cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Correlation of Spectral Lag Evolution with Prompt Optical Emission in GRBs?
Creators: name: Stamatikos, Michael
name: Ukwatta, Tilan N.
name: Sakamoto, Takanori
name: Dhuga, Kalvir S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on observations of correlated behavior between the prompt gamma-ray and optical emission from GRB 080319B, which (i) strongly suggest that they occurred within the same astrophysical source region and (ii) indicate that their respective radiation mechanisms were most likely dynamically coupled. Our preliminary results, based upon a new cross-correlation function (CCF) methodology for determining the time-resolved spectral lag, are summarized as follows. First, the evolution in the arrival offset of prompt gamma-ray photon counts between Swift-BAT 15-25 keV and 50-100 keV energy bands (intrinsic gamma-ray spectral lag) appears to be anti-correlated with the arrival offset between prompt 15-350 keV gamma-rays and the optical emission observed by TORTORA (extrinsic optical/gamma-ray spectral lag), thus effectively partitioning the burst into two main episodes at ~T+28+/-2 sec. Second, prompt optical emission is nested within intervals of (a) trivial intrinsic gamma-ray spectral lag (~T+12+-2 and ~T+50+/-2 sec) with (b) discontinuities in the hard to soft evolution of the photon index for a power law fit to 15-150 keV Swift-BAT data (~T+8+/-2 and ~T+48+/-1 sec), both of which coincide with the rise (~T+10+/-1 sec) and decline (~T+50+/-1 sec) of prompt optical emission. This potential discovery, robust across heuristic permutations of BAT energy channels and varying temporal bin resolution, provides the first observational evidence for an implicit connection between spectral lag and the dynamics of shocks in the context of canonical fireball phenomenology.
description: 5 pages. Adapted from a contribution to the Proceedings of the 2008 Nanjing GRB Conference. Edited by Y. F. Huang, Z. G. Dai and B. Zhang
Anomalous dimension with wrapping at four loops in N=4 SYM
Creators: name: Fiamberti, F.
name: Santambrogio, A.
name: Sieg, C.
name: Zanon, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we give all the details of the calculation that we presented in our previous paper arXiv:0712.3522, concerning the four-loop anomalous dimension of the Konishi descendant tr(ϕZϕZ-ϕϕZ Z) in the SU(2) sector of the N=4 planar SYM theory. We explicitly consider all the wrapping diagrams that we compute using an N=1 superspace approach and Gegenbauer polynomial x-space techniques.
description: LaTeX, mpost, feynmf, 48 pages, 17 figures, 13 tables; v2: symmetry factor of 2 corrected in W_D which modifies the rational part of the final result, references added
High speed quantum gates with cavity quantum electrodynamics
Creators: name: Su, Chun-Hsu
name: Greentree, Andrew D.
name: Munro, William J.
name: Nemoto, Kae
name: Hollenberg, Lloyd C. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Cavity quantum electrodynamic schemes for quantum gates are amongst the earliest quantum computing proposals. Despite continued progress, and the dramatic recent demonstration of photon blockade, there are still issues with optimal coupling and gate operation involving high-quality cavities. Here we show dynamic control techniques that allow scalable cavity-QED based quantum gates, that use the full bandwidth of the cavities. When applied to quantum gates, these techniques allow an order of magnitude increase in operating speed, and two orders of magnitude reduction in cavity Q, over passive cavity-QED architectures. Our methods exploit Stark shift based Q-switching, and are ideally suited to solid-state integrated optical approaches to quantum computing.
description: 4 pages, 3 figures, minor revisions
The influence of the symmetry of identical particles on flight times
Creators: name: Miret-Artés, Salvador
name: Dumont, Randall S.
name: Rivlin, Tom
name: Pollak, Eli
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work, our purpose is to show how the symmetry of identical particles can influence the time evolution of free particles in the nonrelativistic and relativistic domains. For this goal, we consider a system of either two distinguishable or indistinguishable (bosons and fermions) particles. Two classes of initial conditions have been studied: different initial locations with the same momenta, and the same locations with different momenta. The flight time distribution of particles arriving at a `screen' is calculated in each case. Fermions display broader distributions as compared with either distinguishable particles or bosons, leading to earlier and later arrivals for all the cases analyzed here. The symmetry of the wave function seems to speed up or slow down propagation of particles. Due to the cross terms, certain initial conditions lead to bimodality in the fermionic case. Within the nonrelativistic domain and when the short-time survival probability is analyzed, if the cross term becomes important, one finds that the decay of the overlap of fermions is faster than for distinguishable particles which in turn is faster than for bosons. These results are of interest in the short time limit since they imply that the well-known quantum Zeno effect would be stronger for bosons than for fermions.Fermions also arrive earlier than bosons when they are scattered by a delta barrier. Furthermore, the particle symmetry does not affect the mean tunneling flight time and it is given by the phase time for the distinguishable particle.
description: 25 pages, 1 table, 5 figures
A solenoidal electron spectrometer for a precision measurement of the neutron $β$-asymmetry with ultracold neutrons
Creators: name: Plaster, B.
