prediction and multi-task reliance problems.
This allows our benchmark to reflect the real-word NLP complexity beyond simple
N-classification. Our benchmark is used in the few-shot learning contest of
SMP2020-ECDT task-1. We also provide a compatible FSL platform to ease
experiment set-up.
|
[{'version': 'v1', 'created': 'Thu, 17 Sep 2020 08:17:12 GMT'}
{'version': 'v2', 'created': 'Wed, 18 Nov 2020 15:19:05 GMT'}
{'version': 'v3', 'created': 'Sun, 13 Dec 2020 06:24:12 GMT'}]
|
2020-12-15
|
[array(['Hou', 'Yutai', ''], dtype=object)
array(['Mao', 'Jiafeng', ''], dtype=object)
array(['Lai', 'Yongkui', ''], dtype=object)
array(['Chen', 'Cheng', ''], dtype=object)
array(['Che', 'Wanxiang', ''], dtype=object)
array(['Chen', 'Zhigang', ''], dtype=object)
array(['Liu', 'Ting', ''], dtype=object)]
|
1,904 |
2204.04726
|
Tao Qi
|
Tao Qi, Fangzhao Wu, Chuhan Wu, Yongfeng Huang
|
News Recommendation with Candidate-aware User Modeling
|
SIGIR 2022
| null | null | null |
cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
News recommendation aims to match news with personalized user interest.
Existing methods for news recommendation usually model user interest from
historical clicked news without the consideration of candidate news. However,
each user usually has multiple interests, and it is difficult for these methods
to accurately match a candidate news with a specific user interest. In this
paper, we present a candidate-aware user modeling method for personalized news
recommendation, which can incorporate candidate news into user modeling for
better matching between candidate news and user interest. We propose a
candidate-aware self-attention network that uses candidate news as clue to
model candidate-aware global user interest. In addition, we propose a
candidate-aware CNN network to incorporate candidate news into local behavior
context modeling and learn candidate-aware short-term user interest. Besides,
we use a candidate-aware attention network to aggregate previously clicked news
weighted by their relevance with candidate news to build candidate-aware user
representation. Experiments on real-world datasets show the effectiveness of
our method in improving news recommendation performance.
|
[{'version': 'v1', 'created': 'Sun, 10 Apr 2022 17:02:29 GMT'}]
|
2022-04-12
|
[array(['Qi', 'Tao', ''], dtype=object)
array(['Wu', 'Fangzhao', ''], dtype=object)
array(['Wu', 'Chuhan', ''], dtype=object)
array(['Huang', 'Yongfeng', ''], dtype=object)]
|
1,905 |
1712.01633
|
Rafael Ballester-Ripoll
|
Rafael Ballester-Ripoll, Enrique G. Paredes, Renato Pajarola
|
Tensor Approximation of Advanced Metrics for Sensitivity Analysis
| null | null | null | null |
cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Following up on the success of the analysis of variance (ANOVA) decomposition
and the Sobol indices (SI) for global sensitivity analysis, various related
quantities of interest have been defined in the literature including the
effective and mean dimensions, the dimension distribution, and the Shapley
values. Such metrics combine up to exponential numbers of SI in different ways
and can be of great aid in uncertainty quantification and model interpretation
tasks, but are computationally challenging. We focus on surrogate based
sensitivity analysis for independently distributed variables, namely via the
tensor train (TT) decomposition. This format permits flexible and scalable
surrogate modeling and can efficiently extract all SI at once in a compressed
TT representation of their own. Based on this, we contribute a range of novel
algorithms that compute more advanced sensitivity metrics by selecting and
aggregating certain subsets of SI in the tensor compressed domain. Drawing on
an interpretation of the TT model in terms of deterministic finite automata, we
are able to construct explicit auxiliary TT tensors that encode exactly all
necessary index selection masks. Having both the SI and the masks in the TT
format allows efficient computation of all aforementioned metrics, as we
demonstrate in a number of example models.
|
[{'version': 'v1', 'created': 'Tue, 5 Dec 2017 14:13:12 GMT'}]
|
2017-12-06
|
[array(['Ballester-Ripoll', 'Rafael', ''], dtype=object)
array(['Paredes', 'Enrique G.', ''], dtype=object)
array(['Pajarola', 'Renato', ''], dtype=object)]
|
1,906 |
2102.02052
|
Meriem Djouala
|
Meriem Djouala and Noureddine Mebarki
|
Neutral Higgs bosons phenomenology in the compact 341 model and
confrontations with the LHC results
|
23 pages, 11 figures and 12 tables
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The phenomenology of the neutral scalar bosons in the compact 341 model is
discussed. We show that the predictions of this model are fairly good and
compatible with the experimental data by calculating the signal strength of
$h_1$ for the channels $b\bar{b}$, W$W^{*}$, Z$Z^{*}$, $\tau\bar{\tau}$ and
$\gamma\gamma$. Moreover, we use the branching ratios to search for the heavy
neutral scalar bosons $h_2$ and $h_3$ where we take into account the
theoretical constraints to precise the allowed ranges for the fundamental
parameters of the scalar potential.
|
[{'version': 'v1', 'created': 'Tue, 2 Feb 2021 15:07:17 GMT'}]
|
2021-02-04
|
[array(['Djouala', 'Meriem', ''], dtype=object)
array(['Mebarki', 'Noureddine', ''], dtype=object)]
|
1,907 |
2205.04511
|
Takuma Narizuka
|
Takuma Narizuka, Kenta Takizawa, and Yoshihiro Yamazaki
|
Validation of a motion model for soccer players' sprint by means of
tracking data
|
10 pages, 7 figures
| null | null | null |
physics.soc-ph physics.class-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In soccer game analysis, the widespread availability of play-by-play and
tracking data has made it possible to test mathematical models that have been
discussed mainly theoretically. One of the essential models in soccer game
analysis is a motion model that predicts the arrival point of a player in $ t $
s. Although many space evaluation and pass prediction methods rely on motion
models, the validity of each has not been fully clarified. This study focuses
on the motion model proposed by Fujimura and Sugihara (Fujimura-Sugihara model)
under sprint conditions based on the equation of motion. A previous study
indicated that the Fujimura-Sugihara model is ineffective for soccer games
because it generates a circular arrival region. This study aims to examine the
validity of the Fujimura-Sugihara model using soccer tracking data.
Specifically, we quantitatively compare the arrival regions of players between
the model and real data. We show that the boundary of the player's arrival
region is circular rather than elliptical, which is consistent with the model.
We also show that the initial speed dependence of the arrival region satisfies
the solution of the model. Furthermore, we propose a method for estimating
valid kinetic parameters in the model directly from tracking data and discuss
the limitations of the model for soccer games based on the estimated
parameters.
|
[{'version': 'v1', 'created': 'Tue, 10 May 2022 01:20:14 GMT'}
{'version': 'v2', 'created': 'Thu, 1 Dec 2022 04:06:15 GMT'}
{'version': 'v3', 'created': 'Sat, 14 Jan 2023 23:43:47 GMT'}]
|
2023-01-18
|
[array(['Narizuka', 'Takuma', ''], dtype=object)
array(['Takizawa', 'Kenta', ''], dtype=object)
array(['Yamazaki', 'Yoshihiro', ''], dtype=object)]
|
1,908 |
2103.07521
|
Adam Ball
|
Adam Ball
|
Global First Laws of Accelerating Black Holes
|
Made clarifications and expanded conclusion
| null |
10.1088/1361-6382/ac2139
| null |
hep-th gr-qc
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We generalize the first law of black hole mechanics to the rotating, charged
C-metric and to the Ernst metric, both of which have the charged C-metric as a
special case. All of these metrics are (3+1)-dimensional, have vanishing
cosmological constant, and physically describe a pair of black holes pulled
apart to null infinity by some external force. Our first laws are global in the
sense of applying to an entire patch of spacetime, as opposed to a neighborhood
of the black hole. They are formulated with respect to "boost time", whose
primacy is motivated by the celestial holographic approach to scattering
amplitudes.
|
[{'version': 'v1', 'created': 'Fri, 12 Mar 2021 20:50:37 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Jun 2021 20:51:01 GMT'}
{'version': 'v3', 'created': 'Wed, 11 Aug 2021 14:15:04 GMT'}]
|
2021-09-16
|
[array(['Ball', 'Adam', ''], dtype=object)]
|
1,909 |
1901.11417
|
Michalis Michaelides
|
Michalis Michaelides, Jane Hillston, Guido Sanguinetti
|
Geometric fluid approximation for general continuous-time Markov chains
| null |
Proc. R. Soc. A 475:2229 (2019)
|
10.1098/rspa.2019.0100
| null |
eess.SY cs.SY stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fluid approximations have seen great success in approximating the macro-scale
behaviour of Markov systems with a large number of discrete states. However,
these methods rely on the continuous-time Markov chain (CTMC) having a
particular population structure which suggests a natural continuous state-space
endowed with a dynamics for the approximating process. We construct here a
general method based on spectral analysis of the transition matrix of the CTMC,
without the need for a population structure. Specifically, we use the popular
manifold learning method of diffusion maps to analyse the transition matrix as
the operator of a hidden continuous process. An embedding of states in a
continuous space is recovered, and the space is endowed with a drift vector
field inferred via Gaussian process regression. In this manner, we construct an
ODE whose solution approximates the evolution of the CTMC mean, mapped onto the
continuous space (known as the fluid limit).
|
[{'version': 'v1', 'created': 'Thu, 31 Jan 2019 15:12:59 GMT'}
{'version': 'v2', 'created': 'Sun, 27 Oct 2019 17:49:32 GMT'}]
|
2019-10-29
|
[array(['Michaelides', 'Michalis', ''], dtype=object)
array(['Hillston', 'Jane', ''], dtype=object)
array(['Sanguinetti', 'Guido', ''], dtype=object)]
|
1,910 |
2112.01174
|
Yating Ren
|
Yating Ren and Junzhong Ji and Lingfeng Niu and Minglong Lei
|
Multi-task Self-distillation for Graph-based Semi-Supervised Learning
| null | null | null | null |
cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Graph convolutional networks have made great progress in graph-based
semi-supervised learning. Existing methods mainly assume that nodes connected
by graph edges are prone to have similar attributes and labels, so that the
features smoothed by local graph structures can reveal the class similarities.
However, there often exist mismatches between graph structures and labels in
many real-world scenarios, where the structures may propagate misleading
features or labels that eventually affect the model performance. In this paper,
we propose a multi-task self-distillation framework that injects
self-supervised learning and self-distillation into graph convolutional
networks to separately address the mismatch problem from the structure side and
the label side. First, we formulate a self-supervision pipeline based on
pre-text tasks to capture different levels of similarities in graphs. The
feature extraction process is encouraged to capture more complex proximity by
jointly optimizing the pre-text task and the target task. Consequently, the
local feature aggregations are improved from the structure side. Second,
self-distillation uses soft labels of the model itself as additional
supervision, which has similar effects as label smoothing. The knowledge from
the classification pipeline and the self-supervision pipeline is collectively
distilled to improve the generalization ability of the model from the label
side. Experiment results show that the proposed method obtains remarkable
performance gains under several classic graph convolutional architectures.
|
[{'version': 'v1', 'created': 'Thu, 2 Dec 2021 12:43:41 GMT'}
{'version': 'v2', 'created': 'Thu, 9 Jun 2022 16:37:23 GMT'}
{'version': 'v3', 'created': 'Fri, 10 Jun 2022 01:06:11 GMT'}]
|
2022-06-13
|
[array(['Ren', 'Yating', ''], dtype=object)
array(['Ji', 'Junzhong', ''], dtype=object)
array(['Niu', 'Lingfeng', ''], dtype=object)
array(['Lei', 'Minglong', ''], dtype=object)]
|
1,911 |
1905.13263
|
Giuseppe Maria Coclite
|
Giuseppe Maria Coclite, Serena Dipierro, Francesco Maddalena, and
Enrico Valdinoci
|
Singularity formation in fractional Burgers' equations
|
18 pages, 1 figure
| null |
10.1007/s00332-020-09608-x
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The formation of singularities in finite time in non-local Burgers'
equations, with time-fractional derivative, is studied in detail. The
occurrence of finite time singularity is proved, revealing the underlying
mechanism, and precise estimates on the blow-up time are provided. The
employment of the present equation to model a problem arising in job market is
also analyzed.
|
[{'version': 'v1', 'created': 'Thu, 30 May 2019 18:59:03 GMT'}]
|
2020-02-19
|
[array(['Coclite', 'Giuseppe Maria', ''], dtype=object)
array(['Dipierro', 'Serena', ''], dtype=object)
array(['Maddalena', 'Francesco', ''], dtype=object)
array(['Valdinoci', 'Enrico', ''], dtype=object)]
|
1,912 |
0709.3561
|
Atish Kamble
|
Atish Kamble, L. Resmi, Kuntal Misra
|
Observations of the Optical Afterglow of GRB 050319 : Wind to ISM
transition in view
|
11 pages, 3 tables, 1 figures
|
Astrophys.J.664:L5-L8,2007
|
10.1086/520533
| null |
astro-ph
| null |
The collapse of a massive star is believed to be the most probable progenitor
of a long GRB. Such a star is expected to modify its environment by stellar
wind. The effect of such a circum-stellar wind medium is expected to be seen in
the evolution of a GRB afterglow, but has so far not been conclusively found.
We claim that a signature of wind to constant density medium transition of
circum-burst medium is visible in the afterglow of GRB 050319. Along with the
optical observations of the afterglow of GRB 050319 we present a model for the
multiband afterglow of GRB 050319. We show that the break seen in optical light
curve at $\sim$ 0.02 day could be explained as being due to wind to constant
density medium transition of circum-burst medium, in which case, to our
knowledge, this could be the first ever detection of such a transition at any
given frequency band. Detection of such a transition could also serve as a
confirmation of massive star collapse scenario for GRB progenitors, independent
of supernova signatures.
|
[{'version': 'v1', 'created': 'Sat, 22 Sep 2007 04:30:02 GMT'}]
|
2009-11-13
|
[array(['Kamble', 'Atish', ''], dtype=object)
array(['Resmi', 'L.', ''], dtype=object)
array(['Misra', 'Kuntal', ''], dtype=object)]
|
1,913 |
1807.09950
|
Thai Hung Le
|
Hung Le, Truyen Tran, Thin Nguyen and Svetha Venkatesh
|
Variational Memory Encoder-Decoder
|
17 pages
| null | null | null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Introducing variability while maintaining coherence is a core task in
learning to generate utterances in conversation. Standard neural
encoder-decoder models and their extensions using conditional variational
autoencoder often result in either trivial or digressive responses. To overcome
this, we explore a novel approach that injects variability into neural
encoder-decoder via the use of external memory as a mixture model, namely
Variational Memory Encoder-Decoder (VMED). By associating each memory read with
a mode in the latent mixture distribution at each timestep, our model can
capture the variability observed in sequential data such as natural
conversations. We empirically compare the proposed model against other recent
approaches on various conversational datasets. The results show that VMED
consistently achieves significant improvement over others in both metric-based
and qualitative evaluations.
|
[{'version': 'v1', 'created': 'Thu, 26 Jul 2018 04:41:30 GMT'}
{'version': 'v2', 'created': 'Sat, 20 Oct 2018 06:18:04 GMT'}]
|
2018-10-23
|
[array(['Le', 'Hung', ''], dtype=object)
array(['Tran', 'Truyen', ''], dtype=object)
array(['Nguyen', 'Thin', ''], dtype=object)
array(['Venkatesh', 'Svetha', ''], dtype=object)]
|
1,914 |
1408.5915
|
Saarik Kalia
|
Saarik Kalia, Micha Sharir, Noam Solomon, and Ben Yang
|
Generalizations of the Szemer\'edi-Trotter Theorem
| null | null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalize the Szemer\'edi-Trotter incidence theorem, to bound the number
of complete \emph{flags} in higher dimensions. Specifically, for each
$i=0,1,\ldots,d-1$, we are given a finite set $S_i$ of $i$-flats in $\R^d$ or
in $\C^d$, and a (complete) flag is a tuple $(f_0,f_1,\ldots,f_{d-1})$, where
$f_i\in S_i$ for each $i$ and $f_i\subset f_{i+1}$ for each $i=0,1,\ldots,d-2$.
Our main result is an upper bound on the number of flags which is tight in the
worst case.
We also study several other kinds of incidence problems, including (i)
incidences between points and lines in $\R^3$ such that among the lines
incident to a point, at most $O(1)$ of them can be coplanar, (ii) incidences
with Legendrian lines in $\R^3$, a special class of lines that arise when
considering flags that are defined in terms of other groups, and (iii) flags in
$\R^3$ (involving points, lines, and planes), where no given line can contain
too many points or lie on too many planes. The bound that we obtain in (iii) is
nearly tight in the worst case.
Finally, we explore a group theoretic interpretation of flags, a generalized
version of which leads us to new incidence problems.
|
[{'version': 'v1', 'created': 'Mon, 25 Aug 2014 20:12:54 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Oct 2014 01:41:38 GMT'}
{'version': 'v3', 'created': 'Wed, 30 Dec 2015 18:44:24 GMT'}]
|
2015-12-31
|
[array(['Kalia', 'Saarik', ''], dtype=object)
array(['Sharir', 'Micha', ''], dtype=object)
array(['Solomon', 'Noam', ''], dtype=object)
array(['Yang', 'Ben', ''], dtype=object)]
|
1,915 |
1606.08225
|
Alexander Magazinov
|
Pavle V. M. Blagojevi\'c, Roman Karasev, Alexander Magazinov
|
A center transversal theorem for an improved Rado depth
|
v.2: Corrections in Sections 3 and 4 implemented, not affecting the
course of the proof; v.3: Replaced with a joint paper by 3 authors with a
stronger result; v.4: Final version, accepted to Discrete Comp. Geom
|
Discrete & Computational Geometry 60:2 (2018), 406-419
|
10.1007/s00454-018-0006-0
| null |
math.MG math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A celebrated result of Dol'nikov, and of \v{Z}ivaljevi\'c and Vre\'cica,
asserts that for every collection of $m$ measures $\mu_1,\dots,\mu_m$ on the
Euclidean space $\mathbb R^{n + m - 1}$ there exists a projection onto an
$n$-dimensional vector subspace $\Gamma$ with a point in it at depth at least
$\tfrac{1}{n + 1}$ with respect to each associated $n$-dimensional marginal
measure $\Gamma_*\mu_1,\dots,\Gamma_*\mu_m$.
