cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Time-integrated supernova neutrino flux from a nearby cluster
Creators: name: Nguyen, Van. T.
name: Johnson, Calvin W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The rate of gravitational collapse (type II) supernovae in our galaxy is uncertain by a factor of three or more. One way to determine the galactic supernova rate is through a radiogeochemical experiment (for example, the molybdenum-technetium experiment) that would integrate the neutrino flux over several million years. While such a measurement is designed to integrate the flux over the entire galaxy, nearby star-forming regions could skew the results. We model the flux from a recently identified such region, the Scorpius-Centaurus OB association, and compare with the flux from the rest of the galaxy.
description: 8 pages, no figures; corrected typo, added 2 references; now uses elsart.cls
Gravitational Collapse of Massless Scalar Field with Negative Cosmological Constant in (2+1) Dimensions
Creators: name: Chan, R.
name: da Silva, M. F. A.
name: da Rocha, Jaime F. Villas
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The 2+1-dimensional geodesic circularly symmetric solutions of Einstein-massless-scalar field equations with negative cosmological constant are found and their local and global properties are studied. It is found that one of them represents gravitational collapse where black holes are always formed.
description: no figures
A Geometrical Study of Matching Pursuit Parametrization
Creators: name: Jacques, Laurent
name: De Vleeschouwer, Christophe
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: Numerical Analysis (math.NA)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 94A12, 53A35

description: This paper studies the effect of discretizing the parametrization of a dictionary used for Matching Pursuit decompositions of signals. Our approach relies on viewing the continuously parametrized dictionary as an embedded manifold in the signal space on which the tools of differential (Riemannian) geometry can be applied. The main contribution of this paper is twofold. First, we prove that if a discrete dictionary reaches a minimal density criterion, then the corresponding discrete MP (dMP) is equivalent in terms of convergence to a weakened hypothetical continuous MP. Interestingly, the corresponding weakness factor depends on a density measure of the discrete dictionary. Second, we show that the insertion of a simple geometric gradient ascent optimization on the atom dMP selection maintains the previous comparison but with a weakness factor at least two times closer to unity than without optimization. Finally, we present numerical experiments confirming our theoretical predictions for decomposition of signals and images on regular discretizations of dictionary parametrizations.
description: 26 pages, 8 figures
Photon Regeneration from Pseudoscalars at X-ray Laser Facilities
Creators: name: Rabadan, Raul
name: Ringwald, Andreas
name: Sigurdson, Kris
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Recently, the PVLAS collaboration has reported an anomalously large rotation of the polarization of light in the presence of a magnetic field. As a possible explanation they consider the existence of a light pseudoscalar particle coupled to two photons. In this note, we propose a method of independently testing this result by using a high-energy photon regeneration experiment (the X-ray analogue of "invisible light shining through walls") using the synchrotron X-rays from a free-electron laser (FEL). With such an experiment the region of parameter space implied by PVLAS could be probed in a matter of minutes.
description: 3 pages, 2 figures
Relative commutator theory in varieties of omega-groups
Creators: name: Everaert, Tomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 08B99, 18G50

description: We introduce a new notion of commutator which depends on a choice of subvariety in any variety of omega-groups. We prove that this notion encompasses Higgins's commutator, Froehlich's central extensions and the Peiffer commutator of precrossed modules.
description: 16 pages
Fluctuation-dissipation considerations and damping models for ferromagnetic materials
Creators: name: Safonov, Vladimir L.
name: Bertram, H. Neal
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The role of fluctuation-dissipation relations (theorems) for the magnetization dynamics with Landau-Lifshitz-Gilbert and Bloch-Bloembergen damping terms are discussed. We demonstrate that the use of the Callen-Welton fluctuation-dissipation theorem that was proven for Hamiltonian systems can give an inconsistent result for magnetic systems with dissipation.
On the coadjoint Virasoro action
Creators: name: Alekseev, Anton
name: Meinrenken, Eckhard
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The set of coadjoint orbits of the Virasoro algebra at level 1 is in bijection with the set of conjugacy classes in a certain open subset $\widetilde{\rm SL}(2,\mathbb{R})_+$ of the universal cover of ${\rm SL}(2,\mathbb{R})$. We strengthen this bijection to a Morita equivalence of quasi-symplectic groupoids, integrating the Poisson structure on $\mathfrak{vir}^*_\mathsf{1}(S^1)$ and the Cartan-Dirac structure on $\widetilde{\rm SL}(2,\mathbb{R})_+$, respectively.
