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Suchet Sapre
Suchet Sapre, Pouyan Ahmadi and Khondkar Islam
A Robust Comparison of the KDDCup99 and NSL-KDD IoT Network Intrusion Detection Datasets Through Various Machine Learning Algorithms
8 pages, 13 figures
null
null
null
cs.LG cs.CR cs.NI stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent years, as intrusion attacks on IoT networks have grown exponentially, there is an immediate need for sophisticated intrusion detection systems (IDSs). A vast majority of current IDSs are data-driven, which means that one of the most important aspects of this area of research is the quality of the data acquired from IoT network traffic. Two of the most cited intrusion detection datasets are the KDDCup99 and the NSL-KDD. The main goal of our project was to conduct a robust comparison of both datasets by evaluating the performance of various Machine Learning (ML) classifiers trained on them with a larger set of classification metrics than previous researchers. From our research, we were able to conclude that the NSL-KDD dataset is of a higher quality than the KDDCup99 dataset as the classifiers trained on it were on average 20.18% less accurate. This is because the classifiers trained on the KDDCup99 dataset exhibited a bias towards the redundancies within it, allowing them to achieve higher accuracies.
[ { "created": "Tue, 31 Dec 2019 07:36:33 GMT", "version": "v1" } ]
2020-01-01
[ [ "Sapre", "Suchet", "" ], [ "Ahmadi", "Pouyan", "" ], [ "Islam", "Khondkar", "" ] ]
19
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1,225,100
1912.13205
Ma Elena Hern\'andez-Hern\'andez
Ma. Elena Hern\'andez-Hern\'andez and Saul Jacka and Aleksandar Mijatovi\'c
Martingale approach to control for general jump processes
null
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide verification theorems (at different levels of generality) for infinite horizon stochastic control problems in continuous time for semimartingales. The control framework is given as an abstract "martingale formulation", which encompasses a broad range of standard control problems. Under appropriate conditions we show that the set of admissible controls gives rise to a certain class of controlled special semimartingales. Our results generalise both the standard controlled It\^o- and L\'evy-diffusion settings as we allow ourselves to locally control not only the drift and diffusion coefficients, but also the jump intensity measure of the jumps. As an illustration, we present a few examples with explicit solutions.
[ { "created": "Tue, 31 Dec 2019 07:38:11 GMT", "version": "v1" } ]
2020-01-01
[ [ "Hernández-Hernández", "Ma. Elena", "" ], [ "Jacka", "Saul", "" ], [ "Mijatović", "Aleksandar", "" ] ]
19
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1,225,101
1912.13206
Yoonsang Park
Yoonsang Park, Yuxuan Zhang, Maryam Majzoubi, Timo Scholehwar, Eberhard Hennig, Kenji Uchino
Improvement of the Standard Characterization Method on k33 Mode Piezoelectric Specimens
Total 33 pages including reference, figure captions and tables. 6 figures, 3 tables. Reason for the replacement: Corrected typos and minor grammatical errors, Change in Reference
null
10.1016/j.sna.2020.112124
null
physics.app-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Even though standard method to determine physical parameters of piezoelectric materials has been set up for several decades, bare attention has been made on loss determination method. Furthermore, several deficits have been recognized in the standard method for k33 mode. In this study, detailed discussion on deficits of IEEE Standard k33 is investigated and the method to resolve such deficits will be introduced. The standard k33 specimen suffers from small capacitance, which causes huge experimental error, intrinsic electrical energy leakage, specimen setup issue and inability to directly determine intensive elastic properties. In order to resolve these issues, partial electrode method was introduced, and curve fitting was demonstrated to determine physical parameters and losses.
[ { "created": "Tue, 31 Dec 2019 07:39:57 GMT", "version": "v1" }, { "created": "Fri, 3 Jan 2020 12:44:49 GMT", "version": "v2" } ]
2021-05-25
[ [ "Park", "Yoonsang", "" ], [ "Zhang", "Yuxuan", "" ], [ "Majzoubi", "Maryam", "" ], [ "Scholehwar", "Timo", "" ], [ "Hennig", "Eberhard", "" ], [ "Uchino", "Kenji", "" ] ]
19
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1,225,102
1912.13207
Mauro Paternostro
Cillian Harney, Stefano Pirandola, Alessandro Ferraro, Mauro Paternostro
Entanglement Classification via Neural Network Quantum States
11 pages, 9 figures, RevTeX4
null
10.1088/1367-2630/ab783d
null
quant-ph cond-mat.dis-nn cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The task of classifying the entanglement properties of a multipartite quantum state poses a remarkable challenge due to the exponentially increasing number of ways in which quantum systems can share quantum correlations. Tackling such challenge requires a combination of sophisticated theoretical and computational techniques. In this paper we combine machine-learning tools and the theory of quantum entanglement to perform entanglement classification for multipartite qubit systems in pure states. We use a parameterisation of quantum systems using artificial neural networks in a restricted Boltzmann machine (RBM) architecture, known as Neural Network Quantum States (NNS), whose entanglement properties can be deduced via a constrained, reinforcement learning procedure. In this way, Separable Neural Network States (SNNS) can be used to build entanglement witnesses for any target state.
[ { "created": "Tue, 31 Dec 2019 07:40:23 GMT", "version": "v1" } ]
2020-06-24
[ [ "Harney", "Cillian", "" ], [ "Pirandola", "Stefano", "" ], [ "Ferraro", "Alessandro", "" ], [ "Paternostro", "Mauro", "" ] ]
19
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1,225,103
1912.13208
Shuxun Tian
S. X. Ti\'an
Cosmological consequences of a scalar field with oscillating equation of state: A possible solution to the fine-tuning and coincidence problems
7 pages, 3 figures, matches published version
Phys. Rev. D 101, 063531 (2020)
10.1103/PhysRevD.101.063531
null
astro-ph.CO gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new dark energy model for solving the cosmological fine-tuning and coincidence problems. A default assumption is that the fine-tuning problem disappears if we do not interpret dark energy as vacuum energy. The key idea to solving the coincidence problem is that the Universe may have several acceleration phases across the whole cosmic history. The specific example we study is a quintessence model with approximately repeated double exponential potential, which only introduces one Planck scale parameter and three dimensionless parameters of order unity. The cosmological background evolution equations can be recast into a four-dimensional dynamical system and its main properties are discussed in details. Preliminary calculations show that our model is able to explain the observed cosmic late-time acceleration.
[ { "created": "Tue, 31 Dec 2019 07:41:41 GMT", "version": "v1" }, { "created": "Thu, 26 Mar 2020 15:58:07 GMT", "version": "v2" } ]
2020-03-27
[ [ "Tián", "S. X.", "" ] ]
19
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1,225,104
1912.13209
Matt Darnley
Matthew J. Darnley
Accrete, Accrete, Accrete... Bang! (and repeat): The Remarkable Recurrent Novae
A review article now accepted to appear within The Golden Age of Cataclysmic Variables and Related Objects V, Proceedings of Science. 19 pages, 2 figures, 1 table
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null
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astro-ph.SR astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
All novae recur, but only a handful have been observed in eruption more than once. These systems, the recurrent novae (RNe), are among the most extreme examples of novae. RNe have long been thought of as potential type Ia supernova progenitors, and their claim to this 'accolade' has recently been strengthened. In this short review RNe will be presented within the framework of the maximum magnitude-rate of decline (MMRD) phase-space. Recent work integrating He-flashes into nova models, and the subsequent growth of the white dwarf, will be explored. This review also presents an overview of the Galactic and extragalactic populations of RNe, including the newly identified 'rapid recurrent nova' subset - those with recurrence periods of ten years, or less. The most exciting nova system yet discovered - M31N 2008-12a, with its annual eruptions and vast nova super-remnant, is introduced. Throughout, open questions regarding RNe, and some of the expected challenges and opportunities that the near future will bring are addressed.
[ { "created": "Tue, 31 Dec 2019 07:47:01 GMT", "version": "v1" }, { "created": "Fri, 13 Mar 2020 15:36:38 GMT", "version": "v2" } ]
2020-03-16
[ [ "Darnley", "Matthew J.", "" ] ]
19
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1,225,105
1912.13210
Yoonsang Park
Yoonsang Park, Maryam Majzoubi, Yuxuan Zhang, Timo Scholehwar, Eberhard Hennig, Kenji Uchino
Analytical Modeling of k33 Mode Partial Electrode Configuration for Loss Characterization
24 pages, 5 figures and 3 tables. Reason for the replacement: Corrected typos and minor grammatical errors, Change in Reference
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10.1063/1.5143728
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physics.app-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Accurate determination of three types of losses (dielectric, elastic and piezoelectric) in piezoelectric materials is critical, since they are closely related to the performance of high-power piezoelectric devices. The Standard k33 mode has a number of serious deficits that hinders researchers from determining accurate physical parameters and losses. In order to overcome such deficits, partial electrode has been devised and proposed. This study provides analytical derivation process and proposes parameter determination method by utilizing analytical solutions. Compared to finite element analysis, analytical solutions show 0.1 % difference in resonance frequencies and 2 % difference in mechanical quality factors, proving them as valid modeling. The analytical solutions are fitted to experimental data to determine physical parameters and losses. The k33 (electromechanical coupling factor) values were calculated with determined values from curve fitting in two different ways and show good agreement to each other.
[ { "created": "Tue, 31 Dec 2019 07:50:44 GMT", "version": "v1" }, { "created": "Fri, 3 Jan 2020 12:46:40 GMT", "version": "v2" } ]
2021-05-25
[ [ "Park", "Yoonsang", "" ], [ "Majzoubi", "Maryam", "" ], [ "Zhang", "Yuxuan", "" ], [ "Scholehwar", "Timo", "" ], [ "Hennig", "Eberhard", "" ], [ "Uchino", "Kenji", "" ] ]
19
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1,225,106
1912.13211
Xin Shi
Yuzhen Yang, Suyu Xiao, Yunyun Fan, Dejun Han, Zhijun Liang, Baohua Qi, Liaoshan Shi, Yuhang Tan, Xingan Zhang, Xin Shi
Charaterization of the first prototype IHEP-NDL LGAD sensor
null
null
null
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The timing measurement of charged particles using silicon detector is widely used in synchrotron source as X-ray detectors, in time-of-flight mass spectrometer and especially in large collider experiment. To reduce the drastically event pile-up of high-luminosity large hadron collider (HL-LHC), a new concept of 4-dimension detector including timing and positon has been proposed. One of the candidates for the 4-dimension detector is a new kind of silicon detector called Low Gain Avalanche Diode (LGAD). In China, Institute of High Energy Physics (IHEP) Chinese Academic Science cooperated with Novel Device Laboratory (NDL) at Beijing Normal University have fabricated a series of LGAD sensors. The characterization of the first prototype of IHEP-NDL sensors is presented including leakage current and sensor capacitance measurement. A test system for the time resolution of jitter term using pico-second laser and fast sampling rate oscilloscope is also setup, and the time resolution of 10 ps can be achieved with these sensors.
[ { "created": "Tue, 31 Dec 2019 07:56:26 GMT", "version": "v1" } ]
2020-01-01
[ [ "Yang", "Yuzhen", "" ], [ "Xiao", "Suyu", "" ], [ "Fan", "Yunyun", "" ], [ "Han", "Dejun", "" ], [ "Liang", "Zhijun", "" ], [ "Qi", "Baohua", "" ], [ "Shi", "Liaoshan", "" ], [ "Tan", "Yuhang", "" ], [ "Zhang", "Xingan", "" ], [ "Shi", "Xin", "" ] ]
19
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1,225,107
1912.13212
Shuta Nakajima
Shuta Nakajima
Upper tail large deviations for a class of distributions in First-passage percolation
13 pages, no figures
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider the first passage percolation with identical and independent exponentially distributions, called the Eden growth model, and we study the upper tail large deviations for the first passage time ${\rm T}$. Our main results prove that for any $\xi>0$ and $x\neq 0$, $\mathbb{P}({\rm T}(0,nx)>n(\mu+\xi))$ decays as $\exp{(-(2d\xi +o(1))n)}$ with a time constant $\mu$ and a dimension $d$. Moreover, we extend the result to stretched exponential distributions. On the contrary, we construct a continuous distribution with a finite exponential moment where the rate function does not exist.
[ { "created": "Tue, 31 Dec 2019 08:06:07 GMT", "version": "v1" } ]
2020-01-01
[ [ "Nakajima", "Shuta", "" ] ]
19
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1,225,108
1912.13213
Francesco Orabona
Francesco Orabona
A Modern Introduction to Online Learning
Major update: Two new chapters (saddle-point optimization and universal portfolio); added missing proofs; fixed issues due to empty interior simplex; fixed a lot of typos
null
null
null
cs.LG math.OC stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this monograph, I introduce the basic concepts of Online Learning through a modern view of Online Convex Optimization. Here, online learning refers to the framework of regret minimization under worst-case assumptions. I present first-order and second-order algorithms for online learning with convex losses, in Euclidean and non-Euclidean settings. All the algorithms are clearly presented as instantiation of Online Mirror Descent or Follow-The-Regularized-Leader and their variants. Particular attention is given to the issue of tuning the parameters of the algorithms and learning in unbounded domains, through adaptive and parameter-free online learning algorithms. Non-convex losses are dealt through convex surrogate losses and through randomization. The bandit setting is also briefly discussed, touching on the problem of adversarial and stochastic multi-armed bandits. These notes do not require prior knowledge of convex analysis and all the required mathematical tools are rigorously explained. Moreover, all the included proofs have been carefully chosen to be as simple and as short as possible.
[ { "created": "Tue, 31 Dec 2019 08:16:31 GMT", "version": "v1" }, { "created": "Thu, 21 May 2020 19:03:07 GMT", "version": "v2" }, { "created": "Tue, 29 Dec 2020 22:14:47 GMT", "version": "v3" }, { "created": "Thu, 2 Sep 2021 16:17:34 GMT", "version": "v4" }, { "created": "Mon, 21 Mar 2022 00:55:54 GMT", "version": "v5" }, { "created": "Sun, 28 May 2023 03:00:10 GMT", "version": "v6" } ]
2023-05-30
[ [ "Orabona", "Francesco", "" ] ]
19
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1,225,109
1912.13214
Shadrokh Samavi
Mahdi Ahmadi, Nader Karimi, Shadrokh Samavi
Image Seam-Carving by Controlling Positional Distribution of Seams
Five pages, 4 figures
null
null
null
cs.CV eess.IV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Image retargeting is a new image processing task that renders the change of aspect ratio in images. One of the most famous image-retargeting algorithms is seam-carving. Although seam-carving is fast and straightforward, it usually distorts the images. In this paper, we introduce a new seam-carving algorithm that not only has the simplicity of the original seam-carving but also lacks the usual unwanted distortion existed in the original method. The positional distribution of seams is introduced. We show that the proposed method outperforms the original seam-carving in terms of retargeted image quality assessment and seam coagulation measures.
[ { "created": "Tue, 31 Dec 2019 08:17:55 GMT", "version": "v1" } ]
2020-01-01
[ [ "Ahmadi", "Mahdi", "" ], [ "Karimi", "Nader", "" ], [ "Samavi", "Shadrokh", "" ] ]
19
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1,225,110
1912.13215
Jiachen Jiang
Jiachen Jiang, Felix F\"urst, Dominic J. Walton, Michael L. Parker and Andrew C. Fabian
A NuSTAR View of GRS 1716$-$249 in the Hard and Intermediate States
10 pages, 7 figures, accepted by MNRAS
null
10.1093/mnras/staa017
null
astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a detailed analysis of the spectral properties of the black hole transient GRS 1716-249, based on the archival Swift and NuSTAR observations taken during the outburst of this source in 2016-2017. The first six NuSTAR observations show that the source is in a canonical hard state, where the spectrum is dominated by a power-law continuum. The seventh NuSTAR observation is taken during the intermediate state where both a disc thermal component and a power-law continuum are shown. All of our observations show a broad emission line feature in the iron band and a Compton hump above 10 keV. We model the broad band spectra using a high density disc reflection model, where the soft X-ray emission in the hard state is interpreted as part of the disc reflection component. This model enables us to constrain the disc density parameter of GRS 1716-249 in the range of $10^{19}$-$10^{20}$ cm$^{-3}$. We only obtain an upper limit of the inner disc radius using high density disc reflection spectroscopy and the results indicate either a non-truncated disc or a slightly truncated disc with $R_{\rm in}<20r_{\rm g}$.
[ { "created": "Tue, 31 Dec 2019 08:22:11 GMT", "version": "v1" } ]
2020-01-15
[ [ "Jiang", "Jiachen", "" ], [ "Fürst", "Felix", "" ], [ "Walton", "Dominic J.", "" ], [ "Parker", "Michael L.", "" ], [ "Fabian", "Andrew C.", "" ] ]
19
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1,225,111
1912.13216
Piero D'Ancona
Piero D'Ancona
On the supercritical defocusing NLW outside a ball
20 pages
null
null
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math.AP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a defocusing semilinear wave equation, with a power nonlinearity $|u|^{p-1}u$, defined outside the unit ball of $\mathbb{R}^{n}$, $n\ge3$, with Dirichlet boundary conditions. We prove that if $p>n+4$ and the initial data are nonradial perturbations of large radial data, there exists a global smooth solution. The solution is unique among energy class solutions satisfying an energy inequality. The main tools used are the Penrose transform and a pointwise decay estimate for the exterior linear wave equation perturbed with a large, time dependent potential.