In this paper we consider a natural extension of this result and ask for a
minimal dimension of a Euclidean space in which one can require that for any
collection of $m$ measures there exists a vector subspace $\Gamma$ with a point
in it at depth slightly greater than $\tfrac{1}{n + 1}$ with respect to each
$n$-dimensional marginal measure. In particular, we prove that if the required
depth is $\tfrac{1}{n + 1} + \tfrac{1}{3(n + 1)^3}$ then the increase in the
dimension of the ambient space is a linear function in both $m$ and $n$.
|
[{'version': 'v1', 'created': 'Mon, 27 Jun 2016 11:43:32 GMT'}
{'version': 'v2', 'created': 'Sun, 3 Jul 2016 14:34:29 GMT'}
{'version': 'v3', 'created': 'Tue, 6 Sep 2016 15:48:09 GMT'}
{'version': 'v4', 'created': 'Sat, 14 Apr 2018 20:17:58 GMT'}]
|
2018-08-07
|
[array(['Blagojević', 'Pavle V. M.', ''], dtype=object)
array(['Karasev', 'Roman', ''], dtype=object)
array(['Magazinov', 'Alexander', ''], dtype=object)]
|
1,916 |
1903.02488
|
Bertram Bitsch
|
Bertram Bitsch, Sean N. Raymond, Andre Izidoro
|
Rocky super-Earths or waterworlds: the interplay of planet migration,
pebble accretion and disc evolution
|
accepted by A&A, 12 pages
|
A&A 624, A109 (2019)
|
10.1051/0004-6361/201935007
| null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent observations have found a valley in the size distribution of close-in
super-Earths that is interpreted as a signpost that close-in super-Earths are
mostly rocky in composition. However, new models predict that planetesimals
should first form at the water ice line such that close-in planets are expected
to have a significant water ice component. Here we investigate the water
contents of super-Earths by studying the interplay between pebble accretion,
planet migration and disc evolution. Planets' compositions are determined by
their position relative to different condensation fronts (ice lines) throughout
their growth. Migration plays a key role. Assuming that planetesimals start at
or exterior to the water ice line ($r>r_{\rm H_2O}$), inward migration causes
planets to leave the source region of icy pebbles and therefore to have lower
final water contents than in discs with either outward migration or no
migration. The water ice line itself moves inward as the disc evolves, and
delivers water as it sweeps across planets that formed dry. The relative speed
and direction of planet migration and inward drift of the water ice line is
thus central in determining planets' water contents. If planet formation starts
at the water ice line, this implies that hot close-in super-Earths (r<0.3 AU)
with water contents of a few percent are a signpost of inward planet migration
during the early gas phase. Hot super-Earths with larger water ice contents on
the other hand, experienced outward migration at the water ice line and only
migrated inwards after their formation was complete either because they become
too massive to be contained in the region of outward migration or in chains of
resonant planets. Measuring the water ice content of hot super-Earths may thus
constrain their migration history.
|
[{'version': 'v1', 'created': 'Wed, 6 Mar 2019 16:53:43 GMT'}]
|
2019-04-24
|
[array(['Bitsch', 'Bertram', ''], dtype=object)
array(['Raymond', 'Sean N.', ''], dtype=object)
array(['Izidoro', 'Andre', ''], dtype=object)]
|
1,917 |
1109.5332
|
Karen Lewis
|
Karen M. Lewis
|
The Detectability of Moons of Extra-Solar Planets
|
361 pages, 286 figures, PhD thesis
| null | null | null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The detectability of moons of extra-solar planets is investigated, focussing
on the time-of-arrival perturbation technique, a method for detecting moons of
pulsar planets, and the photometric transit timing technique, a method for
detecting moons of transiting planets. Realistic thresholds are derived and
analysed in the in the context of the types of moons that are likely to form
and be orbitally stable for the lifetime of the system.
For the case of the time-of-arrival perturbation technique, the analysis is
conducted in two stages. First, a preliminary investigation is conducted
assuming that planet and moon's orbit are circular and coplanar. This analysis
is then applied to the case of the pulsar planet PSR B1620-26 b, and used to
conclude that a stable moon orbiting this pulsar planet could be detected, if
its mass was >5% of its planet's mass (2.5 Jupiter masses), and if the
planet-moon distance was ~ 2% of the planet-pulsar separation (23 AU).
Time-of-arrival expressions are then derived for mutually inclined as well as
non-circular orbits.
For the case of the photometric transit timing technique, a different
approach is adopted. First, analytic expressions for the timing perturbation
due to the moon are derived for the case where the orbit of the moon is
circular and coplanar with that of the planet and where the planet's orbit is
circular and aligned to the line-of-sight, circular and inclined with respect
to the line-of-sight or eccentric and aligned to the line-of-sight. Second, the
timing noise is investigated analytically, for the case of white photometric
noise, and numerically, using SOHO lightcurves, for the case of realistic and
filtered realistic photometric noise. [...] Abstract truncated due to the
limitations of astroph. See full abstract in the thesis.
|
[{'version': 'v1', 'created': 'Sun, 25 Sep 2011 07:17:47 GMT'}]
|
2011-09-27
|
[array(['Lewis', 'Karen M.', ''], dtype=object)]
|
1,918 |
1809.02339
|
Andres G\'omez Rodriguez
|
A. Gomez
|
Fast and direct visualization of piezo-generated charges at the
nanoscale using direct piezoelectric force microscopy
| null | null | null | null |
physics.app-ph cond-mat.mes-hall cond-mat.mtrl-sci physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The denominated surface charge scraping mechanism was discovered in 2014 by
using a new Atomic Force Microscopy (AFM) based mode called Charge Gradient
Microscopy. The measurements to probe such mechanism are achieved with the use
of a current-to-voltage converter: a transimpedance amplifier (TIA). However,
the use of an incorrect approximation, named Gain BandWidth Product (GBWP) to
calculate TIAs BandWidth (BW) could mislead to an incorrect data
interpretation. By measuring at higher frequencies than permitted, the
amplifier is used as a current-to-voltage converter, in conditions where it
behaves as a charge-to-voltage converter. In this manuscript, we report the
specific conditions in which the transfer function of the same electronic
circuit topology is valid, while we spot both ringing and unstable amplifiers
artifacts in the published data. We finally perform physical measurements in
similar conditions as reported, but fully respecting the BandWidth (BW) of the
system. We find that the charge collected is way below the values reported in
such publication, diminishing or even nullifying the impact of a possible
charge scrapping mechanism. These findings pave the way to employ Direct
Piezoelectric Force Microscopy (DPFM) as a fast ferroelectric nanoscale
characterization tool.
|
[{'version': 'v1', 'created': 'Fri, 7 Sep 2018 08:04:21 GMT'}]
|
2018-09-10
|
[array(['Gomez', 'A.', ''], dtype=object)]
|
1,919 |
1108.3817
|
Robert Delbourgo
|
Robert Delbourgo
|
On 2D Periodic Hexagonal Cells
|
10 Figures
| null | null | null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Graphene, the new wondrous material, is a perfect example of a
two-dimensional hexagonal crystal unlike any other. Here we exhibit some of the
characteristic directional features associated with hexagonal cells,
emphasising the sixfold symmetry. We depict the X-ray, vibrational and
electronic band structures to be expected in such systems via 2 dimensional
contour plots.
|
[{'version': 'v1', 'created': 'Wed, 17 Aug 2011 01:23:21 GMT'}]
|
2011-08-19
|
[array(['Delbourgo', 'Robert', ''], dtype=object)]
|
1,920 |
1505.06621
|
Giuseppe Riccio
|
Giuseppe Riccio, Stefano Cavuoti, Eugenio Schisano, Massimo Brescia,
Amata Mercurio, Davide Elia, Milena Benedettini, Stefano Pezzuto, Sergio
Molinari and Anna Maria Di Giorgio
|
Machine learning based data mining for Milky Way filamentary structures
reconstruction
|
Proceeding of WIRN 2015 Conference, May 20-22, Vietri sul Mare,
Salerno, Italy. Published in Smart Innovation, Systems and Technology,
Springer, ISSN 2190-3018, 9 pages, 4 figures
| null |
10.1007/978-3-319-33747-0_3
| null |
astro-ph.IM cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an innovative method called FilExSeC (Filaments Extraction,
Selection and Classification), a data mining tool developed to investigate the
possibility to refine and optimize the shape reconstruction of filamentary
structures detected with a consolidated method based on the flux derivative
analysis, through the column-density maps computed from Herschel infrared
Galactic Plane Survey (Hi-GAL) observations of the Galactic plane. The present
methodology is based on a feature extraction module followed by a machine
learning model (Random Forest) dedicated to select features and to classify the
pixels of the input images. From tests on both simulations and real
observations the method appears reliable and robust with respect to the
variability of shape and distribution of filaments. In the cases of highly
defined filament structures, the presented method is able to bridge the gaps
among the detected fragments, thus improving their shape reconstruction. From a
preliminary "a posteriori" analysis of derived filament physical parameters,
the method appears potentially able to add a sufficient contribution to
complete and refine the filament reconstruction.
|
[{'version': 'v1', 'created': 'Mon, 25 May 2015 13:28:31 GMT'}
{'version': 'v2', 'created': 'Tue, 11 Oct 2016 11:31:43 GMT'}]
|
2017-08-23
|
[array(['Riccio', 'Giuseppe', ''], dtype=object)
array(['Cavuoti', 'Stefano', ''], dtype=object)
array(['Schisano', 'Eugenio', ''], dtype=object)
array(['Brescia', 'Massimo', ''], dtype=object)
array(['Mercurio', 'Amata', ''], dtype=object)
array(['Elia', 'Davide', ''], dtype=object)
array(['Benedettini', 'Milena', ''], dtype=object)
array(['Pezzuto', 'Stefano', ''], dtype=object)
array(['Molinari', 'Sergio', ''], dtype=object)
array(['Di Giorgio', 'Anna Maria', ''], dtype=object)]
|
1,921 |
quant-ph/0003040
|
Michal Horodecki
|
Michal Horodecki, Pawel Horodecki, and Ryszard Horodecki
|
Unified approach to quantum capacities: towards quantum noisy coding
theorem
|
4 pages, Revtex
| null |
10.1103/PhysRevLett.85.433
| null |
quant-ph
| null |
Basing on unified approach to {\it all} kinds of quantum capacities we show
that the rate of quantum information transmission is bounded by the maximal
attainable rate of coherent information. Moreover, we show that, if for any
bipartite state the one-way distillable entanglement is no less than coherent
information, then one obtains Shannon-like formulas for all the capacities. The
inequality also implies that the decrease of distillable entanglement due to
mixing process does not exceed of corresponding loss information about a
system.
|
[{'version': 'v1', 'created': 'Mon, 13 Mar 2000 09:18:22 GMT'}]
|
2009-11-06
|
[array(['Horodecki', 'Michal', ''], dtype=object)
array(['Horodecki', 'Pawel', ''], dtype=object)
array(['Horodecki', 'Ryszard', ''], dtype=object)]
|
1,922 |
1009.5797
|
Nizar Demni
|
Nizar Demni
|
Radon Transform on spheres and generalized Bessel function associated
with dihedral groups
|
Another proof of the main result is given, some typos are corrected
and concluding remarks are added
| null | null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by Dunkl operators theory, we consider a generating series
involving a modified Bessel function and a Gegenbauer polynomial, that
generalizes a known series already considered by L. Gegenbauer. We actually use
inversion formulas for Fourier and Radon transforms to derive a closed formula
for this series when the parameter of the Gegenbauer polynomial is a strictly
positive integer. As a by-product, we get a relatively simple integral
representation for the generalized Bessel function associated with even
dihedral groups when both multiplicities sum to an integer. In particular, we
recover a previous result obtained for the square symmetries-preserving group
and we give a special interest to the hexagon. The paper is closed with
adapting our method to odd dihedral groups thereby exhausting the list of Weyl
dihedral groups.
|
[{'version': 'v1', 'created': 'Wed, 29 Sep 2010 07:47:56 GMT'}
{'version': 'v2', 'created': 'Thu, 26 Jul 2012 21:57:43 GMT'}]
|
2012-07-30
|
[array(['Demni', 'Nizar', ''], dtype=object)]
|
1,923 |
2305.00894
|
Litao Yang
|
B. T. Zhang, L. T. Yang, Q. Yue, K. J. Kang, Y. J. Li, H. P. An,
Greeshma C., J. P. Chang, Y. H. Chen, J. P. Cheng, W. H. Dai, Z. Deng, C. H.
Fang, X. P. Geng, H. Gong, Q. J. Guo, X. Y. Guo, L. He, S. M. He, J. W. Hu,
H. X. Huang, T. C. Huang, H. T. Jia, X. Jiang, S. Karmakar, H. B. Li, J. M.
Li, J. Li, Q. Y. Li, R. M. J. Li, X. Q. Li, Y. L. Li, Y. F. Liang, B. Liao,
F. K. Lin, S. T. Lin, J. X. Liu, S. K. Liu, Y. D. Liu, Y. Liu, Y. Y. Liu, Z.
Z. Liu, H. Ma, Y. C. Mao, Q. Y. Nie, J. H. Ning, H. Pan, N. C. Qi, J. Ren, X.
C. Ruan, Z. She, M. K. Singh, T. X. Sun, C. J. Tang, W. Y. Tang, Y. Tian, G.
F. Wang, L. Wang, Q. Wang, Y. F. Wang, Y. X. Wang, H. T. Wong, S. Y. Wu, Y.
C. Wu, H. Y. Xing, R. Xu, Y. Xu, T. Xue, Y. L. Yan, N. Yi, C. X. Yu, H. J.
Yu, J. F. Yue, M. Zeng, Z. Zeng, F. S. Zhang, L. Zhang, Z. H. Zhang, Z. Y.
Zhang, K. K. Zhao, M. G. Zhao, J. F. Zhou, Z. Y. Zhou, J. J. Zhu
|
Searching for $^{76}$Ge neutrinoless double beta decay with the CDEX-1B
experiment
|
10 pages, 12 figures
| null | null | null |
nucl-ex hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We operated a p-type point contact high purity germanium (PPCGe) detector
(CDEX-1B, 1.008 kg) in the China Jinping Underground Laboratory (CJPL) for
500.3 days to search for neutrinoless double beta ($0\nu\beta\beta$) decay of
$^{76}$Ge. A total of 504.3 kg $\cdot$ day effective exposure data was
accumulated. The anti-coincidence and the multi/single-site event (MSE/SSE)
discrimination methods were used to suppress the background in the energy
region of interest (ROI, $1989-2089$ keV for this work) with a factor of 23. A
background level of 0.33 counts/(keV $\cdot$ kg $\cdot$ yr) was achieved. The
lower limit on the half life of $^{76}$Ge $0\nu\beta\beta$ decay was
constrained as $T_{1/2}^{0\nu}\ > \ {2.2}\times 10^{23}\ \rm yr\ (90\% \
C.L.)$, corresponding to the upper limits on the effective Majorana neutrino
mass: $\langle m_{\beta\beta}\rangle < 2.3-5.2\ \mathrm{eV}$.
|
[{'version': 'v1', 'created': 'Mon, 1 May 2023 15:55:36 GMT'}
{'version': 'v2', 'created': 'Mon, 8 May 2023 16:02:45 GMT'}]
|
2023-05-09
|
[array(['Zhang', 'B. T.', ''], dtype=object)
array(['Yang', 'L. T.', ''], dtype=object)
array(['Yue', 'Q.', ''], dtype=object)
array(['Kang', 'K. J.', ''], dtype=object)
array(['Li', 'Y. J.', ''], dtype=object)
array(['An', 'H. P.', ''], dtype=object)
array(['C.', 'Greeshma', ''], dtype=object)
array(['Chang', 'J. P.', ''], dtype=object)
array(['Chen', 'Y. H.', ''], dtype=object)
array(['Cheng', 'J. P.', ''], dtype=object)
array(['Dai', 'W. H.', ''], dtype=object)
array(['Deng', 'Z.', ''], dtype=object)
array(['Fang', 'C. H.', ''], dtype=object)
array(['Geng', 'X. P.', ''], dtype=object)
array(['Gong', 'H.', ''], dtype=object)
array(['Guo', 'Q. J.', ''], dtype=object)
array(['Guo', 'X. Y.', ''], dtype=object)
array(['He', 'L.', ''], dtype=object)
array(['He', 'S. M.', ''], dtype=object)
array(['Hu', 'J. W.', ''], dtype=object)
array(['Huang', 'H. X.', ''], dtype=object)
array(['Huang', 'T. C.', ''], dtype=object)
array(['Jia', 'H. T.', ''], dtype=object)
array(['Jiang', 'X.', ''], dtype=object)
array(['Karmakar', 'S.', ''], dtype=object)
array(['Li', 'H. B.', ''], dtype=object)
array(['Li', 'J. M.', ''], dtype=object)
array(['Li', 'J.', ''], dtype=object)
array(['Li', 'Q. Y.', ''], dtype=object)
array(['Li', 'R. M. J.', ''], dtype=object)
array(['Li', 'X. Q.', ''], dtype=object)
array(['Li', 'Y. L.', ''], dtype=object)
array(['Liang', 'Y. F.', ''], dtype=object)
array(['Liao', 'B.', ''], dtype=object)
array(['Lin', 'F. K.', ''], dtype=object)
array(['Lin', 'S. T.', ''], dtype=object)
array(['Liu', 'J. X.', ''], dtype=object)
array(['Liu', 'S. K.', ''], dtype=object)
array(['Liu', 'Y. D.', ''], dtype=object)
array(['Liu', 'Y.', ''], dtype=object)
array(['Liu', 'Y. Y.', ''], dtype=object)
array(['Liu', 'Z. Z.', ''], dtype=object)
array(['Ma', 'H.', ''], dtype=object)
array(['Mao', 'Y. C.', ''], dtype=object)
array(['Nie', 'Q. Y.', ''], dtype=object)
array(['Ning', 'J. H.', ''], dtype=object)
array(['Pan', 'H.', ''], dtype=object)
array(['Qi', 'N. C.', ''], dtype=object)
array(['Ren', 'J.', ''], dtype=object)
array(['Ruan', 'X. C.', ''], dtype=object)
array(['She', 'Z.', ''], dtype=object)
array(['Singh', 'M. K.', ''], dtype=object)
array(['Sun', 'T. X.', ''], dtype=object)
array(['Tang', 'C. J.', ''], dtype=object)
array(['Tang', 'W. Y.', ''], dtype=object)
array(['Tian', 'Y.', ''], dtype=object)
array(['Wang', 'G. F.', ''], dtype=object)
array(['Wang', 'L.', ''], dtype=object)
array(['Wang', 'Q.', ''], dtype=object)
array(['Wang', 'Y. F.', ''], dtype=object)
array(['Wang', 'Y. X.', ''], dtype=object)
array(['Wong', 'H. T.', ''], dtype=object)
array(['Wu', 'S. Y.', ''], dtype=object)
array(['Wu', 'Y. C.', ''], dtype=object)
array(['Xing', 'H. Y.', ''], dtype=object)
array(['Xu', 'R.', ''], dtype=object)
array(['Xu', 'Y.', ''], dtype=object)
array(['Xue', 'T.', ''], dtype=object)
array(['Yan', 'Y. L.', ''], dtype=object)
array(['Yi', 'N.', ''], dtype=object)
array(['Yu', 'C. X.', ''], dtype=object)
array(['Yu', 'H. J.', ''], dtype=object)
array(['Yue', 'J. F.', ''], dtype=object)
array(['Zeng', 'M.', ''], dtype=object)
array(['Zeng', 'Z.', ''], dtype=object)
array(['Zhang', 'F. S.', ''], dtype=object)
array(['Zhang', 'L.', ''], dtype=object)
array(['Zhang', 'Z. H.', ''], dtype=object)
array(['Zhang', 'Z. Y.', ''], dtype=object)
array(['Zhao', 'K. K.', ''], dtype=object)
array(['Zhao', 'M. G.', ''], dtype=object)
array(['Zhou', 'J. F.', ''], dtype=object)
array(['Zhou', 'Z. Y.', ''], dtype=object)
array(['Zhu', 'J. J.', ''], dtype=object)]
|
1,924 |
1812.03544
|
Yubo Zhang
|
Yubo Zhang, Pavel Tokmakov, Martial Hebert, Cordelia Schmid
|
A Structured Model For Action Detection
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A dominant paradigm for learning-based approaches in computer vision is
training generic models, such as ResNet for image recognition, or I3D for video
understanding, on large datasets and allowing them to discover the optimal
representation for the problem at hand. While this is an obviously attractive
approach, it is not applicable in all scenarios. We claim that action detection
is one such challenging problem - the models that need to be trained are large,
and labeled data is expensive to obtain. To address this limitation, we propose
to incorporate domain knowledge into the structure of the model, simplifying
optimization. In particular, we augment a standard I3D network with a tracking
module to aggregate long term motion patterns, and use a graph convolutional
network to reason about interactions between actors and objects. Evaluated on
the challenging AVA dataset, the proposed approach improves over the I3D
baseline by 5.5% mAP and over the state-of-the-art by 4.8% mAP.
|
[{'version': 'v1', 'created': 'Sun, 9 Dec 2018 18:57:33 GMT'}
{'version': 'v2', 'created': 'Thu, 24 Jan 2019 19:03:39 GMT'}
{'version': 'v3', 'created': 'Thu, 28 Feb 2019 17:58:30 GMT'}
{'version': 'v4', 'created': 'Fri, 12 Apr 2019 15:04:33 GMT'}
{'version': 'v5', 'created': 'Wed, 5 Jun 2019 17:55:42 GMT'}]
|
2019-06-06
|
[array(['Zhang', 'Yubo', ''], dtype=object)
array(['Tokmakov', 'Pavel', ''], dtype=object)
array(['Hebert', 'Martial', ''], dtype=object)
array(['Schmid', 'Cordelia', ''], dtype=object)]
|
1,925 |
0804.0074
|
Jaap-Henk Hoepman
|
Jaap-Henk Hoepman
|
Private Handshakes
| null |
n F. Stajano, editor, 4th Eur. Symp. on Security and Privacy in Ad
hoc and Sensor Networks, LNCS 4572, pages 31-42, Cambridge, UK, June 2-3 2007
| null | null |
cs.CR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Private handshaking allows pairs of users to determine which (secret) groups
they are both a member of. Group membership is kept secret to everybody else.
