cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Novel wall-crossing behaviour in rank one $\mathcal{N}=2^*$ gauge theory
Creators: name: Rüter, Philipp
name: Szabo, Richard J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study the BPS spectrum of four-dimensional $\mathcal{N}=2$ supersymmetric Yang-Mills theory with gauge group $SU(2)$ and a massive adjoint hypermultiplet, which has an extremely intricate structure with infinite spectrum in all chambers of its Coulomb moduli space, and is not well understood. We build on previous results by employing the BPS quiver description of the spectrum, and explore the qualitative features in detail using numerical techniques. We find novel and unexpected behaviour in the form of wall-crossings involving interactions between BPS particles with negative electric-magnetic pairings, which we interpret in terms of the reverse orderings of the usual wall-crossing formulas for rank one $\mathcal{N}=2$ field theories. This identifies new a priori unrelated states in the spectrum.
description: 52 pages, 19 figures, 2 tables
Canadian Gallup Poll # 517-1
Creators: name: Inc., The Canadian Gallup Poll
Publisher: name: Roper Center for Public Opinion Research
Year: 2022

description: Federal elections vote intent(1); past federal elections vote(1); firearms(2); South Africa's racial policies(5); greatest threat to Canada: big business, labor or government(1); opinion on major political parties(3). Note: Standard demographics(17).
Ehlers symmetry at the next derivative order
Creators: name: Colonnello, Claudia
name: Kleinschmidt, Axel
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyse four-dimensional gravity in the presence of general curvature squared corrections and show that Ehlers' SL(2,R) symmetry, which appears in the reduction of standard gravity to three dimensions, is preserved by the correction terms. The mechanism allowing this is a correction of the SL(2,R) transformation laws which resolves problems with the different scaling behaviour of various terms occurring in the reduction.
description: 13 pages. v2: updated reference
The Global Meteor Network -- Methodology and First Results
Creators: name: Vida, Denis
name: Šegon, Damir
name: Gural, Peter S.
name: Brown, Peter G.
name: McIntyre, Mark J. M.
name: Dijkema, Tammo Jan
name: Pavletić, Lovro
name: Kukić, Patrik
name: Mazur, Michael J.
name: Eschman, Peter
name: Roggemans, Paul
name: Merlak, Aleksandar
name: Zubović, Dario
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Global Meteor Network (GMN) utilizes highly sensitive low-cost CMOS video cameras which run open-source meteor detection software on Raspberry Pi computers. Currently, over 450 GMN cameras in 30 countries are deployed. The main goal of the network is to provide long-term characterization of the radiants, flux, and size distribution of annual meteor showers and outbursts in the optical meteor mass range. The rapid 24-hour publication cycle the orbital data will enhance the public situational awareness of the near-Earth meteoroid environment. The GMN also aims to increase the number of instrumentally observed meteorite falls and the transparency of data reduction methods. A novel astrometry calibration method is presented which allows decoupling of the camera pointing from the distortion, and is used for frequent pointing calibrations through the night. Using wide-field cameras ($88^{\circ}\times48^{\circ}$) with a limiting stellar magnitude of $+6.0 \pm 0.5$ at 25 frames per second, over 220,000 precise meteoroid orbits were collected since December 2018 until June 2021. The median radiant precision of all computed trajectories is $0.47^{\circ}$, $0.32^{\circ}$ for $\sim20\%$ of meteors which were observed from 4+ stations, a precision sufficient to measure physical dispersions of meteor showers. All non-daytime annual established meteor showers were observed during that time, including five outbursts. An analysis of a meteorite-dropping fireball is presented which showed visible wake, fragmentation details, and several discernible fragments. It had spatial trajectory fit errors of only ~40 m, which translated into the estimated radiant and velocity errors of 3 arc minutes and tens of meters per second.
description: Accepted for publication in MNRAS, 30 pages, 31 figures
Magnetism and superconductivity in the $t{-}t^\prime{-}J$ model
Creators: name: Spanu, Leonardo
name: Lugas, Massimo
name: Becca, Federico
name: Sorella, Sandro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present a systematic study of the phase diagram of the $t{-}t^\prime{-}J$ model by using the Green's function Monte Carlo (GFMC) technique, implemented within the fixed-node (FN) approximation and a wave function that contains both antiferromagnetic and d-wave pairing. This enables us to study the interplay between these two kinds of order and compare the GFMC results with the ones obtained by the simple variational approach. By using a generalization of the forward-walking technique, we are able to calculate true FN ground-state expectation values of the pair-pair correlation functions. In the case of $t^\prime=0$, there is a large region with a coexistence of superconductivity and antiferromagnetism, that survives up to $δ_c \sim 0.10$ for $J/t=0.2$ and $δ_c \sim 0.13$ for $J/t=0.4$. The presence of a finite $t^\prime/t<0$ induces a strong suppression of both magnetic (with $δ_c \lesssim 0.03$, for $J/t=0.2$ and $t^\prime/t=-0.2$) and pairing correlations. In particular, the latter ones are depressed both in the low-doping regime and around $δ\sim 0.25$, where strong size effects are present.
