cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Exhaustive constructions of effective models in 1651 magnetic space groups
Creators: name: Tang, Feng
name: Wan, Xiangang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The $k\cdot p$ effective Hamiltonians have been widely applied to predict a large variety of phenomena in condensed matter systems. Currently, the popular way to construct a $k\cdot p$ Hamiltonian is in a case-by-case manner, which significantly limits its applications especially for magnetic systems. In this work, we first explicitly tabulate all the representation matrices for all single-valued and double-valued irreducible representations (irreps) and co-irreps for the little groups of all special $k$ points in 1651 magnetic space groups (including nonmagnetic 230 space groups). Then through group theory analysis, we obtain 4 857 832 elementary $k\cdot p$ matrix blocks, and directly using these matrix blocks given in this work one can obtain any $k\cdot p$ Hamiltonian for any periodic system, including bulk or boundary. We believe our work will accelerate the studies in various fields in condensed matter physics, such as semiconductors, topological physics, spintronics, etc. We also expect our exhaustive results on $k\cdot p$ models will play vital roles in connecting other fields with condensed matter physics and promote realizations of diverse theoretical models which possess exotic properties but lack practical materials.
description: The Supplementary Materials are provided at:http://ccmp.nju.edu.cn/DFS//file/2021/04/20/20210420162837983qjeu8l.zip
An Audio-Driven System For Real-Time Music Visualisation
Creators: name: Graf, Max
name: Opara, Harold Chijioke
name: Barthet, Mathieu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: Computer-generated visualisations can accompany recorded or live music to create novel audiovisual experiences for audiences. We present a system to streamline the creation of audio-driven visualisations based on audio feature extraction and mapping interfaces. Its architecture is based on three modular software components: backend (audio plugin), frontend (3D game-like environment), and middleware (visual mapping interface). We conducted a user evaluation comprising two stages. Results from the first stage (34 participants) indicate that music visualisations generated with the system were significantly better at complementing the music than a baseline visualisation. Nine participants took part in the second stage involving interactive tasks. Overall, the system yielded a Creativity Support Index above average (68.1) and a System Usability Scale index (58.6) suggesting that ease of use can be improved. Thematic analysis revealed that participants enjoyed the system's synchronicity and expressive capabilities, but found technical problems and difficulties understanding the audio feature terminology.
description: 8 pages, 3 figures
A Three Site Higgsless Model
Creators: name: Chivukula, R. Sekhar
name: Coleppa, Baradhwaj
name: Di Chiara, Stefano
name: He, Hong-Jian
name: Kurachi, Masafumi
name: Simmons, Elizabeth H.
name: Tanabashi, Masaharu
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We analyze the spectrum and properties of a highly-deconstructed Higgsless model with only three sites. Such a model contains sufficient complexity to incorporate interesting physics issues related to fermion masses and electroweak observables, yet remains simple enough that it could be encoded in a Matrix Element Generator program for use with Monte Carlo simulations. The gauge sector of this model is equivalent to that of the BESS model; the new physics of interest here lies in the fermion sector. We analyze the form of the fermion Yukawa couplings required to produce the ideal fermion delocalization that causes tree-level precision electroweak corrections to vanish. We discuss the size of one-loop corrections to b \to s γ, the weak-isospin violating parameter αT and the decay Z \to b \bar{b}. We find that the new fermiophobic vector states (the analogs of the gauge-boson KK modes in a continuum model) can be reasonably light, with a mass as low as 380 GeV, while the extra (approximately vectorial) quark and lepton states (the analogs of the fermion KK modes) must be heavier than 1.8 TeV.
description: 30 pages, JHEP.cls, axodraw. References and acknowledgements added, minor textual clarifications added and typos fixed, relationship to BESS model emphasized. Typos corrected, version to appear in PRD
Picture Matching and Storybooks
Creators: name: Girado, Luther
name: Hammond, Jon
name: Hernandez, Betty
name: Grant, Laura
name: Turner, Julie
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: This file contains an activity done among speakers which consists of matching pictures and doing small activities from a storybook. The sound weakens significantly during the story "The Chicken Thief."