name: Carr, R.
name: Filippone, B. W.
name: Harrison, D.
name: Hsiao, J.
name: Ito, T. M.
name: Liu, J.
name: Martin, J. W.
name: Tipton, B.
name: Yuan, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We describe an electron spectrometer designed for a precision measurement of the neutron $β$-asymmetry with spin-polarized ultracold neutrons. The spectrometer consists of a 1.0-Tesla solenoidal field with two identical multiwire proportional chamber and plastic scintillator electron detector packages situated within 0.6-Tesla field-expansion regions. Select results from performance studies of the spectrometer with calibration sources are reported.
description: 30 pages, 19 figures, 1 table, submitted to NIM A
Toward a Proof of Montonen-Olive Duality via Multiple M2-branes
Creators: name: Hashimoto, Koji
name: Tai, Ta-Sheng
name: Terashima, Seiji
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive 4-dimensional N=4 U(N) supersymmetric Yang-Mills theory from a 3-dimensional Chern-Simons-matter theory with product gauge group U(N)^{2n}. The latter describes M2-branes probing an orbifold where a torus emerges in a scaling limit. It is expected that the SL(2, Z) duality of the 4-dimensional Yang-Mills theory will be shown in M-theory point of view since it is trivially realized as modular transformations of the torus. Indeed, starting from one single Chern-Simons-matter theory, we find infinitely many equivalent 4-dimensional theories differing up to T-transformation of the SL(2, Z) redefinition of the gauge coupling tau=theta/2pi + 4pi i/g^2 and a parity transformation in 4 dimensions. Although S-transformation can not be shown in our work, it is important that a part of the SL(2, Z) transformation is realized via the M2-brane action. Thus we think our work can be a step toward a proof of Montonen-Olive duality via M2-branes.
description: 28 pages, 2 figures, JHEP style; v2: references added; v3: published version. Abstract improved, Appendix A added forderiving the fermionic sector
Rotational spectroscopy of isotopic vinyl cyanide, H$_2$C=CH$-$C$\equiv$N, in the laboratory and in space
Creators: name: Müller, Holger S. P.
name: Belloche, Arnaud
name: Menten, Karl M.
name: Comito, Claudia
name: Schilke, Peter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The rotational spectra of singly substituted $^{13}$C and $^{15}$N isotopic species of vinyl cyanide have been studied in natural abundances between 64 and 351 GHz. In combination with previous results, greatly improved spectroscopic parameters have been obtained which in turn helped to identify transitions of the $^{13}$C species for the first time in space through a molecular line survey of the extremely line-rich interstellar source Sagittarius B2(N) in the 3 mm region with some additional observations at 2 mm. The $^{13}$C species are detected in two compact ($\sim 2.3''$), hot (170 K) cores with a column density of $\sim 3.8 \times 10^{16}$ and $1.1 \times 10^{16}$ cm$^{-2}$, respectively. In the main source, the so-called ``Large Molecule Heimat'', we derive an abundance of $2.9 \times 10^{-9}$ for each $^{13}$C species relative to H$_2$. An isotopic ratio $^{12}$C/$^{13}$C of 21 has been measured. Based on a comparison to the column densities measured for the $^{13}$C species of ethyl cyanide also detected in this survey, it is suggested that the two hot cores of Sgr B2(N) are in different evolutionary stages. Supplementary laboratory data for the main isotopic species recorded between 92 and 342 GHz permitted an improvement of its spectroscopic parameters as well.
description: 18 pages, including 2 tables, 3 figures; plus one supplementary text file plus one supplementary pdf file; J. Mol. Spectrosc., in press (to appear in the July or August issue of 2008)
Radio Detection of PSR J1813-1749 in HESS J1813-178: The Most Scattered Pulsar Known
Creators: name: Camilo, F.
name: Ransom, S. M.
name: Halpern, J. P.
name: Roshi, D. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The 44.7 ms X-ray pulsar in the supernova remnant G12.82-0.02/HESS J1813-178 has the second highest spin-down luminosity of known pulsars in the Galaxy, with E-dot=5.6e37 erg/s. Using the Green Bank Telescope, we have detected radio pulsations from PSR J1813-1749 at 4.4-10.2 GHz. The pulse is highly scattered, with an exponential decay timescale τlonger than that of any other pulsar at these frequencies. A point source detected at this position by Dzib et al. in several observations with the Jansky Very Large Array can be attributed to the pulsed emission. The steep dependence of τon observing frequency explains why all previous pulsation searches at lower frequencies failed (τ~0.25 s at 2 GHz). The large dispersion measure, DM=1087 pc/cc, indicates a distance of either 6.2 or 12 kpc according to two widely used models of the electron density distribution in the Galaxy. These disfavor a previously suggested association with a young stellar cluster at the closer distance of 4.8 kpc. The high X-ray measured column density of ~1e23/cm^2 also supports a large distance. If at d~12 kpc, HESS J1813-178 would be one of the most luminous TeV sources in the Galaxy.