description: 40 pages
Anharmonic force fields of perchloric acid, HClO$_4$, and perchloric anhydride, Cl$_2$O$_7$. An extreme case of inner polarization
Creators: name: Boese, A. Daniel
name: Martin, Jan M. L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: DFT (density functional theory) anharmonic force fields with basis sets near the Kohn-Sham limit have been obtained for perchloric acid, HClO$_4$, and perchloric anhydride, Cl$_2$O$_7$. Calculated fundamental frequencies are in very good agreement with available experimental data. Some reassignments in the vibrational spectra of Cl$_2$O$_7$ are proposed based on our calculations. HClO$_4$ and Cl$_2$O$_7$ are particularly severe examples of the `inner polarization' phenomenon. The polarization consistent basis sets pc-1 and pc-2 (as well as their augmented counterparts) should be supplemented with two (preferably three) and one (preferably two) high-exponent $d$ functions, respectively, on second-row atoms. Complete anharmonic force fields are available as electronic supporting information.
description: J. Mol. Struct., in press (special issue); Electronic Supporting Information at http://theochem.weizmann.ac.il/web/papers/Cl2O7.html
Study of the $ρ$ and $ω$ meson decays into pseudoscalar meson and $e^+e^-$ pair with the CMD-2 detector
Creators: name: 2 Collaboration
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using 3.3 pb$^{-1}$ of data collected with the CMD-2 detector in the 720 -- 840 MeV c.m. energy range, the branching fraction of the conversion decay $ω\toπ^0e^+e^-$ has been measured: $\mathcal{B}(ω\toπ^0e^+e^-)=(8.19\pm0.71\pm0.62)\cdot10^{-4}$. The upper limits for the branching fractions of the following conversion decays have been obtained at the 90% confidence level: $\mathcal{B}(ρ\toπ^0e^+e^-)<1.6\cdot10^{-5}$, $\mathcal{B}(ρ\toηe^+e^-)<0.7\cdot10^{-5}$ and $\mathcal{B}(ω\toηe^+e^-)<1.1\cdot10^{-5}$.
description: 17 pages, 5 figures
Comparing apples to apples -- Using a modular and adaptable analysis pipeline to compare slow cerebral rhythms across heterogeneous datasets
Creators: name: Gutzen, Robin
name: De Bonis, Giulia
name: De Luca, Chiara
name: Pastorelli, Elena
name: Capone, Cristiano
name: Mascaro, Anna Letizia Allegra
name: Resta, Francesco
name: Manasanch, Arnau
name: Pavone, Francesco Saverio
name: Sanchez-Vives, Maria V.
name: Mattia, Maurizio
name: Grün, Sonja
name: Paolucci, Pier Stanislao
name: Denker, Michael
Publisher: name: arXiv
Year: 2022
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Neuroscience is moving towards a more integrative discipline, where understanding brain function requires consolidating the accumulated evidence seen across experiments, species, and measurement techniques. A remaining challenge on that path is integrating such heterogeneous data into analysis workflows such that consistent and comparable conclusions can be distilled as an experimental basis for models and theories. Here, we propose a solution in the context of slow wave activity ($<1$ Hz), which occurs during unconscious brain states like sleep and general anesthesia, and is observed across diverse experimental approaches. We address the issue of integrating and comparing heterogeneous data by conceptualizing a general pipeline design that is adaptable to a variety of inputs and applications. Furthermore, we present the Collaborative Brain Wave Analysis Pipeline (Cobrawap) as a concrete, reusable software implementation to perform broad, detailed, and rigorous comparisons of slow wave characteristics across multiple, openly available ECoG and calcium imaging datasets.
Dilepton production through timelike Compton scattering within the $k_T$-factorization approach
Creators: name: Peccini, G. M.
name: Moriggi, L. S.
name: Machado, M. V. T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In this work we consider the dilepton production via timelike Compton scattering (TCS) in electron-proton and proton-proton collisions. In particular, the differential cross section in terms of the dilepton invariant mass and rapidity is computed within the $k_T$-factorization approach. Besides, we utilize distinct unintegrated gluon distributions (UGD) in order to compare their impact on the differential cross section of TCS in $pp$ ($ep$) collisions evaluated at the LHC (LHeC), HL-LHC (LHeC), HE-LHC (LHeC) and FCC-hh (eh) center-of-mass energies.
description: 9 pages, 4 figures
title: Specially Constructed Bridges:
title: Activities for Fiscal Year 1983
titleType: Subtitle
Creators: name: Hopwood, Theodore
name: Havens, James H.
name: Sharpe, Gary W.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1984
Subjects: subject: Transportation Engineering

description: The field performance of bridge features including masonry coatings, galvanized steel, weathering steel, conventional deck reinforcing steel, and epoxy-coated reinforcing steel were examined either visually or nondestructively on various pre-selected bridges throughout Kentucky. Additionally, a nationwide survey of state highway authorities was conducted on the application and service performance of stay-in-place forms.  All of the bridge features inspected appeared to be performing satisfactorily, except for the masonry coating failure on the I-471 twin bridges over the Ohio River at Newport. Results of the stay-in-place form survey support their application as a cost-saving feature.