description: 10 pages, 9 figures
Gravitational-Wave Extraction from Neutron Star Oscillations: comparing linear and nonlinear techniques
Creators: name: Baiotti, Luca
name: Bernuzzi, Sebastiano
name: Corvino, Giovanni
name: De Pietri, Roberto
name: Nagar, Alessandro
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The main aim of this study is the comparison of gravitational waveforms obtained from numerical simulations which employ different numerical evolution approaches and different wave-extraction techniques. For this purpose, we evolve an oscillating, non-rotating polytropic neutron-star model with two different approaches: a full nonlinear relativistic simulation (in three dimensions) and a linear simulation based on perturbation theory. The extraction of the gravitational-wave signal is performed with three methods: The gauge-invariant curvature-perturbation theory based on the Newman-Penrose scalar $ψ_4$; The gauge-invariant Regge-Wheeler-Zerilli-Moncrief metric-perturbation theory of a Schwarzschild space-time; Some generalization of the quadrupole emission formula.
description: 27 pages, 18 figures. Published in Phys. Rev. D
A Numerical Investigation of Analyte Size Effects in Nanopore Sensing Systems
Creators: name: Szuttor, Kai
name: Kreissl, Patrick
name: Holm, Christian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the ionic current modulation in DNA nanopore translocation setups by numerically solving the electrokinetic mean-field equations for an idealized model. Specifically, we study the dependence of the ionic current on the relative length of the translocating molecule. Our simulations show a significantly smaller ionic current for DNA molecules that are shorter than the pore at low salt concentrations. These effects can be ascribed to the polarization of the ion cloud along the DNA that leads to an opposing electric dipole field. Our results for DNA shine light on the observed discrepancy between infinite pore models and experimental data on various sized DNA complexes.
Broadband electrically detected magnetic resonance of phosphorus donors in a silicon field-effect transistor
Creators: name: van Beveren, L. H. Willems
name: Huebl, H.
name: McCamey, D. R.
name: Duty, T.
name: Ferguson, A. J.
name: Clark, R. G.
name: Brandt, M. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report electrically detected magnetic resonance of phosphorus donors in a silicon field-effect transistor. An on-chip transmission line is used to generate the oscillating magnetic field allowing broadband operation. At milli-kelvin temperatures, continuous wave spectra were obtained up to 40 GHz, using both magnetic field and microwave frequency modulation. The spectra reveal the hyperfine-split electron spin resonances characteristic for Si:P and a central feature which displays the fingerprint of spin-spin scattering in the two-dimensional electron gas.
description: 4 pages, 4 figures, submitted to APL
Unsupervised learning-based structural analysis: Search for a characteristic low-dimensional space by local structures in atomistic simulations
Creators: name: Tamura, Ryo
name: Matsuda, Momo
name: Lin, Jianbo
name: Futamura, Yasunori
name: Sakurai, Tetsuya
name: Miyazaki, Tsuyoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Owing to the advances in computational techniques and the increase in computational power, atomistic simulations of materials can simulate large systems with higher accuracy. Complex phenomena can be observed in such state-of-the-art atomistic simulations. However, it has become increasingly difficult to understand what is actually happening and mechanisms, for example, in molecular dynamics (MD) simulations. We propose an unsupervised machine learning method to analyze the local structure around a target atom. The proposed method, which uses the two-step locality preserving projections (TS-LPP), can find a low-dimensional space wherein the distributions of datapoints for each atom or groups of atoms can be properly captured. We demonstrate that the method is effective for analyzing the MD simulations of crystalline, liquid, and amorphous states and the melt-quench process from the perspective of local structures. The proposed method is demonstrated on a silicon single-component system, a silicon-germanium binary system, and a copper single-component system.
description: 16 pages, 13 figures
Sixty Years of Element Abundance Measurements in Solar Energetic Particles
Creators: name: Reames, Donald V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Sixty years ago the first observation was published showing solar energetic particles (SEPs) with a sampling of chemical elements. Thus began study of the direct products of dynamic physics in the solar corona. As we have progressed from 4-min sounding-rocket samples to continuous satellite coverage of SEP events, we have extended the observations to the unusual distribution of element abundances throughout the periodic table. Small "impulsive" SEP events from islands of magnetic reconnection on open magnetic-field lines in solar jets generate huge enhancements in abundances of 3He and of the heaviest elements. Solar flares involve the same physics but there the SEPs are trapped on closed loops, expending their energy as heat and light. The larger, energetic "gradual" SEP events are accelerated at shock waves driven by fast, wide coronal mass ejections (CMEs). However, these shocks can also reaccelerate ions from pools of residual suprathermal impulsive ions, and CMEs from jets can also drive fast shocks, complicating the picture. The underlying element abundances in SEP events represent the solar corona, which differs from corresponding abundances in the photosphere as a function of the first ionization potential (FIP) of the elements, distinguishing low-FIP (<10 eV) ions from high-FIP neutral atoms as they expand through the chromosphere. Dependence of SEP acceleration upon A/Q allows best-fit estimation of ion Q-values and hence of the source plasma temperature of ~1 - 3 MK, derived from abundances, which correlates with recent measures of temperatures using extreme ultraviolet emission from jets. New questions arise, however, about the theoretical basis of correlations of energy-spectral indices with power-laws of abundances, about the coexistence of mechanisms for enhancements of 3He and of heavy elements, and about the overall paucity of C in FIP comparisons.