description: Accepted by ApJ; 8 pages, 7 figures
Region Semantically Aligned Network for Zero-Shot Learning
Creators: name: Wang, Ziyang
name: Gou, Yunhao
name: Li, Jingjing
name: Zhang, Yu
name: Yang, Yang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Zero-shot learning (ZSL) aims to recognize unseen classes based on the knowledge of seen classes. Previous methods focused on learning direct embeddings from global features to the semantic space in hope of knowledge transfer from seen classes to unseen classes. However, an unseen class shares local visual features with a set of seen classes and leveraging global visual features makes the knowledge transfer ineffective. To tackle this problem, we propose a Region Semantically Aligned Network (RSAN), which maps local features of unseen classes to their semantic attributes. Instead of using global features which are obtained by an average pooling layer after an image encoder, we directly utilize the output of the image encoder which maintains local information of the image. Concretely, we obtain each attribute from a specific region of the output and exploit these attributes for recognition. As a result, the knowledge of seen classes can be successfully transferred to unseen classes in a region-bases manner. In addition, we regularize the image encoder through attribute regression with a semantic knowledge to extract robust and attribute-related visual features. Experiments on several standard ZSL datasets reveal the benefit of the proposed RSAN method, outperforming state-of-the-art methods.
description: Accepted to CIKM 2021
Hall-Littlewood plane partitions and KP
Creators: name: Foda, O
name: Wheeler, M
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: MacMahon's classic generating function of random plane partitions, which is related to Schur polynomials, was recently extended by Vuletic to a generating function of weighted plane partitions that is related to Hall-Littlewood polynomials, S(t), and further to one related to Macdonald polynomials, S(t,q). Using Jing's 1-parameter deformation of charged free fermions, we obtain a Fock space derivation of the Hall-Littlewood extension. Confining the plane partitions to a finite s-by-s square base, we show that the resulting generating function, S_{s-by-s}(t), is an evaluation of a tau-function of KP.
description: 17 pages, minor changes, added a subsection and comments to clarify content, no changes made to conclusions, version to appear in IMRN
Diffeomorphic Particle Image Velocimetry
Creators: name: Lee, Yong
name: Mei, Shuang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The existing particle image velocimetry (PIV) do not consider the curvature effect of the non-straight particle trajectory, because it seems to be impossible to obtain the curvature information from a pair of particle images. As a result, the computed vector underestimates the real velocity due to the straight-line approximation, that further causes a systematic error for the PIV instrument. In this work, the particle curved trajectory between two recordings is firstly explained with the streamline segment of a steady flow (diffeomorphic transformation) instead of a single vector, and this idea is termed as diffeomorphic PIV. Specifically, a deformation field is introduced to describe the particle displacement, i.e., we try to find the optimal velocity field, of which the corresponding deformation vector field agrees with the particle displacement. Because the variation of the deformation function can be approximated with the variation of the velocity function, the diffeomorphic PIV can be implemented as iterative PIV. That says, the diffeomorphic PIV warps the images with deformation vector field instead of the velocity, and keeps the rest as same as iterative PIVs. Two diffeomorphic deformation schemes -- forward diffeomorphic deformation interrogation (FDDI) and central diffeomorphic deformation interrogation (CDDI) -- are proposed. Tested on synthetic images, the FDDI achieves significant accuracy improvement across different one-pass displacement estimators (cross-correlation, optical flow, deep learning flow). Besides, the results on three real PIV image pairs demonstrate the non-negligible curvature effect for CDI-based PIV, and our FDDI provides larger velocity estimation (more accurate) in the fast curvy streamline areas. The accuracy improvement of the combination of FDDI and accurate dense estimator means that our diffeomorphic PIV paves a new way for complex flow measurement.
description: Preprint, under review
Privacy and Confidentiality in Process Mining -- Threats and Research Challenges
Creators: name: Elkoumy, Gamal
name: Fahrenkrog-Petersen, Stephan A.
name: Sani, Mohammadreza Fani
name: Koschmider, Agnes
name: Mannhardt, Felix
name: von Voigt, Saskia Nuñez
name: Rafiei, Majid
name: von Waldthausen, Leopold
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Privacy and confidentiality are very important prerequisites for applying process mining in order to comply with regulations and keep company secrets. This paper provides a foundation for future research on privacy-preserving and confidential process mining techniques. Main threats are identified and related to an motivation application scenario in a hospital context as well as to the current body of work on privacy and confidentiality in process mining. A newly developed conceptual model structures the discussion that existing techniques leave room for improvement. This results in a number of important research challenges that should be addressed by future process mining research.
description: Accepted for publication in ACM Transactions on Management Information Systems
A study of the (m,d,N)=(1,3,2) Lifshitz point and of the three- dimensional XY universality class by high-temperature bivariate series for the XY models with anisotropic competing interactions
Creators: name: Butera, P.