title: Political Conservatism and Fair Trade
title: Conceptual and Empirical Investigations
titleType: Subtitle
Creators: name: Usslepp, Thomas
Publisher: name: Lancaster University
Year: 2022
Subjects: political conservatism
fair trade

description: The concept of fair trade has been investigated by marketing researchers over the past few years. The literature has described fair trade as a political phenomenon. Examining what the politicisation of the fair trade market means for consumers requires, however, the application of a more specific theoretical lens. Political ideology offers such a theoretical lens that allows us to understand how politically charged fair trade marketing resonates with consumers’ political beliefs. Political ideology ranges from political liberalism to political conservatism. This thesis focuses on political conservatism due to its potential inhibitory effect on the willingness to buy fair trade products. The thesis is made up of conceptual and empirical works and comprises three articles. The foundational first article addresses the limited structure of the goals of political conservatism as described in the literature. Applying a goal systemic perspective to political conservatism, article 1 conceptualises a superordinate goal (i.e., securing the in-group advantageous status quo), two intermediate goals (i.e., resistance to change and endorsement of inequality), and five subordinate goals (i.e., conventionalism, authoritarian submission, authoritarian aggression, dominance, and anti-egalitarianism). Having conceptualized the goal pursuit of conservatives, article 2 moves on to applying the findings of article 1 in that article 2 examines the relationship between conservative goals and their effect on the willingness to buy fair trade goods. The results reported in article 2 demonstrate a contradiction between the conservatives’ goal pursuit and fair trade consumption. The findings of article 2 suggests that fair trade perspective-taking and fair trade identity are two psychological features of politically conservative consumers that reduce their appetite for fair trade products. Additionally, I found age and income to moderate the effect of conservatism on fair trade perspective-taking. The third article then developed and tested marketing interventions that potentially diminish the inhibitory effect of political conservatism on fair trade consumption. The results in article 3 show that conservative consumers are more willing to consume fair trade products when they are exposed to appeals utilising status rather than altruism, because status appeals can be processed with more fluency. Taken together, this thesis contributes to the literature in that it sheds a new light on the various goals of political conservatism and how these goals resonate with the appeals of fair trade products. Additionally, this thesis offers managerial advice on how to target the segment of conservative consumers (article 2) and on which marketing interventions to use for the promotion of fair trade products to conservative consumers (article 3).
Modifications to the Cosmic 21-cm Background Frequency Spectrum by Scattering via electrons in Galaxy Clusters
Creators: name: Cooray, Asantha
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The cosmic 21-cm background frequency spectrum related to the spin-flip transition of neutral Hydrogen present during and before the era of reionization is rich in features associated with physical processes that govern transitions between the two spin states. The intervening electrons in foreground galaxy clusters inversely Compton scatter the 21-cm background spectrum and modify it just as the cosmic microwave background (CMB) spectrum is modified by inverse-Compton scattering. Towards typical galaxy clusters at low redshifts, the resulting modification is a few tenths milli-Kelvin correction to the few tens milli-Kelvin temperature of 21-cm signal relative to that of the cosmic microwave background black body spectrum. The modifications are mostly associated with sharp changes in the cosmic 21-cm background spectrum such as due to the onset of a Lyman-$α$ radiation field or heating of neutral gas. Though low frequency radio interferometers that are now planned for 21-cm anisotropy measurements are insensitive to the mean 21-cm spectrum, differential observations of galaxy clusters with these interferometers can be utilized to indirectly establish global features in the 21-cm frequency spectrum. We discuss the feasibility to detect the spectrum modified by clusters and find that for upcoming interferometers, while a detection towards an individual cluster is challenging, one can average signals over a number of clusters, selected based on the strength of the Sunyave-Zel'dovich effect at high radio frequencies involving CMB scattering alone, to establish the mean 21-cm spectrum.
description: 6 pages, 3 figures, PRD in press; expanded and title changed from v1. Final version in press
Introduction to Cable Suspension Bridges
Creators: name: Hopwood, Theodore
name: Havens, James H.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1984
Subjects: subject: Transportation Engineering

description: This report is an overview of suspension bridges. A historical perspective of bridge construction design and materials is included, focusing on bridges of interest to the Kentucky Transportation Cabinet. The report is intended to provide background information on suspension bridges to those not well acquainted with the structures.