Stochastic computation of $g-2$ in QED
Creators: name: Kitano, Ryuichiro
name: Takaura, Hiromasa
name: Hashimoto, Shoji
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform a numerical computation of the anomalous magnetic moment ($g-2$) of the electron in QED by using the stochastic perturbation theory. Formulating QED on the lattice, we develop a method to calculate the coefficients of the perturbative series of $g-2$ without the use of the Feynman diagrams. We demonstrate the feasibility of the method by performing a computation up to the $α^3$ order and compare with the known results. This program provides us with a totally independent check of the results obtained by the Feynman diagrams and will be useful for the estimations of not-yet-calculated higher order values. This work provides an example of the application of the numerical stochastic perturbation theory to physical quantities, for which the external states have to be taken on-shell.
description: 35 pages, 5 figures, 2 tables, the version to appear in JHEP
Is orbital angular momentum always conserved in spontaneous parametric down-conversion?
Creators: name: Feng, Sheng
name: Chen, Chao-Hsiang
name: Barbosa, Geraldo A.
name: Kumar, Prem
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the non-linear optical process of type-II spontaneous parametric down-conversion, we present on an experiment showing that the two-photon detection amplitude of the down-converted beams does not generally reproduce the transverse profile of the pump beam that carries non-zero orbital angular momentum. We explain this observation by that orbital angular momentum is not conserved in the type-II non-linear process due to the broken rotational symmetry of the Hamiltonian.
description: 4 pages, 3 figures, submitted to Phys. Rev. Lett. Revised
title: Elementos discursivos en Los enamoramientos de Javier Marías
Creators: name: Pozuelo Yvancos, José María
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2014

description: The essay analyzes certain elements of the narrative structure of The Infatuations (2011) by Javier Marías. It initially approaches the intimate relationship between Eros and Thanatos in the novel and the growing importance of Death in the work of the author. The study then focuses on two discursive resources which are privileged in the novel. The first is the narrator’s perspective, who connects her view with the facts as they develop in time and also to the way the protagonist first suspects and then discovers the truth about the circumstances of Michael Devern’s death. The second discursive resource that the article analyzes is the intelligent narrative organization of anticipations and prolepses. Through the selection of a series of key texts, the article highlights the way in which Javier Marias sprinkles narrative seeds which lay the foundations for the intrigue.
description: Rassegna iberistica, 37 | 101 | 2014
Development and validation of a new scale for the assessment of psychopathy
Creators: name: Hart, Stephen D.
Publisher: name: University of British Columbia
Year: 2008

description: A review of the construct of psychopathy suggested that procedures for assessing the disorder should take into account its two-facet structure, its chronicity, its association with criminality, and its association with deceitfulness. A review of the five most popular assessment procedures currently in use indicated that none of them was completely satisfactory; the Hare Psychopathy Checklist-Revised (PCL-R) appeared to be superior to the other measures in most respects, but it was not well-suited for use outside of forensic settings. It was therefore decided to develop anew scale, based on the PCL-R, that would be suitable for both forensic and nonforensic settings. Pilot testing resulted in a 12-item symptom construct rating scale, named the Psychopathy Checklist: Screening Version (PCL:SV). The PCL:SV was validated in 11 samples (N = 586) from forensic/nonpsychiatric, forensic/psychiatric, civil/psychiatric, and civil/nonpsychiatric settings. Results indicated that the PCL:SV had good internal consistency, interrater reliability, and temporal stability. The scale also appeared to have a two-factor structure, at least in samples with an appreciable base rate of psychopathy. The PCL:SV was highly correlated with other psychopathy-related measures, including the PCL-R, antisocial personality disorder symptom counts, and several self-report scales. It also had a pattern of convergent and discriminant validities that was consistent with both theory and previous research that used the PCL-R. It was concluded that the PCL:SV holds considerable promise as a measure of psychopathy; areas requiring further research were identified.