description: 30 pages, 11 figures, accepted for publication by Space Science Reviews
Counting Solutions for the N-queens and Latin Square Problems by Efficient Monte Carlo Simulations
Creators: name: Zhang, Cheng
name: Ma, Jianpeng
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We apply Monte Carlo simulations to count the numbers of solutions of two well-known combinatorial problems: the N-queens problem and Latin square problem. The original system is first converted to a general thermodynamic system, from which the number of solutions of the original system is obtained by using the method of computing the partition function. Collective moves are used to further accelerate sampling: swap moves are used in the N-queens problem and a cluster algorithm is developed for the Latin squares. The method can handle systems of $10^4$ degrees of freedom with more than $10^10000$ solutions. We also observe a distinct finite size effect of the Latin square system: its heat capacity gradually develops a second maximum as the size increases.
description: 10 pages, 4 figures
Protein mechanical unfolding: a model with binary variables
Creators: name: Imparato, A.
name: Pelizzola, A.
name: Zamparo, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: A simple lattice model, recently introduced as a generalization of the Wako--Saitô model of protein folding, is used to investigate the properties of widely studied molecules under external forces. The equilibrium properties of the model proteins, together with their energy landscape, are studied on the basis of the exact solution of the model. Afterwards, the kinetic response of the molecules to a force is considered, discussing both force clamp and dynamic loading protocols and showing that theoretical expectations are verified. The kinetic parameters characterizing the protein unfolding are evaluated by using computer simulations and agree nicely with experimental results, when these are available. Finally, the extended Jarzynski equality is exploited to investigate the possibility of reconstructing the free energy landscape of proteins with pulling experiments.
One Unique and Three New Seated Figures from Eastern Rough Cilicia
Creators: name: Mörel, Ahmet
Publisher: name: Deutsches Archäologisches Institut
Year: 2017
Subjects: subject: Cilicia
subject: Olbian Territory
subject: seated figures
subject: rock-cut relief
subject: Roman Imperial Period

description: Archäologischer Anzeiger, 2. Halbband 2015
description: The subject of this study, one rock-cut relief with a seated figure and three statues of seated figures, were found in the Olbian Territory. The rock relief and the three statues of seated figures, which are evaluated here for the first time, were found in surveys carried out around rural settlements. The rock-cut relief of the seated figure is situated in the Kaleboynu area of Çerçili village in Erdemli. The seated statues considered in this study were found in settlements that belong to Kümbetbeleni and Güvercinlik. When all the data are considered together it would be right to suggest that the free-standing seated statues from Kümbetbeleni and Güvercinlik and the rock-cut relief of the seated figure from Çerçili should be dated to the end of the 2nd cent. A.D. – beginning of the 3rd cent. A.D.
Regulator constants and the parity conjecture
Creators: name: Dokchitser, Tim
name: Dokchitser, Vladimir
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 11G05 (Primary), 11G07, 11G10, 11G40, 19A22, 20B99 (Secondary)

description: The p-parity conjecture for twists of elliptic curves relates multiplicities of Artin representations in p-infinity Selmer groups to root numbers. In this paper we prove this conjecture for a class of such twists. For example, if E/Q is semistable at 2 and 3, K/Q is abelian and K^\infty is its maximal pro-p extension, then the p-parity conjecture holds for twists of E by all orthogonal Artin representations of Gal(K^\infty/Q). We also give analogous results when K/Q is non-abelian, the base field is not Q and E is replaced by an abelian variety. The heart of the paper is a study of relations between permutation representations of finite groups, their "regulator constants", and compatibility between local root numbers and local Tamagawa numbers of abelian varieties in such relations.
description: 50 pages; minor corrections; final version, to appear in Invent. Math
Effective shell-model interaction for nuclei southeast of $^{100}$Sn
Creators: name: Sun, Z. H.
name: Hagen, G.
name: Jansen, G. R.