Quantum signatures of chaos in a cavity-QED-based stimulated Raman adiabatic passage
Creators: name: Dey, Amit
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: A nonlinear stimulated Raman adiabatic passage (STIRAP) is a fascinating physical process that dynamically explores chaotic and non-chaotic phases. In a recent paper Phys. Rev. Res. 2, 042004 (R) (2020), such a phenomenon is realized in a cavity-QED platform. There, the emergence of chaos and its impact on STIRAP efficiency are mainly demonstrated in the semiclassical limit. In the present paper I treat the problem in a fully quantum many-body framework. With the aim of extracting quantum signatures of a classically chaotic system, it is shown that an out-of-time-ordered correlator (OTOC) measure precisely captures chaotic/non-chaotic features of the system. The prediction by OTOC is in precise matching with classical chaos quantified by Lyapunov exponent (LE). Furthermore, it is shown that the quantum route corresponding to the semiclassical followed state encounters a dip in single-particle purity within the chaotic phase, depicting a consequence of chaos. A dynamics through the chaotic phase is associated with spreading of many-body quantum state and an irreversible increase in the number of participating adiabatic eigenstates.
description: 8 pages, 6 figures
Education and Women's Resiliency: Exploring the Experiences of Successful Women from Disadvantaged Backgrounds
Creators: name: Lepage-Lees, Pamela
Publisher: name: Advancing Women in Leadership Journal
Year: 2017

description: While some research has explored the needs of minority women, very little research has focused on women who have faced other disadvantages beyond those associated with minority status.
description: Advancing Women in Leadership Journal, Vol. 3 (1998)
HULK-V: a Heterogeneous Ultra-low-power Linux capable RISC-V SoC
Creators: name: Valente, Luca
name: Tortorella, Yvan
name: Sinigaglia, Mattia
name: Tagliavini, Giuseppe
name: Capotondi, Alessandro
name: Benini, Luca
name: Rossi, Davide
Publisher: name: arXiv
Year: 2022
Subjects: subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences

description: IoT applications span a wide range in performance and memory footprint, under tight cost and power constraints. High-end applications rely on power-hungry Systems-on-Chip (SoCs) featuring powerful processors, large LPDDR/DDR3/4/5 memories, and supporting full-fledged Operating Systems (OS). On the contrary, low-end applications typically rely on Ultra-Low-Power ucontrollers with a "close to metal" software environment and simple micro-kernel-based runtimes. Emerging applications and trends of IoT require the "best of both worlds": cheap and low-power SoC systems with a well-known and agile software environment based on full-fledged OS (e.g., Linux), coupled with extreme energy efficiency and parallel digital signal processing capabilities. We present HULK-V: an open-source Heterogeneous Linux-capable RISC-V-based SoC coupling a 64-bit RISC-V processor with an 8-core Programmable Multi-Core Accelerator (PMCA), delivering up to 13.8 GOps, up to 157 GOps/W and accelerating the execution of complex DSP and ML tasks by up to 112x over the host processor. HULK-V leverages a lightweight, fully digital memory hierarchy based on HyperRAM IoT DRAM that exposes up to 512 MB of DRAM memory to the host CPU. Featuring HyperRAMs, HULK-V doubles the energy efficiency without significant performance loss compared to featuring power-hungry LPDDR memories, requiring expensive and large mixed-signal PHYs. HULK-V, implemented in Global Foundries 22nm FDX technology, is a fully digital ultra-low-cost SoC running a 64-bit Linux software stack with OpenMP host-to-PMCA offload within a power envelope of just 250 mW.
description: This paper has been accepted as full paper at DATE23 https://www.date-conference.com/date-2023-accepted-papers#Regular-Papers
Monte Carlo Hamiltonian of lattice gauge theory
Creators: name: Paradis, F.
name: Kroger, H.
name: Luo, X. Q.
name: Moriarty, K. J. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We discuss how the concept of the Monte Carlo Hamiltonian can be applied to lattice gauge theories.
description: "Non-Perturbative Quantum Field Theory: Lattice and Beyond", Guangzhou, China 2004
Magnetoresistance of Junctions made of Underdoped YBCO Separated by a Ga-doped YBCO Barrier
Creators: name: Shkedy, L.
name: Koren, G.
name: Polturak, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report magnetoresistance measurements of ramp type superconductor-normal-superconductor (SNS) junctions. The junctions consist of underdoped $YBa_{2}Cu_{3}O_y$ (YBCO) electrodes separated by a barrier of $YBa_{2}Cu_{2.6}Ga_{0.4}O_y$. We observe a large positive magnetoresistance, linear in the field. We suggest that this unusual magnetoresistance originates in the field dependence of the proximity effect. Our results indicate that in underdoped YBCO/N/YBCO SNS structures, the proximity effect does not exhibit the anomalously long range found in optimally doped YBCO structures. From our data we obtain the diffusion coefficient and relaxation time of quasiparticles in underdoped YBCO.
description: 5 figures, accepted for publication in Physical Review B
Data-driven Selection of Coarse-Grained Models of Coupled Oscillators
Creators: name: Snyder, Jordan
name: Zlotnik, Anatoly
name: Lokhov, Andrey Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Systematic discovery of reduced-order closure models for multi-scale processes remains an important open problem in complex dynamical systems. Even when an effective lower-dimensional representation exists, reduced models are difficult to obtain using solely analytical methods. Rigorous methodologies for finding such coarse-grained representations of multi-scale phenomena would enable accelerated computational simulations and provide fundamental insights into the complex dynamics of interest. We focus on a heterogeneous population of oscillators of Kuramoto type as a canonical model of complex dynamics, and develop a data-driven approach for inferring its coarse-grained description. Our method is based on a numerical optimization of the coefficients in a general equation of motion informed by analytical derivations in the thermodynamic limit. We show that certain assumptions are required to obtain an autonomous coarse-grained equation of motion. However, optimizing coefficient values enables coarse-grained models with conceptually disparate functional forms, yet comparable quality of representation, to provide accurate reduced-order descriptions of the underlying system.
description: 13 pages, 10 figures
Wear and microstructural integrity of ceramic plasma sprayed coatings
Creators: name: Erickson, Lynn C.