Light confinement by local index tailoring in inhomogeneous dielectrics
Creators: name: Krešić, I.
name: Makris, K. G.
name: Rotter, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The engineering of light confinement is a topic with a long history in optics and with significant implications for the control of light-matter interaction. In inhomogeneous and disordered media, however, multiple scattering prevents the application of conventional approaches for the design of light fields with desired properties. This is because any local change to such a medium typically affects these fields in a non-local and complicated fashion. Here, we present a theoretical methodology for tailoring an inhomogeneous one-dimensional (1D) Hermitian dielectric index distribution, such that the intensity profile of an incoming light field can be controlled purely locally, i.e., with little or no influence on the field profile outside of a designated region of interest. Strongly increasing or decreasing the light's intensity at arbitrary positions inside the medium thereby becomes possible without, in fact, changing the external reflectance or transmittance of the medium. These local modifications of the medium can thus be made undetectable to unidirectional far field measurements. We apply our approach to locally control the confinement of light inside 1D materials with inhomogeneous continuous refractive index profiles and extend it to multilayer films as well as to chains of coupled micro-resonators.
description: Version 2, 12 pages, 9 figures
Synchronous Optical Pumping of Quantum Revival Beats for Atomic Magnetometery
Creators: name: Seltzer, S. J.
name: Meares, P. J.
name: Romalis, M. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We observe quantum beats with periodic revivals due to non-linear spacing of Zeeman levels in the ground state of potassium atoms and demonstrate their synchronous optical pumping by double modulation of the pumping light at the Larmor frequency and the revival frequency. We show that synchronous pumping increases the degree of spin polarization by a factor of 4. As a practical example, we explore the application of this double-modulation technique to atomic magnetometers operating in the geomagnetic field range and find that it can increase the sensitivity and reduce magnetic field orientation-dependent measurement errors endemic to alkali-metal magnetometers.
description: 4 pages
Size Matters
Creators: name: Richter, Mats L.
name: Byttner, Wolf
name: Krumnack, Ulf
name: Schallner, Ludwdig
name: Shenk, Justin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Fully convolutional neural networks can process input of arbitrary size by applying a combination of downsampling and pooling. However, we find that fully convolutional image classifiers are not agnostic to the input size but rather show significant differences in performance: presenting the same image at different scales can result in different outcomes. A closer look reveals that there is no simple relationship between input size and model performance (no `bigger is better'), but that each each network has a preferred input size, for which it shows best results. We investigate this phenomenon by applying different methods, including spectral analysis of layer activations and probe classifiers, showing that there are characteristic features depending on the network architecture. From this we find that the size of discriminatory features is critically influencing how the inference process is distributed among the layers.
description: Preprint
Optimised Hybrid Classical-Quantum Algorithm for Accelerated Solution of Sparse Linear Systems
Creators: name: Singh, Hakikat
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Efficiently solving large-scale sparse linear systems poses a significant challenge in computational science, especially in fields such as physics, engineering, machine learning, and finance. Traditional classical algorithms face scalability issues as the size of these systems increases, leading to performance degradation. On the other hand, quantum algorithms, like the Harrow-Hassidim-Lloyd (HHL) algorithm, offer exponential speedups for solving linear systems, yet they are constrained by the current state of quantum hardware and sensitivity to matrix condition numbers. This paper introduces a hybrid classical-quantum algorithm that combines CUDA-accelerated preconditioning techniques with the HHL algorithm to solve sparse linear systems more efficiently. The classical GPU parallelism is utilised to preprocess and precondition the matrix, reducing its condition number, while quantum computing is employed to solve the preconditioned system using the HHL algorithm. Additionally, the algorithm integrates machine learning models, particularly reinforcement learning, to dynamically optimise system parameters, such as block sizes and preconditioning stratgies, based on real-time performance data. Our experimental results show that the proposed approach not only surpasses traditional methods in speed and scalability but also mitigates some of the inherent limitations of quantum algorithms. This work pushes the boundaries of efficient computing and provides a foundation for future advancements in hybrid computational frameworks.