name: Papenbrock, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We construct an effective shell-model interaction for the valence space spanned by single-particle neutron and single-hole proton states in $^{100}$Sn. Starting from chiral nucleon-nucleon and three-nucleon forces and single-reference coupled-cluster theory for $^{100}$Sn we apply a second similarity transformation that decouples the valence space. The particle-particle components of the resulting effective interaction can be used in shell model calculations for neutron deficient tin isotopes. The hole-hole interaction can be used to calculate the $N = 50$ isotones south of $^{100}$Sn, and the full particle-hole interaction describes nuclei in the region southeast of $^{100}$Sn. We compute low-lying excited states in selected nuclei southeast of $^{100}$Sn, and find reasonable agreement with data. The presented techniques can also be applied to construct effective shell-model interactions for other regions of the nuclear chart.
description: 9 pages, 8 figures, interaction files in supplemental material
Strong Coupling Optomechanics Mediated by a Qubit in the Dispersive Regime
Creators: name: Aporvari, Ahmad Shafiei
name: Vitali, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Cavity optomechanics represents a flexible platform for the implementation of quantum technologies, useful in particular for the realization of quantum interfaces, quantum sensors and quantum information processing. However, the dispersive, radiation-pressure interaction between the mechanical and the electromagnetic modes is typically very weak, harnessing up to now the demonstration of interesting nonlinear dynamics and quantum control at the single photon level. It has already been shown both theoretically and experimentally that if the interaction is mediated by a Josephson circuit, one can have an effective dynamic corresponding to a huge enhancement of the single-photon optomechanical coupling. Here we analyze in detail this phenomenon in the general case when the cavity mode and the mechanical mode interact via an off-resonant qubit. Using a Schrieffer-Wolff approximation treatment, we determine the regime where this tripartite hybrid system behaves as an effective cavity optomechanical system in the strong coupling regime
description: 9 pages, 5 Figures
MECHANICAL CONSTRAINTS TO CELL CYCLE PROGRESSION IN A PSEUDOSTRATIFIED EPITHELIUM - NUMERICAL CODE
Creators: name: HECHT Sophie
Publisher: name: Zenodo
Year: 2022
Subjects: Interkinetic nuclear migration
Pseudostratified epithelium
Proliferation control

description: This folder contains the code related to the model presented in the paper: MECHANICAL CONSTRAINTS TO CELL CYCLE PROGRESSION IN A PSEUDOSTRATIFIED EPITHELIUM
Measuring the undetectable: Proper motions and parallaxes of very faint sources
Creators: name: Lang, Dustin
name: Hogg, David W.
name: Jester, Sebastian
name: Rix, Hans-Walter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The near future of astrophysics involves many large solid-angle, multi-epoch, multi-band imaging surveys. These surveys will, at their faint limits, have data on large numbers of sources that are too faint to be detected at any individual epoch. Here we show that it is possible to measure in multi-epoch data not only the fluxes and positions, but also the parallaxes and proper motions of sources that are too faint to be detected at any individual epoch. The method involves fitting a model of a moving point source simultaneously to all imaging, taking account of the noise and point-spread function in each image. By this method it is possible to measure the proper motion of a point source with an uncertainty close to the minimum possible uncertainty given the information in the data, which is limited by the point-spread function, the distribution of observation times (epochs), and the total signal-to-noise in the combined data. We demonstrate our technique on multi-epoch Sloan Digital Sky Survey imaging of the SDSS Southern Stripe. We show that we can distinguish very red brown dwarfs by their proper motions from very high-redshift quasars more than $1.6\mag$ fainter than with traditional technique on these SDSS data, and with better better fidelity than by multi-band imaging alone. We re-discover all 10 known brown dwarfs in our sample and present 9 new candidate brown dwarfs, identified on the basis of high proper motion.
description: AJ, in press
Approximate calculation of operator semigroups by perturbation of generators
Creators: name: Yurachkivsky, A.
name: Zhugayevych, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47D06 (Primary) 34G10, 34K06 (Secondary)

description: Let $Ω$ be an operator semigroup with generator $A$ in a sequentially complete locally convex topological vector space $E$. For a semigroup with generator $A+D$, where $D$ is a bounded linear operator on $E$, two integral equations are derived. A theorem on continuous dependence of a semigroup on its generator is proved. An application to random walk on $\mathbb{Z}$ is given.
description: 6 pages, no figures
Isocurvature fluctuations in Affleck-Dine mechanism and constraints on inflation models
Creators: name: Kasuya, Shinta
name: Kawasaki, Masahiro
name: Takahashi, Fuminobu
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We reconsider the Affleck-Dine mechanism for baryogenesis and show that the baryonic isocurvature fluctuations are generated in many inflation models in supergravity. The inflationary scale and the reheating temperature must satisfy certain constraints to avoid too large baryonic isocurvature fluctuations.