Publisher: name: University of British Columbia
Year: 2009

description: In this work a series of ceramic plasma sprayed (PS) coatings, both alumina- and chromia-based, were sprayed according to a matrix of deposition parameters in order to produce a broad range of microstructures. To investigate the effect of splat size on the coating response, a series of mono-crystalline a-alumina powders with very narrow particle size ranges, nominally 5, 10 and 18 microns in diameter, was sprayed. The coatings were extensively characterized for a variety of microstructural features, including porosity, the angular distribution and density of microcracks as well as the lamellar, or splat, dimensions, using techniques of metallurgical analysis and electron microscopy. The coatings were then evaluated using a series of micromechanical techniques, including indentation, controlled scratch testing, abrasion and dry particle erosion, to investigate their response to different contact situations. It was found that the microstructural features with the most influence on the behaviour of ceramic PS coatings during contact, or wear, by hard particles include, in order of importance: 1) macro-porosity, 2) horizontal crack density, 3) degree of flattening of the splats and 4) volume of unmelted particles, which are all linked to the level and strength of interlamellar bonding in the coating. The major effect of the inter-lamellar bonding in ceramic PS coatings was seen in the wear mechanism transitions. As the level of inter-splat bonding in the coating decreases, the contact load at which the transition from plastic deformation to splat fracture and debonding occurs does as well. However, the load at which catastrophic brittle fracture and spalling occur is increased. All of the micromechanical and wear methods evaluated in the present work were sensitive to differences in the coating microstructures to varying degrees. The low load abrasion results showed the most sensitivity to the microstructural differences of the coatings, followed by controlled scratching.
Voices of Women at Entry Level Positions of Educational Administration
Creators: name: Hackney, Catherine Eggleston
Publisher: name: Advancing Women in Leadership Journal
Year: 2017

description: If women are to stand on equal professional footing with males in educational administration, a new organizational paradigm must emerge. Alternative voices, experiences, backgrounds, and histories must be acknowledged as valid. Each and every individual must be considered valuable to the organization. Compassion, respect, generosity, and connectedness must be the norm.
description: Advancing Women in Leadership Journal, No. 3 (1998)
Density resummation of perturbation series in a pion gas to leading order in chiral perturbation theory
Creators: name: Krivoruchenko, M. I.
name: Fuchs, C.
name: Martemyanov, B. V.
name: Faessler, Amand
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The mean field (MF) approximation for the pion matter, being equivalent to the leading ChPT order, involves no dynamical loops and, if self-consistent, produces finite renormalizations only. The weight factor of the Haar measure of the pion fields, entering the path integral, generates an effective Lagrangian $δ\mathcal{L}_{H}$ which is generally singular in the continuum limit. There exists one parameterization of the pion fields only, for which the weight factor is equal to unity and $δ\mathcal{L}_{H}=0$, respectively. This unique parameterization ensures selfconsistency of the MF approximation. We use it to calculate thermal Green functions of the pion gas in the MF approximation as a power series over the temperature. The Borel transforms of thermal averages of a function $\mathcal{J}(χ^αχ^α)$ of the pion fields $χ^α$ with respect to the scalar pion density are found to be $\frac{2}{\sqrtπ}\mathcal{J}(4t)$. The perturbation series over the scalar pion density for basic characteristics of the pion matter such as the pion propagator, the pion optical potential, the scalar quark condensate $$, the in-medium pion decay constant ${\tilde{F}}$, and the equation of state of pion matter appear to be asymptotic ones. These series are summed up using the contour-improved Borel resummation method. The quark scalar condensate decreases smoothly until $T_{max}\simeq 310$ MeV. The temperature $T_{max}$ is the maximum temperature admissible for thermalized non-linear sigma model at zero pion chemical potentials. The estimate of $T_{max}$ is above the chemical freeze-out temperature $T\simeq 170$ MeV at RHIC and above the phase transition to two-flavor quark matter $T_{c} \simeq 175$ MeV, predicted by lattice gauge theories.
description: Replaced with revised and extended version. Results are compared to lattice gauge theories. 16 pages REVTeX, 13 eps figures
Neutrino production in blazar radio cores
Creators: name: Kalashev, O. E.
name: Kivokurtseva, P.