name: Pernici, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: High-temperature bivariate expansions have been derived for the two-spin correlation-function in a variety of classical lattice XY (planar rotator) models in which spatially isotropic interactions among first-neighbor spins compete with spatially isotropic or anisotropic (in particular uniaxial) interactions among next-to-nearest-neighbor spins. The expansions, calculated for cubic lattices of dimension d=1,2 and 3, are expressed in terms of the two variables K1=J1/kT and K2=J2/kT, where J1 and J2 are the nearest-neighbor and the next-to-nearest-neighbor exchange couplings, respectively. This report deals in particular with the properties of the d=3 uniaxial XY model (ANNNXY model) for which the bivariate expansions have been computed through the 18-th order, thus extending by 12 orders the results so far available and making a study of this model possible over a wide range of values of the competition parameter R=J2/J1.
description: Latex, 30 pages, 10 figures
title: Front Matter, Table of Contents, Preface, Committee
Creators: name: Reineke, Jan
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2017
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Committee

description: Front Matter, Table of Contents, Preface, Committee
description: OASIcs, Vol. 57, 17th International Workshop on Worst-Case Execution Time Analysis (WCET 2017), pages 0:i-0:x
Ionization Cone in the X-ray Binary LMC X-1
Creators: name: Cooke, R.
name: Bland-Hawthorn, J.
name: Sharp, R.
name: Kuncic, Z.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In an earlier paper, we presented the first evidence for a bow-shock nebula surrounding the X-ray binary LMC X-1 on a scale of ~15 pc, which we argued was powered by a jet associated with an accretion disk. We now present the first evidence for an ionization cone extending from an X-ray binary, a phenomenon only seen to date in active galactic nuclei (AGN). The ionization cone, detected in the HeII4686/Hbeta and [OIII]5007/Hbeta line ratio maps, aligns with the direction of the jet inferred from the bow-shock nebula. The cone has an opening angle ~45 deg and radial extent ~3.8 pc. Since the HeII emission cannot be explained by the companion O star, the gas in the ionization cone must be exposed to the `naked' accretion disk, thereby allowing us to place constraints on the unobservable ionizing spectrum. The energetics of the ionization cone give unambiguous evidence for an "ultraviolet - soft X-ray" (XUV) excess in LMC X-1. Any attempt to match the hard X-ray spectrum (>1keV) with a conventional model of the accretion disk fails to account for this XUV component. We propose two likely sources for the observed anisotropy: (1) obscuration by a dusty torus, or (2) a jet-blown hole in a surrounding envelope of circumstellar absorbing material. We discuss the implications of our discovery in the context of the mass-scaling hypothesis for accretion onto black holes and suggest avenues for future research.
description: 4 pages, 4 figures, accepted for publication in ApJ Letters
Learning-based pose edition for efficient and interactive design
Creators: name: Victor, Léon
name: Meyer, Alexandre
name: Bouakaz, Saïda
Publisher: name: arXiv
Year: 2021
Subjects: subject: Graphics (cs.GR)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Authoring an appealing animation for a virtual character is a challenging task. In computer-aided keyframe animation artists define the key poses of a character by manipulating its underlying skeletons. To look plausible, a character pose must respect many ill-defined constraints, and so the resulting realism greatly depends on the animator's skill and knowledge. Animation software provide tools to help in this matter, relying on various algorithms to automatically enforce some of these constraints. The increasing availability of motion capture data has raised interest in data-driven approaches to pose design, with the potential of shifting more of the task of assessing realism from the artist to the computer, and to provide easier access to nonexperts. In this article, we propose such a method, relying on neural networks to automatically learn the constraints from the data. We describe an efficient tool for pose design, allowing na{ï}ve users to intuitively manipulate a pose to create character animations.
title: Front Matter, Table of Contents, Preface, Organization
Creators: name: D'Angelo, Gianlorenzo
name: Dollevoet, Twan
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2017
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Organization

description: Front Matter, Table of Contents, Preface, Organization
description: OASIcs, Vol. 59, 17th Workshop on Algorithmic Approaches for Transportation Modelling, Optimization, and Systems (ATMOS 2017), pages 0:i-0:x
Modulation instability of Kerr optical frequency combs in dual-coupled optical cavities
Creators: name: Zhu, Enxu
name: Zhao, Chaoying
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Kerr optical frequency combs generated in a coherently driven Kerr nonlinear resonator has the potential for a wide range of applications. However, in a single cavity which is a widely adopted configuration for Kerr optical frequency combs generation, modulation instability is suppressed in normal dispersion regime and the pump-to-comb conversion efficiency is extremely low for a single dissipative Kerr soliton in anomalous dispersion regime. Dual-coupled cavities have been proposed to generate Kerr optical frequency combs in normal dispersion regime, and have potential to remarkably increase conversion efficiency for Kerr optical frequency combs. Here, we investigate modulation instability and Kerr optical frequency-comb formation in dual-coupled cavities. Based on solutions of the continuous-wave steady state, we obtain a quadric algebraic equation describing the modulation instability gain, and we find that it is intensely influenced by the group velocity mismatch between the two cavities. Our numerical simulations demonstrate that platicons can be generated via pump scanning scheme for the case that both the two cavities possess normal dispersion, and a single dissipative Kerr soliton can be generated in the cavity with anomalous dispersion while the dispersion of the other cavity is normal. Our analysis of modulation instability provides a powerful tool for Kerr optical frequency-comb generation via pump modulation and cavity detuning tuning scheme in dual-coupled cavities.