description: 18 pages, 1 figure
Limiter-based entropy stabilization of semi-discrete and fully discrete schemes for nonlinear hyperbolic problems
Creators: name: Kuzmin, Dmitri
name: Hajduk, Hennes
name: Rupp, Andreas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The algebraic flux correction (AFC) schemes presented in this work constrain a standard continuous finite element discretization of a nonlinear hyperbolic problem to satisfy relevant maximum principles and entropy stability conditions. The desired properties are enforced by applying a limiter to antidiffusive fluxes that represent the difference between the high-order baseline scheme and a property-preserving approximation of Lax--Friedrichs type. In the first step of the limiting procedure, the given target fluxes are adjusted in a way that guarantees preservation of local and/or global bounds. In the second step, additional limiting is performed, if necessary,to ensure the validity of fully discrete and/or semi-discrete entropy inequalities. The limiter-based entropy fixes considered in this work are applicable to finite element discretizations of scalar hyperbolic equations and systems alike. The underlying inequality constraints are formulated using Tadmor's entropy stability theory. The proposed limiters impose entropy-conservative or entropy-dissipative bounds on the rate of entropy production by antidiffusive fluxes and Runge--Kutta (RK) time discretizations. Two versions of the fully discrete entropy fix are developed for this purpose. To motivate the use of limiter-based entropy fixes, we prove a finite element version of the Lax--Wendroff theorem and perform numerical studies for standard test problems. In our numerical experiments, entropy-dissipative schemes converge to correct weak solutions of scalar conservation laws, of the Euler equations, and of the shallow water equations.
Gerontological knowledge and its role in the social production of agedness
Creators: name: Auger, Jeanette A.
Publisher: name: University of British Columbia
Year: 2010

description: Accepting the point of view put forward by those sociologists working within the framework known as the social construction of reality, the thesis attempts to describe and analyze the social production of the phenomenon of old age. Specifically, it attempts to examine the production of gerontologists — those who study and research aging as an occupation. It posits such constructions against views expressed by those considered "old." Ethnographic techniques of data collection, responses to questionnaires, audio tapes and a textual analysis of written documents, gathered over a six year period in a variety of social settings, provided materials which display that notions of aging are differentially constructed by gerontologists and the old. An interactive approach to aging is suggested in which the lives and experiences of the old become data for inquiry. The ideological base of gerontology is explored and the notion of "helping" the old is seen as an underlying organizational facet. How it is invoked as a resource to legitimize certain gerontological activities is described, analyzed, and compared with older persons' perceptions of themselves as being helped. The thesis argues that if gerontologists wish to help the aged through their research, consultative, teaching, and other activities, they are not succeeding in the most appropriate manner according to some older informants. The theories of gerontology are examined as examples of some of the ideological foci put forward by its practitioners. They are found to be lacking in both theoretical and practical aspects. The thesis concludes with a chapter on strategies for an appropriate gerontology using the contributions and criticisms of older persons and gerontologists. Recommendations are made as to how to render this field of inquiry more reflexive and useful to the old as service receivers as well as to members of the social sciences.
Magnon band structure of skyrmion crystals and stereographic projection approach
Creators: name: Timofeev, V. E.
name: Aristov, D. N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using semiclassical method combined with stereographic projection approach, we investigate the magnetic dynamics of the skyrmion crystal (SkX), formed in planar ferromagnet with both Dzyaloshinskii-Moriya interaction and uniform magnetic field. The topologically non-trivial ground state of SkX is described in stereographic projection by the complex valued function with simple poles at skyrmions' positions. We use the earlier proposed ansatz for this ground state function in the form of the sum of individual skyrmions. The dynamics follows from the second variation of the classical action. Numerical analysis yields the magnon band structure of tight-binding form in accordance with previously known results. There are two sets of bands, one set with a flat dispersion, topologically trivial and rapidly evolving with magnetic field. Another set is robust to magnetic field, characterized by pronounced dispersion and with the Berry curvature which may be sign-reversal in the Brillouin zone. The developed theory can be straightforwardly generalized for the analysis of magnetic dynamics in topological spin structures of other types.
Andreev bound states at a cuprate grain boundary junction: A lower bound for the upper critical field
Creators: name: Wagenknecht, M.
name: Koelle, D.
name: Kleiner, R.
name: Graser, S.
name: Schopohl, N.
name: Chesca, B.
name: Tsukada, A.
name: Goennenwein, S. T. B.
name: Gross, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate in-plane quasiparticle tunneling across thin film grain boundary junctions (GBJs) of the electron-doped cuprate La$_{2-x}$Ce$_{x}$CuO$_4$ in magnetic fields up to $B=16 $T, perpendicular to the CuO$_2$ layers. The differential conductance in the superconducting state shows a zero bias conductance peak (ZBCP) due to zero energy surface Andreev bound states. With increasing temperature $T$, the ZBCP vanishes at the critical temperature $T_c\approx29 $K if B=0, and at $T=12 $K for B=16 T. As the ZBCP is related to the macroscopic phase coherence of the superconducting state, we argue that the disappearance of the ZBCP at a field $B_{ZBCP}(T)$ must occur below the upper critical field $B_{c2}(T)$ of the superconductor. We find $B_{ZBCP}(0) \approx 25 $T which is at least a factor of 2.5 higher than previous estimates of $B_{c2}(0)$.