Private handshaking is a more private form of secret handshaking, because it
does not allow the group administrator to trace users. We extend the original
definition of a handshaking protocol to allow and test for membership of
multiple groups simultaneously. We present simple and efficient protocols for
both the single group and multiple group membership case.
Private handshaking is a useful tool for mutual authentication, demanded by
many pervasive applications (including RFID) for privacy. Our implementations
are efficient enough to support such usually resource constrained scenarios.
|
[{'version': 'v1', 'created': 'Tue, 1 Apr 2008 06:01:53 GMT'}]
|
2008-04-02
|
[array(['Hoepman', 'Jaap-Henk', ''], dtype=object)]
|
1,926 |
nlin/0303035
|
Andreas Heine
|
F. Beck, C. Dembowski, A. Heine, A. Richter (Institut fuer Kernphysik,
Technische Universitaet Darmstadt, Germany)
|
R-matrix theory of driven electromagnetic cavities
|
Revtex 4.0
|
Phys. Rev. E 67, 066208 (2003)
|
10.1103/PhysRevE.67.066208
|
IKDA 02/19
|
nlin.CD
| null |
Resonances of cylindrical symmetric microwave cavities are analyzed in
R-matrix theory which transforms the input channel conditions to the output
channels. Single and interfering double resonances are studied and compared
with experimental results, obtained with superconducting microwave cavities.
Because of the equivalence of the two-dimensional Helmholtz and the stationary
Schroedinger equations, the results present insight into the resonance
structure of regular and chaotic quantum billiards.
|
[{'version': 'v1', 'created': 'Tue, 18 Mar 2003 10:43:51 GMT'}
{'version': 'v2', 'created': 'Thu, 17 Jul 2003 11:45:01 GMT'}]
|
2009-11-10
|
[array(['Beck', 'F.', '',
'Institut fuer Kernphysik,\n Technische Universitaet Darmstadt, Germany'],
dtype=object)
array(['Dembowski', 'C.', '',
'Institut fuer Kernphysik,\n Technische Universitaet Darmstadt, Germany'],
dtype=object)
array(['Heine', 'A.', '',
'Institut fuer Kernphysik,\n Technische Universitaet Darmstadt, Germany'],
dtype=object)
array(['Richter', 'A.', '',
'Institut fuer Kernphysik,\n Technische Universitaet Darmstadt, Germany'],
dtype=object) ]
|
1,927 |
1308.4841
|
Paulo Rodrigues
|
Paulo Rodrigues, Nuno F. Loureiro, Justin Ball, and Felix I. Parra
|
Conditions for up-down asymmetry in the core of tokamak equilibria
|
6 pages, 2 figures, submitted for publication
|
Nucl. Fusion 54, 093003 (2014)
|
10.1088/0029-5515/54/9/093003
| null |
physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A local magnetic equilibrium solution is sought around the magnetic axis in
order to identify the key parameters defining the magnetic-surface's up-down
asymmetry in the core of tokamak plasmas. The asymmetry is found to be
determined essentially by the ratio of the toroidal current density flowing on
axis to the fraction of the external field's odd perturbation that manages to
propagate from the plasma boundary into the core. The predictions are tested
and illustrated first with an analytical Solovev equilibrium and then using
experimentally relevant numerical equilibria. Hollow current-density
distributions, and hence reverse magnetic shear, are seen to be crucial to
bring into the core asymmetry values that are usually found only near the
plasma edge.
|
[{'version': 'v1', 'created': 'Thu, 22 Aug 2013 12:25:51 GMT'}]
|
2014-10-08
|
[array(['Rodrigues', 'Paulo', ''], dtype=object)
array(['Loureiro', 'Nuno F.', ''], dtype=object)
array(['Ball', 'Justin', ''], dtype=object)
array(['Parra', 'Felix I.', ''], dtype=object)]
|
1,928 |
cond-mat/0005438
|
Michael R. Geller
|
Michael R. Geller, David J. Thouless, Sung-Wu Rhee, and W. F. Vinen
|
Iordanskii and Lifshitz-Pitaevskii Forces in the Two-Fluid Model
|
6 pages, conference proceeding for Quantum Fluids and Solids 2000
| null | null | null |
cond-mat.mes-hall cond-mat.supr-con
| null |
It has been known since the pioneering work of Onsager and Feynman that the
statistical mechanics and dynamics of vortices play an essential role in the
behavior of superfluids and superconductors. However, the theory of vortices in
quantum fluids remains in a most unsatisfactory state, with many conflicting
results in the literature. In this paper we review the theory of Thouless, Ao
and Niu, which gives an expression for the total transverse force acting on a
quantized vortex that is in apparent disagreement with the work of Iordanskii
and of Lifshitz and Pitaevskii. In particular, no transverse force proportional
to the asymptotic normal fluid velocity was found. We use two-fluid
hydrodynamics to study this discrepancy.
|
[{'version': 'v1', 'created': 'Thu, 25 May 2000 12:53:59 GMT'}]
|
2007-05-23
|
[array(['Geller', 'Michael R.', ''], dtype=object)
array(['Thouless', 'David J.', ''], dtype=object)
array(['Rhee', 'Sung-Wu', ''], dtype=object)
array(['Vinen', 'W. F.', ''], dtype=object)]
|
1,929 |
1105.1850
|
Fumio Hiroshima
|
Fumio Hiroshima, Jozsef Lorinczi, Toshimitsu Takaesu
|
A Probabilistic Representation of the Ground State Expectation of
Fractional Powers of the Boson Number Operator
| null | null | null | null |
math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give a formula in terms of a joint Gibbs measure on Brownian paths and the
measure of a random-time Poisson process of the ground state expectations of
fractional (in fact, any real) powers of the boson number operator in the
Nelson model. We use this representation to obtain tight two-sided bounds. As
applications, we discuss the polaron and translation invariant Nelson models.
|
[{'version': 'v1', 'created': 'Tue, 10 May 2011 03:50:58 GMT'}]
|
2011-05-11
|
[array(['Hiroshima', 'Fumio', ''], dtype=object)
array(['Lorinczi', 'Jozsef', ''], dtype=object)
array(['Takaesu', 'Toshimitsu', ''], dtype=object)]
|
1,930 |
1408.2265
|
Ivan Avramidi
|
Ivan G. Avramidi and Benjamin J. Buckman
|
Heat Determinant on Manifolds
|
41 pages
|
J. Geom. Phys. 104 (2016) 64-88
|
10.1016/j.geomphys.2016.02.004
| null |
math-ph math.DG math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce and study new invariants associated with Laplace type elliptic
partial differential operators on manifolds. These invariants are constructed
by using the off-diagonal heat kernel; they are not pure spectral invariants,
that is, they depend not only on the eigenvalues but also on the corresponding
eigenfunctions in a non-trivial way. We compute the first three low-order
invariants explicitly.
|
[{'version': 'v1', 'created': 'Sun, 10 Aug 2014 19:12:36 GMT'}]
|
2017-03-08
|
[array(['Avramidi', 'Ivan G.', ''], dtype=object)
array(['Buckman', 'Benjamin J.', ''], dtype=object)]
|
1,931 |
1109.5175
|
Jacob VanderPlas
|
Jake Vanderplas, Andrew Connolly, Bhuvnesh Jain, Mike Jarvis
|
Interpolating Masked Weak Lensing Signal with Karhunen-Loeve Analysis
|
13 pages, 9 figures; submitted to ApJ
| null |
10.1088/0004-637X/744/2/180
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the utility of Karhunen Loeve (KL) analysis in solving practical
problems in the analysis of gravitational shear surveys. Shear catalogs from
large-field weak lensing surveys will be subject to many systematic
limitations, notably incomplete coverage and pixel-level masking due to
foreground sources. We develop a method to use two dimensional KL eigenmodes of
shear to interpolate noisy shear measurements across masked regions. We explore
the results of this method with simulated shear catalogs, using statistics of
high-convergence regions in the resulting map. We find that the KL procedure
not only minimizes the bias due to masked regions in the field, it also reduces
spurious peak counts from shape noise by a factor of ~ 3 in the cosmologically
sensitive regime. This indicates that KL reconstructions of masked shear are
not only useful for creating robust convergence maps from masked shear
catalogs, but also offer promise of improved parameter constraints within
studies of shear peak statistics.
|
[{'version': 'v1', 'created': 'Fri, 23 Sep 2011 20:00:01 GMT'}]
|
2015-05-30
|
[array(['Vanderplas', 'Jake', ''], dtype=object)
array(['Connolly', 'Andrew', ''], dtype=object)
array(['Jain', 'Bhuvnesh', ''], dtype=object)
array(['Jarvis', 'Mike', ''], dtype=object)]
|
1,932 |
1602.04436
|
Andreas Loukas
|
Elvin Isufi and Andreas Loukas and Andrea Simonetto and Geert Leus
|
Autoregressive Moving Average Graph Filtering
| null |
IEEE Transactions on Signal Processing, vol. 67 (2), pages 274 -
288, 2017
|
10.1109/TSP.2016.2614793
| null |
cs.LG cs.SY stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the cornerstones of the field of signal processing on graphs are graph
filters, direct analogues of classical filters, but intended for signals
defined on graphs. This work brings forth new insights on the distributed graph
filtering problem. We design a family of autoregressive moving average (ARMA)
recursions, which (i) are able to approximate any desired graph frequency
response, and (ii) give exact solutions for tasks such as graph signal
denoising and interpolation. The design philosophy, which allows us to design
the ARMA coefficients independently from the underlying graph, renders the ARMA
graph filters suitable in static and, particularly, time-varying settings. The
latter occur when the graph signal and/or graph are changing over time. We show
that in case of a time-varying graph signal our approach extends naturally to a
two-dimensional filter, operating concurrently in the graph and regular time
domains. We also derive sufficient conditions for filter stability when the
graph and signal are time-varying. The analytical and numerical results
presented in this paper illustrate that ARMA graph filters are practically
appealing for static and time-varying settings, as predicted by theoretical
derivations.
|
[{'version': 'v1', 'created': 'Sun, 14 Feb 2016 10:14:54 GMT'}
{'version': 'v2', 'created': 'Wed, 21 Sep 2016 14:34:07 GMT'}]
|
2017-09-18
|
[array(['Isufi', 'Elvin', ''], dtype=object)
array(['Loukas', 'Andreas', ''], dtype=object)
array(['Simonetto', 'Andrea', ''], dtype=object)
array(['Leus', 'Geert', ''], dtype=object)]
|
1,933 |
1705.01339
|
Qionglin Dai
|
Qionglin Dai, Mengya Zhang, Hongyan Cheng, Haihong Li, Fagen Xie, and
Junzhong Yang
|
From collective oscillation to chimera state in a nonlocally excitable
system
|
11 pages, 5 figures
| null | null | null |
nlin.AO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Chimera states, which consist of coexisting domains of spatially coherent and
incoherent dynamics, have been widely found in nonlocally coupled oscillatory
systems. We demonstrate for the first time that chimera states can emerge from
excitable systems under nonlocal coupling in which isolated units only allow
for the equilibrium. We theoretically reveal that nonlocal coupling induced
collective oscillation is behind the occurrence of the chimera states. We find
two different types of chimera states, phase-chimera state and
excitability-chimera states, depending on the coupling strength. At weak
coupling strength where collective oscillation is localized around the unstable
homogeneous equilibrium, the chimera states are similar to the ones in
nonlocally coupled phase oscillators. For the chimera states at strong coupling
strength, the dynamics of both coherent units and incoherent units shift back
and forth between low amplitude oscillation induced by collective oscillation
and high amplitude oscillation induced by excitability of local units.
|
[{'version': 'v1', 'created': 'Wed, 3 May 2017 10:05:15 GMT'}]
|
2017-05-04
|
[array(['Dai', 'Qionglin', ''], dtype=object)
array(['Zhang', 'Mengya', ''], dtype=object)
array(['Cheng', 'Hongyan', ''], dtype=object)
array(['Li', 'Haihong', ''], dtype=object)
array(['Xie', 'Fagen', ''], dtype=object)
array(['Yang', 'Junzhong', ''], dtype=object)]
|
1,934 |
hep-ph/0701085
|
J\"urgen Rohrwild
|
J. Rohrwild
|
Light-cone sum rules for the $N\gamma\Delta$ transitions for real
photons
|
34 pages, 9 figures, revised version, published in Phys. Rev. D, one
misplaced reference corrected
|
Phys.Rev.D75:074025,2007
|
10.1103/PhysRevD.75.074025
| null |
hep-ph
| null |
We examine the radiative $\Delta \to \gamma N$ transition at the real photon
point $Q^2=0$ using the framework of light-cone QCD sum rules. In particular,
the sum rules for the transition form factors $G_M(0)$ and $R_{EM}$ are
determined up to twist 4. The result for $G_M(0)$ agrees with experiment within
10% accuracy. The agreement for $R_{EM}$ is also reasonable. In addition, we
derive new light-cone sum rules for the magnetic moments of nucleons, with a
complete account of twist-4 corrections based on a recent reanalysis of photon
distribution amplitudes.
|
[{'version': 'v1', 'created': 'Thu, 11 Jan 2007 11:50:29 GMT'}
{'version': 'v2', 'created': 'Fri, 19 Jan 2007 14:01:33 GMT'}
{'version': 'v3', 'created': 'Tue, 15 May 2007 07:44:36 GMT'}]
|
2008-11-26
|
[array(['Rohrwild', 'J.', ''], dtype=object)]
|
1,935 |
2101.12309
|
David Spierings Van Der Wolk
|
David C. Spierings and Aephraim M. Steinberg
|
Observation of the Decrease of Larmor Tunneling Times with Lower
Incident Energy
|
Corrected typos, revised title to be consistent with journal version,
results unchanged
|
Phys. Rev. Lett. 127, 133001 (2021)
|
10.1103/PhysRevLett.127.133001
| null |
quant-ph physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
How much time does a tunneling particle spend in a barrier? A Larmor clock,
one proposal to answer this question, measures the interaction between the
particle and the barrier region using an auxiliary degree of freedom of the
particle to clock the dwell time inside the barrier. We report on precise
Larmor time measurements of ultra-cold $^{87}$Rb atoms tunneling through an
optical barrier, which confirm longstanding predictions of tunneling times. We
observe that atoms generally spend less time tunneling through higher barriers
and that this time decreases for lower energy particles. For the lowest
measured incident energy, at least $90\%$ of transmitted atoms tunneled through
the barrier, spending an average of $0.59(2)$ms inside. This is $0.11(3)$ms
faster than atoms traversing the same barrier with energy close to the
barrier's peak and $0.21(3)$ms faster than when the atoms traverse a barrier
with $23\%$ less energy.
|
[{'version': 'v1', 'created': 'Thu, 28 Jan 2021 22:38:13 GMT'}
{'version': 'v2', 'created': 'Sat, 1 Jan 2022 20:16:06 GMT'}]
|
2022-01-04
|
[array(['Spierings', 'David C.', ''], dtype=object)
array(['Steinberg', 'Aephraim M.', ''], dtype=object)]
|
1,936 |
1704.03181
|
Yuya Ohmichi
|
Yuya Ohmichi
|
Preconditioned dynamic mode decomposition and mode selection algorithms
for large datasets using incremental proper orthogonal decomposition
| null |
AIP Advances 7, 075318 (2017)
|
10.1063/1.4996024
| null |
physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This note proposes a simple and general framework of dynamic mode
decomposition (DMD) and a mode selection for large datasets. The proposed
framework explicitly introduces a preconditioning step using an incremental
proper orthogonal decomposition to DMD and mode selection algorithms. By
performing the preconditioning step, the DMD and the mode selection can be
performed with low memory consumption and small computational complexity and
can be applied to large datasets. In addition, a simple mode selection
algorithm based on a greedy method is proposed. The proposed framework is
applied to the analysis of a three-dimensional flows around a circular
cylinder.
|
[{'version': 'v1', 'created': 'Tue, 11 Apr 2017 07:46:50 GMT'}
{'version': 'v2', 'created': 'Thu, 20 Jul 2017 10:34:22 GMT'}]
|
2017-08-02
|
[array(['Ohmichi', 'Yuya', ''], dtype=object)]
|
1,937 |
1310.4384
|
R. M. L. Evans
|
Milos Knezevic and R. M. L. Evans
|
Numerical comparison of a constrained path ensemble and a driven
quasisteady state
|
9 pages, 17 figure panels
|
Phys. Rev. E 89, 012132 (2014)
|
10.1103/PhysRevE.89.012132
| null |
cond-mat.stat-mech cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the correspondence between a non-equilibrium ensemble defined
via the distribution of phase-space paths of a Hamiltonian system, and a system
driven into a steady-state by non-equilibrium boundary conditions. To discover
whether the non-equilibrium path ensemble adequately describes the physics of a
driven system, we measure transition rates in a simple one-dimensional model of
rotors with Newtonian dynamics and purely conservative interactions. We compare
those rates with known properties of the non-equilibrium path ensemble. In
doing so, we establish effective protocols for the analysis of transition rates
in non-equilibrium quasi-steady states. Transition rates between potential
wells and also between phase-space elements are studied, and found to exhibit
distinct properties, the more coarse-grained potential wells being effectively
further from equilibrium. In all cases the results from the boundary-driven
system are close to the path-ensemble predictions, but the question of
equivalence of the two remains open.
|
[{'version': 'v1', 'created': 'Wed, 16 Oct 2013 14:05:11 GMT'}
{'version': 'v2', 'created': 'Fri, 24 Jan 2014 13:19:58 GMT'}]
|
2014-01-27
|
[array(['Knezevic', 'Milos', ''], dtype=object)
array(['Evans', 'R. M. L.', ''], dtype=object)]
|
1,938 |
1711.03314
|
Ivan Yegorov (Egorov)
|
Ivan Yegorov and Peter Dower
|
Perspectives on characteristics based curse-of-dimensionality-free
numerical approaches for solving Hamilton-Jacobi equations
|
45 pages, 10 figures
|
Applied Mathematics & Optimization, 2018
|
10.1007/s00245-018-9509-6
| null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper extends the considerations of the works [1, 2] regarding
curse-of-dimensionality-free numerical approaches to solve certain types of
Hamilton-Jacobi equations arising in optimal control problems, differential
games and elsewhere. A rigorous formulation and justification for the extended
Hopf-Lax formula of [2] is provided together with novel theoretical and
practical discussions including useful recommendations. By using the method of
characteristics, the solutions of some problem classes under
convexity/concavity conditions on Hamiltonians (in particular, the solutions of
Hamilton-Jacobi-Bellman equations in optimal control problems) are evaluated
separately at different initial positions. This allows for the avoidance of the
curse of dimensionality, as well as for choosing arbitrary computational
regions. The corresponding feedback control strategies are obtained at selected
positions without approximating the partial derivatives of the solutions. The
results of numerical simulations demonstrate the high potential of the proposed
techniques. It is also pointed out that, despite the indicated advantages, the
related approaches still have a limited range of applicability, and their
extensions to Hamilton-Jacobi-Isaacs equations in zero-sum two-player
differential games are currently developed only for sufficiently narrow classes
of control systems. That is why further extensions are worth investigating.
|
[{'version': 'v1', 'created': 'Thu, 9 Nov 2017 10:28:47 GMT'}]
|
2019-01-29
|
[array(['Yegorov', 'Ivan', ''], dtype=object)
array(['Dower', 'Peter', ''], dtype=object)]
|
1,939 |
1506.07918
|
Marco Bertola
|
Marco Bertola, Dmitry Korotkin, Chaya Norton
|
Symplectic geometry of the moduli space of projective structures in
homological coordinates
|
37 pages, 5 figures
| null | null | null |
math.SG hep-th math-ph math.AG math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a natural symplectic structure on the moduli space of quadratic
differentials with simple zeros and describe its Darboux coordinate systems in
terms of so-called homological coordinates. We then show that this structure
coincides with the canonical Poisson structure on the cotangent bundle of the
moduli space of Riemann surfaces, and therefore the homological coordinates
provide a new system of Darboux coordinates. We define a natural family of
commuting "homological flows" on the moduli space of quadratic differentials
and find the corresponding action-angle variables.