description: 9 pages, 6 figures, 68 references
A DMI guide to magnets micro-world
Creators: name: Mazurenko, V. V.
name: Kvashnin, Y. O.
name: Lichtenstein, A. I.
name: Katsnelson, M. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Dzyaloshinskii-Moriya interaction, DMI in short, represents an antisymmetric type of magnetic interactions that favour orthogonal orientation of spins and competes with Heisenberg exchange. Being introduced to explain weak ferromagnetism in antiferromagnets without an inversion center between magnetic atoms such an anisotropic interaction can be used to analyze other non-trivial magnetic structures of technological importance including spin spirals and skyrmions. Despite the fact that the corresponding DMI contribution to the magnetic energy of the system has a very compact form of the vector product of spins, the determination of DMI from first-principles electronic structure is a very challenging methodological and technical problem whose solution opens a door into the fascinating microscopic world of complex magnetic materials. In this paper we review a few such methods developed by us for calculating DMI and their applications to study the properties of real materials.
description: Contribution for the JETP special issue in honor of I.E. Dzyaloshinskii's 90th birthday
The dyonic picture of topological objects in the deconfined phase
Creators: name: Bornyakov, V. G.
name: Ilgenfritz, E. -M.
name: Martemyanov, B. V.
name: Muller-Preussker, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In the deconfinement phase of quenched SU(2) Yang-Mills theory the spectrum and localization properties of the eigenmodes of the overlap Dirac operator with antiperiodic boundary conditions are strongly dependent on the sign of the average Polyakov loop, $$. For $ > 0$ a gap appears with only few, highly localized topological zero and near-zero modes separated from the rest of the spectrum. Instead of a gap, for $ < 0$ a high spectral density of relatively delocalized near-zero modes is observed. In an ensemble of positive $$, the same difference of the spectrum appears under a change of fermionic boundary conditions. We argue that this effect and other properties of near-zero modes can be explained through the asymmetric properties and the different abundance of dyons and antidyons -- topological objects also known to appear, however in a symmetric form, in the confinement phase at $T < T_c$ as constituents of calorons with maximally nontrivial holonomy.
description: 12 pages, 7 figures. Clarifying changes in the introduction, no results changed; data added, 1 figure added, last changes to match article in Phys.Rev. D
Federated Learning for COVID-19 Detection with Generative Adversarial Networks in Edge Cloud Computing
Creators: name: Nguyen, Dinh C.
name: Ding, Ming
name: Pathirana, Pubudu N.
name: Seneviratne, Aruna
name: Zomaya, Albert Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Cryptography and Security (cs.CR)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: COVID-19 has spread rapidly across the globe and become a deadly pandemic. Recently, many artificial intelligence-based approaches have been used for COVID-19 detection, but they often require public data sharing with cloud datacentres and thus remain privacy concerns. This paper proposes a new federated learning scheme, called FedGAN, to generate realistic COVID-19 images for facilitating privacy-enhanced COVID-19 detection with generative adversarial networks (GANs) in edge cloud computing. Particularly, we first propose a GAN where a discriminator and a generator based on convolutional neural networks (CNNs) at each edge-based medical institution alternatively are trained to mimic the real COVID-19 data distribution. Then, we propose a new federated learning solution which allows local GANs to collaborate and exchange learned parameters with a cloud server, aiming to enrich the global GAN model for generating realistic COVID-19 images without the need for sharing actual data. To enhance the privacy in federated COVID-19 data analytics, we integrate a differential privacy solution at each hospital institution. Moreover, we propose a new blockchain-based FedGAN framework for secure COVID-19 data analytics, by decentralizing the FL process with a new mining solution for low running latency. Simulations results demonstrate the superiority of our approach for COVID-19 detection over the state-of-the-art schemes.
description: Accepted at IEEE Internet of Things Journal, 14 pages
Finite-size effects in the superconformal beta-deformed N=4 SYM
Creators: name: Fiamberti, F.
name: Santambrogio, A.
name: Sieg, C.
name: Zanon, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study finite size effects for composite operators in the SU(2) sector of the superconformal beta-deformed N=4 SYM theory. In particular we concentrate on the spectrum of one single magnon. Since in this theory one-impurity states are non BPS we compute their anomalous dimensions including wrapping contributions up to four loops and discuss higher order effects.