[ { "created": "Tue, 31 Dec 2019 08:37:51 GMT", "version": "v1" }, { "created": "Tue, 28 Jul 2020 16:40:48 GMT", "version": "v2" } ]
2020-07-29
[ [ "D'Ancona", "Piero", "" ] ]
19
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1,225,112
1912.13217
Hong-Fu Wang
Lu Qi, Yan Xing, Guo-Li Wang, Shou Zhang, Hong-Fu Wang
Topological and nontopological edge states induced by qubit-assisted coupling potentials
10 pages,9 figures
null
10.1002/andp.202000067
null
quant-ph cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the usual Su-Schrieffer-Heeger (SSH) chain, the topology of the energy spectrum is divided into two categories in different parameter regions. Here we study the topological and nontopological edge states induced by qubit-assisted coupling potentials in circuit quantum electrodynamics (QED) lattice system modelled as a SSH chain. We find that, when the coupling potential added on only one end of the system raises to a certain extent, the strong coupling potential will induce a new topologically nontrivial phase accompanied with the appearance of a nontopological edge state in the whole parameter region, and the novel phase transition leads to the inversion of odd-even effect in the system directly. Furthermore, we also study the topological properties as well as phase transitions when two unbalanced coupling potentials are injected into both the ends of the circuit QED lattice system, and find that the system exhibits three distinguishing phases in the process of multiple flips of energy bands. These phases are significantly different from the previous phase induced via unilateral coupling potential, which is reflected by the existence of a pair of nontopological edge states under strong coupling potential regime. Our scheme provides a feasible and visible method to induce a variety of different kinds of topological and nontopological edge states through controlling the qubit-assisted coupling potentials in circuit QED lattice system both in experiment and theory.
[ { "created": "Tue, 31 Dec 2019 08:37:59 GMT", "version": "v1" } ]
2020-08-26
[ [ "Qi", "Lu", "" ], [ "Xing", "Yan", "" ], [ "Wang", "Guo-Li", "" ], [ "Zhang", "Shou", "" ], [ "Wang", "Hong-Fu", "" ] ]
19
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1,225,113
1912.13218
Burt Totaro
Burt Totaro
The integral cohomology of the Hilbert scheme of points on a surface
6 pages
Forum of Mathematics, Sigma 8 (2020) e40
10.1017/fms.2020.35
null
math.AG math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that if X is a smooth complex projective surface with torsion-free cohomology, then the Hilbert scheme X^[n] has torsion-free cohomology for every natural number n. This extends earlier work by Markman on the case of Poisson surfaces. The proof uses Gholampour-Thomas's reduced obstruction theory for nested Hilbert schemes of surfaces.
[ { "created": "Tue, 31 Dec 2019 08:38:13 GMT", "version": "v1" } ]
2020-11-11
[ [ "Totaro", "Burt", "" ] ]
19
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1,225,114
1912.13219
Joackim Bernier
Joackim Bernier (IMT)
Exact splitting methods for semigroups generated by inhomogeneous quadratic differential operators
null
null
null
null
math.AP cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce some general tools to design exact splitting methods to compute numerically semigroups generated by inhomogeneous quadratic differential operators. More precisely, we factorize these semigroups as products of semigroups that can be approximated efficiently, using, for example, pseudo-spectral methods. We highlight the efficiency of these new methods on the examples of the magnetic linear Schr{\"o}dinger equations with quadratic potentials, some transport equations and some Fokker-Planck equations.
[ { "created": "Tue, 31 Dec 2019 08:44:25 GMT", "version": "v1" }, { "created": "Fri, 27 Nov 2020 15:46:05 GMT", "version": "v2" } ]
2020-11-30
[ [ "Bernier", "Joackim", "", "IMT" ] ]
19
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1,225,115
1912.13220
Jeong-Hyuck Park
Kyoungho Cho, Kevin Morand, and Jeong-Hyuck Park
Stringy Newton Gravity with $H$-flux
6 pages, No figure, v2) Refs added
Phys. Rev. D 101, 064020 (2020)
10.1103/PhysRevD.101.064020
null
hep-th astro-ph.GA gr-qc hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Symmetry Principle has been shown to augment unambiguously the Einstein Field Equations, promoting the whole closed-string massless NS-NS sector to stringy graviton fields. Here we consider its weak field approximation, take a non-relativistic limit, and derive the stringy augmentation of Newton Gravity: \[ \begin{array}{lll} {\bf{\nabla}^{2}\Phi}=4\pi G \rho+\bf{H}{\bf{\cdot}}\bf{H}\,, \quad&\qquad\bf{\nabla}\bf{\cdot}\bf{H}=0\,, \quad&\qquad {\bf{\nabla}\bf{\times}\bf{H}}=4\pi G\, \bf{K}\,. \end{array} \] Not only the mass density $\rho$ but also the current density $\mathbf{K}$ is intrinsic to matter. Sourcing $\mathbf{H}$ which is of NS-NS $H$-flux origin, $\mathbf{K}$ is nontrivial if the matter is `stringy'. $\mathbf{H}$ contributes quadratically to the Newton potential, but otherwise is decoupled from the point particle dynamics, i.e. $\bf{\ddot{x}}=-\bf{\nabla}\Phi$. We define `stringization' analogous to magnetization and discuss regular as well as monopole-like singular solutions.
[ { "created": "Tue, 31 Dec 2019 08:46:49 GMT", "version": "v1" }, { "created": "Fri, 13 Mar 2020 05:37:47 GMT", "version": "v2" } ]
2020-03-16
[ [ "Cho", "Kyoungho", "" ], [ "Morand", "Kevin", "" ], [ "Park", "Jeong-Hyuck", "" ] ]
19
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1,225,116
1912.13221
Joackim Bernier
Joackim Bernier (IMT), Nicolas Crouseilles (MINGUS, UNIV-RENNES), Yingzhe Li (UCAS, MINGUS)
Exact splitting methods for kinetic and Schr{\"o}dinger equations
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null
null
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math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [8], some exact splittings are proposed for inhomogeneous quadratic differential equations including, for example, transport equations, kinetic equations, and Schr{\"o}dinger type equations with a rotation term. In this work, these exact splittings are combined with pseudo-spectral methods in space to illustrate their high accuracy and efficiency.
[ { "created": "Tue, 31 Dec 2019 08:48:07 GMT", "version": "v1" } ]
2020-01-01
[ [ "Bernier", "Joackim", "", "IMT" ], [ "Crouseilles", "Nicolas", "", "MINGUS, UNIV-RENNES" ], [ "Li", "Yingzhe", "", "UCAS, MINGUS" ] ]
19
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1,225,117
1912.13222
Zhan Yu
Zhan Yu, Daniel W. C. Ho
Distributed Stochastic Block Coordinate Descent for Time-Varying Multi-Agent Optimization
null
null
null
null
math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a class of large-scale distributed nonsmooth convex optimization problem over time-varying multi-agent network is investigated. Specifically, the decision space which can be split into several blocks of convex set is considered. We present a distributed block coordinate descent (DSBCD) method in which for each node, information communication with other agents and a block Bregman projection are performed in each iteration. In contrast to existing work, we do not require the projection is operated on the whole decision space. Instead, in each step, distributed projection procedure is performed on only one random block. The explicit formulation of the convergence level depending on random projection probabilities and network parameters is achieved. An expected $O(1/\sqrt{T})$ rate is achieved. In addition, we obtain an explicit $\mathcal{O}(b^2/\epsilon^2)$ complexity bound with target accuracy $\epsilon$ and characteristic constant factor $b$. The complexity with dependency on $\epsilon$ and $b$ is shown to be the best known in this literature.
[ { "created": "Tue, 31 Dec 2019 08:51:08 GMT", "version": "v1" } ]
2020-01-01
[ [ "Yu", "Zhan", "" ], [ "Ho", "Daniel W. C.", "" ] ]
19
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1,225,118
1912.13223
Bibhuti Kumar Jha
Bibhuti Kumar Jha, Bidya Binay Karak, Sudip Mandal and Dipankar Banerjee
Magnetic field dependence of bipolar magnetic region tilts on the Sun: Indication of tilt quenching
7 pages and 4 figures; Accepted for Publication in ApJL
2020 ApJL 889 L19
10.3847/2041-8213/ab665c
null
astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The tilt of bipolar magnetic region (BMR) is crucial in the Babcock--Leighton process for the generation of the poloidal magnetic field in Sun. Based on the thin flux tube model of the BMR formation, the tilt is believed to be caused by the Coriolis force acting on the rising flux tube of the strong toroidal magnetic field from the base of the convection zone (BCZ). We analyze the magnetic field dependence of BMR tilts using the magnetograms of Michelson Doppler Imager (MDI) (1996-2011) and Helioseismic and Magnetic Imager (HMI) (2010-2018). We observe that the distribution of the maximum magnetic field ($B_{\rm max}$) of BMRs is bimodal. Its first peak at the low field corresponds to BMRs which do not have sunspots as counterparts in the white light images, whereas the second peak corresponds to sunspots as recorded in both types of images. We find that the slope of Joy's law ($\gamma_0$) initially increases slowly with the increase of $B_{\rm max}$. However, when $B_{\rm max} \gtrsim 2$ kG, $\gamma_0$ decreases. Scatter of BMR tilt around Joy's law systematically decreases with the increase of $B_{\rm max}$. The decrease of observed $\gamma_0$ with $B_{\rm max}$ provides a hint to a nonlinear tilt quenching in the Babcock--Leighton process. We finally discuss how our results may be used to make a connection with the thin flux tube model.
[ { "created": "Tue, 31 Dec 2019 08:52:19 GMT", "version": "v1" } ]
2020-01-28
[ [ "Jha", "Bibhuti Kumar", "" ], [ "Karak", "Bidya Binay", "" ], [ "Mandal", "Sudip", "" ], [ "Banerjee", "Dipankar", "" ] ]
19
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1,225,119
1912.13224
Vincent Duval
Vincent Duval (MOKAPLAN, CEREMADE)
An Epigraphical Approach to the Representer Theorem
null
null
null
null
math.OC eess.SP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Describing the solutions of inverse problems arising in signal or image processing is an important issue both for theoretical and numerical purposes. We propose a principle which describes the solutions to convex variational problems involving a finite number of measurements. We discuss its optimality on various problems concerning the recovery of Radon measures.
[ { "created": "Tue, 31 Dec 2019 08:53:25 GMT", "version": "v1" }, { "created": "Tue, 4 Aug 2020 10:00:07 GMT", "version": "v2" } ]
2020-08-05
[ [ "Duval", "Vincent", "", "MOKAPLAN, CEREMADE" ] ]
19
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1,225,120
1912.13225
Frederic Nataf
Fr\'ed\'eric Nataf (LJLL (UMR\_7598), ALPINES)
Mathematical Analysis of Robustness of Two-Level Domain Decomposition Methods with respect to Inexact Coarse Solves
null
Numerische Mathematik, Springer Verlag, 2020, pp.811-833
10.1007/s00211-020-01102-6
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Convergence of domain decomposition methods rely heavily on the efficiency of the coarse space used in the second level. The GenEO coarse space has been shown to lead to a fully robust two-level Schwarz preconditioner which scales well over multiple cores [27, 19] as has been proved rigorously in [27]. The robustness is due to its good approximation properties for problems with highly heterogeneous material parameters. It is available in the finite element packages FreeFem++, Feel++ and recently in Dune and is implemented as a standalone library in HPDDM But the coarse component of the preconditioner can ultimately become a bottleneck if the number of subdomains is very large and exact solves are used. It is therefore interesting to consider the effect of approximate coarse solves. In this paper, robustness of GenEO methods is analyzed with respect to approximate coarse solves. Interestingly, the GenEO-2 method has to be modified in order to be able to prove its robustness in this context.
[ { "created": "Tue, 31 Dec 2019 08:54:35 GMT", "version": "v1" }, { "created": "Mon, 3 Aug 2020 09:14:31 GMT", "version": "v2" } ]
2020-08-04
[ [ "Nataf", "Frédéric", "", "LJLL" ] ]
19
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1,225,121
1912.13226
Yuntao Du
Yuntao Du, Zhiwen Tan, Qian Chen, Yi Zhang, Chongjun Wang
Homogeneous Online Transfer Learning with Online Distribution Discrepancy Minimization
null
null
null
ECAI 2020
cs.LG stat.ML
http://creativecommons.org/publicdomain/zero/1.0/
Transfer learning has been demonstrated to be successful and essential in diverse applications, which transfers knowledge from related but different source domains to the target domain. Online transfer learning(OTL) is a more challenging problem where the target data arrive in an online manner. Most OTL methods combine source classifier and target classifier directly by assigning a weight to each classifier, and adjust the weights constantly. However, these methods pay little attention to reducing the distribution discrepancy between domains. In this paper, we propose a novel online transfer learning method which seeks to find a new feature representation, so that the marginal distribution and conditional distribution discrepancy can be online reduced simultaneously. We focus on online transfer learning with multiple source domains and use the Hedge strategy to leverage knowledge from source domains. We analyze the theoretical properties of the proposed algorithm and provide an upper mistake bound. Comprehensive experiments on two real-world datasets show that our method outperforms state-of-the-art methods by a large margin.
[ { "created": "Tue, 31 Dec 2019 08:58:25 GMT", "version": "v1" } ]
2020-02-12
[ [ "Du", "Yuntao", "" ], [ "Tan", "Zhiwen", "" ], [ "Chen", "Qian", "" ], [ "Zhang", "Yi", "" ], [ "Wang", "Chongjun", "" ] ]
19
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1,225,122
1912.13227
Fenglei Tian
Fenglei Tian and Dein Wong
Characterization of graphs with some normalized Laplacian eigenvalue of multiplicity n-3
15 pages, 3 figures
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Graphs with few distinct eigenvalues have been investigated extensively. In this paper, we focus on another relevant topic: characterizing graphs with some eigenvalue of large multiplicity. Specifically, the normalized Laplacian matrix of a graph is considered here. Let $\rho_{n-1}(G)$ and $\nu(G)$ be the second least normalized Laplacian eigenvalue and the independence number of a graph $G$, respectively. As the main conclusions, two families of $n$-vertex connected graphs with some normalized Laplacian eigenvalue of multiplicity $n-3$ are determined: graphs with $\rho_{n-1}(G)=-1$ and graphs with $\rho_{n-1}(G)\neq -1$ and $\nu(G)\neq 2$. Moreover, it is proved that these graphs are determined by their spectrum.
[ { "created": "Tue, 31 Dec 2019 08:58:45 GMT", "version": "v1" } ]
2020-01-01
[ [ "Tian", "Fenglei", "" ], [ "Wong", "Dein", "" ] ]
19
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1,225,123
1912.13228
Yeshwant Valaulikar
Jervin Zen Lobo, Y.S. Valaulikar
Group classification of second order neutral differential equations
25 pages
null
null
null
math.CA math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we discuss the method of obtaining symmetries for second order nonhomogeneous neutral differential equations with variable coefficients. We use Taylor theorem for a function of several variables to obtain a Lie type invariance condition and the determining equations. Further we make a complete group classification of the second order linear neutral differential equation, for which there is no existing literature. As a special case, we present a complete group classification of the corresponding second order linear delay differential equation.
[ { "created": "Tue, 31 Dec 2019 09:02:55 GMT", "version": "v1" } ]
2020-01-01
[ [ "Lobo", "Jervin Zen", "" ], [ "Valaulikar", "Y. S.", "" ] ]
19
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0.5213986039161682, -1.395851969718933 ]
1,225,124
1912.13229
Yusuf Turek
Yusuf Turek
Effects of Postselected von Neumann Measurement on the Properties of Single-Mode Radiation Fields
12 pages, 30 figures
Chinese Phys. B 2020
10.1088/1674-1056/ab9f23
null
quant-ph
http://creativecommons.org/licenses/by/4.0/
Postselected von Neumann measurement characterized by postselection and weak value has been found potential applications in quantum metrology and, solved plenty of fundamental problems in quantum theory. As an application of this new measurement technique in quantum optics, its effects on the features of single-mode radiation fields such as coherent state, squeezed vacuum state and Schrodinger cat sate are investigated by considering full-order effects of unitary evolution. The results show that the conditional probabilities of finding photons, second-order correlation functions, Q-factors and squeezing effects of those states after postselected measurement significantly changed compared with corresponding initial pointer states, respectively.
[ { "created": "Tue, 31 Dec 2019 09:04:22 GMT", "version": "v1" }, { "created": "Tue, 21 Apr 2020 09:49:07 GMT", "version": "v2" }, { "created": "Tue, 28 Sep 2021 07:10:22 GMT", "version": "v3" } ]
2022-02-16
[ [ "Turek", "Yusuf", "" ] ]
19
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1,225,125
1912.13230
Vahid Noroozi
Vahid Noroozi, Sara Bahaadini, Samira Sheikhi, Nooshin Mojab, Philip S. Yu
Leveraging Semi-Supervised Learning for Fairness using Neural Networks
6 pages, 5 figures, accepted to ICMLA 2019
null
null
null
cs.LG cs.AI stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There has been a growing concern about the fairness of decision-making systems based on machine learning. The shortage of labeled data has been always a challenging problem facing machine learning based systems. In such scenarios, semi-supervised learning has shown to be an effective way of exploiting unlabeled data to improve upon the performance of model. Notably, unlabeled data do not contain label information which itself can be a significant source of bias in training machine learning systems. This inspired us to tackle the challenge of fairness by formulating the problem in a semi-supervised framework. In this paper, we propose a semi-supervised algorithm using neural networks benefiting from unlabeled data to not just improve the performance but also improve the fairness of the decision-making process. The proposed model, called SSFair, exploits the information in the unlabeled data to mitigate the bias in the training data.