The space of projective structures over the moduli space can be identified
with the cotangent bundle upon selection of a reference projective connection
that varies holomorphically and thus can be naturally endowed with a symplectic
structure. Different choices of projective connections of this kind (Bergman,
Schottky, Wirtinger) give rise to equivalent symplectic structures on the space
of projective connections but different symplectic polarizations: the
corresponding generating functions are found. We also study the monodromy
representation of the Schwarzian equation associated with a projective
connection, and we show that the natural symplectic structure on the the space
of projective connections induces the Goldman Poisson structure on the
character variety. Combined with results of Kawai, this result shows the
symplectic equivalence between the embeddings of the cotangent bundle into the
space of projective structures given by the Bers and Bergman projective
connections.
|
[{'version': 'v1', 'created': 'Thu, 25 Jun 2015 23:03:30 GMT'}]
|
2015-07-03
|
[array(['Bertola', 'Marco', ''], dtype=object)
array(['Korotkin', 'Dmitry', ''], dtype=object)
array(['Norton', 'Chaya', ''], dtype=object)]
|
1,940 |
2209.14093
|
Ashish Gupta
|
Priyesh Ranjan, Ashish Gupta, Federico Cor\`o, and Sajal K. Das
|
Securing Federated Learning against Overwhelming Collusive Attackers
|
7 Figures, 2 Tables
| null | null | null |
cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
In the era of a data-driven society with the ubiquity of Internet of Things
(IoT) devices storing large amounts of data localized at different places,
distributed learning has gained a lot of traction, however, assuming
independent and identically distributed data (iid) across the devices. While
relaxing this assumption that anyway does not hold in reality due to the
heterogeneous nature of devices, federated learning (FL) has emerged as a
privacy-preserving solution to train a collaborative model over non-iid data
distributed across a massive number of devices. However, the appearance of
malicious devices (attackers), who intend to corrupt the FL model, is
inevitable due to unrestricted participation. In this work, we aim to identify
such attackers and mitigate their impact on the model, essentially under a
setting of bidirectional label flipping attacks with collusion. We propose two
graph theoretic algorithms, based on Minimum Spanning Tree and k-Densest graph,
by leveraging correlations between local models. Our FL model can nullify the
influence of attackers even when they are up to 70% of all the clients whereas
prior works could not afford more than 50% of clients as attackers. The
effectiveness of our algorithms is ascertained through experiments on two
benchmark datasets, namely MNIST and Fashion-MNIST, with overwhelming
attackers. We establish the superiority of our algorithms over the existing
ones using accuracy, attack success rate, and early detection round.
|
[{'version': 'v1', 'created': 'Wed, 28 Sep 2022 13:41:04 GMT'}]
|
2022-09-29
|
[array(['Ranjan', 'Priyesh', ''], dtype=object)
array(['Gupta', 'Ashish', ''], dtype=object)
array(['Corò', 'Federico', ''], dtype=object)
array(['Das', 'Sajal K.', ''], dtype=object)]
|
1,941 |
2110.00718
|
Ishay Haviv
|
Inon Attias and Ishay Haviv
|
Local Orthogonality Dimension
|
29 pages
| null | null | null |
math.CO cs.IT math.AT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An orthogonal representation of a graph $G$ over a field $\mathbb{F}$ is an
assignment of a vector $u_v \in \mathbb{F}^t$ to every vertex $v$ of $G$, such
that $\langle u_v,u_v \rangle \neq 0$ for every vertex $v$ and $\langle
u_v,u_{v'} \rangle = 0$ whenever $v$ and $v'$ are adjacent in $G$. The locality
of the orthogonal representation is the largest dimension of a subspace spanned
by the vectors associated with a closed neighborhood in the graph. We introduce
a novel graph parameter, called the local orthogonality dimension, defined for
a given graph $G$ and a given field $\mathbb{F}$, as the smallest possible
locality of an orthogonal representation of $G$ over $\mathbb{F}$. We
investigate the usefulness of topological methods for proving lower bounds on
the local orthogonality dimension. We prove that graphs for which topological
methods imply a lower bound of $t$ on their chromatic number have local
orthogonality dimension at least $\lceil t/2 \rceil +1$ over every field,
strengthening a result of Simonyi and Tardos on the local chromatic number. We
show that for certain graphs this lower bound is tight, whereas for others, the
local orthogonality dimension over the reals is equal to the chromatic number.
More generally, we prove that for every complement of a line graph, the local
orthogonality dimension over $\mathbb{R}$ coincides with the chromatic number.
This strengthens a recent result by Daneshpajouh, Meunier, and Mizrahi, who
proved that the local and standard chromatic numbers of these graphs are equal.
As another extension of their result, we prove that the local and standard
chromatic numbers are equal for some additional graphs, from the family of
Kneser graphs. We also show an $\mathsf{NP}$-hardness result for the local
orthogonality dimension and present an application of this graph parameter to
the index coding problem from information theory.
|
[{'version': 'v1', 'created': 'Sat, 2 Oct 2021 03:41:04 GMT'}
{'version': 'v2', 'created': 'Fri, 7 Apr 2023 14:07:11 GMT'}]
|
2023-04-10
|
[array(['Attias', 'Inon', ''], dtype=object)
array(['Haviv', 'Ishay', ''], dtype=object)]
|
1,942 |
1904.06122
|
Varun Jain
|
Varun Jain, Ramya Hebbalaguppe
|
AirPen: A Touchless Fingertip Based Gestural Interface for Smartphones
and Head-Mounted Devices
|
Presented at the CHI'19 Workshop: Addressing the Challenges of
Situationally-Induced Impairments and Disabilities in Mobile Interaction,
2019 (arXiv:1904.05382)
| null | null |
SIID/2019/no05
|
cs.HC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hand gestures are an intuitive, socially acceptable, and a non-intrusive
interaction modality in Mixed Reality (MR) and smartphone based applications.
Unlike speech interfaces, they tend to perform well even in shared and public
spaces. Hand gestures can also be used to interact with smartphones in
situations where the user's ability to physically touch the device is impaired.
However, accurate gesture recognition can be achieved through state-of-the-art
deep learning models or with the use of expensive sensors. Despite the
robustness of these deep learning models, they are computationally heavy and
memory hungry, and obtaining real-time performance on-device without additional
hardware is still a challenge. To address this, we propose AirPen: an analogue
to pen on paper, but in air, for in-air writing and gestural commands that
works seamlessly in First and Second Person View. The models are trained on a
GPU machine and ported on an Android smartphone. AirPen comprises of three deep
learning models that work in tandem: MobileNetV2 for hand localisation, our
custom fingertip regression architecture followed by a Bi-LSTM model for
gesture classification. The overall framework works in real-time on mobile
devices and achieves a classification accuracy of 80% with an average latency
of only 0.12 s.
|
[{'version': 'v1', 'created': 'Fri, 12 Apr 2019 09:29:01 GMT'}]
|
2019-04-15
|
[array(['Jain', 'Varun', ''], dtype=object)
array(['Hebbalaguppe', 'Ramya', ''], dtype=object)]
|
1,943 |
2004.09938
|
Ryan Mann
|
Ryan L. Mann, Luke Mathieson, Catherine Greenhill
|
On the Parameterised Complexity of Induced Multipartite Graph Parameters
|
8 pages, 0 figures
| null | null | null |
cs.CC cs.DM cs.DS math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a family of graph parameters, called induced multipartite graph
parameters, and study their computational complexity. First, we consider the
following decision problem: an instance is an induced multipartite graph
parameter $p$ and a given graph $G$, and for natural numbers $k\geq2$ and
$\ell$, we must decide whether the maximum value of $p$ over all induced
$k$-partite subgraphs of $G$ is at most $\ell$. We prove that this problem is
W[1]-hard. Next, we consider a variant of this problem, where we must decide
whether the given graph $G$ contains a sufficiently large induced $k$-partite
subgraph $H$ such that $p(H)\leq\ell$. We show that for certain parameters this
problem is para-NP-hard, while for others it is fixed-parameter tractable.
|
[{'version': 'v1', 'created': 'Tue, 21 Apr 2020 12:15:06 GMT'}
{'version': 'v2', 'created': 'Thu, 4 May 2023 00:32:41 GMT'}]
|
2023-05-05
|
[array(['Mann', 'Ryan L.', ''], dtype=object)
array(['Mathieson', 'Luke', ''], dtype=object)
array(['Greenhill', 'Catherine', ''], dtype=object)]
|
1,944 |
2207.06344
|
Johannes Fischer
|
Johannes Fischer
|
Pinching Azumaya algebras
|
minor changes, to appear in J. Pure Appl. Algebra
| null |
10.1016/j.jpaa.2023.107406
| null |
math.AG
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We show, that for a morphism of schemes from X to Y, that is a finite
modification in finitely many closed points, a cohomological Brauer class on Y
is represented by an Azumaya algebra if its pullback to X is represented by an
Azumaya algebra. Part of the proof uses an extension of a result by Ferrand, on
pinching of finite locally free sheaves, to Azumaya algebras.
|
[{'version': 'v1', 'created': 'Wed, 13 Jul 2022 16:59:50 GMT'}
{'version': 'v2', 'created': 'Fri, 14 Apr 2023 10:12:27 GMT'}]
|
2023-04-17
|
[array(['Fischer', 'Johannes', ''], dtype=object)]
|
1,945 |
1410.5166
|
Kamal C
|
C. Kamal and Motohiko Ezawa
|
Arsenene: Two-dimensional buckled and puckered honeycomb arsenic systems
|
5 figures, 1 table
|
Phys. Rev. B. 91, 085423 (2015)
|
10.1103/PhysRevB.91.085423
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently phosphorene, monolayer honeycomb structure of black phosphorus, was
experimentally manufactured and attracts rapidly growing interests. Here we
investigate stability and electronic properties of honeycomb structure of
arsenic system based on first principle calculations. Two types of honeycomb
structures, buckled and puckered, are found to be stable. We call them arsenene
as in the case of phosphorene. We find that both the buckled and puckered
arsenene possess indirect gaps. We show that the band gap of the puckered and
buckled arsenene can be tuned by applying strain. The gap closing occurs at 6%
strain for puckered arsenene, where the bond angles between the nearest
neighbour become nearly equal. An indirect-to-direct gap transition occurs by
applying strain. Especially, 1% strain is enough to transform the puckered
arsenene into a direct-gap semiconductor. Our results will pave a way for
applications to light-emitting diodes and solar cells.
|
[{'version': 'v1', 'created': 'Mon, 20 Oct 2014 06:50:29 GMT'}]
|
2015-02-26
|
[array(['Kamal', 'C.', ''], dtype=object)
array(['Ezawa', 'Motohiko', ''], dtype=object)]
|
1,946 |
math/0603636
|
Jaime San Martin
|
Jorge A. Leon, Jaime San Martin
|
Linear Stochastic Differential Equations Driven by a Fractional Brownian
Motion with Hurst Parameter less than 1/2
| null | null | null | null |
math.PR math.ST stat.TH
| null |
In this paper we use the chaos decomposition approach to establish the
existence of a unique continuous solution to linear fractional differential
equations of the Skorohod type. Here the coefficients are deterministic, the
inital condition is anticipating and the underlying fractional Brownian motion
has Hurst parameter less than 1/2. We provide an explicit expression for the
chaos decomposition of the solution in order to show our results.
|
[{'version': 'v1', 'created': 'Tue, 28 Mar 2006 00:12:24 GMT'}]
|
2007-06-13
|
[array(['Leon', 'Jorge A.', ''], dtype=object)
array(['Martin', 'Jaime San', ''], dtype=object)]
|
1,947 |
1907.12162
|
Petr Marek
|
Petr Marek
|
Hybrid Code Networks using a convolutional neural network as an input
layer achieves higher turn accuracy
|
Proceedings of the International Student Scientific Conference Poster
23/2019
| null | null | null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dialogue management is a task of conversational artificial intelligence.
The goal of the dialogue manager is to select the appropriate response to the
conversational partner conditioned by the input message and recent dialogue
state. Hybrid Code Networks is one of the models of dialogue managers, which
uses an average of word embeddings and bag-of-words as input features. We
perform experiments on Dialogue bAbI Task 6 and Alquist Conversational Dataset.
The experiments show that the convolutional neural network used as an input
layer of the Hybrid Code Network improves the model's turn accuracy.
|
[{'version': 'v1', 'created': 'Sun, 28 Jul 2019 23:41:53 GMT'}]
|
2019-07-30
|
[array(['Marek', 'Petr', ''], dtype=object)]
|
1,948 |
2011.04684
|
Bilal Hammoud
|
Bilal Hammoud, Majid Khadiv, Ludovic Righetti
|
Impedance Optimization for Uncertain Contact Interactions Through Risk
Sensitive Optimal Control
|
8 pages, 11 figures
| null | null | null |
cs.RO cs.SY eess.SY
|
http://creativecommons.org/licenses/by/4.0/
|
This paper addresses the problem of computing optimal impedance schedules for
legged locomotion tasks involving complex contact interactions. We formulate
the problem of impedance regulation as a trade-off between disturbance
rejection and measurement uncertainty. We extend a stochastic optimal control
algorithm known as Risk Sensitive Control to take into account measurement
uncertainty and propose a formal way to include such uncertainty for unknown
contact locations. The approach can efficiently generate optimal state and
control trajectories along with local feedback control gains, i.e. impedance
schedules. Extensive simulations demonstrate the capabilities of the approach
in generating meaningful stiffness and damping modulation patterns before and
after contact interaction. For example, contact forces are reduced during early
contacts, damping increases to anticipate a high impact event and tracking is
automatically traded-off for increased stability. In particular, we show a
significant improvement in performance during jumping and trotting tasks with a
simulated quadruped robot.
|
[{'version': 'v1', 'created': 'Mon, 9 Nov 2020 19:04:53 GMT'}
{'version': 'v2', 'created': 'Mon, 25 Jan 2021 14:49:19 GMT'}]
|
2021-01-26
|
[array(['Hammoud', 'Bilal', ''], dtype=object)
array(['Khadiv', 'Majid', ''], dtype=object)
array(['Righetti', 'Ludovic', ''], dtype=object)]
|
1,949 |
2205.03325
|
Yu-Shun Hsiao
|
Tianyu Jia, En-Yu Yang, Yu-Shun Hsiao, Jonathan Cruz, David Brooks,
Gu-Yeon Wei, Vijay Janapa Reddi
|
OMU: A Probabilistic 3D Occupancy Mapping Accelerator for Real-time
OctoMap at the Edge
|
2022 Design Automation and Test in Europe Conference (DATE), March
14-23, 2022, Virtual
| null | null | null |
cs.AR cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Autonomous machines (e.g., vehicles, mobile robots, drones) require
sophisticated 3D mapping to perceive the dynamic environment. However,
maintaining a real-time 3D map is expensive both in terms of compute and memory
requirements, especially for resource-constrained edge machines. Probabilistic
OctoMap is a reliable and memory-efficient 3D dense map model to represent the
full environment, with dynamic voxel node pruning and expansion capacity. This
paper presents the first efficient accelerator solution, i.e. OMU, to enable
real-time probabilistic 3D mapping at the edge. To improve the performance, the
input map voxels are updated via parallel PE units for data parallelism. Within
each PE, the voxels are stored using a specially developed data structure in
parallel memory banks. In addition, a pruning address manager is designed
within each PE unit to reuse the pruned memory addresses. The proposed 3D
mapping accelerator is implemented and evaluated using a commercial 12 nm
technology. Compared to the ARM Cortex-A57 CPU in the Nvidia Jetson TX2
platform, the proposed accelerator achieves up to 62$\times$ performance and
708$\times$ energy efficiency improvement. Furthermore, the accelerator
provides 63 FPS throughput, more than 2$\times$ higher than a real-time
requirement, enabling real-time perception for 3D mapping.
|
[{'version': 'v1', 'created': 'Fri, 6 May 2022 16:03:13 GMT'}]
|
2022-05-09
|
[array(['Jia', 'Tianyu', ''], dtype=object)
array(['Yang', 'En-Yu', ''], dtype=object)
array(['Hsiao', 'Yu-Shun', ''], dtype=object)
array(['Cruz', 'Jonathan', ''], dtype=object)
array(['Brooks', 'David', ''], dtype=object)
array(['Wei', 'Gu-Yeon', ''], dtype=object)
array(['Reddi', 'Vijay Janapa', ''], dtype=object)]
|
1,950 |
1803.01026
|
Thurman-Keup, Randy M.
|
R. Thurman-Keup, A.H. Lumpkin, J. Thangaraj (Fermilab)
|
An optical and terahertz instrumentation system at the FAST linac at
Fermilab
|
5 pp
| null | null |
Fermilab-Conf-17-369-AD
|
physics.acc-ph
|
http://creativecommons.org/licenses/by/4.0/
|
FAST is a facility at Fermilab that consists of a photoinjector, two
superconducting capture cavities, one superconducting ILC-style cryomodule, and
a small ring for studying non-linear, integrable beam optics called IOTA. This
paper discusses the layout for the optical transport system that provides
optical radiation to an externally located streak camera for bunch length
measurements, and THz radiation to a Martin-Puplett interferometer, also for
bunch length measurements. It accepts radiation from two synchrotron radiation
ports in a chicane bunch compressor and a diffraction/transition radiation
screen downstream of the compressor. It also has the potential to access signal
from a transition radiation screen or YAG screen after the spectrometer magnet
for measurements of energy-time correlations. Initial results from both the
streak camera and Martin-Puplett will be presented.
|
[{'version': 'v1', 'created': 'Fri, 2 Mar 2018 19:54:45 GMT'}]
|
2018-03-06
|
[array(['Thurman-Keup', 'R.', '', 'Fermilab'], dtype=object)
array(['Lumpkin', 'A. H.', '', 'Fermilab'], dtype=object)
array(['Thangaraj', 'J.', '', 'Fermilab'], dtype=object)]
|
1,951 |
2301.10728
|
Enrico Virgilli
|
N. Auricchio, L. Ferro, J. B. Stephen, E. Caroli, E. Virgilli, O.
Limousin, M. Moita, Y. Gutierrez, D. Geoffrey, R. Le Breton, A. Meuris, S.
Del Sordo, F. Frontera, P. Rosati, C. Ferrari, R. Lolli, C. Gargano, S.