Rankin Ranch Cemetery (B-roll)
Creators: name: Girado, Luther
name: Hammond, Jon
name: Hernandez, Betty
name: Hicks, Lucille
name: Grant, Laura
name: Turner, Julie
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: This file, captured at a cemetery, contains a discussion between speakers regarding those who were buried there. This b-roll continues a discussion from an earlier file between speakers regarding those who were buried there.
Statistical properties of short term price trends in high frequency stock market data
Creators: name: Sieczka, Paweł
name: Hołyst, Janusz A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: We investigated distributions of short term price trends for high frequency stock market data. A number of trends as a function of their lengths was measured. We found that such a distribution does not fit to results following from an uncorrelated stochastic process. We proposed a simple model with a memory that gives a qualitative agreement with real data.
description: 10 pages, 9 figures, in ver. 2 one chapter added
Saturation Physics in Ultra High Energy Cosmic Rays: Heavy Quark Production
Creators: name: Goncalves, V. P.
name: Machado, M. V. T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this work we estimate the heavy quark production in the interaction of ultra high energy cosmic rays in the atmosphere, considering that the primary cosmic ray is a proton or a photon. At these energies the saturation momentum Q_{sat}^2 stays above the hard scale μ_c^2=4m_c^2, implying charm production probing the saturation regime. In particular, we show that the ep HERA data presents a scaling on τ_c = (Q^2+μ_c^2)/Q_{sat}^2. We derive our results considering the dipole picture and the Color Glass Condensate formalism, which one shows to be able to describe the heavy quark production in photon-proton and proton-proton collisions. Nuclear effects are considered in computation of cross sections for scattering on air nuclei. Implications on the flux of prompt leptons at the earth are analyzed and a large suppression is predicted.
description: 18 pages, 10 figures, 2 tables. Version to be published in JHEP
Dark energy, the colored anti-de Sitter vacuum, and LHC phenomenology
Creators: name: Stojkovic, Dejan
name: Starkman, Glenn D.
name: Matsuo, Reijiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the possibility that the current accelerated expansion of the universe is driven by the vacuum energy density of a colored scalar field which is responsible for a phase transition in which the gauge SU(3)_c symmetry breaks. We show that if we are stuck in a SU(3)_c - preserving false vacuum, then SU(3)_c symmetry breaking can be accommodated without violating any experimental QCD bounds or bounds from cosmological observations. Moreover, unless there is an unnatural fine-tuning beyond the usual cosmological constant fine-tuning, the true vacuum state of the universe is anti-de Sitter. The model can likely be tested at the LHC. A possible (though not necessary) consequence of the model is the existence of fractionally charged massive hadrons. The model can be embedded in supersymmetric theories where massive colored scalar fields appear naturally.
description: accepted for publication in Phys. Rev. D
Three-dimensional charge density wave and robust zero-bias conductance peak inside the superconducting vortex core of a kagome superconductor CsV$_3$Sb$_5$
Creators: name: Liang, Zuowei
name: Hou, Xingyuan
name: Zhang, Fan
name: Ma, Wanru
name: Wu, Ping
name: Zhang, Zongyuan
name: Yu, Fanghang
name: Ying, J. -J.
name: Jiang, Kun
name: Shan, Lei
name: Wang, Zhenyu
name: Chen, X. -H.
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: The transition-metal-based kagome metals provide a versatile platform for correlated topological phases hosting various electronic instabilities. While superconductivity is rare in layered kagome compounds, its interplay with nontrivial topology could offer an engaging space to realize exotic excitations of quasiparticles. Here, we use scanning tunneling microscopy (STM) to study a newly discovered Z$_2$ topological kagome metal CsV$_3$Sb$_5$ with a superconducting ground state. We observe charge modulation associated with the opening of an energy gap near the Fermi level. When across single-unit-cell surface step edges, the intensity of this charge modulation exhibits a π-phase shift, suggesting a three-dimensional 2$\times$2$\times$2 charge density wave ordering. Interestingly, a robust zero-bias conductance peak is observed inside the superconducting vortex core on the Cs 2$\times$2 surfaces that does not split in a large distance when moving away from the vortex center, resembling the Majorana bound states arising from the superconducting Dirac surface states in Bi$_2$Te$_3$/NbSe$_2$ heterostructures. Our findings establish CsV$_3$Sb$_5$ as a promising candidate for realizing exotic excitations at the confluence of nontrivial lattice geometry, topology and multiple electronic orders.