[ { "created": "Tue, 31 Dec 2019 09:11:26 GMT", "version": "v1" } ]
2020-01-01
[ [ "Noroozi", "Vahid", "" ], [ "Bahaadini", "Sara", "" ], [ "Sheikhi", "Samira", "" ], [ "Mojab", "Nooshin", "" ], [ "Yu", "Philip S.", "" ] ]
19
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1,225,126
1912.13231
Hong-Fu Wang
Lu Qi, Yan Xing, Shutian Liu, Shou Zhang, Hong-Fu Wang
Topological phase induced by distinguishing parameter regimes in cavity optomechanical system with multiple mechanical resonators
null
Phys. Rev. A 101, 052325 (2020)
10.1103/PhysRevA.101.052325
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose two kinds of distinguishing parameter regimes to induce topological Su-Schrieffer-Heeger (SSH) phase in a one dimensional (1D) multi-resonator cavity optomechanical system via modulating the frequencies of both cavity fields and resonators. The introduction of the frequency modulations allows us to eliminate the Stokes heating process for the mapping of the tight-binding Hamiltonian without usual rotating wave approximation, which is totally different from the traditional mapping of the topological tight-binding model. We find that the tight-binding Hamiltonian can be mapped into a topological SSH phase via modifying the Bessel function originating from the frequency modulations of cavity fields and resonators, and the induced SSH phase is independent on the effective optomechanical coupling strength. On the other hand, the insensitivity of the system to the effective optomechanical coupling provides us another new path to induce the topological SSH phase based on the present 1D cavity optomechanical system. And we show that the system can exhibit a topological SSH phase via varying the effective optomechanical coupling strength in an alternative way, which is much more easier to be achieved in experiment. Furthermore, we also construct an analogous bosonic Kitaev model with the trivial topology by keeping the Stokes heating processes. Our scheme provides a steerable platform to investigate the effects of next-nearest-neighboring interactions on the topology of the system.
[ { "created": "Tue, 31 Dec 2019 09:15:47 GMT", "version": "v1" } ]
2020-05-20
[ [ "Qi", "Lu", "" ], [ "Xing", "Yan", "" ], [ "Liu", "Shutian", "" ], [ "Zhang", "Shou", "" ], [ "Wang", "Hong-Fu", "" ] ]
19
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1,225,127
1912.13232
Hossein Vahid Dastjerdi
Hossein Vahid Dastjerdi, Hamidreza Fallah, and Morteza Hajimahmoodzadeh
Investigating the effect of different quantum dots on the absorption spectrum and characteristics of quantum dot sensitized solar cells
null
null
null
null
physics.app-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum dot sensitized solar cells are among the new generations of solar cells that have attracted much attention. Theoretical and simulation studies have predicted high efficiency for these cells so that in the future, these cells could be an excellent alternative to silicon solar cells. Other advantages of these cells are their ease of fabrication and cheaper manufacturing methods than existing cells. This paper's main idea is to simulate the effect of different quantum dots on the optical and electrical characteristics of these cells and, in particular, the efficiency. We then simulated the effect of simultaneous sensitizing by different quantum dots, and we observed that the cell's light absorption and the efficiency in simultaneous sensitizing, increased. Then we experimentally studied one of the cells that give the best simulation result (PbS/CdS co-sensitized). We deposited the quantum dots on transparent TiO2, and we obtained the light absorption, efficiency, and other characteristics of cells. Further, we investigated the effect of cobalt sulfide as the counter electrode in PbS/CdS, instead of platinum and gold, and we found that the efficiency has increased.
[ { "created": "Tue, 31 Dec 2019 09:23:03 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2020 20:26:06 GMT", "version": "v2" }, { "created": "Sun, 26 Apr 2020 15:54:00 GMT", "version": "v3" }, { "created": "Thu, 16 Jul 2020 16:07:40 GMT", "version": "v4" } ]
2020-07-17
[ [ "Dastjerdi", "Hossein Vahid", "" ], [ "Fallah", "Hamidreza", "" ], [ "Hajimahmoodzadeh", "Morteza", "" ] ]
19
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1,225,128
1912.13233
Hong-Fu Wang
Lu Qi, Shutian Liu, Shou Zhang, Hong-Fu Wang
Controllable double quantum state transfers by one topological channel in a frequency-modulated optomechanical array
null
Optics Letters, 45, 2018-2021 (2020)
10.1364/OL.388835
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a scheme to achieve the quantum state transfer via the topological protected edge channel based on a one dimensional frequency-modulated optomechanical array. We find that the optomechanical array can be mapped into a Su-Schrieffer-Heeger model after eliminating the counter rotating wave terms via frequency modulations. By dint of the edge channel of the Su-Schrieffer-Heeger model, we show that the quantum state transfer between the photonic left edge state and the photonic right edge state can be achieved with a high fidelity. Specially, our scheme can also achieve another phononic quantum state transfer based on the same channel via controlling the next-nearest-neighboring interactions between the cavity fields, which is different from the previous investigations only achieving one kind of quantum state transfer. Our scheme provides a novel path to switch two different kinds of quantum state transfers in a controllable way.
[ { "created": "Tue, 31 Dec 2019 09:27:03 GMT", "version": "v1" } ]
2020-06-24
[ [ "Qi", "Lu", "" ], [ "Liu", "Shutian", "" ], [ "Zhang", "Shou", "" ], [ "Wang", "Hong-Fu", "" ] ]
19
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1,225,129
1912.13234
Manvir Kushwaha
Manvir S. Kushwaha
The fundamentals of harnessing the magneto-optics of quantum wires for designing optical amplifiers: Formalism
10 Figures
Mod. Phys. Lett. B 33, 1950062 (2019)
10.1142/S0217984919500623
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum wires occupy a unique status among the semiconducting nanostructures with reduced dimensionality -- no other system seems to have engaged researchers with as many appealing features to pursue. This paper aims at a core issue related with the magnetoplasmon excitations in the quantum wires characterized by the confining harmonic potential and subjected to a longitudinal electric field and a perpendicular magnetic field in the symmetric gauge. Despite the substantive complexity, we obtain the exact analytical expressions for the eigenfunction and eigenenergy, using the scheme of ladder operators, which fundamentally characterize the quantal system. Crucial to this inquiry is an intersubband collective excitation that evolves into a magnetoroton -- above a threshold value of magnetic field -- which observes a negative group velocity between the maxon and the roton. The evidence of negative group velocity implies anomalous dispersion in a gain medium with the population inversion that forms the basis for the lasing action of lasers. Thus, the technological pathway that unfolds is the route to devices exploiting the magnetoroton features for designing the novel optical amplifiers at nanoscale and hence paving the way to a new generation of lasers.
[ { "created": "Tue, 31 Dec 2019 09:27:46 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kushwaha", "Manvir S.", "" ] ]
19
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1,225,130
1912.13235
Ankit Kumar Singh
Ankit Kumar Singh, Antariksha Das, Sourin Das, and Nirmalya Ghosh
Spin selective scattering modes in random anisotropy optical medium
null
Phys. Rev. A 102, 033518 (2020)
10.1103/PhysRevA.102.033518
null
physics.optics cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Geometrical and dynamical phase have competing effects as far a scattering of light form inhomogeneous anisotropic optical medium is concerned. If fine-tuned appropriately, these effects can completely cancel each other for a chosen spin component while having an additive effect on the orthogonal components. Here, we show a manifestation of extraordinary spin selective modes in Fourier spectrum of Gaussian beam transmitted through anisotropic disordered medium. We realize the concept using a twisted nematic liquid crystal-based spatial light modulator (SLM) with random gray level distribution for incident Gaussian beam.
[ { "created": "Tue, 31 Dec 2019 09:30:19 GMT", "version": "v1" } ]
2020-09-28
[ [ "Singh", "Ankit Kumar", "" ], [ "Das", "Antariksha", "" ], [ "Das", "Sourin", "" ], [ "Ghosh", "Nirmalya", "" ] ]
19
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1,225,131
1912.13236
Xiao-Lei Liu
Xiao-Lei Liu
Fractional Dehn twists and modular invariants
This paper has been accepted for publication in SCIENCE CHINA Mathematics
null
null
null
math.AG math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this note, we establish a relationship between fractional Dehn twist coefficients of Riemann surface automorphisms and modular invariants of holomorphic families of algebraic curves. Specially, we give a characterization of pseudo-periodic maps with nontrivial fractional Dehn twist coefficients. We also obtain some uniform lower bounds of non-zero fractional Dehn twist coefficients.
[ { "created": "Tue, 31 Dec 2019 09:30:23 GMT", "version": "v1" }, { "created": "Mon, 22 Jun 2020 00:39:04 GMT", "version": "v2" } ]
2020-06-23
[ [ "Liu", "Xiao-Lei", "" ] ]
19
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1,225,132
1912.13237
Chen Chaoyu
Xiao-Ming Ma, Zhongjia Chen, Eike F. Schwier, Yang Zhang, Yu-Jie Hao, Rui'e Lu, Jifeng Shao, Yuanjun Jin, Meng Zeng, Xiang-Rui Liu, Zhanyang Hao, Ke Zhang, Wumiti Mansuer, Shiv Kumar, Chunyao Song, Yuan Wang, Boyan Zhao, Cai Liu, Ke Deng, Jiawei Mei, Kenya Shimada, Yue Zhao, Xingjiang Zhou, Bing Shen, Wen Huang, Chang Liu, Hu Xu, Chaoyu Chen
Hybridization-Induced Gapped and Gapless States on the Surfaces of Magnetic Topological Insulators
18 pages, 4 figures
Phys. Rev. B 102, 245136 (2020)
10.1103/PhysRevB.102.245136
null
cond-mat.str-el cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The layered MnBi2nTe3n+1 family represents the first intrinsic antiferromagnetic topological insulator (AFM TI, protected by a combination symmetry ) ever discovered, providing an ideal platform to explore novel physics such as quantum anomalous Hall effect at elevated temperature and axion electrodynamics. Recent angle-resolved photoemission spectroscopy (ARPES) experiments on this family have revealed that all terminations exhibit (nearly) gapless topological surface states (TSSs) within the AFM state, violating the definition of the AFM TI, as the surfaces being studied should be -breaking and opening a gap. Here we explain this curious paradox using a surface-bulk band hybridization picture. Combining ARPES and first-principles calculations, we prove that only an apparent gap is opened by hybridization between TSSs and bulk bands. The observed (nearly) gapless features are consistently reproduced by tight-binding simulations where TSSs are coupled to a Rashba-split bulk band. The Dirac-cone-like spectral features are actually of bulk origin, thus not sensitive to the-breaking at the AFM surfaces. This picture explains the (nearly) gapless behaviour found in both Bi2Te3- and MnBi2Te4-terminated surfaces and is applicable to all terminations of MnBi2nTe3n+1 family. Our findings highlight the role of band hybridization, superior to magnetism in this case, in shaping the general surface band structure in magnetic topological materials for the first time.
[ { "created": "Tue, 31 Dec 2019 09:31:21 GMT", "version": "v1" } ]
2020-12-24
[ [ "Ma", "Xiao-Ming", "" ], [ "Chen", "Zhongjia", "" ], [ "Schwier", "Eike F.", "" ], [ "Zhang", "Yang", "" ], [ "Hao", "Yu-Jie", "" ], [ "Lu", "Rui'e", "" ], [ "Shao", "Jifeng", "" ], [ "Jin", "Yuanjun", "" ], [ "Zeng", "Meng", "" ], [ "Liu", "Xiang-Rui", "" ], [ "Hao", "Zhanyang", "" ], [ "Zhang", "Ke", "" ], [ "Mansuer", "Wumiti", "" ], [ "Kumar", "Shiv", "" ], [ "Song", "Chunyao", "" ], [ "Wang", "Yuan", "" ], [ "Zhao", "Boyan", "" ], [ "Liu", "Cai", "" ], [ "Deng", "Ke", "" ], [ "Mei", "Jiawei", "" ], [ "Shimada", "Kenya", "" ], [ "Zhao", "Yue", "" ], [ "Zhou", "Xingjiang", "" ], [ "Shen", "Bing", "" ], [ "Huang", "Wen", "" ], [ "Liu", "Chang", "" ], [ "Xu", "Hu", "" ], [ "Chen", "Chaoyu", "" ] ]
19
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1,225,133
1912.13238
Alper Atamturk
Alper Atamturk and Vishnu Narayanan
Submodular Function Minimization and Polarity
null
null
null
BCOL 19.02, IEOR, UC Berkeley
math.OC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using polarity, we give an outer polyhedral approximation for the epigraph of set functions. For a submodular function, we prove that the corresponding polar relaxation is exact; hence, it is equivalent to the Lov\'asz extension. The polar approach provides an alternative proof for the convex hull description of the epigraph of a submodular function. Computational experiments show that the inequalities from outer approximations can be effective as cutting planes for solving submodular as well as non-submodular set function minimization problems.
[ { "created": "Tue, 31 Dec 2019 09:33:10 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2020 06:08:31 GMT", "version": "v2" }, { "created": "Tue, 8 Dec 2020 06:41:30 GMT", "version": "v3" } ]
2020-12-09
[ [ "Atamturk", "Alper", "" ], [ "Narayanan", "Vishnu", "" ] ]
19
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1,225,134
1912.13239
Kunihiko Yamauchi
Takao Kosaka, Kunihiko Yamauchi and Tamio Oguchi
DFT-Based Engineering of Dirac Surface Energy in Topological-Insulator Multilayers
5 pages, 5 figures, submitted for publication
null
null
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Aiming at the future spintronics device applications of the spin-polarized surface states in three-dimensional topological insulator, a highly insulating bulk state and a tunable Dirac cone surface state are required. Here we employ a slab model having hetero-structural Bi2Se3-related quintuple layers and perform first-principles simulations. Our computational results show that the Dirac-point energy can be optimally tuned by selecting an appropriate pair of materials so that the work function at the surface quintuple layer is slightly different from that at the inner quintuple layers. The ideal surface state is obtained in Bi2Te3/(Bi2Te2Se)4/Bi2Te3 slab, in which the Fermi lines show the significant warping effect and both the in-plane and the out-of-plane components of the spin polarization emerge.
[ { "created": "Tue, 31 Dec 2019 09:33:26 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kosaka", "Takao", "" ], [ "Yamauchi", "Kunihiko", "" ], [ "Oguchi", "Tamio", "" ] ]
19
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1,225,135
1912.13240
Tapas Baug
T. Baug, Ke Wang, Tie Liu, Mengyao Tang, Qizhou Zhang, Di Li, Eswaraiah Chakali, Sheng-Yuan Liu, Anandmayee Tej, Paul F. Goldsmith, Leonardo Bronfman, Sheng-Li Qin, Viktor L. Toth, Pak-Shing Li and Kee-Tae Kim
ALMA observations reveal no preferred outflow--filament and outflow--magnetic field orientations
18 pages, 2 tables, 6 figures (3 additional figures in Appendix); Accepted for publication in the Astrophysical Journal
null
10.3847/1538-4357/ab66b6
null
astro-ph.GA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a statistical study on the orientation of outflows with respect to large-scale filaments and the magnetic fields. Although filaments are widely observed toward Galactic star-forming regions, the exact role of filaments in star formation is unclear. Studies toward low-mass star-forming regions revealed both preferred and random orientation of outflows respective to the filament long-axes, while outflows in massive star-forming regions mostly oriented perpendicular to the host filaments, and parallel to the magnetic fields at similar physical scales. Here, we explore outflows in a sample of 11 protoclusters in HII regions, a more evolved stage compared to IRDCs, using ALMA CO (3-2) line observations. We identify a total of 105 outflow lobes in these protoclusters. Among the 11 targets, 7 are embedded within parsec-scale filamentary structures detected in $^{13}$CO line and 870 $\mu m$ continuum emissions. The angles between outflow axes and corresponding filaments ($\gamma_\mathrm{Fil}$) do not show any hint of preferred orientations (i.e., orthogonal or parallel as inferred in numerical models) with respect to the position angle of the filaments. Identified outflow lobes are also not correlated with the magnetic fields and Galactic plane position angles. Outflows associated with filaments aligned along the large-scale magnetic fields are also randomly orientated. Our study presents the first statistical results of outflow orientation respective to large-scale filaments and magnetic fields in evolved massive star-forming regions. The random distribution suggests a lack of alignment of outflows with filaments, which may be a result of the evolutionary stage of the clusters.
[ { "created": "Tue, 31 Dec 2019 09:36:35 GMT", "version": "v1" } ]
2020-02-19
[ [ "Baug", "T.", "" ], [ "Wang", "Ke", "" ], [ "Liu", "Tie", "" ], [ "Tang", "Mengyao", "" ], [ "Zhang", "Qizhou", "" ], [ "Li", "Di", "" ], [ "Chakali", "Eswaraiah", "" ], [ "Liu", "Sheng-Yuan", "" ], [ "Tej", "Anandmayee", "" ], [ "Goldsmith", "Paul F.", "" ], [ "Bronfman", "Leonardo", "" ], [ "Qin", "Sheng-Li", "" ], [ "Toth", "Viktor L.", "" ], [ "Li", "Pak-Shing", "" ], [ "Kim", "Kee-Tae", "" ] ]
19
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1.0458431243896484, -0.26396700739860535 ]
1,225,136
1912.13241
Alex Borisevich
Alex Borisevich
Series Resonant Matrix Converter Topology for EV DC Fast Charging
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eess.SY cs.SY eess.SP
http://creativecommons.org/licenses/by/4.0/
In this paper, we presented a matrix converter with a high-frequency DC link for EV DC fast charging applications. Introducing this topology allows eliminating electrolytic capacitors in DC link of the converter, which potentially increases the reliability and power density of the system. The converter uses bidirectionally blocking three-phase rectifier to generate a high-frequency square wave voltage for the series resonant LC DC/DC converter, eliminating one H-bridge in front of the resonant tank. Principles of high-frequency and low-frequency modulations are described. A low voltage prototype has been built and tested which demonstrated ZVS soft switching of all the transistors in the converter. Peak efficiency estimated as 98.0 % for state-of-the-art switches.