Squerzanti
|
CdTe Spectroscopic-Imager Measurements with Bent Crystals for Broad Band
Laue Lenses
|
7 pages, 22 figures, 2022 IEEE Nuclear Science Symposium, Medical
Imaging Conference and Room Temperature Semiconductor Detector Conference
(NSS/MIC/RTSD)
| null | null | null |
astro-ph.IM physics.ins-det
|
http://creativecommons.org/licenses/by/4.0/
|
In astrophysics, several key questions in the hard X soft Gamma-ray range
(above 100 keV) require sensitivity and angular resolution that are hardly
achievable with current technologies. Therefore, a new kind of instrument able
to focus hard X and gamma-rays is essential. Broad band Laue lenses seem to be
the only solution to fulfil these requirements, significantly improving the
sensitivity and angular resolution of the X and gamma-ray telescopes. This type
of high-energy optics will require highly performing focal plane detectors in
terms of detection efficiency, spatial resolution, and spectroscopy. This paper
presents the results obtained in the project 'Technological Readiness Increase
for Laue Lenses (TRILL)' framework using a Caliste-HD detector module. This
detector is a pixel spectrometer developed at CEA (Commissariat a Energie
Atomique, Saclay, France). It is used to acquire spectroscopic images of the
focal spot produced by Laue Lens bent crystals under a hard X-ray beam at the
LARIX facility (University of Ferrara, Italy).
|
[{'version': 'v1', 'created': 'Wed, 25 Jan 2023 17:33:53 GMT'}]
|
2023-01-26
|
[array(['Auricchio', 'N.', ''], dtype=object)
array(['Ferro', 'L.', ''], dtype=object)
array(['Stephen', 'J. B.', ''], dtype=object)
array(['Caroli', 'E.', ''], dtype=object)
array(['Virgilli', 'E.', ''], dtype=object)
array(['Limousin', 'O.', ''], dtype=object)
array(['Moita', 'M.', ''], dtype=object)
array(['Gutierrez', 'Y.', ''], dtype=object)
array(['Geoffrey', 'D.', ''], dtype=object)
array(['Breton', 'R. Le', ''], dtype=object)
array(['Meuris', 'A.', ''], dtype=object)
array(['Del Sordo', 'S.', ''], dtype=object)
array(['Frontera', 'F.', ''], dtype=object)
array(['Rosati', 'P.', ''], dtype=object)
array(['Ferrari', 'C.', ''], dtype=object)
array(['Lolli', 'R.', ''], dtype=object)
array(['Gargano', 'C.', ''], dtype=object)
array(['Squerzanti', 'S.', ''], dtype=object)]
|
1,952 |
1410.5964
|
Scientific Information Service CERN
|
S. Paret (LBNL, Berkeley), J. Qiang (LBNL, Berkeley)
|
Simulation of beam-beam induced emittance growth in the HL-LHC with crab
cavities
|
6 pages, contribution to the ICFA Mini-Workshop on Beam-Beam Effects
in Hadron Colliders, CERN, Geneva, Switzerland, 18-22 Mar 2013
|
CERN Yellow Report CERN-2014-004, pp.237-242
|
10.5170/CERN-2014-004.237
| null |
physics.acc-ph
|
http://creativecommons.org/licenses/by/3.0/
|
The emittance growth in the HL-LHC due to beam-beam effects is examined by
virtue of strong-strong computer simulations. A model of the transverse damper
and the noise level have been tuned to simulate the emittance growth in the
present LHC. Simulations with projected HL-LHC beam parameters and crab
cavities are discussed. It is shown that with the nominal working point, the
large beam-beam tune shift moves the beam into a resonance that causes
substantial emittance growth. Increasing the working point slightly is
demonstrated to be very beneficial.
|
[{'version': 'v1', 'created': 'Wed, 22 Oct 2014 09:22:47 GMT'}]
|
2014-10-23
|
[array(['Paret', 'S.', '', 'LBNL, Berkeley'], dtype=object)
array(['Qiang', 'J.', '', 'LBNL, Berkeley'], dtype=object)]
|
1,953 |
1812.06120
|
Kathy Jang
|
Kathy Jang, Eugene Vinitsky, Behdad Chalaki, Ben Remer, Logan Beaver,
Andreas Malikopoulos, Alexandre Bayen
|
Simulation to Scaled City: Zero-Shot Policy Transfer for Traffic Control
via Autonomous Vehicles
|
To be published at the International Conference on Cyber Physical
Systems (ICCPS) 2019. 10 pages, 9 figures
| null | null | null |
cs.SY cs.AI cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using deep reinforcement learning, we train control policies for autonomous
vehicles leading a platoon of vehicles onto a roundabout. Using Flow, a library
for deep reinforcement learning in micro-simulators, we train two policies, one
policy with noise injected into the state and action space and one without any
injected noise. In simulation, the autonomous vehicle learns an emergent
metering behavior for both policies in which it slows to allow for smoother
merging. We then directly transfer this policy without any tuning to the
University of Delaware Scaled Smart City (UDSSC), a 1:25 scale testbed for
connected and automated vehicles. We characterize the performance of both
policies on the scaled city. We show that the noise-free policy winds up
crashing and only occasionally metering. However, the noise-injected policy
consistently performs the metering behavior and remains collision-free,
suggesting that the noise helps with the zero-shot policy transfer.
Additionally, the transferred, noise-injected policy leads to a 5% reduction of
average travel time and a reduction of 22% in maximum travel time in the UDSSC.
Videos of the controllers can be found at
https://sites.google.com/view/iccps-policy-transfer.
|
[{'version': 'v1', 'created': 'Fri, 14 Dec 2018 19:20:09 GMT'}
{'version': 'v2', 'created': 'Fri, 22 Feb 2019 21:41:17 GMT'}]
|
2019-02-26
|
[array(['Jang', 'Kathy', ''], dtype=object)
array(['Vinitsky', 'Eugene', ''], dtype=object)
array(['Chalaki', 'Behdad', ''], dtype=object)
array(['Remer', 'Ben', ''], dtype=object)
array(['Beaver', 'Logan', ''], dtype=object)
array(['Malikopoulos', 'Andreas', ''], dtype=object)
array(['Bayen', 'Alexandre', ''], dtype=object)]
|
1,954 |
1803.06364
|
Tom\'a\v{s} Bzdu\v{s}ek
|
Xiao-Qi Sun, Shou-Cheng Zhang, Tom\'a\v{s} Bzdu\v{s}ek
|
Conversion rules for Weyl points and nodal lines in topological media
|
Main text: 4 pages with 4 figures. Supplement (submitted as ancillary
file): 19 pages with 9 figures
|
Phys. Rev. Lett. 121, 106402 (2018)
|
10.1103/PhysRevLett.121.106402
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
According to a widely-held paradigm, a pair of Weyl points with opposite
chirality mutually annihilate when brought together. In contrast, we show that
such a process is strictly forbidden for Weyl points related by a mirror
symmetry, provided that an effective two-band description exists in terms of
orbitals with opposite mirror eigenvalue. Instead, such a pair of Weyl points
convert into a nodal loop inside a symmetric plane upon the collision. Similar
constraints are identified for systems with multiple mirrors, facilitating
previously unreported nodal-line and nodal-chain semimetals that exhibit both
Fermi-arc and drumhead surface states. We further find that Weyl points in
systems symmetric under a $\pi$-rotation composed with time-reversal are
characterized by an additional integer charge that we call helicity. A pair of
Weyl points with opposite chirality can annihilate only if their helicities
also cancel out. We base our predictions on topological crystalline invariants
derived from relative homotopy theory, and we test our predictions on simple
tight-binding models. The outlined homotopy description can be directly
generalized to systems with multiple bands and other choices of symmetry.
|
[{'version': 'v1', 'created': 'Fri, 16 Mar 2018 18:29:23 GMT'}
{'version': 'v2', 'created': 'Fri, 8 Jun 2018 17:45:25 GMT'}
{'version': 'v3', 'created': 'Wed, 5 Sep 2018 17:26:58 GMT'}]
|
2018-09-06
|
[array(['Sun', 'Xiao-Qi', ''], dtype=object)
array(['Zhang', 'Shou-Cheng', ''], dtype=object)
array(['Bzdušek', 'Tomáš', ''], dtype=object)]
|
1,955 |
1904.05013
|
Yu Guo
|
Yu Guo, Yanjie Li, Qingzhao Liu, Hanhui Jin, Dandan Xu, Carl Wassgren,
Jennifer Curtis
|
Yielding and hardening of flexible fiber packings during triaxial
compression
|
14 pages, 4 figures
|
AIChE Journal. 2020 Jun;66(6):e16946
|
10.1002/aic.16946
| null |
cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper examines the mechanical response of flexible fiber packings
subject to triaxial compression. Short fibers yield in a manner similar to
typical granular materials in which the deviatoric stress remains nearly
constant with increasing strain after reaching a peak value. Interestingly,
long fibers exhibit a hardening behavior, where the stress increases rapidly
with increasing strain at large strains and the packing density continuously
increases. Phase diagrams for classifying the bulk mechanical response as
yielding, hardening, or a transition regime are generated as a function of the
fiber aspect ratio, fiber-fiber friction coefficient, and confining pressure.
Large fiber aspect ratio, large fiber-fiber friction coefficient, and large
confining pressure promote hardening behavior. The hardening packings can
support much larger loads than the yielding packings contributing to the
stability and consolidation of the granular structure, but larger internal
axial forces occur within fibers.
|
[{'version': 'v1', 'created': 'Wed, 10 Apr 2019 06:16:19 GMT'}]
|
2023-01-18
|
[array(['Guo', 'Yu', ''], dtype=object)
array(['Li', 'Yanjie', ''], dtype=object)
array(['Liu', 'Qingzhao', ''], dtype=object)
array(['Jin', 'Hanhui', ''], dtype=object)
array(['Xu', 'Dandan', ''], dtype=object)
array(['Wassgren', 'Carl', ''], dtype=object)
array(['Curtis', 'Jennifer', ''], dtype=object)]
|
1,956 |
1903.08087
|
Monika Varga-Kofarago
|
Monika Varga-Kofarago (for the Bergen pCT collaboration)
|
Proton CT -- a novel diagnostic tool in cancer therapy
|
5 pages, 5 figures, proceedings for the 19. Zimanyi School Winter
Workshop on Heavy Ion Physics
| null | null | null |
physics.med-ph physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Radiotherapy is one of the main methods in the successful treatment of
cancer. The tumor is irradiated with photons or charged particles (e.g.
protons), and in the case of massive charged particles, the treatment results
in less unnecessary dose outside the tumor and therefore less side effects for
the patient and a faster recovery. However, the dose planning of hadron therapy
is calculated from photon CT measurements, which results in large uncertainties
in the planning and therefore in a necessary enlargement of the treatment area.
This uncertainty can be reduced by performing the CT scan using protons. The
current contribution shows the development of a sampling calorimeter for proton
CT measurements and describes the state of the project.
|
[{'version': 'v1', 'created': 'Mon, 18 Mar 2019 15:45:13 GMT'}]
|
2019-03-20
|
[array(['Varga-Kofarago', 'Monika', '', 'for the Bergen pCT collaboration'],
dtype=object) ]
|
1,957 |
1005.0010
|
Todd Parsons
|
Todd L. Parsons
|
Limit Theorems for Competitive Density Dependent Population Processes
|
This paper has been withdrawn by the author. The proofs herein
contain errors. I do not intend to prepare a revised version
| null | null | null |
math.PR q-bio.PE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Near the beginning of the century, Wright and Fisher devised an elegant,
mathematically tractable model of gene reproduction and replacement that laid
the foundation for contemporary population genetics. The Wright-Fisher model
and its extensions have given biologists powerful tools of statistical
inference that enabled the quantification of genetic drift and selection. Given
the utility of these tools, we often forget that their model - for
mathematical, and not biological reasons - makes assumptions that are violated
in most real-world populations. In this paper, I consider an alternative
framework that merges P. A. P. Moran's continuous-time Markov chain model of
allele frequency with the density dependent models of ecological competition
proposed by Gause, Lotka and Volterra, that, unlike Moran's model allow for a
stochastically varying -- but bounded -- population size. I require that allele
numbers vary according to a density-dependent population process, for which the
limiting law of large numbers is a dissipative, irreducible, competitive
dynamical system. Under the assumption that this limiting system admits a
codimension one submanifold of attractive fixed points -- a condition that
naturally generalises the weak selection regime of classical population
dynamics -- it is shown that for an appropriate rescaling of time, the finite
dimensional distributions of the original process converge to those of a
diffusion process on the submanifold. Weak convergence results are also
obtained for a related process.
|
[{'version': 'v1', 'created': 'Fri, 30 Apr 2010 20:08:22 GMT'}
{'version': 'v2', 'created': 'Thu, 19 Dec 2013 22:50:15 GMT'}]
|
2013-12-23
|
[array(['Parsons', 'Todd L.', ''], dtype=object)]
|
1,958 |
1805.11632
|
Rajarshi Pal
|
Rajarshi Pal and Arul Lakshminarayan
|
Entangling power of time-evolution operators in integrable and
nonintegrable many-body systems
|
Comments are welcome
|
Phys. Rev. B 98, 174304 (2018)
|
10.1103/PhysRevB.98.174304
| null |
quant-ph cond-mat.stat-mech cond-mat.str-el hep-th nlin.SI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The entangling power and operator entanglement entropy are state independent
measures of entanglement. Their growth and saturation is examined in the
time-evolution operator of quantum many-body systems that can range from the
integrable to the fully chaotic. An analytically solvable integrable model of
the kicked transverse field Ising chain is shown to have ballistic growth of
operator von Neumann entanglement entropy and exponentially fast saturation of
the linear entropy with time. Surprisingly a fully chaotic model with
longitudinal fields turned on shares the same growth phase, and is consistent
with a random matrix model that is also exactly solvable for the linear entropy
entanglements. However an examination of the entangling power shows that its
largest value is significantly less than the nearly maximal value attained by
the nonintegrable one. The importance of long-range spectral correlations, and
not just the nearest neighbor spacing, is pointed out in determing the growth
of entanglement in nonintegrable systems. Finally an interesting case that
displays some features peculiar to both integrable and nonintegrable systems is
briefly discussed.
|
[{'version': 'v1', 'created': 'Tue, 29 May 2018 18:02:49 GMT'}]
|
2018-11-28
|
[array(['Pal', 'Rajarshi', ''], dtype=object)
array(['Lakshminarayan', 'Arul', ''], dtype=object)]
|
1,959 |
1002.0592
|
Jason Melbourne
|
J. Melbourne (Caltech), B. Williams (U. Washington), J. Dalcanton (U.
Washington), S. M. Ammons (Arizona), C. Max (UCSC), D. C. Koo (UCSC), Leo
Girardi (INAF), A. Dolphin (Raytheon)
|
The Asymptotic Giant Branch and the Tip of the Red Giant Branch as
Probes of Star Formation History: The Nearby Dwarf Irregular Galaxy KKH 98
|
15 pages, 14 figs, accepted for publication in ApJ
| null |
10.1088/0004-637X/712/1/469
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the utility of the asymptotic giant branch (AGB) and the red
giant branch (RGB) as probes of the star formation history (SFH) of the nearby
(D=2.5 Mpc) dwarf irregular galaxy, KKH 98. Near-infrared (IR) Keck Laser Guide
Star Adaptive Optics (AO) images resolve 592 IR bright stars reaching over 1
magnitude below the Tip of the Red Giant Branch. Significantly deeper optical
(F475W and F814W) Hubble Space Telescope images of the same field contain over
2500 stars, reaching to the Red Clump and the Main Sequence turn-off for 0.5
Gyr old populations. Compared to the optical color magnitude diagram (CMD), the
near-IR CMD shows significantly tighter AGB sequences, providing a good probe
of the intermediate age (0.5 - 5 Gyr) populations. We match observed CMDs with
stellar evolution models to recover the SFH of KKH 98. On average, the galaxy
has experienced relatively constant low-level star formation (5 x 10^-4 Mo
yr^-1) for much of cosmic time. Except for the youngest main sequence
populations (age < 0.1 Gyr), which are typically fainter than the AO data flux
limit, the SFH estimated from the the 592 IR bright stars is a reasonable match
to that derived from the much larger optical data set. Differences between the
optical and IR derived SFHs for 0.1 - 1 Gyr populations suggest that current
stellar evolution models may be over-producing the AGB by as much as a factor
of three in this galaxy. At the depth of the AO data, the IR luminous stars are
not crowded. Therefore these techniques can potentially be used to determine
the stellar populations of galaxies at significantly further distances.
|
[{'version': 'v1', 'created': 'Tue, 2 Feb 2010 21:09:39 GMT'}]
|
2015-05-18
|
[array(['Melbourne', 'J.', '', 'Caltech'], dtype=object)
array(['Williams', 'B.', '', 'U. Washington'], dtype=object)
array(['Dalcanton', 'J.', '', 'U.\n Washington'], dtype=object)
array(['Ammons', 'S. M.', '', 'Arizona'], dtype=object)
array(['Max', 'C.', '', 'UCSC'], dtype=object)
array(['Koo', 'D. C.', '', 'UCSC'], dtype=object)
array(['Girardi', 'Leo', '', 'INAF'], dtype=object)
array(['Dolphin', 'A.', '', 'Raytheon'], dtype=object)]
|
1,960 |
1603.05658
|
Aldo Batta
|
Aldo Batta and Willaim H. Lee
|
Inner Engine Shutdown from Transitions in the Angular Momentum
Distribution in Collapsars
|
11 pages, 9 figures
| null |
10.1093/mnras/stw697
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For the collapsar scenario to be effective in the production of Gamma Ray
Bursts, the infalling star's angular momentum $J(r)$ must be larger than the
critical angular momentum needed to form an accretion disk around a blackhole
(BH), namely $J_{\rm crit} = 2r_{g}c$ for a Schwarzschild BH. By means of 3D
SPH simulations, here we study the collapse and accretion onto black holes of
spherical rotating envelopes, whose angular momentum distribution has
transitions between supercritical ($J>J_{\rm crit}$) and subcritical ($J<J_{\rm
crit}$) values. Contrary to results obtained in previous 2D hydrodynamical
simulations, we find that a substantial amount of subcritical material fed to
the accretion disk, lingers around long enough to contribute significantly to
the energy loss rate. Increasing the amount of angular momentum in the
subcritical material increases the time spent at the accretion disk, and only
when the bulk of this subcritical material is accreted before it is replenished
by a massive outermost supercritical shell, the inner engine experiences a
shutdown. Once the muffled accretion disk is provided again with enough
supercritical material, the shutdown will be over and a quiescent time in the
long GRB produced afterwards could be observed.
|
[{'version': 'v1', 'created': 'Thu, 17 Mar 2016 20:00:04 GMT'}]
|
2016-04-20
|
[array(['Batta', 'Aldo', ''], dtype=object)
array(['Lee', 'Willaim H.', ''], dtype=object)]
|
1,961 |
1611.05272
|
Martin Siebenborn
|
Martin Siebenborn and Kathrin Welker
|
Algorithmic aspects of multigrid methods for optimization in shape
spaces
| null | null |
10.1137/16m1104561
| null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the interaction of multigrid methods and shape optimization in
appropriate shape spaces. Our aim is a scalable algorithm for application on
supercomputers, which can only be achieved by mesh-independent convergence. The
impact of discrete approximations of geometrical quantities, like the mean
curvature, on a multigrid shape optimization algorithm with quasi-Newton
updates is investigated. For the purpose of illustration, we consider a complex
model for the identification of cellular structures in biology with minimal
compliance in terms of elasticity and diffusion equations.
|
[{'version': 'v1', 'created': 'Wed, 16 Nov 2016 13:50:36 GMT'}
{'version': 'v2', 'created': 'Fri, 18 Nov 2016 13:28:28 GMT'}
{'version': 'v3', 'created': 'Tue, 7 Nov 2017 15:09:50 GMT'}]
|
2021-04-12
|
[array(['Siebenborn', 'Martin', ''], dtype=object)
array(['Welker', 'Kathrin', ''], dtype=object)]
|
1,962 |
1501.03988
|
Ilkka T\"orm\"a
|
Ville Salo, Ilkka T\"orm\"a
|
A One-Dimensional Physically Universal Cellular Automaton
|
17 pages, 6 figures. Corrected an error in a figure
| null | null | null |
cs.FL math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Physical universality of a cellular automaton was defined by Janzing in 2010
as the ability to implement an arbitrary transformation of spatial patterns. In
2014, Schaeffer gave a construction of a two-dimensional physically universal
cellular automaton. We construct a one-dimensional version of the automaton.