description: 4 pages, 4 figures
Unificación Cuántico-Relativista: Explicación de la Expansión Acelerada, Materia Oscura, Energía Oscura y Singularidades mediante Fluctuaciones Cuánticas
Creators: name: CORTÉS UTRERAS, RACHEL
Publisher: name: Zenodo
Year: 2024
Subjects: teoría cuantico-relativista,
expenasion acelerada
materia oscura
agujeros negros
energia oscura
fluctuaciones cuánticas del vacío
ecuaciones de campo de Eintein

description: Este trabajo presenta una teoría unificada cuántico-relativista que ofrece una explicación coherente de la expansión acelerada del universo, la materia oscura, la energía oscura y las singularidades de los agujeros negros. La teoría introduce fluctuaciones cuánticas del vacío en las ecuaciones de campo de Einstein. Simulaciones numéricas y comparaciones con observaciones empíricas respaldan las predicciones de la teoría.
IIITG-ADBU@HASOC-Dravidian-CodeMix-FIRE2020: Offensive Content Detection in Code-Mixed Dravidian Text
Creators: name: Baruah, Arup
name: Das, Kaushik Amar
name: Barbhuiya, Ferdous Ahmed
name: Dey, Kuntal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: This paper presents the results obtained by our SVM and XLM-RoBERTa based classifiers in the shared task Dravidian-CodeMix-HASOC 2020. The SVM classifier trained using TF-IDF features of character and word n-grams performed the best on the code-mixed Malayalam text. It obtained a weighted F1 score of 0.95 (1st Rank) and 0.76 (3rd Rank) on the YouTube and Twitter dataset respectively. The XLM-RoBERTa based classifier performed the best on the code-mixed Tamil text. It obtained a weighted F1 score of 0.87 (3rd Rank) on the code-mixed Tamil Twitter dataset.
Comunicar las catástrofes
Creators: name: Suing, Abel
Publisher: name: Zenodo
Year: 2022
Subjects: catástrofe
comunicación
emergencia
Ecuador
deslave
naturaleza
impacto
ambiente
Quito
luvia
Gazca
La Comuna

description: Publicación en la sección de opinión del diario digital hora 32 https://hora32.com.ec/ que se edita en Loja (Ecuador)
The wall shear rate distribution for flow in random sphere packings
Creators: name: Warren, Patrick B.
name: Stepanek, Frantisek
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The wall shear rate distribution P(gamma) is investigated for pressure-driven Stokes flow through random arrangements of spheres at packing fractions 0.1 <= phi <= 0.64. For dense packings, P(gamma) is monotonic and approximately exponential. As phi --> 0.1, P(gamma) picks up additional structure which corresponds to the flow around isolated spheres, for which an exact result can be obtained. A simple expression for the mean wall shear rate is presented, based on a force-balance argument.
description: 4 pages, 3 figures, 1 table, RevTeX 4; significantly revised with significantly extended scope
Equilibria and condensates in Rossby and drift wave turbulence
Creators: name: Skipp, Jonathan
name: Nazarenko, Sergey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We study the thermodynamic equilibrium spectra of the Charney- Hasegawa-Mima (CHM) equation in its weakly nonlinear limit. In this limit, the equation has three adiabatic invariants, in contrast to the two invariants of the 2D Euler or Gross-Pitaevskii equations, which are examples for comparison. We explore how the third invariant considerably enriches the variety of equilibrium spectra that the CHM system can access. In particular we characterise the singular limits of these spectra in which condensates occur, i.e. a single Fourier mode (or pair of modes) accumulate(s) a macroscopic fraction of the total invariants. We show that these equilibrium condensates provide a simple explanation for the characteristic structures observed in CHM systems of finite size: highly anisotropic zonal flows, large-scale isotropic vortices, and vortices at small scale. We show how these condensates are associated with combinations of negative thermodynamic potentials (viz. temperature).
Violence against intimates : toward a profile of the wife assaulter
Creators: name: Browning, James Joseph
Publisher: name: University of British Columbia
Year: 2010

description: Recent incidence statistics have confirmed the impressions of clinicians, transition house workers and police that wife assault is a widespread and serious social problem. The last decade has witnessed a flurry of theoretical papers, interview studies and broad survey research in the area. While these efforts have significantly advanced public awareness and knowledge about the problem, the majority of the research to date has suffered from methodological shortcomings such as lack of standardized measures, lack of comparison groups, and inattention to the offender. Since some evidence suggests that many of these men are violent in more than one relationship, the lack of knowledge about assaulter characteristics represents an important gap in the literature. This research project attempted to test a number of clinically-derived hypotheses about the wife assaulter and his relationship by directly examining a sample of eighteen assaultive husbands. The responses of these men were compared to those of eighteen verbally aggressive, nonviolent men and eighteen nonaggressive men matched for age and socioeconomic status. Paper and pencil measures were used to assess conflict tactics, marital adjustment, childhood exposure to violence, general and spouse-specific assertive communication, emotional expressiveness, attitudes toward women, and need for power. The men's reactions to videotaped couple conflict scenarios which varied power dynamics and attempted intimacy movement, were assessed via affect checklists and physiological measures (i.e. skin conductance, heart rate, respiration and pulse transit time). The men's reports of violence were corroborated by their wives. The results showed a remarkable similarity among the three groups of men overall. Some potentially interesting differences emerged in terms of the relevance of abandonment fear as an instigation to wife assault and in terms of differences in perceptions of violence between husband and wife. The overall results were compared with those of several well-designed studies on child abuse which indicate that many of the assumed characteristics of abusive families' are also shared by demographically similar nonabusive families. Suggestions for further substantive research are made based on the results of this project. Finally, a number of methodological recommendations are made including the need to develop a taxonomy of wife assaulters, the utility of collecting couple data, and the- necessity for a broad-based approach to theory and measurement in the area.