[ { "created": "Tue, 31 Dec 2019 09:42:56 GMT", "version": "v1" } ]
2020-01-01
[ [ "Borisevich", "Alex", "" ] ]
19
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1,225,137
1912.13242
Geoffrey Stewart Morrison
Geoffrey Stewart Morrison, Ewald Enzinger, Daniel Ramos, Joaqu\'in Gonz\'alez-Rodr\'iguez, Alicia Lozano-D\'iez
Statistical Models in Forensic Voice Comparison
Morrison, G.S., Enzinger, E., Ramos, D., Gonz\'alez-Rodr\'iguez, J., Lozano-D\'iez, A. (2020). Statistical models in forensic voice comparison. In Banks, D.L., Kafadar, K., Kaye, D.H., Tackett, M. (Eds.) Handbook of Forensic Statistics (Ch. 20, pp. 451-497). Boca Raton, FL: CRC
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stat.AP cs.SD eess.AS
http://creativecommons.org/licenses/by-nc-sa/4.0/
This chapter describes a number of signal-processing and statistical-modeling techniques that are commonly used to calculate likelihood ratios in human-supervised automatic approaches to forensic voice comparison. Techniques described include mel-frequency cepstral coefficients (MFCCs) feature extraction, Gaussian mixture model - universal background model (GMM-UBM) systems, i-vector - probabilistic linear discriminant analysis (i-vector PLDA) systems, deep neural network (DNN) based systems (including senone posterior i-vectors, bottleneck features, and embeddings / x-vectors), mismatch compensation, and score-to-likelihood-ratio conversion (aka calibration). Empirical validation of forensic-voice-comparison systems is also covered. The aim of the chapter is to bridge the gap between general introductions to forensic voice comparison and the highly technical automatic-speaker-recognition literature from which the signal-processing and statistical-modeling techniques are mostly drawn. Knowledge of the likelihood-ratio framework for the evaluation of forensic evidence is assumed. It is hoped that the material presented here will be of value to students of forensic voice comparison and to researchers interested in learning about statistical modeling techniques that could potentially also be applied to data from other branches of forensic science.
[ { "created": "Tue, 31 Dec 2019 09:45:05 GMT", "version": "v1" }, { "created": "Fri, 12 Jun 2020 12:44:41 GMT", "version": "v2" } ]
2020-06-15
[ [ "Morrison", "Geoffrey Stewart", "" ], [ "Enzinger", "Ewald", "" ], [ "Ramos", "Daniel", "" ], [ "González-Rodríguez", "Joaquín", "" ], [ "Lozano-Díez", "Alicia", "" ] ]
19
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1,225,138
1912.13243
Pavol Bielik
Philippe Schlattner, Pavol Bielik, Martin Vechev
Learning to Infer User Interface Attributes from Images
null
null
null
null
cs.CV cs.GR cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore a new domain of learning to infer user interface attributes that helps developers automate the process of user interface implementation. Concretely, given an input image created by a designer, we learn to infer its implementation which when rendered, looks visually the same as the input image. To achieve this, we take a black box rendering engine and a set of attributes it supports (e.g., colors, border radius, shadow or text properties), use it to generate a suitable synthetic training dataset, and then train specialized neural models to predict each of the attribute values. To improve pixel-level accuracy, we additionally use imitation learning to train a neural policy that refines the predicted attribute values by learning to compute the similarity of the original and rendered images in their attribute space, rather than based on the difference of pixel values. We instantiate our approach to the task of inferring Android Button attribute values and achieve 92.5% accuracy on a dataset consisting of real-world Google Play Store applications.
[ { "created": "Tue, 31 Dec 2019 09:45:59 GMT", "version": "v1" } ]
2020-01-01
[ [ "Schlattner", "Philippe", "" ], [ "Bielik", "Pavol", "" ], [ "Vechev", "Martin", "" ] ]
19
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1,225,139
1912.13244
Anand Awasthi
Pooja Sahlot, Suchita Pandey, Adityanarayan Pandey, and A.M. Awasthi
Harmonic Magneto-dielectric Study in Doped Perovskites, and Double Perovskite
21 pages, 8 figures, 41 references, 1 supplementary information
J. Appl. Phys. 127, 154103 (2020)
10.1063/1.5145383
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fundamental and harmonic magneto-dielectricity studied for varied perovskite systems-- Pb0.98Gd0.02(Mg1/3Nb2/3)0.995O3 (A-site co-doped PGMN magneto-relaxor), La0.95Ca0.05CoO3 (A-site doped spin-state LCCO), and La2NiMnO6 (double-perovskite LNMO multiglass) characterize intricately polarized phases. First-harmonic signal ({\epsilon}2') of magnetically co-doped PGMN manifests finite polarization P(H) below 270K, corroborated by the measured remnant P-E traces. Second-harmonic ({\epsilon}3') reveals the effect of random E-fields causing electrical vitreousity, latter indicated by the divergent timescale of the fundamental response. LCCO features mixed-dipoles phase over appreciable temperature window, affiliated to the coexistent low-spins (LS) and intermediate-spins (IS). Across the 65K-start of IS-to-LS state transition (SST), dc- and ac-conductivities of LCCO exhibit mechanism-changeovers whereas the harmonic susceptibilities evidence IS/LS-interfacial hyper-polarizations. Below the 30K-end of SST, harmonics corroborate the vitreous phase of dipoles in the LS-matrix state. In the LNMO, positive and negative (dual) magneto-dielectricity observed is respectively attributed to the charge-hopping between Ni2+ and Mn4+ ions and the interfacial polarization. Second-harmonic signal here also features dispersion corresponding to the activation energy required for the electron transfer between Ni- and Mn-cations. Results from three different perovskite systems signify the combined importance of first- and second-harmonics, for a detailed understanding of electrical configurations.
[ { "created": "Tue, 31 Dec 2019 09:50:39 GMT", "version": "v1" } ]
2020-04-22
[ [ "Sahlot", "Pooja", "" ], [ "Pandey", "Suchita", "" ], [ "Pandey", "Adityanarayan", "" ], [ "Awasthi", "A. M.", "" ] ]
19
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1,225,140
1912.13245
Ali Zahabi
Ali Zahabi
Thermodynamics of Isoradial Quivers and Hyperbolic 3-Manifolds
30 pages, 2 figures
null
10.1142/S0217751X20501055
null
hep-th math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The BPS sector of $\mathcal{N}=2$, $4d$ toric quiver gauge theories, and its corresponding D6-D2-D0 branes on Calabi-Yau threefolds, have been previously studied using integrable lattice models such as the crystal melting model and the dimer model. The asymptotics of the BPS sector, in the large N limit, can be studied using the Mahler measure theory, \cite{Zah}. In this work, we consider the class of isoradial quivers and study their thermodynamical observables and phase structure. Building on our previous results, and using the relation between the Mahler measure and hyperbolic 3-manifolds, we propose a new approach in the asymptotic analysis of the isoradial quivers. As a result, we obtain the observables such as the BPS free energy, the BPS entropy density and growth rate of the isoradial quivers, as a function of the $R$-charges of the quiver and in terms of the hyperbolic volumes and the dilogarithm functions. The phase structure of the isoradial quivers is studied via the analysis of the BPS entropy density at critical $R$-charges and universal results for the phase structure in this class are obtained. Explicit results for the observables are obtained in some concrete examples of the isoradial quivers.
[ { "created": "Tue, 31 Dec 2019 09:56:06 GMT", "version": "v1" } ]
2020-08-26
[ [ "Zahabi", "Ali", "" ] ]
19
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1,225,141
1912.13246
Malcolm Levitt
Bogdan A. Rodin, Christian Bengs, Lynda J. Brown, Kirill F. Sheberstov, Alexey S. Kiryutin, Richard C. D. Brown, Alexandra V. Yurkovskaya, Konstantin L. Ivanov, Malcolm H. Levitt
Algorithmic Cooling of Nuclear Spin Pairs using a Long-Lived Singlet State
22 pages, 6 figures
null
10.1063/5.0006742
null
quant-ph physics.app-ph physics.chem-ph
http://creativecommons.org/licenses/by/4.0/
Algorithmic cooling methods manipulate an open quantum system in order to lower its temperature below that of the environment. We show that significant cooling is achieved on an ensemble of spin-pair systems by exploiting the long-lived nuclear singlet state, which is an antisymmetric quantum superposition of the "up" and "down" qubit states. The effect is demonstrated by nuclear magnetic resonance (NMR) experiments on a molecular system containing a coupled pair of near-equivalent 13C nuclei. The populations of the system are subjected to a repeating sequence of cyclic permutations separated by relaxation intervals. The long-lived nuclear singlet order is pumped well beyond the unitary limit, and the nuclear magnetization is enhanced by 21% relative to its thermal equilibrium value. To our knowledge this is the first demonstration of algorithmic cooling using a quantum superposition state and without making a distinction between rapidly and slowly relaxing qubits.
[ { "created": "Tue, 31 Dec 2019 09:57:03 GMT", "version": "v1" } ]
2020-05-20
[ [ "Rodin", "Bogdan A.", "" ], [ "Bengs", "Christian", "" ], [ "Brown", "Lynda J.", "" ], [ "Sheberstov", "Kirill F.", "" ], [ "Kiryutin", "Alexey S.", "" ], [ "Brown", "Richard C. D.", "" ], [ "Yurkovskaya", "Alexandra V.", "" ], [ "Ivanov", "Konstantin L.", "" ], [ "Levitt", "Malcolm H.", "" ] ]
19
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1,225,142
1912.13247
Daisuke Kadoh
Daisuke Kadoh and Naoya Ukita
Gradient flow equation in SQCD
7 pages, 37th International Symposium on Lattice Field Theory - Lattice2019
null
null
null
hep-lat hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a supersymmetric gradient flow in ${\cal N}=1$ SQCD in four dimensions. The flow equation is derived in the superfield formalism and is also given for component fields of the Wess-Zumino gauge in a gauge covariant manner. We find that the flow for the component fields is supersymmetric in a sense that the flow time derivative and any supersymmetry transformation commute with each other up to a gauge transformation.
[ { "created": "Tue, 31 Dec 2019 09:57:30 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kadoh", "Daisuke", "" ], [ "Ukita", "Naoya", "" ] ]
19
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1,225,143
1912.13248
Tsiry Randrianasolo
\v{L}ubom\'ir Ba\v{n}as and Giorgio Ferrari and Tsiry A. Randrianasolo
Numerical approximation of the value of a stochastic differential game with asymmetric information
23 pages, 8 figures
SIAM Journal on Control and Optimization, 2021, Vol. 59, No. 2 : pp. 1109-1135
10.1137/19M1309997
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a convexity constrained Hamilton-Jacobi-Bellman-type obstacle problem for the value function of a zero-sum differential game with asymmetric information. We propose a convexity-preserving probabilistic numerical scheme for the approximation of the value function which is discrete w.r.t. the time and convexity variables, and show that the scheme converges to the unique viscosity solution of the considered problem. Furthermore, we generalize the semi-discrete scheme to obtain an implementable fully discrete numerical approximation of the value function and present numerical experiments to demonstrate the properties of the proposed numerical scheme.
[ { "created": "Tue, 31 Dec 2019 10:01:52 GMT", "version": "v1" }, { "created": "Sun, 4 Oct 2020 18:02:02 GMT", "version": "v2" } ]
2021-03-26
[ [ "Baňas", "Ľubomír", "" ], [ "Ferrari", "Giorgio", "" ], [ "Randrianasolo", "Tsiry A.", "" ] ]
19
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1,225,144
1912.13249
Erel Segal-Halevi
Erel Segal-Halevi
Generalized Rental Harmony
Generalized all results to "compensable tenants" - a class that contains both miserly and quasilinear tenants
American Mathematical Monthly, 2022, 403--414
10.1080/00029890.2022.2037988
null
cs.GT econ.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rental Harmony is the problem of assigning rooms in a rented house to tenants with different preferences, and simultaneously splitting the rent among them, such that no tenant envies the bundle (room+price) given to another tenant. Different papers have studied this problem under two incompatible assumptions: the miserly tenants assumption is that each tenant prefers a free room to a non-free room; the quasilinear tenants assumption is that each tenant attributes a monetary value to each room, and prefers a room of which the difference between value and price is maximum. This note shows how to adapt the main technique used for rental harmony with miserly tenants, using Sperner's lemma, to a much more general class of preferences, that contains both miserly and quasilinear tenants as special cases. This implies that some recent results derived for miserly tenants apply to this more general preference class too.
[ { "created": "Tue, 31 Dec 2019 10:01:55 GMT", "version": "v1" }, { "created": "Sat, 29 Feb 2020 23:28:06 GMT", "version": "v2" } ]
2022-06-01
[ [ "Segal-Halevi", "Erel", "" ] ]
19
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1,225,145
1912.13250
Satoshi Ikegaya
S. Ikegaya, K. Yada, Y. Tanaka, S. Kashiwaya, Y. Asano, D. Manske
Identification of Spin-Triplet Superconductivity through a Helical-Chiral Phase Transition in Sr$_2$RuO$_4$ Thin-Films
12 pages, 5 figures
Phys. Rev. B 101, 220501 (2020)
10.1103/PhysRevB.101.220501
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite much effort for over the two decades, the paring symmetry of a Sr$_2$RuO$_4$ superconductor has been still unclear. In this Rapid Communication, motivated by the recent rapid progress in fabrication techniques for Sr$_2$RuO$_4$ thin-films, we propose a promising strategy for identifying the spin-triplet superconductivity in the thin-film geometry by employing an antisymmetric spin-orbit coupling potential and a Zeeman potential due to an external magnetic field. We demonstrate that a spin-triplet superconducting thin-film undergoes a phase transition from a helical state to a chiral state by increasing the applied magnetic field. This phase transition is accompanied by a drastic change in the property of surface Andreev bound states. As a consequence, the helical-chiral phase transition, which is unique to the spin-triplet superconductors, can be detected through a sudden change in a tunneling conductance spectrum of a normal-metal/superconductor junction. Importantly, our proposal is constructed by combining fundamental and rigid concepts regarding physics of spin-triplet superconductivity.
[ { "created": "Tue, 31 Dec 2019 10:03:29 GMT", "version": "v1" } ]
2020-07-01
[ [ "Ikegaya", "S.", "" ], [ "Yada", "K.", "" ], [ "Tanaka", "Y.", "" ], [ "Kashiwaya", "S.", "" ], [ "Asano", "Y.", "" ], [ "Manske", "D.", "" ] ]
19
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1,225,146
1912.13251
Keishu Utimula
Keishu Utimula, Tom Ichibha, Genki I. Prayogo, Kenta Hongo, Kousuke Nakano, Ryo Maezono
Quantum annealing approach to Ionic Diffusion in Solid
null
Sci. Rep. 11 (2021) 7261
10.1038/s41598-021-86274-3
null
quant-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have developed a framework for using quantum annealing computation to evaluate a key quantity in ionic diffusion in solids, the correlation factor. Existing methods can only calculate the correlation factor analytically in the case of physically unrealistic models, making it difficult to relate microstructural information about diffusion path networks obtainable by current ${ab\ initio}$ techniques to macroscopic quantities such as diffusion coefficients. We have mapped the problem into a quantum spin system described by the Ising Hamiltonian. By applying our framework in combination with ab initio technique, it is possible to understand how diffusion coefficients are controlled by temperatures, pressures, atomic substitutions, and other factors.We have calculated the correlation factor in a simple case with a known exact result by a variety of computational methods, including simulated quantum annealing on the spin models, the classical random walk, the matrix description, and quantum annealing on D-Wave with hybrid solver. This comparison shows that all the evaluations give consistent results with each other, but that many of the conventional approaches require infeasible computational costs. Quantum annealing is also currently infeasible because of the cost and scarcity of Q-bits, but we argue that when technological advances alter this situation, quantum annealing will easily outperform all existing methods.
[ { "created": "Tue, 31 Dec 2019 10:06:40 GMT", "version": "v1" }, { "created": "Sun, 19 Jul 2020 14:18:52 GMT", "version": "v2" } ]
2021-04-20
[ [ "Utimula", "Keishu", "" ], [ "Ichibha", "Tom", "" ], [ "Prayogo", "Genki I.", "" ], [ "Hongo", "Kenta", "" ], [ "Nakano", "Kousuke", "" ], [ "Maezono", "Ryo", "" ] ]
19
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1,225,147
1912.13252
Tianwei Zhou
Tianwei Zhou, Ruixiao Yao, Kaixiang Yang, Shengjie Jin, Yueyang Zhai, Xuguang Yue, Shifeng Yang, Xiaoji Zhou, Xuzong Chen, Xiaopeng Li
Dimension Crossing Turbulent Cascade in an Excited Lattice Bose Gas
20 pages, 6 figures
null
null
null
cond-mat.quant-gas physics.atom-ph physics.flu-dyn quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Turbulence is an intriguing non-equilibrium state, which originates from fluid mechanics and has far-reaching consequences in the description of climate physics, the characterization of quantum hydrodynamics, and the understanding of cosmic evolution. The concept of turbulent cascade describing the energy redistribution across different length scales offers one profound route to reconcile fundamental conservative forces with observational energy non-conservation of accelerating expansion of the universe bypassing the cosmological constant. Here, we observe a dimension crossing turbulent energy cascade in an atomic Bose-Einstein condensate confined in a two-dimensional (2d) optical lattice forming a 2d array of tubes, which exhibits universal behaviors in the dynamical energy-redistribution across different dimensions. By exciting atoms into the optical-lattice high bands, the excessive energy of this quantum many-body system is found to cascade from the transverse two-dimensional lattice directions to the continuous dimension, giving rise to a one-dimensional turbulent energy cascade, which is in general challenging to reach due to integrability. We expect this observed novel phenomenon of dimension-crossing energy cascade may inspire microscopic theories for modeling positive cosmological constant of our inflationary universe.
[ { "created": "Tue, 31 Dec 2019 10:08:14 GMT", "version": "v1" }, { "created": "Wed, 8 Jan 2020 23:28:41 GMT", "version": "v2" } ]
2020-01-10
[ [ "Zhou", "Tianwei", "" ], [ "Yao", "Ruixiao", "" ], [ "Yang", "Kaixiang", "" ], [ "Jin", "Shengjie", "" ], [ "Zhai", "Yueyang", "" ], [ "Yue", "Xuguang", "" ], [ "Yang", "Shifeng", "" ], [ "Zhou", "Xiaoji", "" ], [ "Chen", "Xuzong", "" ], [ "Li", "Xiaopeng", "" ] ]
19
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-0.7307667136192322, -0.1756880283355713 ]
1,225,148
1912.13253
Attila Jo\'o
Attila Jo\'o
Proof of Nash-Williams' Intersection Conjecture for countable matroids
null
null
null
null
math.CO
http://creativecommons.org/licenses/by/4.0/
We prove that if $ M $ and $ N $ are finitary matroids on a common countable edge set $ E $ then they admit a common independent set $I $ such that there is a bipartition $ E=E_{M}\cup E_{N} $ for which $ I\cap E_M $ spans $ E_M $ in $ M $ and $ I\cap E_N $ spans $ E_N $ in $ N $. It answers positively the Matroid Intersection Conjecture of Nash-Williams in the countable case.