description: LaTeX, mpost, feynmf, 20 pages, 4 figures, 5 tables; v2: references added, equations (4.13) and (4.17) corrected
Doping Dependence of Superconductivity and Lattice Constants in Hole Doped $La_{1-x}Sr_xFeAsO$
Creators: name: Mu, Gang
name: Fang, Lei
name: Yang, Huan
name: Zhu, Xiyu
name: Cheng, Peng
name: Wen, Hai-Hu
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: By using solid state reaction method we have fabricated the hole doped $La_{1-x}Sr_xFeAsO$ superconductors with Sr content up to 0.13. It is found that the sharp anomaly at about 150 K and the low temperature upturn of resistivity are suppressed by doping holes into the parent phase. Interestingly both the superconducting transition temperature $T_c$ and the lattice constants (a-axis and c-axis) increase monotonously with hole concentration, in sharp contrast with the electron doped side where the $T_c$ increases with a continuing shrinkage of the lattice constants either by dope more fluorine or oxygen vacancies into the system. Our data clearly illustrate that the superconductivity can be induced by doping holes via substituting the trivalent La with divalent Sr in the LaFeAsO system with single FeAs layer, and the $T_c$ in the present system exhibits a symmetric behavior at the electron and hole doped sides, as we reported previously.
description: 4 pages, 5 figures
Shell-model calculations and realistic effective interactions
Creators: name: Coraggio, L.
name: Covello, A.
name: Gargano, A.
name: Itaco, N.
name: Kuo, T. T. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A review is presented of the development and current status of nuclear shell-model calculations in which the two-body effective interaction is derived from the free nucleon-nucleon potential. The significant progress made in this field within the last decade is emphasized, in particular as regards the so-called V-low-k approach to the renormalization of the bare nucleon-nucleon interaction. In the last part of the review we first give a survey of realistic shell-model calculations from early to present days. Then, we report recent results for neutron-rich nuclei near doubly magic 132Sn and for the whole even-mass N=82 isotonic chain. These illustrate how shell-model effective interactions derived from modern nucleon-nucleon potentials are able to provide an accurate description of nuclear structure properties.
description: 71 pages, to be published in Progress in Particle and Nuclear Physics
First Measurement of the $B(E2; 3/2^- \rightarrow 1/2^-)$ Transition Strength in $^7$Be: Testing Ab Initio Predictions for $A=7$ Nuclei
Creators: name: Henderson, S. L.
name: Ahn, T.
name: Caprio, M. A.
name: Fasano, P. J.
name: Simon, A.
name: Tan, W.
name: O'Malley, P.
name: Allen, J.
name: Bardayan, D. W.
name: Blankstein, D.
name: Frentz, B.
name: Hall, M. R.
name: Kolata, J. J.
name: McCoy, A. E.
name: Moylan, S.
name: Reingold, C. S.
name: Strauss, S. Y.
name: Torres-Isea, R. O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Electromagnetic observables are able to give insight into collective and emergent features in nuclei, including nuclear clustering. These observables also provide strong constraints for ab initio theory, but comparison of these observables between theory and experiment can be difficult due to the lack of convergence for relevant calculated values, such as $E2$ transition strengths. By comparing the ratios of $E2$ transition strengths for mirror transitions, we find that a wide range of ab initio calculations give robust and consistent predictions for this ratio. To experimentally test the validity of these ab initio predictions, we performed a Coulomb excitation experiment to measure the $B(E2; 3/2^- \rightarrow 1/2^-)$ transition strength in $^7$Be for the first time. A $B(E2; 3/2^- \rightarrow 1/2^-)$ value of $26(6)(3) \, e^2 \mathrm{fm}^4$ was deduced from the measured Coulomb excitation cross section. This result is used with the experimentally known $^7$Li $B(E2; 3/2^- \rightarrow 1/2^-)$ value to provide an experimental ratio to compare with the ab initio predictions. Our experimental value is consistent with the theoretical ratios within $1 σ$ uncertainty, giving experimental support for the value of these ratios. Further work in both theory and experiment can give insight into the robustness of these ratios and their physical meaning.
description: 9 pages, 7 figures
A trajectory-based understanding of quantum interference
Creators: name: Sanz, A. S.
name: Miret-Artes, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Interference is one of the most fundamental features which characterizes quantum systems. Here we provide an exhaustive analysis of the interfere dynamics associated with wave-packet superpositions from both the standard quantum-mechanical perspective and the Bohmian one. From this analysis, clear and insightful pictures of the physics involved in this kind of processes are obtained, which are of general validity (i.e., regardless of the type of wave packets considered) in the understanding of more complex cases where interference is crucial (e.g., scattering problems, slit diffraction, quantum control scenarios or, even, multipartite interactions). In particular, we show how problems involving wave-packet interference can be mapped onto problems of wave packets scattered off potential barriers.
description: 27 pages, 12 figures (shortened version)
Bragg spectroscopy of a strongly interacting Fermi gas
Creators: name: Veeravalli, G.
name: Kuhnle, E.
name: Dyke, P.
name: Vale, C. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present a comprehensive study of the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover in fermionic $^6$Li using Bragg spectroscopy. A smooth transition from molecular to atomic spectra is observed with a clear signature of pairing at and above unitarity. These spectra probe the dynamic and static structure factors of the gas and provide a direct link to two-body correlations. We have characterised these correlations and measured their density dependence across the broad Feshbach resonance at 834 G.