title: Bürgerbeteiligung in Stadtentwicklungsprozessen – Wundermittel oder Mogelpackung?
title: Civic participation – Miracle cure or bluff package?
Creators: name: Sackmann, Rosemarie
Publisher: name: Universität Würzburg
Year: 2014
Subjects: subject: 300 Sozialwissenschaften

description: Würzburger Arbeitspapiere zur Politikwissenschaft und Soziologie (WAPS); 5
Tkachenko modes in a superfluid Fermi gas at unitarity
Creators: name: Watanabe, Gentaro
name: Cozzini, Marco
name: Stringari, Sandro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We calculate the frequencies of the Tkachenko oscillations of a vortex lattice in a harmonically trapped superfluid Fermi gas. We use the elasto-hydrodynamic theory by properly accounting for the elastic constants, the Thomas-Fermi density profile of the atomic cloud, and the boundary conditions. Thanks to the Fermi pressure, which is responsible for larger cloud radii with respect to the case of dilute Bose-Einstein condensed gases, large vortex lattices are achievable in the unitary limit of infinite scattering length, even at relatively small angular velocities. This opens the possibility of experimentally observing vortex oscillations in the regime where the dispersion relation approaches the Tkachenko law for incompressible fluids and the mode frequency is almost comparable to the trapping frequencies.
description: 5 pages, 1 figure; minor changes, now published as Phys. Rev. A 77, 021602(R) (2008)
Solar Coronal Structures and Stray Light in TRACE
Creators: name: DeForest, C. E.
name: Martens, P. C. H.
name: Wills-Davey, M. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using the 2004 Venus transit of the Sun to constrain a semi-empirical point-spread function for the TRACE EUV solar telescope, we have measured the effect of stray light in that telescope. We find that 43% of 171A EUV light that enters TRACE is scattered, either through diffraction off the entrance filter grid or through other nonspecular effects. We carry this result forward, via known-PSF deconvolution of TRACE images, to identify its effect on analysis of TRACE data. Known-PSF deconvolution by this derived PSF greatly reduces the effect of visible haze in the TRACE 171A images, enhances bright features, and reveals that the smooth background component of the corona is considerably less bright (and hence much more rarefied) than commonly supposed. Deconvolution reveals that some prior conlclusions about the Sun appear to have been based on stray light in the images. In particular, the diffuse background "quiet corona" becomes consistent with hydrostatic support of the coronal plasma; feature contrast is greatly increased, possibly affecting derived parameters such as the form of the coronal heating function; and essentially all existing differential emission measure studies of small features appear to be affected by contamination from nearby features. We speculate on further implications of stray light for interpretation of EUV images from TRACE and similar instruments, and advocate deconvolution as a standard tool for image analysis with future instruments such as SDO/AIA.
description: Accepted by APJ; v2 reformatted to single-column format for online readability
title: The Matrix of Democracy: A Three-Dimensional Approach to Measuring the Quality of Democracy and Regime Transformations
title: Die Demokratiematrix: Ein dreidimensionaler Ansatz zur Messung der Qualität der Demokratie und von Regimetransformationen
Creators: name: Lauth, Hans-Joachim
Publisher: name: Universität Würzburg
Year: 2015
Subjects: subject: 321 Staatsformen und Regierungssysteme

description: Würzburger Arbeitspapiere zur Politikwissenschaft und Soziologie (WAPS); 6
title: Exploring Emerging India - Eight Essays
title: Exploring Emerging India - Acht Essays
Creators: name: Müller-Brandeck-Bocquet, Gisela
name: Gieg, Philipp
name: Lowinger, Timo
name: Gsänger, Matthias
name: Becker, Michael
name: Kundu, Amitabh
name: Valerian, Rodrigues
name: S, Shaji
name: Schömbucher-Kusterer, Elisabeth
name: Biswas, Aparajita
Publisher: name: Universität Würzburg
Year: 2015
Subjects: subject: 327 Internationale Beziehungen

description: Würzburger Arbeitspapiere zur Politikwissenschaft und Soziologie (WAPS); 7
title: Die Transnationale Zivilgesellschaft – Hoffnungsträger in der Global Governance?
title: Transnational Civil Society - a bearer of hope in global governance?