description: 13 pages, 4 figures, With supplementary materials (18 pages + 14 figures)
Virgo's Intracluster Globular Clusters as Seen by the Advanced Camera for Surveys
Creators: name: Williams, Benjamin F.
name: Ciardullo, Robin
name: Durrell, Patrick R.
name: Feldmeier, John J.
name: Sigurdsson, Steinn
name: Vinciguerra, Matt
name: Jacoby, George H.
name: von Hippel, Ted
name: Ferguson, Henry C.
name: Tanvir, Nial R.
name: Arnaboldi, Magda
name: Gerhard, Ortwin
name: Aguerri, J. Alfonso L.
name: Freeman, Ken C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of 4 candidate intracluster globular clusters (IGCs) in a single deep HST ACS field of the Virgo Cluster. We show that each cluster is roughly spherical, has a magnitude near the peak of the Virgo globular cluster luminosity function, has a radial profile that is best-fit by a King model, and is surrounded by an excess of point sources which have the colors and magnitudes of cluster red giant stars. Despite the fact that two of our IGC candidates have integrated colors redder than the mean of the M87 globular cluster system, we propose that all of the objects are metal-poor with [M/H] < -1. We show that the tidal radii of our intracluster globulars are all larger than the mean for Milky Way clusters, and suggest that the clusters have undergone less tidal stress than their Galactic counterparts. Finally, we normalize our globular cluster observations to the luminosity of intracluster stars, and derive a value of S_N ~ 6 for the specific frequency of Virgo intracluster globular clusters. We use these data to constrain the origins of Virgo's intracluster population, and suggest that globular clusters in our intracluster field have a different origin than globular clusters in the vicinity of M87. In particular, we argue that dwarf elliptical galaxies may be an important source of intracluster stars.
description: 24 pages, 1 table, 5 figures, accepted for publication in ApJ
The SDSS-DR5 Survey for Proximate Damped Lya Systems
Creators: name: Prochaska, Jason X.
name: Hennawi, Joseph F.
name: Herbert-Fort, Stephane
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using the Sloan Digital Sky Survey, Data Release 5, we survey proximate damped Lya systems (PDLAs): absorption line systems with HI column density N(HI)> 2x10^20 cm^{-2} at velocity separation dv < 3000 km/s from their background quasar. These absorbers are physically associated with their background quasars, and their statistics allow us to study quasar environments out to z~5. However, the large ionizing flux emitted by a quasar can ionize the neutral gas in a nearby galaxy possibly giving rise to a ``proximity effect'', analogous to the similar effect observed in the Lya forest. From a sample of 111 PDLAs, we measure the HI frequency distribution f(N), incidence, and gas mass density of the PDLAs near luminous quasars over the redshift interval z= 2.2 to 5. The incidence and mass density of PDLAs at z~3 is approximately twice that of intervening DLAs, but at z<2.5 and z>3.5 the f(N) distribution is consistent with the intervening population. We interpret the observed enhancement of PDLAs around quasars in terms of quasar-galaxy clustering, and compare the strength of the clustering signal to the expectation from independent measures of the respective clustering strengths of DLAs and quasars, as well as a complementary analysis of the clustering of absorbers around quasars in the transverse direction. We find that there are a factor of 5-10 fewer PDLAs around quasars than expected and interpret this result as evidence for the hypothesis that the ionizing flux from the quasars photoevaporates HI in nearby DLA galaxies, thus reducing their cross-section for DLA absorption. This constitues the first detection of a ``proximity effect'' for DLAs.