description: Replaced with published version
Cluster density slopes from Dark Matter-Baryons Energy Transfer
Creators: name: Del Popolo, Antonino
name: Delliou, Morgan Le
name: Deliyergiyev, Maksym
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this paper, we extend previous works on the relation between mass and the inner slope in dark matter density profiles. We calculate that relation in the mass range going from dwarf galaxies to cluster of galaxies. This was done thanks to a modeling of energy transfer via SN and AGN feedback, as well as via dynamical friction of baryon clumps. We show that, in the mass range above galaxy masses (Groups and clusters), the inner slope-mass relation changes its trend. It flattens (towards less cuspy profile) around masses corresponding to groups of galaxies and steepens again for large galaxy cluster masses. The flattening is produced by the AGN outflows (AGN feedback). The one-$ σ$ scatter on $α$ is approximately constant in all the mass range ($Δα\simeq 0.3$). This is the first paper extending the inner density profile slope-mass relationship to clusters of galaxies, accounting for the role of baryons. The result can be used to obtain a complete density profile, also taking baryons into account. Such kind of density profile was previously only available for galaxies.
description: 13pp, 2 figs, Published in: Phys.Dark Univ. 33 (2021) 100847
EOSC-Pillar D4.1 Legal and Policy Framework and Federation Blueprint
Creators: name: Foggetti, Nadina
name: Gerin Laslier, Maryvonne
name: Di Giorgio, Sara
name: Haile Gebreyesus, Netsanet
name: Müller, Sabine
name: van Nieuwerburgh, Inge
name: Romier, Geneviève
name: Van Wezel, Jos
Publisher: name: Zenodo
Year: 2021
Subjects: EOSC
Open Science
Europe
Research

description: Development of EOSC is influenced by the parallel development at the national and regional levels. Requirements for open data, data protection and cross border data access rely on a common understanding of existing regulations procedures in countries and their differences. This deliverable presents the legal and organisational aspects of services delivery in a federated environment and recommends actions that enable service providers to position their services for improved interoperation in the context of the EOSC services landscape. The objectives of this deliverable are: a study of the legal and policy state of the art in the involved countries, highlighting commonalities to be leveraged and gaps or challenges to be tackled in order to help harmonise and improve the national policies and strategies related to FAIR data and Open Science, proposing recommendations for the rules and procedures with respect to legal issues regarding open access and open data, proposing policy recommendations for services management, focusing on the management of service level agreements, and delivering a blueprint for EOSC which can be used by service providers as a guideline for legal aspects of service and data provisioning in a European and an international context The document sketches a policy and legal framework by building upon the existing national policies, delivers recommendations, and considers the aspects that come with agreement on service delivery in a federated IT landscape. These can help to establish a governance structure for service providers and other organisations that handle scientific data.
Airbus A380 : ein Nachruf
Creators: name: Scholz, Dieter
Publisher: name: HAW Hamburg
Year: 2022
Subjects: subject: Luftfahrt
subject: Luftfahrzeug
subject: Flugzeug
subject: Frachtflugzeug
subject: Flugplatz
subject: Startbahn
subject: Landebahn
subject: Flugbetrieb
subject: Wirbelschleppe
subject: Tragflügel
subject: Airbus
subject: Airbus 380
subject: Naturschutz
subject: Enteignung
subject: Life-Cycle Assessment
subject: LCA
subject: S-LCA
subject: UNEP
subject: Werkserweiterung
subject: Hamburg
subject: Hamburg-Finkenwerder
subject: Elbe
subject: Mühlenberger Loch
subject: HFB
subject: Neuenfelde
subject: Finkenwerder
subject: Deich
subject: Natur
subject: Aeronautics
subject: Airplanes
subject: Airports
subject: Runways (Aeronautics)
subject: Airports—Planning
subject: Conservation of natural resources
subject: nature
subject: protection
subject: expropriation
subject: wake vortex
subject: jet blast
subject: Bevölkerung
subject: Gesellschaft
subject: Arbeiter
subject: Luftverkehrsgesellschaft
subject: Zulieferer
subject: Anleger
subject: Staat
subject: Regierung
subject: Hersteller
subject: OEM
subject: stakeholders
subject: 620: Ingenieurwissenschaften

description: Zweck – Das Projekt zum Flugzeugtyp Airbus A380 ist mit der letzten Auslieferung Ende 2021 zu einem gewissen Abschluss gekommen. Zeit für einen kritischen Rückblick und ein Resümee auch jenseits der üblichen Berichterstattung. --- Methodik – Neben technischen Betrachtungen (Startstrecke, Wirbelschleppe u. a.) werden die Interessensgruppen (stakeholders) betrachtet. Dies entspricht dem Ansatz einer Social Life-Cycle-Assessment (S-LCA) nach dem Umweltprogramm der Vereinten Nationen (UNEP). Eine übliche Recherche wird ergänzt durch die Befragung von Zeitzeugen. --- Ergebnisse – Einzelne Interessensgruppen hatten massiv unter dem A380-Programm zu leiden. Dies waren Teile der lokalen Bevölkerung und die Gesellschaft (Steuerzahler), aber auch die Airlines, Flughäfen, Zulieferer und Anleger. Zufrieden oder sogar begeistert waren hingegen Arbeiter und Angestellte sowie die Passagiere. --- Grenzen der Anwendbarkeit – Die Aussagen zur Technik des Flugzeugs werden durch Daten und Rechnungen belegt. Die gesellschaftlichen Auswirkungen des A380-Projektes werden hingegen nur qualitativ betrachtet. --- Bedeutung in der Praxis – Um aus der Geschichte zu lernen muss diese recherchiert und analysiert werden. Ein ehrlicher Dialog sollte rechtzeitig mit allen Interessensgruppe geführt werden. --- Soziale Bedeutung – Eine fundierte Argumentation kann von der Gegenseite ignoriert werden, ist aber Bedingung für einen gesellschaftlichen Verhandlungserfolg. --- Wert – Für eine ähnliche Situation, in der ein Flugzeugprojekt massiv Ressourcen von der Gesellschaft einfordert, kann dieser Bericht eine Argumentationshilfe bieten.