name: Troitsky, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Models of the origin of astrophysical neutrinos with energies from TeVs to PeVs are strongly constrained by multimessenger observations and population studies. Recent results point to statistically significant associations between these neutrinos and active galactic nuclei (AGN) selected by their radio flux observed with very-long-baseline interferometry (VLBI). This suggests that the neutrinos are produced in central parsecs of blazars, AGN with relativistic jets pointing to the observer. However, conventional AGN models tend to explain only the highest-energy part of the neutrino flux observationally associated with blazars. Here we discuss in detail how the neutrinos can be produced in the part of an AGN giving the dominant contribution to the VLBI radio flux, the radio core located close to the jet base. Physical conditions there differ both from the immediate environment of the central black hole and from the plasma blobs moving along the jet. Required neutrino fluxes, considerably smaller than those of photons, can be produced in interactions of relativistic protons, accelerated closer to the black hole, with radiation in the core.
description: 15 pages, 7 figures. V2: discussions added, plots corrected - conclusions unchanged. Version accepted by JCAP
BLACK ACADEMIC WOMEN: PROGRESS BUT NO PARITY
Creators: name: Gregory, Shela T.
Publisher: name: Advancing Women in Leadership Journal
Year: 2017

description: Although many Black faculty women in this study found teaching personally rewarding as opposed to the politics of administration, other concerns such as unclear expectations of scholarly research and ambiguous requirements of promotion and tenure continued to be tremendous barriers towards advancement
description: Advancing Women in Leadership Journal, Vol. 3 (1998)
On Concurrence and Entanglement of Rank Two Channels
Creators: name: Uhlmann, Armin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Concurrence and further entanglement quantifyers can be computed explicitly for channels of rank two if representable by just two Kraus operators. Almost all details are available for the subclass of rank two 1-qubit-channels. There is a simple geometric picture beyond, explaining nicely the role of anti-linearity.
description: 20 pages. An appendix is added. An error in (45) - (47) and known (to me) misspellings are corrected
CP violating effects in $^{210}$Fr and prospects for new physics beyond the Standard Model
Creators: name: Shitara, Nanako
name: Yamanaka, Nodoka
name: Sahoo, Bijaya Kumar
name: Watanabe, Toshio
name: Das, Bhanu Pratap
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report theoretical results of the electric dipole moment (EDM) of $^{210}$Fr which arises from the interaction of the EDM of an electron with the internal electric field in an atom and the scalar-pseudoscalar electron-nucleus interaction; the two dominant sources of CP violation in this atom. Employing the relativistic coupled-cluster theory, we evaluate the enhancement factors for these two CP violating interactions to an accuracy of about 3% and analyze the contributions of the many-body effects. These two quantities in combination with the projected sensitivity of the $^{210}$Fr EDM experiment provide constraints on new physics beyond the Standard Model. Particularly, we demonstrate that their precise values are necessary to account for the effect of the bottom quark in models in which the Higgs sector is augmented by nonstandard Yukawa interactions such as the two-Higgs doublet model.
description: 17 pages, 6 figures, published version
Identifiability and singular locus of secant varieties to Grassmannians
Creators: name: Galgano, Vincenzo
name: Staffolani, Reynaldo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M15, 14M17, 14N07

description: Secant varieties are among the main protagonists in tensor decomposition, whose study involves both pure and applied mathematical areas. Grassmannians are the building blocks for skewsymmetric tensors. Although they are ubiquitous in the literature, the geometry of their secant varieties is not completely understood. In this work we determine the singular locus of the secant variety of lines to a Grassmannian Gr(k,V) using its structure as SL(V)-variety. We solve the problems of identifiability and tangential-identifiability of points in the secant variety: as a consequence, we also determine the second Terracini locus to a Grassmannian.
description: 25 pages
What becomes of vortices when they grow giant
Creators: name: Penin, Alexander A.
name: Weller, Quinten
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss vortex solutions of the abelian Higgs model in the limit of large winding number $n$. We suggest a framework where a topological quantum number $n$ is associated with a ratio of dynamical scales and a systematic expansion in inverse powers of $n$ is then derived in the spirit of effective field theory. The general asymptotic form of ${\it giant}$ vortices is obtained. For critical coupling the axially symmetric vortices become ${\it integrable}$ in the large-$n$ limit and we present the corresponding analytic solution. The method provides simple asymptotic formulae for the vortex shape and parameters with accuracy that can be systematically improved, and can be applied to topological solitons of other models. After including the next-to-leading terms the approximation works remarkably well down to $n=1$.
description: 5 pages, 5 figures, Fig. 5 corrected, published version
D-Brane Charges in Gepner Models
Creators: name: Braun, Volker
name: Schafer-Nameki, Sakura
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct Gepner models in terms of coset conformal field theories and compute their twisted equivariant K-theories. These classify the D-brane charges on the associated geometric backgrounds and therefore agree with the topological K-theories. We show this agreement for various cases, in particular the Fermat quintic.