[ { "created": "Tue, 31 Dec 2019 10:15:01 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2020 15:39:04 GMT", "version": "v2" }, { "created": "Sat, 8 Feb 2020 08:01:54 GMT", "version": "v3" }, { "created": "Mon, 1 Jun 2020 17:05:00 GMT", "version": "v4" }, { "created": "Sun, 10 Jan 2021 10:02:58 GMT", "version": "v5" }, { "created": "Sun, 4 Apr 2021 12:11:52 GMT", "version": "v6" } ]
2021-04-06
[ [ "Joó", "Attila", "" ] ]
19
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1,225,149
1912.13254
Niloufar Nilforoushan
Niloufar Nilforoushan, Michele Casula, Marco Caputo, Evangelos Papalazarou, Jonathan Caillaux, Zhesheng Cheng, Luca Perfetti, Adriano Amaricci, David Santos-Cottin, Yannick Klein, Andrea Gauzzi, and Marino Marsi
Photoinduced renormalization of Dirac states in BaNiS$_2$
null
Phys. Rev. Research 2, 043397 (2020)
10.1103/PhysRevResearch.2.043397
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By means of pump-probe time- and angle-resolved photoelectron spectroscopy, we provide evidence of a sizeable reduction of the Fermi velocity of out-of-equilibrium Dirac bands in the quasi-two-dimensional semimetal BaNiS$_2$. First-principle calculations indicate that this band renormalization is ascribed to a change in non-local electron correlations driven by a photo-induced enhancement of screening properties. This effect is accompanied by a slowing down of the Dirac fermions and by a non-rigid shift of the bands at the center of the Brillouin zone. This result suggests that other similar electronic structure renormalizations may be photoinduced in other materials in presence of strong non-local correlations.
[ { "created": "Tue, 31 Dec 2019 10:18:08 GMT", "version": "v1" } ]
2021-01-04
[ [ "Nilforoushan", "Niloufar", "" ], [ "Casula", "Michele", "" ], [ "Caputo", "Marco", "" ], [ "Papalazarou", "Evangelos", "" ], [ "Caillaux", "Jonathan", "" ], [ "Cheng", "Zhesheng", "" ], [ "Perfetti", "Luca", "" ], [ "Amaricci", "Adriano", "" ], [ "Santos-Cottin", "David", "" ], [ "Klein", "Yannick", "" ], [ "Gauzzi", "Andrea", "" ], [ "Marsi", "Marino", "" ] ]
19
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1,225,150
1912.13255
Arnab Acharya Mr.
Arnab Acharya, Debapriya Pal, Soumitro Banerjee and Ananda Dasgupta
Limiting distribution of periodic position measurements of a quantum harmonic oscillator
null
Volume 384, Issue 18, 26 June 2020, 126397
10.1016/j.physleta.2020.126397
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a particle in harmonic oscillator potential, whose position is periodically measured with an instrument of finite precision. We show that the distribution of the measured positions tends to a limiting distribution when the number of measurements tends to infinity. We derive the expression for the limiting position distribution and validate it with numerical simulation.
[ { "created": "Tue, 31 Dec 2019 10:23:24 GMT", "version": "v1" }, { "created": "Tue, 7 Jan 2020 05:46:39 GMT", "version": "v2" }, { "created": "Fri, 15 Jan 2021 06:38:26 GMT", "version": "v3" } ]
2021-01-18
[ [ "Acharya", "Arnab", "" ], [ "Pal", "Debapriya", "" ], [ "Banerjee", "Soumitro", "" ], [ "Dasgupta", "Ananda", "" ] ]
19
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1,225,151
1912.13256
Lanfei Wang
Lanfei Wang and Lingxi Xie and Tianyi Zhang and Jun Guo and Qi Tian
Scalable NAS with Factorizable Architectural Parameters
10 pages, 4 figures
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null
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cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neural Architecture Search (NAS) is an emerging topic in machine learning and computer vision. The fundamental ideology of NAS is using an automatic mechanism to replace manual designs for exploring powerful network architectures. One of the key factors of NAS is to scale-up the search space, e.g., increasing the number of operators, so that more possibilities are covered, but existing search algorithms often get lost in a large number of operators. For avoiding huge computing and competition among similar operators in the same pool, this paper presents a scalable algorithm by factorizing a large set of candidate operators into smaller subspaces. As a practical example, this allows us to search for effective activation functions along with the regular operators including convolution, pooling, skip-connect, etc. With a small increase in search costs and no extra costs in re-training, we find interesting architectures that were not explored before, and achieve state-of-the-art performance on CIFAR10 and ImageNet, two standard image classification benchmarks.
[ { "created": "Tue, 31 Dec 2019 10:26:56 GMT", "version": "v1" }, { "created": "Tue, 22 Sep 2020 18:47:42 GMT", "version": "v2" } ]
2020-09-24
[ [ "Wang", "Lanfei", "" ], [ "Xie", "Lingxi", "" ], [ "Zhang", "Tianyi", "" ], [ "Guo", "Jun", "" ], [ "Tian", "Qi", "" ] ]
19
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1,225,152
1912.13257
Andreas Sinner
Andreas Sinner, Yurii E. Lozovik, and Klaus Ziegler
Pairing transition in a double layer with interlayer Coulomb repulsion
null
Phys. Rev. Research 2, 033085 (2020)
10.1103/PhysRevResearch.2.033085
null
cond-mat.supr-con cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of interlayer Coulomb interaction in an electronic double layer. Assuming that each of the layers consists of a bipartite lattice, a sufficiently strong interlayer interaction leads to an interlayer pairing of electrons with a staggered order parameter. We show that the correlated pairing state is dual to the excitonic pairing state with uniform order parameter in an electron-hole double layer. The interlayer pairing of electrons leads to strong current-current correlations between the layers. We also analyze the interlayer conductivity and the fluctuations of the order parameter, which consists of a gapped and a gapless mode.
[ { "created": "Tue, 31 Dec 2019 10:31:20 GMT", "version": "v1" }, { "created": "Fri, 26 Jun 2020 11:15:47 GMT", "version": "v2" }, { "created": "Tue, 21 Jul 2020 09:21:19 GMT", "version": "v3" } ]
2020-07-22
[ [ "Sinner", "Andreas", "" ], [ "Lozovik", "Yurii E.", "" ], [ "Ziegler", "Klaus", "" ] ]
19
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1,225,153
1912.13258
Yiqiang Han
Yuan Gao, Yiqiang Han
Automated Testing for Deep Learning Systems with Differential Behavior Criteria
8 pages, 9 figures
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we conducted a study on building an automated testing system for deep learning systems based on differential behavior criteria. The automated testing goals were achieved by jointly optimizing two objective functions: maximizing differential behaviors from models under testing and maximizing neuron coverage. By observing differential behaviors from three pre-trained models during each testing iteration, the input image that triggered erroneous feedback was registered as a corner-case. The generated corner-cases can be used to examine the robustness of DNNs and consequently improve model accuracy. A project called DeepXplore was also used as a baseline model. After we fully implemented and optimized the baseline system, we explored its application as an augmenting training dataset with newly generated corner cases. With the GTRSB dataset, by retraining the model based on automated generated corner cases, the accuracy of three generic models increased by 259.2%, 53.6%, and 58.3%, respectively. Further, to extend the capability of automated testing, we explored other approaches based on differential behavior criteria to generate photo-realistic images for deep learning systems. One approach was to apply various transformations to the seed images for the deep learning framework. The other approach was to utilize the Generative Adversarial Networks (GAN) technique, which was implemented on MNIST and Driving datasets. The style transferring capability has been observed very effective in adding additional visual effects, replacing image elements, and style-shifting (virtual image to real images). The GAN-based testing sample generation system was shown to be the next frontier for automated testing for deep learning systems.
[ { "created": "Tue, 31 Dec 2019 10:31:55 GMT", "version": "v1" } ]
2020-01-01
[ [ "Gao", "Yuan", "" ], [ "Han", "Yiqiang", "" ] ]
19
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1,225,154
1912.13259
Carlo Marinelli
Carlo Marinelli, Luca Scarpa
On the positivity of local mild solutions to stochastic evolution equations
10 pages, no figures
null
null
null
math.AP math.PR q-fin.MF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide sufficient conditions on the coefficients of a stochastic evolution equation on a Hilbert space of functions driven by a cylindrical Wiener process ensuring that its mild solution is positive if the initial datum is positive. As an application, we discuss the positivity of forward rates in the Heath-Jarrow-Morton model via Musiela's stochastic PDE.
[ { "created": "Tue, 31 Dec 2019 10:34:58 GMT", "version": "v1" } ]
2020-01-01
[ [ "Marinelli", "Carlo", "" ], [ "Scarpa", "Luca", "" ] ]
19
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1,225,155
1912.13260
Tomoshige Yukita
Tomoshige Yukita
Locally rigid right-angled Coxeter groups with Fuchsian ends in dimension 5
null
null
null
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we construct a right-angled 5-polytope P of finite volume such that all the right-angled Coxeter groups with Fuchsian ends obtained from P are locally rigid.
[ { "created": "Tue, 31 Dec 2019 10:40:58 GMT", "version": "v1" }, { "created": "Wed, 1 Jan 2020 02:54:56 GMT", "version": "v2" } ]
2020-01-03
[ [ "Yukita", "Tomoshige", "" ] ]
19
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1,225,156
1912.13261
Yan Li
Haigang Li and Yan Li
An extended Flaherty-Keller formula for an elastic composite with densely packed convex inclusions
26 pages, 5 figures
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we are concerned with the effective elastic property of a two-phase high-contrast periodic composite with densely packed inclusions. The equations of linear elasticity are assumed. We first give a novel proof of the Flaherty-Keller formula for elliptic inclusions, which improves a recent result of Kang and Yu (Calc.Var.Partial Differential Equations, 2020). We construct an auxiliary function consisting of the Keller function and an additional corrected function depending on the coefficients of Lam\'e system and the geometry of inclusions, to capture the full singular term of the gradient. On the other hand, this method allows us to deal with the inclusions of arbitrary shape, even with zero curvature. An extended Flaherty-Keller formula is proved for m-convex inclusions, m > 2, curvilinear squares with round off angles, which minimize the elastic modulus under the same volume fraction of hard inclusions.
[ { "created": "Tue, 31 Dec 2019 10:44:23 GMT", "version": "v1" }, { "created": "Wed, 29 Apr 2020 05:22:27 GMT", "version": "v2" } ]
2020-04-30
[ [ "Li", "Haigang", "" ], [ "Li", "Yan", "" ] ]
19
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1,225,157
1912.13262
Andrew Adamatzky
Andrew Adamatzky, Phil Ayres, Gianluca Belotti, Han Wosten
Fungal architecture
The position paper to be published in the International Journal of Unconventional Computing
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cs.ET
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As one of the primary consumers of environmental resource, the building industry faces unprecedented challenges in needing to reduce the environmental impact of current consumption practices. This applies to both the construction of the built environment and resource consumption during its occupation and use. Where incremental improvements to current practices can be realised, the net benefits are often far outstripped by the burgeoning demands of rapidly increasing population growth and urbanisation. Against the backdrop of this grand societal challenge, it is necessary to explore approaches that envision a paradigm shift in how material is sourced, processed and assembled to address the magnitude of these challenges in a truly sustainable way, and which can even provide added value. We propose to develop a structural substrate by using live fungal mycelium, functionalise the substrate with nanoparticles and polymers to make a mycelium-based electronics, implement sensorial fusion and decision making in the fungal electronics and to growing monolithic buildings from the functionalised fungal substrate. Fungal buildings will self-grow, build, and repair themselves subject to substrate supplied, use natural adaptation to the environment, sense all what human can sense.
[ { "created": "Tue, 31 Dec 2019 10:54:58 GMT", "version": "v1" } ]
2020-01-01
[ [ "Adamatzky", "Andrew", "" ], [ "Ayres", "Phil", "" ], [ "Belotti", "Gianluca", "" ], [ "Wosten", "Han", "" ] ]
19
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1,225,158
1912.13263
Gianluca Baldassarre PhD
Gianluca Baldassarre
Intrinsic motivations and open-ended learning
24 pages, 2 figures, 2 tables, preprint
null
null
null
cs.AI cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There is a growing interest and literature on intrinsic motivations and open-ended learning in both cognitive robotics and machine learning on one side, and in psychology and neuroscience on the other. This paper aims to review some relevant contributions from the two literature threads and to draw links between them. To this purpose, the paper starts by defining intrinsic motivations and by presenting a computationally-driven theoretical taxonomy of their different types. Then it presents relevant contributions from the psychological and neuroscientific literature related to intrinsic motivations, interpreting them based on the grid, and elucidates the mechanisms and functions they play in animals and humans. Endowed with such concepts and their biological underpinnings, the paper next presents a selection of models from cognitive robotics and machine learning that computationally operationalise the concepts of intrinsic motivations and links them to biology concepts. The contribution finally presents some of the open challenges of the field from both the psychological/neuroscientific and computational perspectives.
[ { "created": "Tue, 31 Dec 2019 10:56:02 GMT", "version": "v1" } ]
2020-01-01
[ [ "Baldassarre", "Gianluca", "" ] ]
19
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1,225,159
1912.13264
Lukas Schimmer
Lukas Schimmer
Improved sharp spectral inequalities for Schr\"odinger operators on the semi-axis
14 pages; revised and final version with additional Section 4.2; to appear in J. Spectr. Theory
null
null
null
math.SP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a Lieb--Thirring inequality for Schr\"odinger operators $-\frac{\mathrm{d}^2}{\mathrm{d}x^2}+V$ on the semi-axis with Robin boundary condition at the origin. The result improves on a bound obtained by P.~Exner, A.~Laptev and M.~Usman [Commun.~Math.~Phys. 362(2), 531--541 (2014)] albeit under the additional assumption $V\in L^1(\mathbb{R}_+)$. The main difference in our proof is that we use the double commutation method in place of the single commutation method. We also establish an improved inequality in the case of a Dirichlet boundary condition.
[ { "created": "Tue, 31 Dec 2019 11:02:40 GMT", "version": "v1" }, { "created": "Sat, 28 May 2022 19:13:42 GMT", "version": "v2" } ]
2022-05-31
[ [ "Schimmer", "Lukas", "" ] ]
19
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1,225,160
1912.13265
Marek Ptak
M. Cristina C\^amara, Kamila Kli\'s--Garlicka, Bartosz {\L}anucha, and Marek Ptak
Conjugations in $L^2$ and their invariants
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math.FA math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Conjugations in space $L^2$ of the unit circle commuting with multiplication by $z$ or intertwining multiplications by $z$ and $\bar z$ are characterized. We also study their behaviour with respect to the Hardy space, subspaces invariant for the unilateral shift and model spaces.
[ { "created": "Tue, 31 Dec 2019 11:04:39 GMT", "version": "v1" } ]
2020-01-01
[ [ "Câmara", "M. Cristina", "" ], [ "Kliś--Garlicka", "Kamila", "" ], [ "Łanucha", "Bartosz", "" ], [ "Ptak", "Marek", "" ] ]
19
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1,225,161
1912.13266
Kamila Kli\'s-Garlicka
M. Cristina C\^amara, Kamila Kli\'s-Garlicka, Bartosz {\L}anucha and Marek Ptak
Invertibility, Fredholmness and kernels of dual truncated Toeplitz operators
null
null
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Asymmetric dual truncated Toeplitz operators acting between the orthogonal complements of two (eventually different) model spaces are introduced and studied. They are shown to be equivalent after extension to paired operators on $L^2(\mathbb T) \oplus L^2(\mathbb T)$ and, if their symbols are invertible in $L^\infty(\mathbb T)$, to asymmetric truncated Toeplitz operators with the inverse symbol. Relations with Carleson's corona theorem are also established. These results are used to study the Fredholmness, the invertibility and the spectra of various classes of dual truncated Toeplitz operators.
[ { "created": "Tue, 31 Dec 2019 11:06:22 GMT", "version": "v1" } ]
2020-01-01
[ [ "Câmara", "M. Cristina", "" ], [ "Kliś-Garlicka", "Kamila", "" ], [ "Łanucha", "Bartosz", "" ], [ "Ptak", "Marek", "" ] ]
19
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1,225,162
1912.13267
Manuel Rivera
Manuel Rivera and Zhengfang Wang
Invariance of the Goresky-Hingston algebra on reduced Hochschild homology
Final version to appear in the Proceedings of the London Mathematical Society. The presentation and exposition were improved following the suggestions of an anonymous referee. In particular, we have added an outline of the proof of our main result in the introduction
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math.AT math.QA math.RA math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that two quasi-isomorphic simply connected differential graded associative Frobenius algebras have isomorphic Goresky-Hingston algebras on their reduced Hochschild homology. Our proof is based on relating the Goresky-Hingston algebra on reduced Hochschild homology to the singular Hochschild cohomology algebra. For any simply connected oriented closed manifold $M$ of dimension $k$, the Goresky-Hingston algebra on reduced Hochschild homology induces an algebra structure of degree $k-1$ on $\bar{H}^*(LM;\mathbb{Q})$, the reduced rational cohomology of the free loop space of $M$. As a consequence of our algebraic result, we deduce that the isomorphism class of the induced algebra structure on $\bar{H}^*(LM;\mathbb{Q})$ is an invariant of the homotopy type of $M$.