description: 12 pages, 10 figures. Submitted to ApJ. See http://www.ucolick.org/~xavier/SDSSDLA/index.html for supporting tables and figures
Rule 54: Exactly solvable model of nonequilibrium statistical mechanics
Creators: name: Buča, Berislav
name: Klobas, Katja
name: Prosen, Tomaž
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We review recent results on an exactly solvable model of nonequilibrium statistical mechanics, specifically the classical Rule 54 reversible cellular automaton and some of its quantum extensions. We discuss the exact microscopic description of nonequilibrium dynamics as well as the equilibrium and nonequilibrium stationary states. This allows us to obtain a rigorous handle on the corresponding emergent hydrodynamic description, which is treated as well. Specifically, we focus on two different paradigms of Rule 54 dynamics. Firstly, we consider a finite chain driven by stochastic boundaries, where we provide exact matrix product descriptions of the nonequilibrium steady state, most relevant decay modes, as well as the eigenvector of the tilted Markov chain yielding exact large deviations for a broad class of local and extensive observables. Secondly, we treat the explicit dynamics of macro-states on an infinite lattice and discuss exact closed form results for dynamical structure factor, multi-time-correlation functions and inhomogeneous quenches. Remarkably, these results prove that the model, despite its simplicity, behaves like a regular fluid with coexistence of ballistic (sound) and diffusive (heat) transport. Finally, we briefly discuss quantum interpretation of Rule 54 dynamics and explicit results on dynamical spreading of local operators and operator entanglement.
description: Review paper, 70 pages, 17 figures. To appear in JSTAT special issue 2021 "Emergent Hydrodynamics in Integrable Many-body Systems"; v2 minor modifications to improve presentation
Tipping induced by multiplexing on two layer networks
Creators: name: Verma, Umesh Kumar
name: Ambika, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We report the study of sudden transitions or tipping in a collection of systems induced due to multiplexing with another network of systems. The emergent dynamics of oscillators on one layer can undergo a sudden transition to steady state due to indirect coupling with a shared environment, mean field couplings and conjugate couplings among them. In all these cases, when multiplexed with another set of similar systems, the tipping phenomena are induced on the second layer also with a similar pattern of behaviour. We consider van der Pol oscillator as nodal dynamics with various network topologies like scale free and regular networks with local and nonlocal couplings. We also report how the coupling topology influences the nature of transitions on both layers, under multiplexing.
description: 16 pages, 11 figures
Excitation of an electronic band structure by a single-photon Fock state
Creators: name: Rose, H.
name: Vasil'ev, A.N.
name: Tikhonova, O.V.
name: Meier, T.
name: Sharapova, P.R.
Publisher: name: Zenodo
Year: 2021
Subjects: semiconductor quantum optics

description: In this report, we consider a semiconductor nanostructure in an optical cavity that is coupled to quantum light. We describe the semiconductor nanostructure with a parabolic band structure in a 1D k-space, while we assume a single-mode quantum field. The 1D
 system is chosen for simplicity in both the analytical and the numerical treatment and paves the way for the description of 2D structures in the future. Therefore, instead of using parameters which are realistic for 1D systems, we rather use parameters which qualitatively correspond to 2D GaAs structures.
description: Support by the joint grant of the Deutsche Forschungsgemeinschaft (DFG) and the Russian Science Foundation (RSF) (projects SH 1228/2-1, ME 1916/7-1, No.19-42-04105) is gratefully acknowledged.
CGC formalism with two sources
Creators: name: Hatta, Yoshitaka
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work we extend the JIMWLK formalism to the two-source problem. The S-matrix for the forward scattering can be written in a double functional integral representation which involves the usual functional integral for the gluon field and the spin path integral for the external color sources. Modifications needed in the light-cone gauge are discussed. Using our source term we compute the produced gluon field and discuss the duality of the high energy evolution kernel in the pA collision.
description: Improved derivation of light-cone gauge source terms, version to appear in Nucl. Phys. A
Adsorption of gas molecules on graphene nanoribbons and its implication for nano-scale molecule sensor
Creators: name: Huang, Bing
name: Li, Zuanyi
name: Liu, Zhirong
name: Zhou, Gang
name: Hao, Shaogang
name: Wu, Jian
name: Gu, Bing-Lin
name: Duan, Wenhui
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have studied the adsorption of gas molecules (CO, NO, NO2, O2, N2, CO2, and NH3) on graphene nanoribbons (GNRs) using first principles methods. The adsorption geometries, adsorption energies, charge transfer, and electronic band structures are obtained. We find that the electronic and transport properties of the GNR with armchair-shaped edges are sensitive to the adsorption of NH3 and the system exhibits n type semiconducting behavior after NH3 adsorption. Other gas molecules have little effect on modifying the conductance of GNRs. Quantum transport calculations further indicate that NH3 molecules can be detected out of these gas molecules by GNR based sensor.
description: 13 pages and 5 figures
Driving performance in mild dementia
Creators: name: Tallman, Karen S.