|
[{'version': 'v1', 'created': 'Fri, 16 Jan 2015 14:31:18 GMT'}
{'version': 'v2', 'created': 'Mon, 19 Jan 2015 15:47:46 GMT'}]
|
2016-02-22
|
[array(['Salo', 'Ville', ''], dtype=object)
array(['Törmä', 'Ilkka', ''], dtype=object)]
|
1,963 |
2208.14055
|
Shivam Verma
|
Jagadish Rajpoot, Ravneet Paul, Shivam Verma
|
Novel STT/SHE MTJ Compact Model Compatible with NGSPICE
| null | null | null | null |
physics.app-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Ensuring high performance, while meeting the power budget is a challenging
task as the world is moving towards next-generation computing. Researchers and
designers are in search of new solutions for efficient computation. Spintronics
devices have been viewed as a promising way to deal with the escalating
difficulties of CMOS downscaling, explicitly, the Magnetic Tunnel Junction
(MTJ) devices have been the focal point of investigation. They possess some
essential features from the aforementioned perspective such as nonvolatility,
low power, and scalability. In light of the significance of MTJ devices in
next-generation computing, this paper presents a physics-based STT/SHE MTJ
model for hybrid MTJ/CMOS circuit simulation, that accurately emulates the
device physics and stochastic thermal noise behavior of the MTJ. It is vital to
have an MTJ compact model which is compatible with the open-source NGSPICE
simulation framework since previously developed models are reliant on
commercial EDA tools. In addition, for developing hybrid circuits with random
process fluctuations, a simulator-independent Monte-Carlo simulation capability
has been incorporated Finally, the STT/SHE-MTJ model is demonstrated using PCSA
read/write operation and the implementation of neuron MTJ.
|
[{'version': 'v1', 'created': 'Tue, 30 Aug 2022 08:13:13 GMT'}]
|
2022-08-31
|
[array(['Rajpoot', 'Jagadish', ''], dtype=object)
array(['Paul', 'Ravneet', ''], dtype=object)
array(['Verma', 'Shivam', ''], dtype=object)]
|
1,964 |
2202.04510
|
Navin Singh Dr
|
Neha Mathur, Amar Singh, and Navin Singh
|
The crowding effect on the melting of short DNA: Comparison with
experiments
| null | null | null | null |
cond-mat.soft
|
http://creativecommons.org/licenses/by/4.0/
|
We study the effect of crowders on the melting profile of homogeneous and
heterogeneous DNA molecules. We find out the melting profile of short DNA
molecules and compare our findings with the experiments. We consider some
random distribution of crowders along the chain, and by finding out the best
match with the experiments, we attempt to identify the location of crowders in
the experimental findings of Ghosh \cite{Ghosh_PNAS_2020}. We also study the
melting of homogeneous DNA molecules of different lengths (25, 50, 75) in the
presence of only one crowder in the chain. By varying the location of the
crowder from one end to the other, we find that the melting temperature is
susceptible to the location of the crowder at the ends. At the same time, there
is minimal effect on the melting temperature due to the location of the
crowder. {\it In vivo}, the strength of a crowders may vary along the chain. We
study the melting of long heterogeneous chain in presence of five crowders of
different strength. We find that there is a significant variation in the
melting process of DNA in presence of crowders of variable strength.
|
[{'version': 'v1', 'created': 'Wed, 9 Feb 2022 15:16:04 GMT'}]
|
2022-02-10
|
[array(['Mathur', 'Neha', ''], dtype=object)
array(['Singh', 'Amar', ''], dtype=object)
array(['Singh', 'Navin', ''], dtype=object)]
|
1,965 |
0910.3988
|
Xiao-Gang Wen
|
Yuan-Ming Lu, Xiao-Gang Wen, Zhenghan Wang, Ziqiang Wang
|
Non-Abelian Quantum Hall States and their Quasiparticles: from the
Pattern of Zeros to Vertex Algebra
|
42 pages. RevTeX4
|
Phys. Rev. B 81, 115124 (2010)
|
10.1103/PhysRevB.81.115124
| null |
cond-mat.str-el cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the pattern-of-zeros approach to quantum Hall states, a set of data
{n;m;S_a|a=1,...,n; n,m,S_a in N} (called the pattern of zeros) is introduced
to characterize a quantum Hall wave function. In this paper we find sufficient
conditions on the pattern of zeros so that the data correspond to a valid wave
function. Some times, a set of data {n;m;S_a} corresponds to a unique quantum
Hall state, while other times, a set of data corresponds to several different
quantum Hall states. So in the latter cases, the patterns of zeros alone does
not completely characterize the quantum Hall states. In this paper, We find
that the following expanded set of data {n;m;S_a;c|a=1,...,n; n,m,S_a in N; c
in R} provides a more complete characterization of quantum Hall states. Each
expanded set of data completely characterize a unique quantum Hall state, at
least for the examples discussed in this paper. The result is obtained by
combining the pattern of zeros and Z_n simple-current vertex algebra which
describes a large class of Abelian and non-Abelian quantum Hall states
\Phi_{Z_n}^sc. The more complete characterization in terms of {n;m;S_a;c}
allows us to obtain more topological properties of those states, which include
the central charge c of edge states, the scaling dimensions and the statistics
of quasiparticle excitations.
|
[{'version': 'v1', 'created': 'Wed, 21 Oct 2009 02:19:24 GMT'}
{'version': 'v2', 'created': 'Sun, 25 Oct 2009 23:59:13 GMT'}]
|
2013-05-29
|
[array(['Lu', 'Yuan-Ming', ''], dtype=object)
array(['Wen', 'Xiao-Gang', ''], dtype=object)
array(['Wang', 'Zhenghan', ''], dtype=object)
array(['Wang', 'Ziqiang', ''], dtype=object)]
|
1,966 |
2210.07682
|
Louis Veyrat
|
Teresa Tschirner, Berengar Leikert, Felix Kern, Daniel Wolf, Axel
Lubk, Martin Kamp, Kirill Miller, Fabian Hartmann, Sven H\"ofling, Bernd
B\"uchner, Joseph Dufouleur, Marc Gabay, Michael Sing, Ralph Claessen, Louis
Veyrat
|
Linear colossal magnetoresistance driven by magnetic textures in LaTiO3
thin films on SrTiO3
| null | null | null | null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Linear magnetoresistance (LMR) is of particular interest for memory,
electronics, and sensing applications, especially when it does not saturate
over a wide range of magnetic fields. One of its principal origins is local
mobility or density inhomogeneities, often structural, which in the
Parish-Littlewood theory leads to an unsaturating LMR proportional to mobility.
Structural disorder, however, also tends to limit the mobility and hence the
overall LMR amplitude. An alternative route to achieve large LMR is via
non-structural inhomogeneities which do not affect the zero field mobility,
like magnetic domains. Here, linear positive magnetoresistance caused by
magnetic texture is reported in \ch{LaTiO3}/\ch{SrTiO3} heterostructures. The
LMR amplitude reaches up to 6500\% at 9T. This colossal value is understood by
the unusual combination of a very high thin film mobility, up to 40 000
cm$^2$/V.s, and a very large coverage of low-mobility regions. These regions
correlate with a striped magnetic structure, compatible with a spiral magnetic
texture in the \ch{LaTiO3} film, revealed by low temperature Lorentz
transmission electron microscopy. These results provide a novel route for the
engineering of large-LMR devices.
|
[{'version': 'v1', 'created': 'Fri, 14 Oct 2022 10:09:31 GMT'}]
|
2022-10-17
|
[array(['Tschirner', 'Teresa', ''], dtype=object)
array(['Leikert', 'Berengar', ''], dtype=object)
array(['Kern', 'Felix', ''], dtype=object)
array(['Wolf', 'Daniel', ''], dtype=object)
array(['Lubk', 'Axel', ''], dtype=object)
array(['Kamp', 'Martin', ''], dtype=object)
array(['Miller', 'Kirill', ''], dtype=object)
array(['Hartmann', 'Fabian', ''], dtype=object)
array(['Höfling', 'Sven', ''], dtype=object)
array(['Büchner', 'Bernd', ''], dtype=object)
array(['Dufouleur', 'Joseph', ''], dtype=object)
array(['Gabay', 'Marc', ''], dtype=object)
array(['Sing', 'Michael', ''], dtype=object)
array(['Claessen', 'Ralph', ''], dtype=object)
array(['Veyrat', 'Louis', ''], dtype=object)]
|
1,967 |
nucl-th/9712039
|
Jiri Mares
|
S. Marcos (1), R.J. Lombard (2), J. Mares (3) ((1) Univ. of Cantabria,
(2) IPN Orsay, (3) INP Rez/Prague)
|
On the binding energy of double \Lambda hypernuclei in the relativistic
mean field theory
|
15 pages, RevTeX, 2 Postscript figures, submitted Phys. Rev. C
|
Phys.Rev.C57:1178-1183,1998
|
10.1103/PhysRevC.57.1178
| null |
nucl-th
| null |
We calculate the binding energy of two $\Lambda$ hyperons bound to a nuclear
core within the relativistic mean field theory. The starting point is a
two-body relativistic equation of the Breit type suggested by the RMFT, and
corrected for the two-particle interaction. We evaluate the 2 $\Lambda$
correlation energy and estimate the contribution of the $\sigma^*$ and $\Phi$
mesons, acting solely between hyperons, to the bond energy
$\Delta{B_{\Lambda\Lambda}}$ of $^6_{\Lambda\Lambda}He$,
$^{10}_{\Lambda\Lambda}Be$ and $^{13}_{\Lambda\Lambda}B$. Predictions of the
$\Delta{B_{\Lambda\Lambda}}$ A dependence are made for heavier
$\Lambda$-hypernuclei.
|
[{'version': 'v1', 'created': 'Thu, 11 Dec 1997 10:28:24 GMT'}]
|
2016-09-08
|
[array(['Marcos', 'S.', ''], dtype=object)
array(['Lombard', 'R. J.', ''], dtype=object)
array(['Mares', 'J.', ''], dtype=object)]
|
1,968 |
cond-mat/0001238
|
Yoshio Kuramoto
|
Yoshio Kuramoto and Hiroaki Kusunose
|
Octupole Moment as a Hidden Order Parameter in Orbitally Degenerate
f-Electron Systems
|
4 pages, 1 figure, to be published in J.Phys.Soc.Jpn
| null |
10.1143/JPSJ.69.671
| null |
cond-mat.str-el
| null |
Possibility of a novel pseudo-scalar (octupole) order is studied
theoretically for orbitally degenerate systems with strong spin-orbit coupling
such as Ce$_x$La$_{1-x}$B$_6$. It is discussed that coexistence of an octupole
order parameter and antiferromagnetic fluctuation should lead to drastic
softening of the elastic constant by a mode-mixing effect. Nonlinear coupling
between dipole, quadrupole and octupole fluctuations is taken into account in
terms of a Ginzburg-Landau-type functional which is derived microscopically
through path integral.
|
[{'version': 'v1', 'created': 'Tue, 18 Jan 2000 09:42:36 GMT'}]
|
2009-10-31
|
[array(['Kuramoto', 'Yoshio', ''], dtype=object)
array(['Kusunose', 'Hiroaki', ''], dtype=object)]
|
1,969 |
2206.07006
|
Jaap Storm
|
Jaap Storm and Wouter Kager and Michel Mandjes and Sem Borst
|
Stability of a Stochastic Ring Network
| null | null | null | null |
math.PR
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper we establish a necessary and sufficient stability condition for
a stochastic ring network. Such networks naturally appear in a variety of
applications within communication, computer, and road traffic systems. They
typically involve multiple customer types and some form of priority structure
to decide which customer receives service. These two system features tend to
complicate the issue of identifying a stability condition, but we demonstrate
how the ring topology can be leveraged to solve the problem.
|
[{'version': 'v1', 'created': 'Tue, 14 Jun 2022 17:17:31 GMT'}]
|
2022-06-15
|
[array(['Storm', 'Jaap', ''], dtype=object)
array(['Kager', 'Wouter', ''], dtype=object)
array(['Mandjes', 'Michel', ''], dtype=object)
array(['Borst', 'Sem', ''], dtype=object)]
|
1,970 |
cond-mat/0005065
|
Zhengfan
|
M. J. Black and V. Chandrasekhar
|
Influence of temperature dependent inelastic scattering on the
superconducting proximity effect
| null | null |
10.1209/epl/i2000-00263-9
| null |
cond-mat.mes-hall
| null |
We have measured the differential resistance of mesoscopic gold wires of
different lengths connected to an aluminum superconductor as a function of
temperature and voltage. Our experimental results differ substantially from
theoretical predictions which assume an infinite temperature independent gap in
the superconductor. In addition to taking into account the temperature
dependence of the gap, we must also introduce a temperature dependent inelastic
scattering length in order to fit our data.
|
[{'version': 'v1', 'created': 'Wed, 3 May 2000 03:54:23 GMT'}]
|
2009-10-31
|
[array(['Black', 'M. J.', ''], dtype=object)
array(['Chandrasekhar', 'V.', ''], dtype=object)]
|
1,971 |
2205.10949
|
Kanav Vats
|
Kanav Vats, Mehrnaz Fani, David A. Clausi, John S. Zelek
|
Evaluating deep tracking models for player tracking in broadcast ice
hockey video
|
Accepted to Link\"oping Hockey Analytics Conference (LINHAC). arXiv
admin note: substantial text overlap with arXiv:2110.03090
| null | null | null |
cs.CV
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Tracking and identifying players is an important problem in computer vision
based ice hockey analytics. Player tracking is a challenging problem since the
motion of players in hockey is fast-paced and non-linear. There is also
significant player-player and player-board occlusion, camera panning and
zooming in hockey broadcast video. Prior published research perform player
tracking with the help of handcrafted features for player detection and
re-identification. Although commercial solutions for hockey player tracking
exist, to the best of our knowledge, no network architectures used, training
data or performance metrics are publicly reported. There is currently no
published work for hockey player tracking making use of the recent advancements
in deep learning while also reporting the current accuracy metrics used in
literature. Therefore, in this paper, we compare and contrast several
state-of-the-art tracking algorithms and analyze their performance and failure
modes in ice hockey.
|
[{'version': 'v1', 'created': 'Sun, 22 May 2022 22:56:31 GMT'}]
|
2022-05-24
|
[array(['Vats', 'Kanav', ''], dtype=object)
array(['Fani', 'Mehrnaz', ''], dtype=object)
array(['Clausi', 'David A.', ''], dtype=object)
array(['Zelek', 'John S.', ''], dtype=object)]
|
1,972 |
hep-th/9610044
|
Prem Prakash Srivastava
|
Prem P. Srivastava (Inst. Fisica, UERJ-Univ. do Estado de Rio de
Janeiro, Rio de Janeiro, Brasil)
|
Light-Front Quantization of Field Theory
|
18 pages, Tex, published in ``Lightfront quantization of field
theory'' in ``Topics in Theoretical Physics'', ``Festschrift for Paulo Leal
Ferreira'', eds. V.C. Aguilera-Navarro et. al., pgs. 206-217, IFT-SP, Sao
Paulo, Brasil, 1995
| null | null |
CBPF-NF-045/96; IF-UERJ 033/96
|
hep-th hep-ph
| null |
Some basic topics in Light-Front (LF) quantized field theory are reviewed.
Poincar\`e algebra and the LF Spin operator are discussed. The local scalar
field theory of the conventional framework is shown to correspond to a
non-local Hamiltonian theory on the LF in view of the constraint equations on
the phase space, which relate the bosonic condensates to the non-zero modes.
This new ingredient is useful to describe the spontaneous symmetry breaking on
the LF. The instability of the symmetric phase in two dimensional scalar theory
when the coupling constant grows is shown in the LF theory renormalized to one
loop order. Chern-Simons gauge theory, regarded to describe excitations with
fractional statistics, is quantized in the light-cone gauge and a simple LF
Hamiltonian obtained which may allow us to construct renormalized theory of
anyons.
|
[{'version': 'v1', 'created': 'Mon, 7 Oct 1996 22:37:43 GMT'}]
|
2007-05-23
|
[array(['Srivastava', 'Prem P.', '',
'Inst. Fisica, UERJ-Univ. do Estado de Rio de\n Janeiro, Rio de Janeiro, Brasil'],
dtype=object) ]
|
1,973 |
1910.00469
|
Ilkka M\"akinen
|
Ilkka M\"akinen
|
Dynamics in canonical models of loop quantum gravity
|
PhD thesis. Faculty of Physics, University of Warsaw. 215 pages. A
few minor corrections have been made relative to the refereed version of the
work, which can be found at https://depotuw.ceon.pl/handle/item/3489. v2:
More typos corrected. v3: Yet more typos fixed, and a couple of slight
inaccuracies corrected in the presentation of the introductory material
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this thesis we consider the problem of dynamics in canonical loop quantum
gravity, primarily in the context of deparametrized models, in which a scalar
field is taken as a physical time variable for the dynamics of the
gravitational field. The dynamics of the quantum states of the gravitational
field is then generated directly by a physical Hamiltonian operator, instead of
being implicitly defined through the kernel of a Hamiltonian constraint.
We introduce a new construction of a Hamiltonian operator for loop quantum
gravity, which has both mathematical and practical advantages in comparison to
earlier proposals. Most importantly, the new Hamiltonian can be constructed as
a symmetric operator, and is therefore a mathematically consistent candidate
for a generator of physical time evolution in deparametrized models. We develop
methods for approximately evaluating the dynamics generated by a given physical
Hamiltonian, even if an exact solution to the eigenvalue problem of the
Hamiltonian cannot be achieved. We also introduce a new representation for
intertwiners in loop quantum gravity, based on projecting intertwiners onto
coherent states of angular momentum, and in which intertwiners are represented
as polynomials of certain complex variables, and operators in loop quantum
gravity are expressed as differential operators acting on these variables.
In addition to reviewing the results of the author's scientific work, this
thesis also gives a thorough introduction to the basic framework of canonical
loop quantum gravity, and a self-contained presentation of the graphical
formalism for SU(2) recoupling theory, which is the invaluable tool for
performing practical calculations in loop quantum gravity. The author therefore
hopes that parts of this thesis could serve as a comprehensible source of
information for anyone interested in learning the elements of loop quantum
gravity.
|
[{'version': 'v1', 'created': 'Tue, 1 Oct 2019 15:05:29 GMT'}
{'version': 'v2', 'created': 'Thu, 31 Oct 2019 16:18:50 GMT'}
{'version': 'v3', 'created': 'Wed, 30 Dec 2020 11:37:38 GMT'}]
|
2021-01-01
|
[array(['Mäkinen', 'Ilkka', ''], dtype=object)]
|
1,974 |
2202.03442
|
Massimo Porrati
|
Reza Javadinezhad, Uri Kol and Massimo Porrati
|
Supertranslation-Invariant Dressed Lorentz Charges
|
Typos in eq. (57) and (67) of version 1 --now (56) and (66),
respectively-- have been corrected; references have been added. To appear in
JHEP
| null |
10.1007/JHEP04(2022)069
| null |
hep-th gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
We present an explicit formula for Lorentz boosts and rotations that commute
with BMS supertranslations in asymptotically flat spacetimes. Key to the
construction is the use of infrared regularizations and of a unitary
transformation that makes observables commute with the soft degrees of freedom.
We explicitly verify that our charges satisfy the Lorentz algebra and we check
that they are consistent with expectations by evaluating them on the
supertranslated Minkowski space and on the boosted Kerr black hole.
|
[{'version': 'v1', 'created': 'Mon, 7 Feb 2022 19:00:01 GMT'}
{'version': 'v2', 'created': 'Tue, 12 Apr 2022 03:29:41 GMT'}]
|
2022-04-27
|
[array(['Javadinezhad', 'Reza', ''], dtype=object)
array(['Kol', 'Uri', ''], dtype=object)
array(['Porrati', 'Massimo', ''], dtype=object)]
|
1,975 |
1901.03350
|
Miguel Angel Alejo Plana
|
Miguel A. Alejo and Chulkwang Kwak
|
Global solutions and stability properties of the 5th order Gardner
equation
|
34 pages, typos corrected, references updated, title of the latter
version changed
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we deal with the initial value problem of the 5th-order Gardner
equation in $\mathbb{R}$, presenting the local well-posedness result in
$H^2(\mathbb{R})$. As a consequence of the local result, in addition to
$H^2$-energy conservation law, we are able to prove the global well-posedness
result in $H^2(\mathbb{R})$. Finally, we present a stability result for 5th
order Gardner breather solution in the Sobolev space $H^2(\mathbb{R})$.
|
[{'version': 'v1', 'created': 'Thu, 10 Jan 2019 19:19:45 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Jan 2019 21:00:19 GMT'}]
|
2019-01-16
|
[array(['Alejo', 'Miguel A.', ''], dtype=object)
array(['Kwak', 'Chulkwang', ''], dtype=object)]
|
1,976 |
1904.04575
|
Shu Wang
|
Shu Wang and Xiaodian Chen
|
The Optical to Mid-Infrared Extinction Law Based on the APOGEE, Gaia
DR2, Pan-STARRS1, SDSS, APASS, 2MASS and WISE Surveys
|
22 pages, 10 figures, 5 tables, publication in the Astrophysical
Journal
| null |
10.3847/1538-4357/ab1c61
| null |
astro-ph.GA astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A precise interstellar dust extinction law is critically important to
interpret observations. There are two indicators of extinction: the color
excess ratio (CER) and the relative extinction. Compared to the CER, the
wavelength-dependent relative extinction is more challenging to be determined.