[ { "created": "Tue, 31 Dec 2019 11:07:27 GMT", "version": "v1" }, { "created": "Wed, 1 Jan 2020 12:16:01 GMT", "version": "v2" }, { "created": "Mon, 13 Jan 2020 15:18:28 GMT", "version": "v3" }, { "created": "Thu, 24 Dec 2020 00:53:03 GMT", "version": "v4" }, { "created": "Wed, 5 Jan 2022 22:29:31 GMT", "version": "v5" } ]
2022-01-07
[ [ "Rivera", "Manuel", "" ], [ "Wang", "Zhengfang", "" ] ]
19
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1,225,163
1912.13268
Michael Semenov-Tian-Shansky
Michael Semenov-Tian-Shansky
Quantum Toda Lattice: a Challenge for Representation Theory
27 pages
null
null
null
math.RT math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum Toda lattice may solved by means of the Representation Theory of semisimple Lie groups, or alternatively by using the technique of the Quantum Inverse Scattering Method. A comparison of the two approaches, which is the purpose of the present review article, sheds a new light on Representation Theory and leads to a number of challenging questions.
[ { "created": "Tue, 31 Dec 2019 11:08:30 GMT", "version": "v1" } ]
2020-01-01
[ [ "Semenov-Tian-Shansky", "Michael", "" ] ]
19
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1,225,164
1912.13269
Arghya Das
Arghya Das, Abhishek Dhar and Anupam Kundu
Gap statistics of two interacting run and tumble particles in one dimension
29 pages, 9 figures
null
10.1088/1751-8121/ab9cf3
null
cond-mat.stat-mech cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the dynamics of the separation (gap) between a pair of interacting run and tumble particles (RTPs) moving in one dimension in the presence of additional thermal noise. On a ring geometry the distribution of the gap approaches a steady state. We analytically compute this distribution and find that this is exponentially localised in space, in contrast to the `jammed' configuration, seen earlier in the absence of thermal noise. We also study the relaxation which is an exponential, characterised by a time scale $\tau_r$. We observe that this time scale undergoes a crossover from a size independent value to a size dependent form with increasing size $l$ of the ring. We study the full eigenvalue spectrum of the evolution operator $\mathcal{L}$ and find that the spectrum can be classified into four sectors depending on the symmetries of $\mathcal{L}$. For large $l$, we find explicit expressions for the low lying eigenvalues in each of the sectors. On infinite line the separation does not reach a steady state. In the long times we find that the particles behave as interacting Brownian particles, except for the presence of a peak in the distribution at small separation which is a remnant of activity.
[ { "created": "Tue, 31 Dec 2019 11:08:36 GMT", "version": "v1" }, { "created": "Fri, 31 Jan 2020 07:24:41 GMT", "version": "v2" } ]
2020-08-26
[ [ "Das", "Arghya", "" ], [ "Dhar", "Abhishek", "" ], [ "Kundu", "Anupam", "" ] ]
19
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1,225,165
1912.13270
Marek Ptak
M. Cristina C\^amara, Kamila Kli\'s--Garlicka, Bartosz {\L}anucha, and Marek Ptak
Conjugations in $L^2(\mathcal{H})$
null
null
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Conjugations commuting with $\mathbf{M}_z$ and intertwining $\mathbf{M}_z$ and $\mathbf{M}_{\bar z}$ in $L^2(\mathcal{H})$, where $\mathcal{H}$ is a Hilbert space, are characterized. We also investigate which of them leave invariant the whole Hardy space $H^2(\mathcal{H})$ or a model space $K_{\Theta}=H^2(\mathcal{H})\ominus\Theta H^2(\mathcal{H})$, where $\Theta$ is a pure operator valued inner function.
[ { "created": "Tue, 31 Dec 2019 11:13:56 GMT", "version": "v1" } ]
2020-01-01
[ [ "Câmara", "M. Cristina", "" ], [ "Kliś--Garlicka", "Kamila", "" ], [ "Łanucha", "Bartosz", "" ], [ "Ptak", "Marek", "" ] ]
19
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1,225,166
1912.13271
Francisco Dominguez-Adame
Miguel A. Sierra, David Sanchez, Rafael Gutierrez, Gianaurelio Cuniberti, Francisco Dominguez-Adame and Elena Diaz
Spin-polarized electron transmission in DNA-like systems
null
Biomolecules 10, 49 (2020)
10.3390/biom10010049
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The helical distribution of the electronic density in chiral molecules, such as DNA and bacteriorhodopsin, has been suggested to induce a spin-orbit coupling interaction that may lead to the so-called chirality-induced spin selectivity (CISS) effect. Key ingredients for the theoretical modelling are, in this context, the helically shaped potential of the molecule and, concomitantly, a Rashba-like spin-orbit coupling due to the appearance of a magnetic field in the electron reference frame. Symmetries of these models clearly play a crucial role in explaining the observed effect, but a thorough analysis has been largely ignored in the literature. In this work, we present a study of these symmetries and how they can be exploited to enhance chiral-induced spin selectivity in helical molecular systems.
[ { "created": "Tue, 31 Dec 2019 11:22:07 GMT", "version": "v1" } ]
2020-01-01
[ [ "Sierra", "Miguel A.", "" ], [ "Sanchez", "David", "" ], [ "Gutierrez", "Rafael", "" ], [ "Cuniberti", "Gianaurelio", "" ], [ "Dominguez-Adame", "Francisco", "" ], [ "Diaz", "Elena", "" ] ]
19
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1,225,167
1912.13272
Alexander Teretenkov
A.E. Teretenkov
Exact non-Markovian evolution with multiple reservoirs
null
Phys. Part. Nuclei 51, 479-484 (2020)
10.1134/S1063779620040711
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The model of a multi-level system interacting with several reservoirs is considered. The exact reduced density matrix evolution could be obtained for this model without Markov approximation. Namely, this evolution is fully defined by the finite set of linear differential equations. In this work the results which were obtained previously for only one Lorentz peak in the spectral density are generalized to the case of an arbitrary number of such peaks. The case of the Ohmic contribution in the spectral density is also taken here into account.
[ { "created": "Tue, 31 Dec 2019 11:22:20 GMT", "version": "v1" } ]
2020-09-22
[ [ "Teretenkov", "A. E.", "" ] ]
19
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1,225,168
1912.13273
Albrecht Kurze
Albrecht Kurze, Arne Berger, Teresa Denefleh
From Ideation to Implications: Directions for the Internet of Things in the Home
Proceedings of the CHI 2019 Workshop on New Directions for the IoT: Automate, Share, Build, and Care, (arXiv:1906.06089)
null
null
IOTD/2019/05
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we give a brief overview of our approaches and ongoing work for future directions of the Internet of Things (IoT) with a focus on the IoT in the home. We highlight some of our activities including tools and methods for an ideation-driven approach as well as for an implications-driven approach. We point to some findings of workshops and empirical field-studies. We show examples for new classes of idiosyncratic IoT devices, how implications emerge by (mis)using sensor data and how users interacted with IoT systems in shared spaces.
[ { "created": "Tue, 31 Dec 2019 11:30:04 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kurze", "Albrecht", "" ], [ "Berger", "Arne", "" ], [ "Denefleh", "Teresa", "" ] ]
19
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1,225,169
1912.13274
Naoya Iwahara
Zhishuo Huang, Dan Liu, Akseli Mansikkam\"aki, Veacheslav Vieru, Naoya Iwahara, and Liviu F. Chibotaru
Ferromagnetic kinetic exchange interaction in magnetic insulators
Main text: 13 pages, 8 figures
Phys. Rev. Research 2, 033430 (2020)
10.1103/PhysRevResearch.2.033430
Phys. Rev. Research 2, 033430 (2020)
cond-mat.str-el cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The superexchange theory predicts dominant antiferromagnetic kinetic interaction when the orbitals accommodating magnetic electrons are covalently bonded through diamagnetic bridging atoms/groups. Here we show that explicit consideration of magnetic and (leading) bridging orbitals, together with the electron transfer between the former, reveals a strong ferromagnetic kinetic exchange contribution. First principle calculations show that it is comparable in strength with antiferromagnetic superexchange in a number of magnetic materials with diamagnetic metal bridges. In particular, it is responsible for a very large ferromagnetic coupling ($-10$ meV) between the iron ions in a Fe$^{3+}$-Co$^{3+}$-Fe$^{3+}$ complex.
[ { "created": "Tue, 31 Dec 2019 11:35:15 GMT", "version": "v1" }, { "created": "Mon, 30 Mar 2020 06:17:49 GMT", "version": "v2" }, { "created": "Mon, 31 Aug 2020 14:28:43 GMT", "version": "v3" } ]
2020-09-23
[ [ "Huang", "Zhishuo", "" ], [ "Liu", "Dan", "" ], [ "Mansikkamäki", "Akseli", "" ], [ "Vieru", "Veacheslav", "" ], [ "Iwahara", "Naoya", "" ], [ "Chibotaru", "Liviu F.", "" ] ]
19
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1,225,170
1912.13275
Valentina Macchiati
V. Macchiati, G. Brandi, G. Cimini, G. Caldarelli, D. Paolotti, T. Di Matteo
Systemic liquidity contagion in the European interbank market
32 pages, 24 figures Submitted to Journal of Economic Interaction and Coordination
Journal of Economic Interaction and Coordination (2021)
10.1007/s11403-021-00338-1
null
q-fin.RM physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Systemic liquidity risk, defined by the IMF as "the risk of simultaneous liquidity difficulties at multiple financial institutions", is a key topic in macroprudential policy and financial stress analysis. Specialized models to simulate funding liquidity risk and contagion are available but they require not only banks' bilateral exposures data but also balance sheet data with sufficient granularity, which are hardly available. Alternatively, risk analyses on interbank networks have been done via centrality measures of the underlying graph capturing the most interconnected and hence more prone to risk spreading banks. In this paper, we propose a model which relies on an epidemic model which simulate a contagion on the interbank market using the funding liquidity shortage mechanism as contagion process. The model is enriched with country and bank risk features which take into account the heterogeneity of the interbank market. The proposed model is particularly useful when full set of data necessary to run specialized models is not available. Since the interbank network is not fully available, an economic driven reconstruction method is also proposed to retrieve the interbank network by constraining the standard reconstruction methodology to real financial indicators. We show that the contagion model is able to reproduce systemic liquidity risk across different years and countries. This result suggests that the proposed model can be successfully used as a valid alternative to more complex ones.
[ { "created": "Tue, 31 Dec 2019 11:42:34 GMT", "version": "v1" }, { "created": "Thu, 17 Sep 2020 15:30:20 GMT", "version": "v2" } ]
2021-12-08
[ [ "Macchiati", "V.", "" ], [ "Brandi", "G.", "" ], [ "Cimini", "G.", "" ], [ "Caldarelli", "G.", "" ], [ "Paolotti", "D.", "" ], [ "Di Matteo", "T.", "" ] ]
19
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1,225,171
1912.13276
Shervin Rahimzadeh Arashloo
Shervin Rahimzadeh Arashloo
Unseen Face Presentation Attack Detection Using Class-Specific Sparse One-Class Multiple Kernel Fusion Regression
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper addresses face presentation attack detection in the challenging conditions of an unseen attack scenario where the system is exposed to novel presentation attacks that were not present in the training step. For this purpose, a pure one-class face presentation attack detection approach based on kernel regression is developed which only utilises bona fide (genuine) samples for training. In the context of the proposed approach, a number of innovations, including multiple kernel fusion, client-specific modelling, sparse regularisation and probabilistic modelling of score distributions are introduced to improve the efficacy of the method. The results of experimental evaluations conducted on the OULU-NPU, Replay-Mobile, Replay-Attack and MSU-MFSD datasets illustrate that the proposed method compares very favourably with other methods operating in an unseen attack detection scenario while achieving very competitive performance to multi-class methods (benefiting from presentation attack data for training) despite using only bona fide samples for training.
[ { "created": "Tue, 31 Dec 2019 11:53:20 GMT", "version": "v1" } ]
2020-01-01
[ [ "Arashloo", "Shervin Rahimzadeh", "" ] ]
19
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1,225,172
1912.13277
Julia Bernatska
Julia Bernatska, Yaacov Kopeliovich
Addition of Divisors on Hyperelliptic Curves via Interpolation Polynomials
null
SIGMA 16 (2020), 053, 21 pages
10.3842/SIGMA.2020.053
null
math.AG math.CO math.NT
http://creativecommons.org/licenses/by-sa/4.0/
Two problems are addressed: reduction of an arbitrary degree non-special divisor to the equivalent divisor of the degree equal to genus of a curve, and addition of divisors of arbitrary degrees. The hyperelliptic case is considered as the simplest model. Explicit formulas defining reduced divisors for some particular cases are found. The reduced divisors are obtained in the form of solution of the Jacobi inversion problem which provides the way of computing Abelian functions on arbitrary non-special divisors. An effective reduction algorithm is proposed, which has the advantage that it involves only arithmetic operations on polynomials. The proposed addition algorithm contains more details comparing with the known in cryptography, and is extended to divisors of arbitrary degrees comparing with the known in the theory of hyperelliptic functions.
[ { "created": "Tue, 31 Dec 2019 12:02:07 GMT", "version": "v1" }, { "created": "Thu, 2 Jan 2020 07:17:33 GMT", "version": "v2" }, { "created": "Wed, 12 Feb 2020 18:27:40 GMT", "version": "v3" }, { "created": "Sun, 12 Apr 2020 21:14:01 GMT", "version": "v4" }, { "created": "Sun, 14 Jun 2020 07:47:01 GMT", "version": "v5" } ]
2020-06-16
[ [ "Bernatska", "Julia", "" ], [ "Kopeliovich", "Yaacov", "" ] ]
19
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1,225,173
1912.13278
Shixuan Zhang
Shixuan Zhang, Xu Andy Sun
Stochastic Dual Dynamic Programming for Multistage Stochastic Mixed-Integer Nonlinear Optimization
null
null
null
null
math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study multistage stochastic mixed-integer nonlinear programs (MS-MINLP). This general class of problems encompasses, as important special cases, multistage stochastic convex optimization with non-Lipschitzian value functions and multistage stochastic mixed-integer linear optimization. We develop stochastic dual dynamic programming (SDDP) type algorithms with nested decomposition, deterministic sampling, and stochastic sampling. The key ingredient is a new type of cuts based on generalized conjugacy. Several interesting classes of MS-MINLP are identified, where the new algorithms are guaranteed to obtain the global optimum without the assumption of complete recourse. This significantly generalizes the classic SDDP algorithms. We also characterize the iteration complexity of the proposed algorithms. In particular, for a $(T+1)$-stage stochastic MINLP with $d$-dimensional state spaces, to obtain an $\epsilon$-optimal root node solution, we prove that the number of iterations of the proposed deterministic sampling algorithm is upper bounded by $\mathcal{O}((\frac{2T}{\epsilon})^d)$, and is lower bounded by $\mathcal{O}((\frac{T}{4\epsilon})^d)$ for the general case or by $\mathcal{O}((\frac{T}{8\epsilon})^{d/2-1})$ for the convex case. This shows that the obtained complexity bounds are rather sharp. It also reveals that the iteration complexity depends polynomially on the number of stages. We further show that the iteration complexity depends linearly on $T$, if all the state spaces are finite sets, or if we seek a $(T\epsilon)$-optimal solution when the state spaces are infinite sets, i.e. allowing the optimality gap to scale with $T$. To the best of our knowledge, this is the first work that reports global optimization algorithms as well as iteration complexity results for solving such a large class of multistage stochastic programs.
[ { "created": "Tue, 31 Dec 2019 12:04:32 GMT", "version": "v1" }, { "created": "Sun, 5 Jan 2020 04:01:06 GMT", "version": "v2" }, { "created": "Tue, 12 Jan 2021 02:41:30 GMT", "version": "v3" }, { "created": "Thu, 11 Nov 2021 03:52:56 GMT", "version": "v4" }, { "created": "Fri, 20 May 2022 17:33:50 GMT", "version": "v5" } ]
2022-05-23
[ [ "Zhang", "Shixuan", "" ], [ "Sun", "Xu Andy", "" ] ]
19
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1,225,174
1912.13279
Vasilis Chousionis
Vasileios Chousionis, Sean Li, Scott Zimmerman
Singular integrals on $C^{1,\alpha}$ regular curves in Carnot groups
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null
math.CA math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\mathbb{G}$ be any Carnot group. We prove that if a convolution type singular integral associated with a $1$-dimensional Calder\'on-Zygmund kernel is $L^2$-bounded on horizontal lines, with uniform bounds, then it is bounded in $L^p, p \in (1,\infty),$ on any compact $C^{1,\alpha}, \alpha \in (0,1],$ regular curve in $\mathbb{G}$.
[ { "created": "Tue, 31 Dec 2019 12:07:13 GMT", "version": "v1" }, { "created": "Fri, 3 Jan 2020 03:23:01 GMT", "version": "v2" } ]
2020-01-06
[ [ "Chousionis", "Vasileios", "" ], [ "Li", "Sean", "" ], [ "Zimmerman", "Scott", "" ] ]
19
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1,225,175
1912.13280
Jan Honolka
Jan Fik\'a\v{c}ek, Vitalii Stetsovych, Martin Vondr\'a\v{c}ek, Pavel Proch\'azka, Stanislav Pr\r{u}\v{s}a, Lukas Kormo\v{s}, Jan \v{C}echal, Ondrej Caha, Tom\'a\v{s} Sk\'ala, Petru Vlaic, Karel Carva, Gunther Springholz, Jan Honolka
Step-edge assisted large scale FeSe monolayer growth on epitaxial Bi2Se3 thin films
11 pages, 8 figures
null
10.1088/1367-2630/ab9b59
null
cond-mat.mtrl-sci cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The interest in Fe-chalcogenide unconventional superconductors is intense after the critical temperature of FeSe was reported enhanced by more than one order of magnitude in the monolayer limit at the interface to an insulating oxide substrate. In heterostructures comprising interfaces of FeSe with topological insulators, additional interesting physical phenomena is predicted to arise e.g. in form of {\it topological superconductivity}. So far superconductive properties of Fe-chalcogenide monolayers were mostly studied by local scanning tunneling spectroscopy experiments, which can detect pseudo-gaps in the density of states as an indicator for Cooper pairing. Direct macroscopic transport properties which can prove or falsify a superconducting phase were rarely reported due to the difficulty to grow films with homogeneous material properties. Here we report on a promising growth method to fabricate continuous carpets of monolayer thick FeSe on molecular beam epitaxy grown Bi$_2$Se$_3$ topological insulator thin films. In contrast to previous works using atomically flat cleaved bulk Bi$_2$Se$_3$ crystal surfaces we observe a strong influence of the high step-edge density (terrace width about 10~nm) on MBE-grown Bi$_2$Se$_3$ substrates, which significantly promotes the growth of coalescing FeSe domains with small tetragonal crystal distortion without compromising the underlying Bi$_2$Se$_3$ crystal structure.