Creators: name: Jonjic, Andrea
name: Kazeka, Papy Manzanza
name: Metten, Daniel
name: Tietgen, Flora
Publisher: name: Universität Würzburg
Year: 2016
Subjects: subject: 322 Beziehungen des Staats zu organisierten Gruppen

description: Würzburger Arbeitspapiere zur Politikwissenschaft und Soziologie (WAPS); 8
title: Volksgesetzgebung und politischer Entscheidungsprozess
title: Full-Scale Citizens’ Initiatives and the policy-making process: An empirical analysis of the effects of full scale citizens’ initiatives on the policy-making process in Brandenburg and Schleswig-Holstein
title: Eine empirische Analyse der Wirkungsweise der Volksgesetzgebungsverfahren auf den politischen Entscheidungsprozess anhand der Bundesländer Brandenburg und Schleswig-Holstein
titleType: Subtitle
Creators: name: Hoffmann, Felix
Publisher: name: Universität Würzburg
Year: 2018
Subjects: subject: 320 Politikwissenschaft

description: Würzburger Arbeitspapiere zur Politikwissenschaft und Soziologie (WAPS); 9
Optical response of laser-driven charge-transfer complex described by Holstein-Hubbard model coupled to heat baths: Hierarchical equations of motion approach
Creators: name: Nakamura, Kiyoto
name: Tanimura, Yoshitaka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We investigate the optical response of a charge-transfer complex in a condensed phase driven by an external laser field. Our model includes an instantaneous short-range Coulomb interaction and a local optical vibrational mode described by the Holstein-Hubbard (HH) model. Although characterization of the HH model for a bulk system has typically been conducted using a complex phase diagram, this approach is not sufficient for investigations of dynamical behavior at finite temperature, in particular for studies of nonlinear optical properties, where the time irreversibility of the dynamics that arises from the environment becomes significant. We therefore include heat baths with infinite heat capacity in the model to introduce thermal effects characterized by fluctuation and dissipation to the system dynamics. By reducing the number of degrees of freedom of the heat baths, we derive numerically "exact" hierarchical equations of motion (HEOM) for the reduced density matrix of the HH system. As demonstrations, we calculate the optical response of the system in two- and four-site cases under external electric fields. The results indicate that the effective strength of the system-bath coupling becomes large as the number of sites increases. Excitation of electrons promotes the conductivity when the Coulomb repulsion is equivalent to or dominates the electron-phonon coupling, whereas excitation of optical vibrations always suppresses the conductivity.
description: 14 pages 8 figures
Publisher References in Bibliographic Entity Descriptions
Creators: name: Hahn, Jim
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper describes a method for improved access to publisher references in linked data RDF editors using data mining techniques and a large set of library metadata encoded in the MARC21 standard. The corpus is comprised of clustered sets of publishers and publisher locations from the library MARC21 records found in the POD Data Lake, an Ivy+ Library Consortium metadata sharing initiative. The POD Data Lake contains seventy million MARC21 records, forty million of which are unique. The discovery of publisher entity sets described forms the basis for the streamlined description of BIBFRAME Instance entities. This study resulted in two major outputs: 1) A prediction database and 2) sets of publisher location and name association rules. The association rules are the basis of a prototype autosuggestion feature of BIBFRAME Instance entity description properties designed specifically to support the autopopulation of publisher entities in linked data RDF editors.
description: 5 pages, 3 tables, 1 figure, pre-peer reviewed short paper accepted to the 84th Annual Meeting of the Association for Information Science and Technology, Oct. 29 - Nov. 3, 2021, Salt Lake City, UT
Interplay between superconductivity and non-Fermi liquid at a quantum-critical point in a metal. VI. The $γ$ model and its phase diagram at $2 < γ<3$
Creators: name: Zhang, Shang-Shun
name: Wu, Yi-Ming
name: Abanov, Artem
name: Chubukov, Andrey V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this paper, the sixth in series, we continue our analysis of the interplay between non-Fermi liquid and pairing in the effective low-energy model of fermions with singular dynamical interaction $V(Ω_m) = {\bar g}^γ/|Ω_m|^γ$ (the $γ$ model). The model describes low-energy physics of various quantum-critical metallic systems at the verge of an instability towards density or spin order, pairing of fermions at the half-filled Landau level, color superconductivity, and pairing in SYK-type models. In previous Papers I-V we analyzed the $γ$ model for $γ\leq 2$ and argued that the ground state is an ordinary superconductor for $γ<1$, a peculiar one for $12$, and an intermediate pseudogap state of preformed pairs.
description: 57 pages and 21 figures. The continuation of arXiv:2004.13220, arXiv:2006.02968, arXiv:2007.14540, arXiv:2009.10911 and arXiv:2102.04444