In this work, we combine spectroscopic, astrometric, and photometric data to
derive high-precision CERs and relative extinction from optical to mid-infrared
(IR) bands. A group of 61,111 red clump (RC) stars are selected as tracers by
stellar parameters from APOGEE survey. The multiband photometric data are
collected from Gaia, APASS, SDSS, Pan-STARRS1, 2MASS, and WISE surveys. For the
first time, we calibrate the curvature of CERs in determining CERs
E(lambda-GRP)/E(GBP-GRP) from color excess--color excess diagrams. Through
elaborate uncertainty analysis, we conclude that the precision of our CERs is
significantly improved (sigma < 0.015). With parallaxes from Gaia DR2, we
calculate the relative extinction A_GBP/A_GRP for 5051 RC stars. By combining
the CERs with the A_GBP/A_GRP, the optical--mid-IR extinction A_lambda/A_GRP
has been determined in a total of 21 bands. Given no bias toward any specific
environment, our extinction law represents the average extinction law with the
total-to-selective extinction ratio Rv=3.16+-0.15. Our observed extinction law
supports an adjustment in parameters of the CCM Rv=3.1 curve, together with the
near-IR power-law index alpha=2.07+-0.03. The relative extinction values of HST
and JWST near-IR bandpasses are predicted in 2.5% precision. As the observed
reddening/extinction tracks are curved, the curvature correction needs to be
considered when applying extinction correction.
|
[{'version': 'v1', 'created': 'Tue, 9 Apr 2019 10:12:35 GMT'}
{'version': 'v2', 'created': 'Wed, 24 Apr 2019 08:26:56 GMT'}
{'version': 'v3', 'created': 'Mon, 15 Jul 2019 09:09:59 GMT'}]
|
2019-07-16
|
[array(['Wang', 'Shu', ''], dtype=object)
array(['Chen', 'Xiaodian', ''], dtype=object)]
|
1,977 |
1812.03565
|
Stephen Tu
|
Stephen Tu and Benjamin Recht
|
The Gap Between Model-Based and Model-Free Methods on the Linear
Quadratic Regulator: An Asymptotic Viewpoint
|
Improved the main result regarding policy optimization
| null | null | null |
cs.LG math.OC stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effectiveness of model-based versus model-free methods is a long-standing
question in reinforcement learning (RL). Motivated by recent empirical success
of RL on continuous control tasks, we study the sample complexity of popular
model-based and model-free algorithms on the Linear Quadratic Regulator (LQR).
We show that for policy evaluation, a simple model-based plugin method requires
asymptotically less samples than the classical least-squares temporal
difference (LSTD) estimator to reach the same quality of solution; the sample
complexity gap between the two methods can be at least a factor of state
dimension. For policy evaluation, we study a simple family of problem instances
and show that nominal (certainty equivalence principle) control also requires
several factors of state and input dimension fewer samples than the policy
gradient method to reach the same level of control performance on these
instances. Furthermore, the gap persists even when employing commonly used
baselines. To the best of our knowledge, this is the first theoretical result
which demonstrates a separation in the sample complexity between model-based
and model-free methods on a continuous control task.
|
[{'version': 'v1', 'created': 'Sun, 9 Dec 2018 22:24:26 GMT'}
{'version': 'v2', 'created': 'Sun, 3 Feb 2019 20:55:30 GMT'}]
|
2019-02-05
|
[array(['Tu', 'Stephen', ''], dtype=object)
array(['Recht', 'Benjamin', ''], dtype=object)]
|
1,978 |
1909.11855
|
Dai Quoc Nguyen
|
Dai Quoc Nguyen and Tu Dinh Nguyen and Dinh Phung
|
Universal Graph Transformer Self-Attention Networks
|
Accepted to The ACM Web Conference 2022 (WWW '22) (Poster and Demo
Track)
| null | null | null |
cs.LG cs.CV stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a transformer-based GNN model, named UGformer, to learn graph
representations. In particular, we present two UGformer variants, wherein the
first variant (publicized in September 2019) is to leverage the transformer on
a set of sampled neighbors for each input node, while the second (publicized in
May 2021) is to leverage the transformer on all input nodes. Experimental
results demonstrate that the first UGformer variant achieves state-of-the-art
accuracies on benchmark datasets for graph classification in both inductive
setting and unsupervised transductive setting; and the second UGformer variant
obtains state-of-the-art accuracies for inductive text classification. The code
is available at: \url{https://github.com/daiquocnguyen/Graph-Transformer}.
|
[{'version': 'v1', 'created': 'Thu, 26 Sep 2019 02:39:59 GMT'}
{'version': 'v10', 'created': 'Fri, 13 Aug 2021 07:03:12 GMT'}
{'version': 'v11', 'created': 'Tue, 14 Sep 2021 14:04:22 GMT'}
{'version': 'v12', 'created': 'Thu, 7 Oct 2021 05:29:30 GMT'}
{'version': 'v13', 'created': 'Tue, 8 Mar 2022 12:19:56 GMT'}
{'version': 'v2', 'created': 'Tue, 12 Nov 2019 13:27:35 GMT'}
{'version': 'v3', 'created': 'Fri, 6 Dec 2019 16:47:35 GMT'}
{'version': 'v4', 'created': 'Sat, 29 Feb 2020 02:05:59 GMT'}
{'version': 'v5', 'created': 'Wed, 8 Apr 2020 15:15:35 GMT'}
{'version': 'v6', 'created': 'Thu, 16 Apr 2020 14:46:21 GMT'}
{'version': 'v7', 'created': 'Mon, 29 Jun 2020 10:15:50 GMT'}
{'version': 'v8', 'created': 'Mon, 3 Aug 2020 15:13:44 GMT'}
{'version': 'v9', 'created': 'Fri, 23 Oct 2020 17:39:40 GMT'}]
|
2022-03-09
|
[array(['Nguyen', 'Dai Quoc', ''], dtype=object)
array(['Nguyen', 'Tu Dinh', ''], dtype=object)
array(['Phung', 'Dinh', ''], dtype=object)]
|
1,979 |
2008.03015
|
Hideaki Takahashi
|
Hideaki Takahashi
|
A Paradigm for Density Functional Theory Using Electron Distribution on
the Energy Coordinate
| null | null | null | null |
physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Static correlation error(SCE) inevitably emerges when a dissociation of a
covalent bond is described with a conventional denstiy-functional theory (DFT)
for electrons. SCE gives rise to a serious overshoot in the potential energy at
the dissociation limit even in the simplest molecules. The error is attributed
to the basic framework of the approximate functional for the exchange
correlation energy Exc which refers only to local properties at coordinate r,
namely, the electron density n(r) and its derivatives. To solve the problem we
developed a functional Ee which uses xc the energy electron distribution ne(e)
as a fundamental variable in DFT. ne(e) is obtained by the projection of the
density n(r) onto an energy coordinate e defined with the external potential of
interest. The functional was applied to the dissociations of single, double,
and triple bonds in small molecules showing reasonable agreements with the
results given by a high level molecular orbitals theory. We also applied the
functional to the computation of the energy change associated with spin
depolarization and symmetrization in Carbon atom, which made an improvement
over the conventional functional. This work opens the way for development of
tougher functional that necessitates non-local properties of electrons such as
kinetic energy functional.
|
[{'version': 'v1', 'created': 'Fri, 7 Aug 2020 07:03:49 GMT'}]
|
2020-08-10
|
[array(['Takahashi', 'Hideaki', ''], dtype=object)]
|
1,980 |
2306.04655
|
Muhammad Waqas
|
Muhammad Waqas, Muhammad Ashraf, Muhammad Zakwan
|
Modulation Classification Through Deep Learning Using Resolution
Transformed Spectrograms
|
15 pages, 12 figures
| null | null | null |
eess.SP cs.LG cs.SD eess.AS
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Modulation classification is an essential step of signal processing and has
been regularly applied in the field of tele-communication. Since variations of
frequency with respect to time remains a vital distinction among radio signals
having different modulation formats, these variations can be used for feature
extraction by converting 1-D radio signals into frequency domain. In this
paper, we propose a scheme for Automatic Modulation Classification (AMC) using
modern architectures of Convolutional Neural Networks (CNN), through generating
spectrum images of eleven different modulation types. Additionally, we perform
resolution transformation of spectrograms that results up to 99.61% of
computational load reduction and 8x faster conversion from the received I/Q
data. This proposed AMC is implemented on CPU and GPU, to recognize digital as
well as analogue signal modulation schemes on signals. The performance is
evaluated on existing CNN models including SqueezeNet, Resnet-50,
InceptionResnet-V2, Inception-V3, VGG-16 and Densenet-201. Best results of
91.2% are achieved in presence of AWGN and other noise impairments in the
signals, stating that the transformed spectrogram-based AMC has good
classification accuracy as the spectral features are highly discriminant, and
CNN based models have capability to extract these high-dimensional features.
The spectrograms were created under different SNRs ranging from 5 to 30db with
a step size of 5db to observe the experimental results at various SNR levels.
The proposed methodology is efficient to be applied in wireless communication
networks for real-time applications.
|
[{'version': 'v1', 'created': 'Tue, 6 Jun 2023 16:14:15 GMT'}]
|
2023-06-09
|
[array(['Waqas', 'Muhammad', ''], dtype=object)
array(['Ashraf', 'Muhammad', ''], dtype=object)
array(['Zakwan', 'Muhammad', ''], dtype=object)]
|
1,981 |
0812.0992
|
Giuseppe Policastro
|
Giuseppe Policastro
|
Supersymmetric hydrodynamics from the AdS/CFT correspondence
|
17 pages
|
JHEP 0902:034,2009
|
10.1088/1126-6708/2009/02/034
|
LPTENS-08/60
|
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute holographically the dispersion relation for a hydrodynamic mode of
fluctuation (the phonino) of the density of supersymmetry current in N = 4 SYM
at strong coupling. The mode appears as a pole at low frequency and momentum in
the correlator of supercurrents. It has a wave-like propagation, and we find
its speed and coefficient of attenuation.
|
[{'version': 'v1', 'created': 'Thu, 4 Dec 2008 17:43:15 GMT'}]
|
2009-02-18
|
[array(['Policastro', 'Giuseppe', ''], dtype=object)]
|
1,982 |
2212.11914
|
Fedor Popov
|
Z. Sun, F.K. Popov, I.R. Klebanov, K. Pakrouski
|
Majorana Scars as Group Singlets
|
18 pages, 1 table, 10 figures; v2: changed parameters to improve
presentation, added several new results including a bound on entropy for
group-invariant scars
| null | null | null |
cond-mat.str-el hep-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In some quantum many-body systems, the Hilbert space breaks up into a large
ergodic sector and a much smaller scar subspace. It has been suggested
[arXiv:2007.00845] that the two sectors may be distinguished by their
transformation properties under a large group whose rank grows with the system
size (it is not a symmetry of the Hamiltonian). The quantum many-body scars are
invariant under this group, while all other states are not. Here we apply this
idea to lattice systems containing $M$ Majorana fermions per site. The Hilbert
space for $N$ sites may be decomposed under the action of the
O$(N)\times$O$(M)$ group, and the scars are the SO$(N)$ singlets. For any even
$M$ there are two families of scars. One of them, which we call the $\eta$
states, is symmetric under the group O$(N)$. The other, the $\zeta$ states, has
the SO$(N)$ invariance. For $M=4$, where our construction reduces to spin-$1/2$
fermions on a lattice with local interactions, the former family are the $N+1$
$\eta$-pairing states, while the latter are the $N+1$ states of maximum spin.
We generalize this construction to $M>4$. For $M=6$ we exhibit explicit
formulae for the scar states and use them to calculate the bipartite
entanglement entropy analytically. For large $N$, it grows logarithmically with
the sub-system size. We present a general argument that any group-invariant
scars should have the entanglement entropy that is parametrically smaller than
that of typical states. The energies of the scars we find are not equidistant
in general but can be made so by choosing Hamiltonian parameters. For $M>6$ we
find that with local Hamiltonians the scars typically have certain
degeneracies. The scar spectrum can be made ergodic by adding a non-local
interaction term. We derive the dimension of each scar family and show the
scars could have a large contribution to the density of states for small $N$.
|
[{'version': 'v1', 'created': 'Thu, 22 Dec 2022 17:55:22 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Apr 2023 15:29:56 GMT'}]
|
2023-04-19
|
[array(['Sun', 'Z.', ''], dtype=object)
array(['Popov', 'F. K.', ''], dtype=object)
array(['Klebanov', 'I. R.', ''], dtype=object)
array(['Pakrouski', 'K.', ''], dtype=object)]
|
1,983 |
1207.3886
|
Michael Delmo
|
Michael P. Delmo, Eiji Shikoh, Teruya Shinjo, and Masashi Shiraishi
|
Bipolar-Driven Large Magnetoresistance in Silicon
|
23 pages, 4 figures (main text), 6 figures (supplemental material)
| null |
10.1103/PhysRevB.87.245301
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Large linear magnetoresistance (MR) in electron-injected p-type silicon at
very low magnetic field is observed experimentally at room temperature. The
large linear MR is induced in electron-dominated space-charge transport regime,
where the magnetic field modulation of electron-to-hole density ratio controls
the MR, as indicated by the magnetic field dependence of Hall coefficient in
the silicon device. Contrary to the space-charge-induced MR effect in unipolar
silicon device, where the large linear MR is inhomogeneity-induced, our results
provide a different insight into the mechanism of large linear MR in
non-magnetic semiconductors that is not based on the inhomogeneity model. This
approach enables homogeneous semiconductors to exhibit large linear MR at low
magnetic fields that until now has only been appearing in semiconductors with
strong inhomogeneities.
|
[{'version': 'v1', 'created': 'Tue, 17 Jul 2012 06:00:03 GMT'}
{'version': 'v2', 'created': 'Tue, 30 Apr 2013 04:55:23 GMT'}]
|
2013-06-05
|
[array(['Delmo', 'Michael P.', ''], dtype=object)
array(['Shikoh', 'Eiji', ''], dtype=object)
array(['Shinjo', 'Teruya', ''], dtype=object)
array(['Shiraishi', 'Masashi', ''], dtype=object)]
|
1,984 |
astro-ph/0612635
|
Ian McHardy
|
Ian McHardy, Anthony Lawson, Andrew Newsam, Alan Marscher, Andrei
Sokolov, Megan Urry, Ann Wehrle
|
Simultaneous X-ray and infrared variability in the quasar 3C273 II:
Confirmation of the correlation and X-ray lag
|
7 pages in total, including 5 figures. Accepted for publication in
Monthly Notices of the Royal Astronomical Society
|
Mon.Not.Roy.Astron.Soc.375:1521-1527,2007
|
10.1111/j.1365-2966.2006.11420.x
| null |
astro-ph
| null |
The X-ray emission from quasars such as 3C273 is generally agreed to arise
from Compton scattering of low energy seed photons by relativistic electrons in
a relativistic jet oriented close to the line of sight. However there are a
number of possible models for the origin of the seed photons. In Paper I
(McHardy et al 1999) we showed that the X-ray and IR variability from 3C273 was
highly correlated in 1997, with the IR flux leading the X-rays by ~0.75 +/-
0.25 days. The strong correlation, and lag, supports the Synchrotron
Self-Compton (SSC) model, where the seed photons are synchroton photons from
the jet itself. The previous correlation was based on one moderately well
sampled flare and another poorly sampled flare, so the possibility of chance
correlated variability exists. Here we report on further X-ray and IR
observations of 3C273 which confirm the behaviour seen in Paper I. During a 2
week period of observations we see a flare of amplitude ~25%, lasting for ~5
days, showing a high correlation between IR and X-ray variations, with the
X-rays lagging by ~1.45+/- 0.15 days. These observations were not scheduled at
any special time, implying that the same mechanism - almost certainly SSC -
dominates the X-ray emission on most occasions and that the structure of the
emission region is similar in most small flares.
|
[{'version': 'v1', 'created': 'Thu, 21 Dec 2006 12:43:45 GMT'}]
|
2008-11-26
|
[array(['McHardy', 'Ian', ''], dtype=object)
array(['Lawson', 'Anthony', ''], dtype=object)
array(['Newsam', 'Andrew', ''], dtype=object)
array(['Marscher', 'Alan', ''], dtype=object)
array(['Sokolov', 'Andrei', ''], dtype=object)
array(['Urry', 'Megan', ''], dtype=object)
array(['Wehrle', 'Ann', ''], dtype=object)]
|
1,985 |
hep-th/9209027
| null |
P.F.Bedaque, I.Horvath, S.G.Rajeev
|
Two dimensional baryons in the large N limit
|
14 pages including figures
|
Mod.Phys.Lett.A7:3347-3356,1992
|
10.1142/S0217732392002731
| null |
hep-th
| null |
We propose a bilocal field theory for mesons in two dimensions obtained as a
kind of non local bosonization of two dimensional QCD. Its semi-classical
expansion is equivalent to the $1/N_c$ expansion of QCD. Using an ansatz we
reduce the classical equation of motion of this theory in the baryon number one
sector to a relativistic Hartree equation and solve it numerically. This (non
topological) soliton is identified with the baryon.
|
[{'version': 'v1', 'created': 'Tue, 8 Sep 1992 17:56:00 GMT'}]
|
2019-08-17
|
[array(['Bedaque', 'P. F.', ''], dtype=object)
array(['Horvath', 'I.', ''], dtype=object)
array(['Rajeev', 'S. G.', ''], dtype=object)]
|
1,986 |
1212.6952
|
Nihar Shah
|
Nihar B. Shah
|
On Minimizing Data-read and Download for Storage-Node Recovery
|
IEEE Communications Letters
| null |
10.1109/LCOMM.2013.040213.130006
| null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the problem of efficient recovery of the data stored in any
individual node of a distributed storage system, from the rest of the nodes.
Applications include handling failures and degraded reads. We measure
efficiency in terms of the amount of data-read and the download required. To
minimize the download, we focus on the minimum bandwidth setting of the
'regenerating codes' model for distributed storage. Under this model, the
system has a total of n nodes, and the data stored in any node must be
(efficiently) recoverable from any d of the other (n-1) nodes. Lower bounds on
the two metrics under this model were derived previously; it has also been
shown that these bounds are achievable for the amount of data-read and download
when d=n-1, and for the amount of download alone when d<n-1.