[ { "created": "Tue, 31 Dec 2019 12:07:56 GMT", "version": "v1" } ]
2020-08-26
[ [ "Fikáček", "Jan", "" ], [ "Stetsovych", "Vitalii", "" ], [ "Vondráček", "Martin", "" ], [ "Procházka", "Pavel", "" ], [ "Průša", "Stanislav", "" ], [ "Kormoš", "Lukas", "" ], [ "Čechal", "Jan", "" ], [ "Caha", "Ondrej", "" ], [ "Skála", "Tomáš", "" ], [ "Vlaic", "Petru", "" ], [ "Carva", "Karel", "" ], [ "Springholz", "Gunther", "" ], [ "Honolka", "Jan", "" ] ]
19
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1,225,176
1912.13281
Paolo Molaro
Paolo Molaro, Luca Izzo, Piercarlo Bonifacio, Margarita Hernanz, Pierluigi Selvelli, Massimo Della Valle
Search for 7Be in the outburst of four recent novae
13 pages, 12 figures, accepted MNRAS
null
10.1093/mnras/stz3587
null
astro-ph.GA astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Following the recent detection of 7Be in the outburst spectra of Classical Novae we report the search for this isotope in the outbursts of four recent bright novae by means of high resolution UVES observations. The 7BeII 313.0583, 313.1228 nm doublet resonance lines are detected in the high velocity components of Nova Mus 2018 and ASASSN-18fv during outburst. On the other hand 7BeII is neither detected in ASASSN-17hx and possibly nor in Nova Cir 2018, therefore showing that the 7BeII is not always ejected in the thermonuclear runaway. Taking into account the 7Be decay we find X(7Be)/X(H) approx 1.5 x10 ^{-5} and 2.2 x 10 ^{-5} in Nova Mus 2018 and ASASSN-18fv, respectively. A value of 7Be/H about 2 x10 ^{-5} is found in 5 out of the 7 extant measurements and it might be considered as a typical 7Be yield for novae. However, this value is almost one order of magnitude larger than predicted by current theoretical models. We argue that the variety of high 7Be/H abundances could be originated in a higher than solar content of 3He in the donor star. The cases with 7Be not detected might be related to a small mass of the WD or to relatively little mixing with the core material of the WD. The 7Be /H, or 7Li/H, abundance is about 4 dex above meteoritic thus confirming the novae as the main sources of 7Li in the Milky Way.
[ { "created": "Tue, 31 Dec 2019 12:09:21 GMT", "version": "v1" } ]
2020-02-12
[ [ "Molaro", "Paolo", "" ], [ "Izzo", "Luca", "" ], [ "Bonifacio", "Piercarlo", "" ], [ "Hernanz", "Margarita", "" ], [ "Selvelli", "Pierluigi", "" ], [ "Della Valle", "Massimo", "" ] ]
19
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1,225,177
1912.13282
Jure Slak
Jure Slak and Gregor Kosec
Medusa: A C++ Library for solving PDEs using Strong Form Mesh-Free methods
null
ACM Transactions on Mathematical Software 47(3), June 2021
10.1145/3450966
null
cs.MS cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Medusa, a novel library for implementation of strong form mesh-free methods, is described. We identify and present common parts and patterns among many such methods reported in the literature, such as node positioning, stencil selection and stencil weight computation. Many different algorithms exist for each part and the possible combinations offer a plethora of possibilities for improvements of solution procedures that are far from fully understood. As a consequence there are still many unanswered questions in mesh-free community resulting in vivid ongoing research in the field. Medusa implements the core mesh-free elements as independent blocks, which offers users great flexibility in experimenting with the method they are developing, as well as easily comparing it with other existing methods. The paper describes the chosen abstractions and their usage, illustrates aspects of the philosophy and design, offers some executions time benchmarks and demonstrates the application of the library on cases from linear elasticity and fluid flow in irregular 2D and 3D domains.
[ { "created": "Tue, 31 Dec 2019 12:11:17 GMT", "version": "v1" } ]
2021-07-07
[ [ "Slak", "Jure", "" ], [ "Kosec", "Gregor", "" ] ]
19
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1,225,178
1912.13283
Alon Talmor
Alon Talmor, Yanai Elazar, Yoav Goldberg, Jonathan Berant
oLMpics -- On what Language Model Pre-training Captures
TACL 2020
null
null
null
cs.CL cs.AI cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent success of pre-trained language models (LMs) has spurred widespread interest in the language capabilities that they possess. However, efforts to understand whether LM representations are useful for symbolic reasoning tasks have been limited and scattered. In this work, we propose eight reasoning tasks, which conceptually require operations such as comparison, conjunction, and composition. A fundamental challenge is to understand whether the performance of a LM on a task should be attributed to the pre-trained representations or to the process of fine-tuning on the task data. To address this, we propose an evaluation protocol that includes both zero-shot evaluation (no fine-tuning), as well as comparing the learning curve of a fine-tuned LM to the learning curve of multiple controls, which paints a rich picture of the LM capabilities. Our main findings are that: (a) different LMs exhibit qualitatively different reasoning abilities, e.g., RoBERTa succeeds in reasoning tasks where BERT fails completely; (b) LMs do not reason in an abstract manner and are context-dependent, e.g., while RoBERTa can compare ages, it can do so only when the ages are in the typical range of human ages; (c) On half of our reasoning tasks all models fail completely. Our findings and infrastructure can help future work on designing new datasets, models and objective functions for pre-training.
[ { "created": "Tue, 31 Dec 2019 12:11:35 GMT", "version": "v1" }, { "created": "Thu, 19 Nov 2020 08:24:06 GMT", "version": "v2" } ]
2020-11-20
[ [ "Talmor", "Alon", "" ], [ "Elazar", "Yanai", "" ], [ "Goldberg", "Yoav", "" ], [ "Berant", "Jonathan", "" ] ]
19
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1,225,179
1912.13284
Xin Wang
Xin Wang
Lepton Flavor Mixing and CP Violation in the Minimal Type-(I+II) Seesaw Model with a Modular $A_4$ Symmetry
25 pages, 5 figures. Matches version published in NPB. arXiv admin note: text overlap with arXiv:1910.09473
null
10.1016/j.nuclphysb.2020.115105
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the implications of the modular $A^{}_4$ flavor symmetry in constructing a supersymmetric minimal type-(I+II) seesaw model, in which only one right-handed neutrino and two Higgs triplets are introduced to account for the tiny neutrino masses, flavor mixing and CP violation. The right-handed neutrino as well as the Higgs triplets in this model are assigned into the trivial one-dimensional irreducible representation of the modular group $A^{}_{4}$. We show that the individual contributions to the neutrino masses from the right-handed neutrino and the Higgs triplet are comparable. We also find that the neutrino mass matrix can possess an approximate $\mu-\tau$ reflection symmetry for some specific values of free model parameters. Moreover, our model predicts relatively large masses of three light neutrinos, thus can be easily tested in future neutrino experiments.
[ { "created": "Tue, 31 Dec 2019 12:13:26 GMT", "version": "v1" }, { "created": "Sun, 12 Jul 2020 05:28:09 GMT", "version": "v2" } ]
2020-08-26
[ [ "Wang", "Xin", "" ] ]
19
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1,225,180
1912.13285
Nail Akar
Omer Gursoy and Kamal Adli Mehr and Nail Akar
The MAP/M/s+G Call Center Model with General Patience Times: Stationary Solutions and First Passage Times
21 pages, 14 tables, 3 figures
Journal of Industrial Management and Optimization 2021
10.3934/jimo.2021078
null
cs.PF cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the MAP/M/s+G queuing model with MAP (Markovian Arrival Process) arrivals, exponentially distributed service times, infinite waiting room, and generally distributed patience times. Using sample-path arguments, we propose to obtain the steady-state distribution of the virtual waiting time and subsequently the other relevant performance metrics of interest for the MAP/M/s+G queue by means of finding the steady-state solution of a properly constructed Continuous Feedback Fluid Queue (CFFQ). The proposed method is exact when the patience time is a discrete random variable and is asymptotically exact when it is continuous/hybrid for which case discretization of the patience time distribution and subsequently the steady-state solution of a Multi-Regime Markov Fluid Queue (MRMFQ) is required. Besides the steady-state distribution, we also propose a new method to approximately obtain the first passage time distribution for the virtual and actual waiting times in the $MAP/M/s+G$ queue. Again, using sample-path arguments, finding the desired distribution is also shown to reduce to obtaining the steady-state solution of a larger dimensionality CFFQ where the deterministic time horizon is to be approximated by Erlang or Concentrated Matrix Exponential (CME) distributions. Numerical results are presented to validate the effectiveness of the proposed method.
[ { "created": "Tue, 31 Dec 2019 12:15:30 GMT", "version": "v1" } ]
2021-10-22
[ [ "Gursoy", "Omer", "" ], [ "Mehr", "Kamal Adli", "" ], [ "Akar", "Nail", "" ] ]
19
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1,225,181
1912.13286
Keerti Choudhary
Amotz Bar-Noy, Keerti Choudhary, David Peleg, Dror Rawitz
Graph Realizations: Maximum and Minimum Degree in Vertex Neighborhoods
26 pages, 4 figures
null
null
null
cs.DS cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The classical problem of degree sequence realizability asks whether or not a given sequence of $n$ positive integers is equal to the degree sequence of some $n$-vertex undirected simple graph. While the realizability problem of degree sequences has been well studied for different classes of graphs, there has been relatively little work concerning the realizability of other types of information profiles, such as the vertex neighborhood profiles. In this paper, we initiate the study of neighborhood degree profiles. We focus on the natural problem of realizing maximum and minimum neighborhood degrees. More specifically, we ask the following question: Given a sequence $D$ of $n$ non-negative integers $0\leq d_1\leq \cdots \leq d_n$, does there exist a simple graph with vertices $v_1,\ldots, v_n$ such that for every $1\le i \le n$, the maximum (resp. minimum) degree in the neighborhood of $v_i$ is exactly $d_i$? We provide in this work various results for both maximum as well as minimum neighborhood degree for general $n$ vertex graphs. Our results are first of its kind that studies extremal neighborhood degree profiles. For maximum neighborhood degree profiles, we provide a {\em complete realizability criteria}. In comparison, we observe that the minimum neighborhood profiles are not so well-behaved, for these our necessary and sufficient conditions for realizability {\em differ by a factor of at most two}.
[ { "created": "Tue, 31 Dec 2019 12:16:28 GMT", "version": "v1" } ]
2020-01-01
[ [ "Bar-Noy", "Amotz", "" ], [ "Choudhary", "Keerti", "" ], [ "Peleg", "David", "" ], [ "Rawitz", "Dror", "" ] ]
19
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1,225,182
1912.13287
Keerti Choudhary
Amotz Bar-Noy, Keerti Choudhary, David Peleg, Dror Rawitz
Efficiently Realizing Interval Sequences
19 pages, 1 figure
null
null
null
cs.DS cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of realizable interval-sequences. An interval sequence comprises of $n$ integer intervals $[a_i,b_i]$ such that $0\leq a_i \leq b_i \leq n-1$, and is said to be graphic/realizable if there exists a graph with degree sequence, say, $D=(d_1,\ldots,d_n)$ satisfying the condition $a_i \leq d_i \leq b_i$, for each $i \in [1,n]$. There is a characterisation (also implying an $O(n)$ verifying algorithm) known for realizability of interval-sequences, which is a generalization of the Erdos-Gallai characterisation for graphic sequences. However, given any realizable interval-sequence, there is no known algorithm for computing a corresponding graphic certificate in $o(n^2)$ time. In this paper, we provide an $O(n \log n)$ time algorithm for computing a graphic sequence for any realizable interval sequence. In addition, when the interval sequence is non-realizable, we show how to find a graphic sequence having minimum deviation with respect to the given interval sequence, in the same time. Finally, we consider variants of the problem such as computing the most regular graphic sequence, and computing a minimum extension of a length $p$ non-graphic sequence to a graphic one.
[ { "created": "Tue, 31 Dec 2019 12:19:13 GMT", "version": "v1" } ]
2020-01-01
[ [ "Bar-Noy", "Amotz", "" ], [ "Choudhary", "Keerti", "" ], [ "Peleg", "David", "" ], [ "Rawitz", "Dror", "" ] ]
19
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1,225,183
1912.13288
Carlos I. P\'erez-S\'anchez
Carlos I. Perez-Sanchez
Computing the spectral action for fuzzy geometries: from random noncommutative geometry to bi-tracial multimatrix models
51 pages (45+6), some figures. v5. Minor amend to Prop. 4.1 and syntax of Def. 2.2
J. Noncommut. Geom. 16 (2022), no. 4, pp. 1137-1178
10.4171/JNCG/482
null
math-ph hep-th math.CO math.MP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fuzzy geometry is a certain type of spectral triple whose Dirac operator crucially turns out to be a finite matrix. This notion was introduced in [J. Barrett, J. Math. Phys. 56, 082301 (2015)] and accommodates familiar fuzzy spaces like spheres and tori. In the framework of random noncommutative geometry, we use Barrett's characterization of Dirac operators of fuzzy geometries in order to systematically compute the spectral action $S(D)= \mathrm{Tr} f(D)$ for $2n$-dimensional fuzzy geometries. In contrast to the original Chamseddine-Connes spectral action, we take a polynomial $f$ with $f(x)\to \infty$ as $ |x|\to\infty$ in order to obtain a well-defined path integral that can be stated as a random matrix model with action of the type $S(D)=N \cdot \mathrm{tr}\, F+\textstyle\sum_i \mathrm{tr}\,A_i \cdot \mathrm{tr} \,B_i $, being $F,A_i $ and $B_i $ noncommutative polynomials in $2^{2n-1}$ complex $N\times N$ matrices that parametrize the Dirac operator $D$. For arbitrary signature---thus for any admissible KO-dimension---formulas for 2-dimensional fuzzy geometries are given up to a sextic polynomial, and up to a quartic polynomial for 4-dimensional ones, with focus on the octo-matrix models for Lorentzian and Riemannian signatures. The noncommutative polynomials $F,A_i $ and $B_i$ are obtained via chord diagrams and satisfy: independence of $N$; self-adjointness of the main polynomial $F$ (modulo cyclic reordering of each monomial); also up to cyclicity, either self-adjointness or anti-self-adjointness of $A_i $ and $B_i $ simultaneously, for fixed $i$. Collectively, this favors a free probabilistic perspective for the large-$N$ limit we elaborate on.
[ { "created": "Tue, 31 Dec 2019 12:29:34 GMT", "version": "v1" }, { "created": "Mon, 6 Jan 2020 15:01:42 GMT", "version": "v2" }, { "created": "Wed, 15 Jan 2020 14:10:39 GMT", "version": "v3" }, { "created": "Mon, 27 Jan 2020 13:53:26 GMT", "version": "v4" }, { "created": "Mon, 13 Jul 2020 14:20:09 GMT", "version": "v5" } ]
2023-02-13
[ [ "Perez-Sanchez", "Carlos I.", "" ] ]
19
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1,225,184
1912.13289
Kenichiro Sato
Kenichiro Sato and Sumio Watanabe
Bayesian Generalization Error of Poisson Mixture and Simplex Vandermonde Matrix Type Singularity
33 pages
null
null
null
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Poisson mixture is one of the practically important models in computer science, biology, and sociology. However, the theoretical property has not been studied because the posterior distribution can not be approximated by any normal distribution. Such a model is called singular and it is known that Real Log Canonical Threshold (RLCT) is equal to the coefficient of the asymptotically main term of the Bayesian generalization error. In this paper, we derive RLCT of a simplex Vandermonde matrix type singularity which is equal to that of a Poisson mixture in general cases.
[ { "created": "Tue, 31 Dec 2019 12:32:09 GMT", "version": "v1" } ]
2020-01-01
[ [ "Sato", "Kenichiro", "" ], [ "Watanabe", "Sumio", "" ] ]
19
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1,225,185
1912.13290
Vladimir Novik
N. S. Kulberg (1 and 3), A. B. Elizarov (1), V. P. Novik (1), V. A. Gombolevsky (1), A. P. Gonchar (1), A. L. Alliua (2), V. Yu. Bosin (1), A. V. Vladzymyrsky (1), S. P. Morozov (1) ((1) State Budget-Funded Health Care Institution of the City of Moscow Research and Practical Clinical Center for Diagnostics and Telemedicine Technologies of the Moscow Health Care Department, (2) Federal State Budgetary Scientific Institution Russian Scientific Center of Surgery named after Academician B.V. Petrovsky, (3) Federal Research Center Computer Science and Control of Russian Academy of Sciences)
Automatic segmentation and determining radiodensity of the liver in a large-scale CT database
16 pages, 8 figures
null
null
null
eess.IV cs.CV physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This study proposes an automatic technique for liver segmentation in computed tomography (CT) images. Localization of the liver volume is based on the correlation with an optimized set of liver templates developed by the authors that allows clear geometric interpretation. Radiodensity values are calculated based on the boundaries of the segmented liver, which allows identifying liver abnormalities. The performance of the technique was evaluated on 700 CT images from dataset of the Unified Radiological Information System (URIS) of Moscow. Despite the decrease in accuracy, the technique is applicable to CT volumes with a partially visible region of the liver. The technique can be used to process CT images obtained in various patient positions in a wide range of exposition parameters. It is capable in dealing with low dose CT scans in real large-scale medical database with over 1 million of studies.