description: 25 pages, 2 figures. LaTeX. v2: typos and references corrected. v3: reference added
Dynamical preparation of stripe states in spin-orbit coupled gases
Creators: name: Cabedo, Josep
name: Claramunt, Joan
name: Celi, Alessio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In spinor Bose-Einstein condensates, spin-changing collisions are a remarkable proxy to coherently realize macroscopic many-body quantum states. These processes have been, e.g., exploited to generate entanglement, to study dynamical quantum phase transitions, and proposed for realizing nematic phases in atomic condensates. In the same systems dressed by Raman beams, the coupling between spin and momentum induces a spin dependence in the scattering processes taking place in the gas. Here we show that, at weak couplings, such modulation of the collisions leads to an effective Hamiltonian which is equivalent to the one of an artificial spinor gas with spin-changing collisions that are tunable with the Raman intensity. By exploiting this dressed-basis description, we propose a robust protocol to coherently drive the spin-orbit coupled condensate into the ferromagnetic stripe phase via crossing a quantum phase transition of the effective low-energy model in an excited-state.
description: v3:Main text: 5 pages + references, 3 figures; supplemental material: 5 pages, 2 figures. Title and focus changed. Extended companion paper with original title and focus to appear soon as a different submission
A Book Review
Creators: name: Lee, Amy Freeman
Publisher: name: Advancing Women in Leadership Journal
Year: 2017

description: May Sarton's final journal, At Eighty-Two, calls to mind Eleanor Roosevelt's My Day, though their days were quite different. In essence, Sarton's journal is about approaching death. Specifically, it is focused on the impending final days of this prolific poet, novelist and journalist. Even though one brings to the reading experience enormous empathy and sympathy, the overall result is exceedingly depressing. Sarton writes in such detail about the multiple facets of her illness and especially about her overpowering depression that the dark aura of the book is inescapable. Not even her rich vocabulary and fresh turn of phrase relieved the overall gloom. However, one would have to be totally without feeling to criticize the books content in a censorial way because of this sober tone.
description: Advancing Women in Leadership Journal, Vol. 3 (1998)
Deep-Reinforcement-Learning-Based Scheduling with Contiguous Resource Allocation for Next-Generation Cellular Systems
Creators: name: Sun, Shu
name: Li, Xiaofeng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Scheduling plays a pivotal role in multi-user wireless communications, since the quality of service of various users largely depends upon the allocated radio resources. In this paper, we propose a novel scheduling algorithm with contiguous frequency-domain resource allocation (FDRA) based on deep reinforcement learning (DRL) that jointly selects users and allocates resource blocks (RBs). The scheduling problem is modeled as a Markov decision process, and a DRL agent determines which user and how many consecutive RBs for that user should be scheduled at each RB allocation step. The state space, action space, and reward function are delicately designed to train the DRL network. More specifically, the originally quasi-continuous action space, which is inherent to contiguous FDRA, is refined into a finite and discrete action space to obtain a trade-off between the inference latency and system performance. Simulation results show that the proposed DRL-based scheduling algorithm outperforms other representative baseline schemes while having lower online computational complexity.
description: 14 pages, 4 figures
Control of Active Brownian Particles: An exact solution
Creators: name: Baldovin, Marco
name: Guéry-Odelin, David
name: Trizac, Emmanuel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Control of stochastic systems is a challenging open problem in statistical physics, with potential applications in a wealth of systems from biology to granulates. Unlike most cases investigated so far, we aim here at controlling a genuinely out-of-equilibrium system, the two dimensional Active Brownian Particles model in a harmonic potential, a paradigm for the study of self-propelled bacteria. We search for protocols for the driving parameters (stiffness of the potential and activity of the particles) bringing the system from an initial passive-like stationary state to a final active-like one, within a chosen time interval. The exact analytical results found for this prototypical system of self-propelled particles brings control techniques to a wider class of out-of-equilibrium systems.
description: 6 pages, 3 figures + supplemental material (10 pages, 3 figures)
Lumineschence spectra of inorganic scintillating screens induced by fast and slow extracted beams from SIS18
Creators: name: Lieberwirth, A.
name: Forck, P.
name: Lederer, S.
name: Ensinger, W.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
Interaction-induced topological superconductivity in antiferromagnet-superconductor junctions
Creators: name: Luntama, Senna S.
name: Törmä, Päivi
name: Lado, Jose L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We predict that junctions between an antiferromagnetic insulator and a superconductor provide a robust platform to create a one-dimensional topological superconducting state. Its emergence does not require the presence of intrinsic spin-orbit coupling nor non-collinear magnetism, but arises solely from repulsive electronic interactions on interfacial solitonic states. We demonstrate that a topological superconducting state is generated by repulsive interactions at arbitrarily small coupling strength, and that the size of the topological gap rapidly saturates to the one of the parent trivial superconductor. Our results put forward antiferromagnetic insulators as a new platform for interaction-driven topological superconductivity.