In this paper, we complete this picture by proving the converse result, that
when d<n-1, these lower bounds are strictly loose with respect to the amount of
read required. The proof is information-theoretic, and hence applies to
non-linear codes as well. We also show that under two (practical) relaxations
of the problem setting, these lower bounds can be met for both read and
download simultaneously.
|
[{'version': 'v1', 'created': 'Mon, 31 Dec 2012 19:22:07 GMT'}
{'version': 'v2', 'created': 'Tue, 2 Apr 2013 05:49:39 GMT'}]
|
2016-11-15
|
[array(['Shah', 'Nihar B.', ''], dtype=object)]
|
1,987 |
cond-mat/9406075
|
T. Xiang
|
T Xiang and J M Wheatley
|
Disorder effect in low dimensional superconductors
|
2 pages, uuencoded compressed postscript file, IRC-9406100
| null |
10.1016/0921-4534(94)92425-2
| null |
cond-mat
| null |
The quasiparticle density of states (DOS), the energy gap, the superfluid
density $\rho_s$, and the localization effect in the s- and d-wave
superconductors with non-magnetic impurity in two dimensions (2D) are studied
numerically. For strong (unitary) scatters, we find that it is the range of the
scattering potential rather than the symmetry of the superconducting pairing
which is more important in explaining the impurity dependences of the specific
heat and the superconducting transition temperature in Zn doped YBCO. The
localization length is longer in the d-wave superconducting state than in the
normal state, even in the vicinity of the Fermi energy.
|
[{'version': 'v1', 'created': 'Fri, 17 Jun 1994 10:26:08 GMT'}]
|
2009-10-22
|
[array(['Xiang', 'T', ''], dtype=object)
array(['Wheatley', 'J M', ''], dtype=object)]
|
1,988 |
2003.00800
|
Alessandro Betti
|
Alessandro Betti, Benedetto Michelozzi, Andrea Bracci and Andrea
Masini
|
Real-Time target detection in maritime scenarios based on YOLOv3 model
|
Paper presented at the 9th International Symposium on Optronics in
Defence & Security, 28-30 January 2020 (OPTRO2020, Paris). Oral Presentation
| null | null | null |
cs.CV cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work a novel ships dataset is proposed consisting of more than 56k
images of marine vessels collected by means of web-scraping and including 12
ship categories. A YOLOv3 single-stage detector based on Keras API is built on
top of this dataset. Current results on four categories (cargo ship, naval
ship, oil ship and tug ship) show Average Precision up to 96% for Intersection
over Union (IoU) of 0.5 and satisfactory detection performances up to IoU of
0.8. A Data Analytics GUI service based on QT framework and Darknet-53 engine
is also implemented in order to simplify the deployment process and analyse
massive amount of images even for people without Data Science expertise.
|
[{'version': 'v1', 'created': 'Mon, 10 Feb 2020 15:25:19 GMT'}]
|
2020-03-03
|
[array(['Betti', 'Alessandro', ''], dtype=object)
array(['Michelozzi', 'Benedetto', ''], dtype=object)
array(['Bracci', 'Andrea', ''], dtype=object)
array(['Masini', 'Andrea', ''], dtype=object)]
|
1,989 |
2205.05437
|
Ricardo Bortolotti
|
Ricardo Bortolotti, Eberson Ferreira da Silva
|
Dimension of a class of intrinsically transversal solenoidal attractors
in high dimensions
| null | null | null | null |
math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the fractal dimension of a class of solenoidal attractors in
dimensions greater or equal than 3, proving that if the contraction is
sufficiently strong, the expansion is close to conformal and the attractor
satisfy a geometrical condition of transversality between its components, then
the Hausdorff and box-counting dimension of every stable section of the
attractor have the same value, which corresponds to the zero of the topological
pressure as in Bowen's formula. We also calculate the dimension of the
attractor and prove that it is continuous in this class.
|
[{'version': 'v1', 'created': 'Wed, 11 May 2022 12:28:45 GMT'}
{'version': 'v2', 'created': 'Tue, 24 May 2022 12:26:30 GMT'}
{'version': 'v3', 'created': 'Fri, 12 Aug 2022 19:45:03 GMT'}]
|
2022-08-16
|
[array(['Bortolotti', 'Ricardo', ''], dtype=object)
array(['da Silva', 'Eberson Ferreira', ''], dtype=object)]
|
1,990 |
astro-ph/0611550
|
Sergei Trushkin
|
S. A. Trushkin, N. N. Bursov, N. A. Nizhelskij, E. K. Majorova, P. A.
Voitsik
|
What do we understand from multi-frequency monitoring of microquasars?
|
Proceedings VI Microquasar Workshop: Microquasars and beyond, Sept
18-22 2006, Como, Italy, eds: T. Belloni et al., 10 pages, 9 figures,
Published online at http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=33
|
PoSMQW6:015,2006
| null |
SAO-11-2006T
|
astro-ph
| null |
We discuss the results of the monitoring programs of the X-ray binaries with
relativistic jets studies. We carried out a multi-frequency (1-30 GHz) daily
monitoring of the radio flux variability of the microquasars SS433,
GRS1915+105, V4641 Sgr and Cyg X-3 with RATAN-600 radio telescope during the
recent sets in 2002-2006. We detected a lot of bright short-time flares from
GRS 1915+105 which could be associated with active X-ray events. In 2004 we
have detected two flares from V4641 Sgr, which followed after recurrent X-ray
activity of the transient. From September 2005 to May 2006 and then in July we
have daily measured flux densities from Cyg X-3. In January 2006 we detected a
drop down of its quiescent fluxes (from 100 to ~20 mJy), then the 1Jy-flare was
detected on 2 February 2006 after 18 days of quenched radio emission. The daily
spectra of the flare in the maximum were flat from 2 to 110 GHz, using the
quasi-simultaneous observations at 110 GHz with the RT45m telescope and the NMA
millimeter array of the Nobeyama Radio Observatory in Japan. Several bright
radio flaring events (1-15 Jy) followed during the continuing state of very
variable and intensive 1-12 keV X-ray emission (~0.5 Crab), which was monitored
in the RXTE ASM program. We discuss the various spectral and temporal
characteristics of the light curves from the microquasars. Thus we conclude
that monitoring of the flaring radio emission is a good tracer of jet activity
X-ray binaries.
|
[{'version': 'v1', 'created': 'Fri, 17 Nov 2006 08:34:38 GMT'}]
|
2008-11-26
|
[array(['Trushkin', 'S. A.', ''], dtype=object)
array(['Bursov', 'N. N.', ''], dtype=object)
array(['Nizhelskij', 'N. A.', ''], dtype=object)
array(['Majorova', 'E. K.', ''], dtype=object)
array(['Voitsik', 'P. A.', ''], dtype=object)]
|
1,991 |
cond-mat/0608313
|
Ilya Elfimov
|
I.S. Elfimov, A. Rusydi, S.I. Csiszar, Z. Hu, H.H. Hsieh, H.-J. Lin,
C.T. Chen, R. Liang, and G.A. Sawatzky
|
Nitrogen based magnetic semiconductors
|
5 papges, 5 figures
| null | null | null |
cond-mat.str-el
| null |
We describe a possible pathway to new magnetic materials with no conventional
magnetic elements present. The substitution of Nitrogen for Oxygen in simple
non magnetic oxides leads to holes in N 2$p$ states which form local magnetic
moments. Because of the very large Hund's rule coupling of Nitrogen and O 2$p$
electrons and the rather extended spatial extend of the wave functions these
materials are predicted to be ferromagnetic metals or small band gap
insulators. Experimental studies support the theoretical calculations with
regard to the basic electronic structure and the formation of local magnetic
moments. It remains to be seen if these materials are magnetically ordered and
if so below what temperature.
|
[{'version': 'v1', 'created': 'Mon, 14 Aug 2006 17:44:20 GMT'}]
|
2007-05-23
|
[array(['Elfimov', 'I. S.', ''], dtype=object)
array(['Rusydi', 'A.', ''], dtype=object)
array(['Csiszar', 'S. I.', ''], dtype=object)
array(['Hu', 'Z.', ''], dtype=object)
array(['Hsieh', 'H. H.', ''], dtype=object)
array(['Lin', 'H. -J.', ''], dtype=object)
array(['Chen', 'C. T.', ''], dtype=object)
array(['Liang', 'R.', ''], dtype=object)
array(['Sawatzky', 'G. A.', ''], dtype=object)]
|
1,992 |
1705.04413
|
Weifeng Rao
|
Wei-Feng Rao, Ye-Chuan Xu, John W. Morris Jr., Armen G. Khachaturyan
|
Responses of Pre-transitional Materials with Stress-Generating Defects
to External Stimuli: Superelasticity, Supermagnetostriction, Invar and
Elinvar Effects
|
34 Pages, 10 Figures
| null | null | null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We considered a generic case of pre-transitional materials with static
stress-generating defects, dislocations and coherent nano-precipitates, at
temperatures close but above the starting temperature of martensitic
transformation, Ms. Using the Phase Field Microelasticity theory and 3D
simulation, we demonstrated that the local stress generated by these defects
produces equilibrium nano-size martensitic embryos (MEs) in pre-transitional
state, these embryos being orientation variants of martensite. This is a new
type of equilibrium: the thermoelastic equilibrium between the MEs and parent
phase in which the total volume of MEs and their size are equilibrium internal
thermodynamic parameters. This thermoelastic equilibrium exists only in
presence of the stress-generating defects. Cooling the pre-transitional state
towards Ms or applying the external stimuli, stress or magnetic field, results
in a shift of the thermoelastic equilibrium provided by a reversible
anhysteretic growth of MEs that results in a giant ME-generated macroscopic
strain. In particular, this effect can be associated with the diffuse phase
transformations observed in some ferroelectrics above the Curie point. It is
shown that the ME-generated strain is giant and describes a superelasticity if
the applied field is stress. It describes a super magnetostriction if the
martensite (or austenite) are ferromagnetic and the applied field is a magnetic
field. In general, the material with defects can be a multiferroic with a giant
multiferroic response if the parent and martensitic phase have different
ferroic properties. Finally the ME-generated strain may explain or, at least,
contribute to the Invar and Elinvar effects that are typically observed in
pre-transitional austenite. The thermoelastic equilibrium and all these effects
exist only if the interaction between the defects and MEs is infinite-range.
|
[{'version': 'v1', 'created': 'Fri, 12 May 2017 01:17:01 GMT'}]
|
2017-05-15
|
[array(['Rao', 'Wei-Feng', ''], dtype=object)
array(['Xu', 'Ye-Chuan', ''], dtype=object)
array(['Morris', 'John W.', 'Jr.'], dtype=object)
array(['Khachaturyan', 'Armen G.', ''], dtype=object)]
|
1,993 |
1604.01709
|
Dionisio Bazeia
|
D. Bazeia, E.E.M. Lima, L. Losano
|
High Temperature Effects on Compactlike Structures
|
6 pages, 4 figures; version to apppear in EPJC
|
Eur. Phys. J. C 76 (2016) 418
|
10.1140/epjc/s10052-016-4272-9
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we investigate the transition from kinks to compactons at high
temperatures. We deal with a family of models, described by a real scalar field
with standard kinematics, controlled by a single parameter, real and positive.
The family of models supports kinklike solutions, and the solutions tend to
become compact when the parameter increases to larger and larger values. We
study the one-loop corrections at finite temperature, to see how the thermal
effects add to the effective potential. The results suggest that the symmetry
is restored at very high temperatures.
|
[{'version': 'v1', 'created': 'Wed, 6 Apr 2016 17:50:20 GMT'}
{'version': 'v2', 'created': 'Mon, 23 May 2016 16:45:44 GMT'}
{'version': 'v3', 'created': 'Tue, 19 Jul 2016 12:44:17 GMT'}]
|
2016-08-09
|
[array(['Bazeia', 'D.', ''], dtype=object)
array(['Lima', 'E. E. M.', ''], dtype=object)
array(['Losano', 'L.', ''], dtype=object)]
|
1,994 |
2103.01713
|
Noortje Venhuizen
|
Noortje J. Venhuizen and Petra Hendriks and Matthew W. Crocker and
Harm Brouwer
|
Distributional Formal Semantics
|
To appear in: Information and Computation (WoLLIC 2019 Special Issue)
| null | null | null |
cs.CL cs.AI cs.IT math.IT
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Natural language semantics has recently sought to combine the complementary
strengths of formal and distributional approaches to meaning. More
specifically, proposals have been put forward to augment formal semantic
machinery with distributional meaning representations, thereby introducing the
notion of semantic similarity into formal semantics, or to define
distributional systems that aim to incorporate formal notions such as
entailment and compositionality. However, given the fundamentally different
'representational currency' underlying formal and distributional approaches -
models of the world versus linguistic co-occurrence - their unification has
proven extremely difficult. Here, we define a Distributional Formal Semantics
that integrates distributionality into a formal semantic system on the level of
formal models. This approach offers probabilistic, distributed meaning
representations that are also inherently compositional, and that naturally
capture fundamental semantic notions such as quantification and entailment.
Furthermore, we show how the probabilistic nature of these representations
allows for probabilistic inference, and how the information-theoretic notion of
"information" (measured in terms of Entropy and Surprisal) naturally follows
from it. Finally, we illustrate how meaning representations can be derived
incrementally from linguistic input using a recurrent neural network model, and
how the resultant incremental semantic construction procedure intuitively
captures key semantic phenomena, including negation, presupposition, and
anaphoricity.
|
[{'version': 'v1', 'created': 'Tue, 2 Mar 2021 13:38:00 GMT'}]
|
2021-03-03
|
[array(['Venhuizen', 'Noortje J.', ''], dtype=object)
array(['Hendriks', 'Petra', ''], dtype=object)
array(['Crocker', 'Matthew W.', ''], dtype=object)
array(['Brouwer', 'Harm', ''], dtype=object)]
|
1,995 |
1803.00119
|
Rohan Chitnis
|
Rohan Chitnis, Leslie Pack Kaelbling, and Tom\'as Lozano-P\'erez
|
Integrating Human-Provided Information Into Belief State Representation
Using Dynamic Factorization
|
IROS 2018 final version
| null | null | null |
cs.AI cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In partially observed environments, it can be useful for a human to provide
the robot with declarative information that represents probabilistic relational
constraints on properties of objects in the world, augmenting the robot's
sensory observations. For instance, a robot tasked with a search-and-rescue
mission may be informed by the human that two victims are probably in the same
room. An important question arises: how should we represent the robot's
internal knowledge so that this information is correctly processed and combined
with raw sensory information? In this paper, we provide an efficient belief
state representation that dynamically selects an appropriate factoring,
combining aspects of the belief when they are correlated through information
and separating them when they are not. This strategy works in open domains, in
which the set of possible objects is not known in advance, and provides
significant improvements in inference time over a static factoring, leading to
more efficient planning for complex partially observed tasks. We validate our
approach experimentally in two open-domain planning problems: a 2D discrete
gridworld task and a 3D continuous cooking task. A supplementary video can be
found at http://tinyurl.com/chitnis-iros-18.
|
[{'version': 'v1', 'created': 'Wed, 28 Feb 2018 22:29:29 GMT'}
{'version': 'v2', 'created': 'Fri, 15 Jun 2018 19:29:13 GMT'}
{'version': 'v3', 'created': 'Tue, 26 Jun 2018 16:47:23 GMT'}
{'version': 'v4', 'created': 'Mon, 30 Jul 2018 13:46:48 GMT'}]
|
2018-07-31
|
[array(['Chitnis', 'Rohan', ''], dtype=object)
array(['Kaelbling', 'Leslie Pack', ''], dtype=object)
array(['Lozano-Pérez', 'Tomás', ''], dtype=object)]
|
1,996 |
1607.06413
|
Steve Awodey
|
Steve Awodey
|
A cubical model of homotopy type theory
|
Lecture notes from a series of lectures for the Stockholm Logic group
| null | null | null |
math.CT math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct an algebraic weak factorization system $(L, R)$ on the cartesian
cubical sets, in which the canonical path object factorization $A \to A^I \to
A\times A$ induced by the 1-cube $I$ is an $L$-$R$ factorization for any
$R$-object $A$.
|
[{'version': 'v1', 'created': 'Thu, 21 Jul 2016 18:12:04 GMT'}]
|
2016-07-22
|
[array(['Awodey', 'Steve', ''], dtype=object)]
|
1,997 |
1611.06908
|
Ava Khamseh
|
Peter Boyle, Luigi Del Debbio, Ava Khamseh
|
A massive momentum-subtraction scheme
| null |
Phys. Rev. D 95, 054505 (2017)
|
10.1103/PhysRevD.95.054505
| null |
hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new renormalization scheme is defined for fermion bilinears in QCD at non
vanishing quark masses. This new scheme, denoted RI/mSMOM, preserves the
benefits of the nonexceptional momenta introduced in the RI/SMOM scheme, and
allows a definition of renormalized composite fields away from the chiral
limit. Some properties of the scheme are investigated by performing explicit
one-loop computation in dimensional regularization.
|
[{'version': 'v1', 'created': 'Mon, 21 Nov 2016 17:21:10 GMT'}]
|
2017-03-15
|
[array(['Boyle', 'Peter', ''], dtype=object)
array(['Del Debbio', 'Luigi', ''], dtype=object)
array(['Khamseh', 'Ava', ''], dtype=object)]
|
1,998 |
2204.11783
|
Christos Verginis
|
Christos K. Verginis, Yiannis Kantaros, Dimos V. Dimarogonas
|
Planning and Control of Multi-Robot-Object Systems under Temporal Logic
Tasks and Uncertain Dynamics
|
arXiv admin note: text overlap with arXiv:1803.01579
| null | null | null |
eess.SY cs.RO cs.SY
|
http://creativecommons.org/licenses/by/4.0/
|
We develop an algorithm for the motion and task planning of a system
comprised of multiple robots and unactuated objects under tasks expressed as
Linear Temporal Logic (LTL) constraints. The robots and objects evolve subject
to uncertain dynamics in an obstacle-cluttered environment. The key part of the
proposed solution is the intelligent construction of a coupled transition
system that encodes the motion and tasks of the robots and the objects. We
achieve such a construction by designing appropriate adaptive control protocols
in the lower level, which guarantee the safe robot navigation/object
transportation in the environment while compensating for the dynamic
uncertainties. The transition system is efficiently interfaced with the
temporal logic specification via a sampling-based algorithm to output a
discrete path as a sequence of synchronized actions of the robots; such actions
satisfy the robots' as well as the objects' specifications. The robots execute
this discrete path by using the derived low level control protocol. Simulation
results verify the proposed framework.
|
[{'version': 'v1', 'created': 'Mon, 25 Apr 2022 16:51:25 GMT'}]
|
2022-04-26
|
[array(['Verginis', 'Christos K.', ''], dtype=object)
array(['Kantaros', 'Yiannis', ''], dtype=object)
array(['Dimarogonas', 'Dimos V.', ''], dtype=object)]
|
1,999 |
hep-th/9903113
|
Boris Pioline
|
N.A. Obers (Nordita and NBI) and B. Pioline (Ecole Polytechnique)
|
Eisenstein Series and String Thresholds
|
Latex2e, 60 pages; v2: Appendix A.4 extended, 2 refs added, thms
renumbered, plus minor corrections; v3: relation (1.7) to math Eis series
clarified, eq (3.3) and minor typos corrected, final version to appear in
Comm. Math. Phys; v4: misprints and Eq C.13,C.24 corrected, see note added
|
Commun.Math.Phys.209:275-324,2000
|
10.1007/s002200050022
|
NORDITA-1999/18 HE, NBI-HE-99-06, CPHT-S710-0299
|
hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the relevance of Eisenstein series for representing certain
$G(Z)$-invariant string theory amplitudes which receive corrections from BPS
states only. $G(Z)$ may stand for any of the mapping class, T-duality and
U-duality groups $Sl(d,Z)$, $SO(d,d,Z)$ or $E_{d+1(d+1)}(Z)$ respectively.
Using $G(Z)$-invariant mass formulae, we construct invariant modular functions
on the symmetric space $K\backslash G(R)$ of non-compact type, with $K$ the
maximal compact subgroup of $G(R)$, that generalize the standard
non-holomorphic Eisenstein series arising in harmonic analysis on the
fundamental domain of the Poincar\'e upper half-plane. Comparing the
asymptotics and eigenvalues of the Eisenstein series under second order
differential operators with quantities arising in one- and $g$-loop string
amplitudes, we obtain a manifestly T-duality invariant representation of the
latter, conjecture their non-perturbative U-duality invariant extension, and
analyze the resulting non-perturbative effects. This includes the $R^4$ and
$R^4 H^{4g-4}$ couplings in toroidal compactifications of M-theory to any
dimension $D\geq 4$ and $D\geq 6$ respectively.
|
[{'version': 'v1', 'created': 'Fri, 12 Mar 1999 18:52:36 GMT'}
{'version': 'v2', 'created': 'Wed, 17 Mar 1999 19:08:17 GMT'}
{'version': 'v3', 'created': 'Fri, 10 Dec 1999 14:58:50 GMT'}
{'version': 'v4', 'created': 'Fri, 15 Jan 2010 06:16:07 GMT'}]
|
2014-11-18
|
[array(['Obers', 'N. A.', '', 'Nordita and NBI'], dtype=object)
array(['Pioline', 'B.', '', 'Ecole Polytechnique'], dtype=object)]
|
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