[ { "created": "Tue, 31 Dec 2019 12:41:05 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kulberg", "N. S.", "", "1 and 3" ], [ "Elizarov", "A. B.", "" ], [ "Novik", "V. P.", "" ], [ "Gombolevsky", "V. A.", "" ], [ "Gonchar", "A. P.", "" ], [ "Alliua", "A. L.", "" ], [ "Bosin", "V. Yu.", "" ], [ "Vladzymyrsky", "A. V.", "" ], [ "Morozov", "S. P.", "" ] ]
19
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-1.3114920854568481, -1.1614493131637573, 0.8506553173065186 ]
1,225,186
1912.13291
Kui Du
Kui Du, Xiaohui Sun
A doubly stochastic block Gauss-Seidel algorithm for solving linear equations
14 pages, 2 figures. More general results are given in this version
null
null
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a simple doubly stochastic block Gauss--Seidel algorithm for solving linear systems of equations. By varying the row partition parameter and the column partition parameter of the coefficient matrix, we recover the Landweber algorithm, the randomized Kaczmarz algorithm, the randomized Gauss--Seidel algorithm, and the doubly stochastic Gauss--Seidel algorithm. For general (consistent or inconsistent) linear systems, we show the exponential convergence of the {\it norms of the expected iterates} via exact formulas. For consistent linear systems, we prove the exponential convergence of the {\it expected norms of the error and the residual}. Numerical experiments are given to illustrate the efficiency of the proposed algorithm.
[ { "created": "Tue, 31 Dec 2019 12:42:26 GMT", "version": "v1" }, { "created": "Wed, 1 Jan 2020 12:48:41 GMT", "version": "v2" }, { "created": "Wed, 8 Jul 2020 03:58:47 GMT", "version": "v3" } ]
2020-07-09
[ [ "Du", "Kui", "" ], [ "Sun", "Xiaohui", "" ] ]
19
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1,225,187
1912.13292
Vladimir Vovk
Vladimir Vovk and Ruodu Wang
Confidence and discoveries with e-values
50 pages, 13 figures, and 5 tables
Statistical Science 38, 329-354 (2023)
10.1214/22-STS874
null
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss systematically two versions of confidence regions: those based on p-values and those based on e-values, a recent alternative to p-values. Both versions can be applied to multiple hypothesis testing, and in this paper we are interested in procedures that control the number of false discoveries under arbitrary dependence between the base p- or e-values. We introduce a procedure that is based on e-values and show that it is efficient both computationally and statistically using simulated and real-world datasets. Comparison with the corresponding standard procedure based on p-values is not straightforward, but there are indications that the new one performs significantly better in some situations.
[ { "created": "Tue, 31 Dec 2019 12:48:57 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2020 16:28:07 GMT", "version": "v2" }, { "created": "Mon, 20 Sep 2021 16:01:38 GMT", "version": "v3" }, { "created": "Mon, 21 Feb 2022 13:03:27 GMT", "version": "v4" }, { "created": "Thu, 10 Nov 2022 09:01:27 GMT", "version": "v5" } ]
2024-03-05
[ [ "Vovk", "Vladimir", "" ], [ "Wang", "Ruodu", "" ] ]
19
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1,225,188
1912.13293
Evgeny F. Talantsev
E.F. Talantsev
Unconventional superconductivity in highly-compressed unannealed sulphur hydride
8 pages, 2 figures, 1 table
Results in Physics 16, 102993 (2020)
10.1016/j.rinp.2020.102993
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
While great scientific efforts focus on the synthesis and studies of near-room-temperature (NRT) superconductors exhibited record superconducting transition temperatures (for instance, laser annealed H3S, LaH10 and YHn (n = 4,6,7,9) with Tc > 200 K), unannealed low-Tc counterparts of NRT superconductors stay in the background. However, the formers are part of hydrogen-rich superconductors family and the success in understanding of NRT superconductivity depends on the study of these materials too. In this paper we analyse experimental temperature dependent upper critical field data, Bc2(T), reported by Drozdov et al (Nature 525, 73 (2015)) for unannealed highly-compressed (P = 155 GPa) sulphur hydride with Tc = 46 K and show that this material is unconventional superconductor which exhibits the ratio of Tc to the Fermi temperature, TF, in the range of 0.02 < Tc/TF < 0.05.
[ { "created": "Tue, 31 Dec 2019 12:59:02 GMT", "version": "v1" }, { "created": "Thu, 2 Jan 2020 13:08:33 GMT", "version": "v2" }, { "created": "Mon, 9 Mar 2020 07:47:16 GMT", "version": "v3" }, { "created": "Mon, 20 Apr 2020 10:32:55 GMT", "version": "v4" } ]
2020-04-21
[ [ "Talantsev", "E. F.", "" ] ]
19
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1,225,189
1912.13294
Taizan Watari
Satoshi Kondo and Taizan Watari
Modular Parametrization as Polyakov Path Integral: Cases with CM Elliptic Curves as Target Spaces
110 pages
null
null
IPMU19-0191
hep-th math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For an elliptic curve E over an abelian extension k/K with CM by K of Shimura type, the L-functions of its [k:K] Galois representations are Mellin transforms of Hecke theta functions; a modular parametrization (surjective map) from a modular curve to E pulls back the 1-forms on E to give the Hecke theta functions. This article refines the study of our earlier work and shows that certain class of chiral correlation functions in Type II string theory with [E]_C (E as real analytic manifold) as a target space yield the same Hecke theta functions as objects on the modular curve. The Kahler parameter of the target space [E]_C in string theory plays the role of the index (partially ordered) set in defining the projective/direct limit of modular curves.
[ { "created": "Tue, 31 Dec 2019 12:59:54 GMT", "version": "v1" } ]
2020-01-01
[ [ "Kondo", "Satoshi", "" ], [ "Watari", "Taizan", "" ] ]
19
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1,225,190
1912.13295
Godfred Koi-Akrofi
Godfred Yaw Koi-Akrofi
IT Project Governance in Project Delivery: Key Processes, Activities, Roles and Responsibilities
2 Tables, 1 Figure, 12 Pages
Texila International Journal of Management. Volume 3, Issue 2, Nov 2017
10.21522/TIJMG.2015.03.01.Art023
null
cs.SE
http://creativecommons.org/licenses/by/4.0/
The general objective of this work was to contribute to the general body of knowledge and research work in the area of managing IT projects successfully. The office of Government commerce of the UK Government in conjunction with the National Audit came out with a guideline in 2007 which list out eight causes of project failures. Six out of the eight causes were attributed to governance issues (Aon, 2011). This shows clearly that governance activities in project management are really important, and failure to place premium on them can result in failure of projects. The research work was therefore intended to come out with IT governance frameworks that can help resolve the problem of failure of IT projects resulting from governance issues. Four IT program managers and eight IT project managers were talked to on a variety of IT project governance issues. The frameworks were developed based on a combination of literature, experts (IT project and program managers of the telecom industry in Ghana) input, observation, and so on. The governance frameworks depicts project management processes, project activities, project governance activities, roles and responsibilities of key stakeholders, key milestones, approval bodies, signatures, and so on, to ensure successful delivery of IT projects.
[ { "created": "Tue, 19 Nov 2019 14:26:12 GMT", "version": "v1" } ]
2020-01-01
[ [ "Koi-Akrofi", "Godfred Yaw", "" ] ]
19
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1,225,191
1912.13296
Andrei Zaitsev Yu.
Friedrich G\"otze, Andrei Yu. Zaitsev, and Dmitry Zaporozhets
An improved multivariate version of Kolmogorov's second uniform limit theorem
12 pages
Zapiski Nauchnykh Seminarov POMI, 2019, v.486, 71-85 (in Russian);English translation in J. Math. Sci. (N. Y.), 258 (2021), 782-792
10.1007/s10958-021-05594-x
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of the present work is to show that the results obtained earlier on the approximation of distributions of sums of independent summands by infinitely divisible laws may be transferred to the estimation of the closeness of distributions on convex polyhedra.
[ { "created": "Tue, 31 Dec 2019 13:11:59 GMT", "version": "v1" }, { "created": "Thu, 27 Feb 2020 14:41:38 GMT", "version": "v2" } ]
2022-08-04
[ [ "Götze", "Friedrich", "" ], [ "Zaitsev", "Andrei Yu.", "" ], [ "Zaporozhets", "Dmitry", "" ] ]
19
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1,225,192
1912.13297
Grzegorz Plebanek
Grzegorz Plebanek
Monolithic spaces of measures
12 pages; final version
null
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a compact space $K$ we consider the space $P(K)$, of probability regular Borel measures on $K$, equipped with the $weak^\ast$ topology inherited from $C(K)^\ast$. We discuss possible characterizations of those compact spaces $K$ for which $P(K)$ is $\aleph_0$-monolithic. The main result states that under $\diamondsuit$ there exists a nonseparable Corson compact space $K$ such that $P(K)$ is $\aleph_0$-monolithic but $K$ supports a measure of uncountable type.
[ { "created": "Tue, 31 Dec 2019 13:17:48 GMT", "version": "v1" }, { "created": "Thu, 2 Jan 2020 21:06:22 GMT", "version": "v2" }, { "created": "Thu, 17 Sep 2020 14:42:36 GMT", "version": "v3" } ]
2020-09-18
[ [ "Plebanek", "Grzegorz", "" ] ]
19
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1,225,193
1912.13298
Maximilian Schambach
Maximilian Schambach and Fernando Puente Le\'on
Microlens array grid estimation, light field decoding, and calibration
\copyright 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
IEEE Transactions on Computational Imaging, vol. 6, pp. 591-603, 2020
10.1109/tci.2020.2964257
null
eess.IV cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We quantitatively investigate multiple algorithms for microlens array grid estimation for microlens array-based light field cameras. Explicitly taking into account natural and mechanical vignetting effects, we propose a new method for microlens array grid estimation that outperforms the ones previously discussed in the literature. To quantify the performance of the algorithms, we propose an evaluation pipeline utilizing application-specific ray-traced white images with known microlens positions. Using a large dataset of synthesized white images, we thoroughly compare the performance of the different estimation algorithms. As an example, we apply our results to the decoding and calibration of light fields taken with a Lytro Illum camera. We observe that decoding as well as calibration benefit from a more accurate, vignetting-aware grid estimation, especially in peripheral subapertures of the light field.
[ { "created": "Tue, 31 Dec 2019 13:27:13 GMT", "version": "v1" } ]
2020-10-19
[ [ "Schambach", "Maximilian", "" ], [ "León", "Fernando Puente", "" ] ]
19
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1,225,194
1912.13299
Shixuan Li
Shixuan Li
Low dilatation pseudo-Anosovs on punctured surfaces and volume
18 pages, 11 figures
null
null
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a pseudo-Anosov homeomorphism $f$ on a closed surface of genus $g\geq 2$, for which the entropy is on the order $\frac{1}{g}$ (the lowest possible order), Farb-Leininger-Margalit showed that the volume of the mapping torus is bounded, independent of $g$. We show that the analogous result fails for a surface of fixed genus $g$ with $n$ punctures, by constructing pseudo-Anosov homeomorphism with entropy of the minimal order $\frac{\log n}{n}$, and volume tending to infinity.
[ { "created": "Tue, 31 Dec 2019 13:34:09 GMT", "version": "v1" } ]
2020-01-01
[ [ "Li", "Shixuan", "" ] ]
19
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1,225,195
1912.13300
Jarek Duda Dr
Jarek Duda
Nearly accurate solutions for Ising-like models using Maximal Entropy Random Walk
7 pages, 4 figures
null
null
null
cs.IT cond-mat.stat-mech math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
While one-dimensional Markov processes are well understood, going to higher dimensions there are only a few analytically solved Ising-like models, in practice requiring to use relatively costly, uncontrollable and inaccurate Monte-Carlo methods. There is discussed analytical approach for e.g. $width\times \infty$ approximation of lattice, also exploiting Hammersley-Clifford theorem to generate random Gibbs/Markov field through scanning line-by-line using local statistical model as in lossless image compression. While its conditional distributions could be found with Monte-Carlo methods, there is discussed use of Maximal Entropy Random Walk (MERW) to calculate them from approximation of lattice as infinite in one direction and finite in the remaining. Specifically, in the finite directions there is built alphabet of all patterns, then transition matrix containing energy for all pairs of such patterns is built, from its dominant eigenvector getting probability distribution of pairs of patterns in Boltzmann distribution of their infinite sequences, which can be translated into local statistical model for line-by-line scan. Such inexpensive models, requiring seconds on a laptop for attached implementation and directly providing probability distributions of patterns, were tested for mean entropy and energy per node, getting maximal $\approx 0.02$ error from analytical solution near critical point, which quickly improves to extremely accurate e.g. $\approx 10^{-10}$ error for $J\approx 0.2$.
[ { "created": "Tue, 31 Dec 2019 13:35:05 GMT", "version": "v1" }, { "created": "Mon, 6 Jan 2020 13:21:36 GMT", "version": "v2" }, { "created": "Tue, 21 Jan 2020 17:16:40 GMT", "version": "v3" }, { "created": "Mon, 27 Jan 2020 08:51:05 GMT", "version": "v4" }, { "created": "Mon, 19 Apr 2021 14:01:04 GMT", "version": "v5" } ]
2021-04-20
[ [ "Duda", "Jarek", "" ] ]
19
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1,225,196
1912.13301
Han Mao Kiah
Yeow Meng Chee, Duc Tu Dao, Han Mao Kiah, San Ling, Hengjia Wei
Robust Positioning Patterns with Low Redundancy
Extended Version of SODA 2019 Paper
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A robust positioning pattern is a large array that allows a mobile device to locate its position by reading a possibly corrupted small window around it. In this paper, we provide constructions of binary positioning patterns, equipped with efficient locating algorithms, that are robust to a constant number of errors and have redundancy within a constant factor of optimality. Furthermore, we modify our constructions to correct rank errors and obtain binary positioning patterns robust to any errors of rank less than a constant number. Additionally, we construct $q$-ary robust positioning sequences robust to a large number of errors, some of which have length attaining the upper bound. Our construction of binary positioning sequences that are robust to a constant number of errors has the least known redundancy amongst those explicit constructions with efficient locating algorithms. On the other hand, for binary robust positioning arrays, our construction is the first explicit construction whose redundancy is within a constant factor of optimality. The locating algorithms accompanying both constructions run in time cubic in sequence length or array dimension.
[ { "created": "Tue, 31 Dec 2019 13:36:24 GMT", "version": "v1" } ]
2020-01-01
[ [ "Chee", "Yeow Meng", "" ], [ "Dao", "Duc Tu", "" ], [ "Kiah", "Han Mao", "" ], [ "Ling", "San", "" ], [ "Wei", "Hengjia", "" ] ]
19
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-0.5438941121101379, 0.32461753487586975 ]
1,225,197
1912.13302
Howard E. Haber
Howard E. Haber
Useful relations among the generators in the defining and adjoint representations of SU(N)
11 pages, a collection of useful formulae from a variety of sources; version 2 matches the published version
SciPost Phys. Lect. Notes 21 (2021)
10.21468/SciPostPhysLectNotes.21
null
math-ph hep-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There are numerous relations among the generators in the defining and adjoint representations of SU(N). These include Casimir operators, formulae for traces of products of generators, etc. Due to the existence of the completely symmetric tensor $d_{abc}$ that arises in the study of the SU(N) Lie algebra, one can also consider relations that involve the adjoint representation matrix, $(D^a)_{bc}=d_{abc}$. In this review, we summarize many useful relations satisfied by the defining and adjoint representation matrices of SU(N). A few relations special to the case of N=3 are highlighted.
[ { "created": "Tue, 31 Dec 2019 13:39:21 GMT", "version": "v1" }, { "created": "Thu, 21 Jan 2021 00:07:45 GMT", "version": "v2" } ]
2021-01-22
[ [ "Haber", "Howard E.", "" ] ]
19
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1,225,198
1912.13303
Nobuyuki Matsumoto
Masafumi Fukuma, Nobuyuki Matsumoto and Naoya Umeda
Implementation of the HMC algorithm on the tempered Lefschetz thimble method
32 pages, 15 figures. v2: typos corrected, some arguments clarified
null
null
KUNS-2783
hep-lat hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The tempered Lefschetz thimble method (TLTM) is a parallel-tempering algorithm towards solving the numerical sign problem, where the system is tempered by the antiholomorphic gradient flow to tame both the sign and ergodicity problems simultaneously. In this paper, we implement the hybrid Monte Carlo (HMC) algorithm for transitions on each flowed surface, expecting that this implementation on TLTM will give a useful framework for future computations of large-scale systems including fermions. Although the use of HMC in Lefschetz thimble methods has been proposed so far, our crucial achievement here is that HMC is implemented on TLTM so as to work within the parallel-tempering algorithm in TLTM, especially by developing an algorithm to handle zeros of fermion determinants in the course of the molecular-dynamics process. We confirm that the algorithm works correctly by applying it to the sign problem of the Hubbard model on a small lattice, for which the TLTM is known to work with the Metropolis algorithm. We show that the use of HMC significantly reduces the autocorrelation times with less computational times compared to the Metropolis algorithm.
[ { "created": "Tue, 31 Dec 2019 13:42:57 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2020 15:05:42 GMT", "version": "v2" } ]
2020-02-14
[ [ "Fukuma", "Masafumi", "" ], [ "Matsumoto", "Nobuyuki", "" ], [ "Umeda", "Naoya", "" ] ]
19
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