description: 10 pages, 7 figures
Cluster Dynamics of Planetary Waves
Creators: name: Kartashova, Elena
name: L'vov, Victor S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The dynamics of nonlinear atmospheric planetary waves is determined by a small number of independent wave clusters consisting of a few connected resonant triads. We classified the different types of connections between neighboring triads that determine the general dynamics of a cluster. Each connection type corresponds to substantially different scenarios of energy flux among the modes. The general approach can be applied directly to various mesoscopic systems with 3-mode interactions, encountered in hydrodynamics, astronomy, plasma physics, chemistry, medicine, etc.
description: 6 pages, 3 figs, EPL, published
Competing magnetic fluctuations and orders in a multiorbital model of doped SrCo$_2$As$_2$
Creators: name: Nedić, Ana-Marija
name: Christensen, Morten H.
name: Lee, Y.
name: Li, Bing
name: Ueland, Benjamin G.
name: Fernandes, Rafael M.
name: McQueeney, Robert J.
name: Ke, Liqin
name: Orth, Peter P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We revisit the intriguing magnetic behavior of the paradigmatic itinerant frustrated magnet $\rm{Sr}\rm{Co}_2\rm{As}_2$, which shows strong and competing magnetic fluctuations yet does not develop long-range magnetic order. By calculating the static spin susceptibility $χ(\mathbf{q})$ within a realistic sixteen orbital Hubbard-Hund model, we determine the leading instability to be ferromagnetic (FM). We then explore the effect of doping and calculate the critical Hubbard interaction strength $U_c$ that is required for the development of magnetic order. We find that $U_c$ decreases under electron doping and with increasing Hund's coupling $J$, but increases rapidly under hole doping. This suggests that magnetic order could possibly emerge under electron doping but not under hole doping, which agrees with experimental findings. We map out the leading magnetic instability as a function of doping and Hund's coupling and find several antiferromagnetic phases in addition to FM. We also quantify the degree of itinerant frustration in the model and resolve the contributions of different orbitals to the magnetic susceptibility. Finally, we discuss the dynamic spin susceptibility, $χ(\mathbf{q}, ω)$, at finite frequencies, where we recover the anisotropy of the peaks at $\mathbf{Q}_π= (π, 0)$ and $(0, π)$ observed by inelastic neutron scattering that is associated with the phenomenon of itinerant magnetic frustration. By comparing results between theory and experiment, we conclude that the essential experimental features of doped SrCo$_2$As$_2$ are well captured by a Hubbard-Hund multiorbital model if one considers a small shift of the chemical potential towards hole doping.
description: 19 pages, 12 figures
ESR operation and development
Creators: name: Dimopoulou, C.
name: Kelnhofer, M.
name: Kleffner, C.
name: Litvinov, S.
name: Nolden, F.
name: Peschke, C.
name: Petridis, N.
name: Popp, U.
name: Roßbach, J.
name: Sanjari, S.
name: Steck, M.
name: Winters, D.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2015
Subjects: Physics

description: GSI Scientific Report 2014 - GSI Report 2015-1
Switching Checkerboards
Creators: name: Ellison, David
name: Jouve, Bertrand
name: Stone, Lewi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In order to study $\mathbf{M}(R,C)$, the set of binary matrices with fixed row and column sums $R$ and $C$, we consider sub-matrices of the form $\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}$ and $\begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}$, called positive and negative checkerboard respectively. We define an oriented graph of matrices $G(R,C)$ with vertex set $\mathbf{M}(R,C)$ and an arc from $\mathbf{A}$ to $\mathbf{A'}$ indicates you can reach $\mathbf{A'}$ by switching a negative checkerboard in $\mathbf{A}$ to positive. We show that $G(R,C)$ is a directed acyclic graph and identify classes of matrices which constitute unique sinks and sources of $G(R,C)$. Given $\mathbf{A},\mathbf{A'}\in\mathbf{M}(R,C)$, we give necessary conditions and sufficient conditions on $\mathbf{M}=\mathbf{A'}-\mathbf{A}$ for the existence of a directed path from $\mathbf{A}$ to $\mathbf{A'}$.
We then consider the special case of $\mathbf{M}(\mathcal D)$, the set of adjacency matrices of graphs with fixed degree distribution $\mathcal D$. We define $G(\mathcal D)$ accordingly by switching negative checkerboards in symmetric pairs. We show that $Z_2$, an approximation of the spectral radius $λ_1$ based on the second Zagreb index, is non-decreasing along arcs of $G(\mathcal D)$. Also, $\ll$ reaches its maximum in $\mathbf{M}(\mathcal D)$ at a sink of $G(\mathcal D)$. We provide simulation results showing that applying successive positive switches to an Erd\H os-Rényi graph can significantly increase $λ_1$.