An investigation of the relationship between sex of the counsellor, sex of the client, and empathy
Creators: name: Hunt, Alfred Ian
Publisher: name: University of British Columbia
Year: 2010

description: The relationship between empathy and sex similarity of counsellors and clients was investigated in this study. Two objectives were advanced to determine: (a) if counsellors of moderate or low empathic ability were more empathic with clients of the opposite sex, and (b) if counsellors of high empathic ability could be equally empathic with clients of both sexes. The subjects were 96 Caucasian University of British Columbia students enrolled in education or counselling psychology, or volunteering at a campus crisis and information centre. They were tested on the Discrimination Empathy Test, a lU item, sexually unbiased revision of Carkhuff's (1969) Index of Discrimination. Their scores were ranked and the subjects designated as of high, medium, or low empathic ability. This designation and the sex of the subjects and the clients served as independent variables. The dependent variable was empathy, defined as the discrimination of client affect. It was measured by the Affective Sensitivity Scale, an empathy measuring instrument consisting of video-taped vignettes from real counselling sessions with clients of both sexes and a written scale on which the subjects recorded their empathic response. Seven null hypotheses were advanced and analysed by a three-way analysis of variance. Only two of the hypotheses were not rejected. Females were found to be more empathic than males, and subjects were more empathic with male than female video-taped clients. For the third main effect, it was found that the three designated levels of empathic ability were not significantly different when re-tested on the Affective Sensitivity Scale. Nonsignificant results were found in interaction analyses of the three independent variables. Speculation was offered to explain these results. The lack of significant differences between the levels of empathic ability was probably responsible for the nonsignificance of three of the four interactions. The fourth, the finding of no interaction between the sex of the subjects and the sex of the video-taped clients could have been produced whether or not similarity was an important factor. The findings of additional t tests between each subject/video-taped client match by sex did not clarify any further the role of similarity. The highest mean score for the matches was for female subjects/ male video-taped clients, followed, in order, by male subjects/male videotaped clients, female subjects/female video-taped clients, and male subjects/ female video-taped clients. The same sex matches were not significantly different. Further research was recommended, especially into the relation of similarity to empathy.
ETF Risk Models
Creators: name: Kakushadze, Zura
name: Yu, Willie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Risk Management (q-fin.RM)
subject: Portfolio Management (q-fin.PM)
subject: FOS: Economics and business

description: We discuss how to build ETF risk models. Our approach anchors on i) first building a multilevel (non-)binary classification/taxonomy for ETFs, which is utilized in order to define the risk factors, and ii) then building the risk models based on these risk factors by utilizing the heterotic risk model construction of https://ssrn.com/abstract=2600798 (for binary classifications) or general risk model construction of https://ssrn.com/abstract=2722093 (for non-binary classifications). We discuss how to build an ETF taxonomy using ETF constituent data. A multilevel ETF taxonomy can also be constructed by appropriately augmenting and expanding well-built and granular third-party single-level ETF groupings.
description: 20 pages; to appear in Bulletin of Applied Economics (in press)
Diversity-induced resonance in a system of globally coupled linear oscillators
Creators: name: Toral, Raul
name: Hernandez-Garcia, Emilio
name: Gunton, James D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The purpose of this paper to analyze in some detail the arguably simplest case of diversity-induced reseonance: that of a system of globally-coupled linear oscillators subjected to a periodic forcing. Diversity appears as the parameters characterizing each oscillator, namely its mass, internal frequency and damping coefficient are drawn from a probability distribution. The main ingredients for the diversity-induced-resonance phenomenon are present in this system as the oscillators display a variability in the individual responses but are induced, by the coupling, to synchronize their responses. A steady state solution for this model is obtained. We also determine the conditions under which it is possible to find a resonance effect.
description: Reported at the XI International Workshop "Instabilities and Nonequilibrium Structures" Vina del Mar (Chile)