Publisher: name: University of British Columbia
Year: 2008

description: The automobile driving performance of 18 mildly demented subjects was compared to that of 18 normal elderly and 18 mid-age controls. Driving tasks were grouped according to a three-level hierarchical model that characterizes driving as a problem solving skill involving (a) low-level vehicle control skills, (b) intermediate level manoeuvring skills in response to on-road events, and (c) higher level driving-related judgemental abilities. Driving simulator measures of brake reaction time and steering accuracy were selected to represent the lowest level of hierarchy. A Motor Vehicle Branch (MVB) road test and a test of emergency braking distance indexed the intermediate level. Driving-related judgment was assessed by evaluating the accuracy of subjects' appraisals of their own driving skills, and by examining whether the demented subjects evidenced an increased level of driving avoidance that might be commensurate with the extent of their driving deficits. Overall the demented subjects performed significantly less well than did controls on the driving behaviour measures. Particularly striking were their deficits at the highest and lowest levels of the hierarchical task analysis. They were markedly impaired on the driving simulator tasks and they showed a clear tendency to over-estimate their driving competence relative to their actual performance. However, from a practical standpoint it was noted that despite significant group differences at the intermediate level, the overlap in performance scores between the demented and the normal elderly was considerable for these in-car tasks. Also, although the mildly demented subjects had significantly more demerit points on the MVB road test than did the elderly controls, nearly 70% were able to pass the licensing exam. Mildly demented drivers might best be characterized as having marginal driving abilities, a fact which may pose considerable challenges to clinicians and policy makers. A second component of the study involved evaluation of the correlations between the driving measures and several common psychometric tests of attention, perception, and psychomotor speed. After group membership was accounted for, the psychometric tests failed to add precision to the prediction of driving performance.
Critical Sample Aspect Ratio and Magnetic Field Dependence for Antiskyrmion Formation in Mn1.4PtSn Single-Crystals
Creators: name: Cespedes, Belen E. Zuniga
name: Vir, P.
name: Milde, Peter
name: Felser, C.
name: Eng, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Mn1.4PtSn is the first material in which antiskyrmions have been observed in ultra-thin single crystalline specimens. While bulk crystals exhibit fractal patterns of purely ferromagnetic domain ordering at room temperature, ultra-thin Mn1.4PtSn lamellae clearly show antiskyrmion lattices with lattice spacings up to several $μ$m. In the work presented here, we systematically investigate the thickness region from 400 nm to 10 $μ$m using 100 $\times$ 100 $μ$m$^2$ -wide Mn1.4PtSn plates, and identify the critical thickness-to-width aspect ratio $α_0 = 0.044$ for the ferromagnetic fractal domain to the non-collinear texture phase transition. Additionally, we also explore these non-collinear magnetic textures below the critical aspect ratio $α_0$ above and below the spin-reorientation transition temperature $T_{SR}$ while applying variable external magnetic fields. What we find is a strong hysteresis for the occurrence of an antiskyrmion lattice, since the antiskyrmions preferentially nucleate by pinching them off from helical stripes in the transition to the field polarized state.
Sand Canyon Store and Schoolhouse
Creators: name: Hammond, Jon
name: Hernandez, Betty
name: Hicks, Lucille
name: Grant, Laura
name: Turner, Julie
name: Durham, Kim
name: Everson, Merlene
name: Hicks, Josh
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: xaw

description: This file contains a conversation among speakers concerning events that occurred at the place where the recording was taken as children, a former schoolhouse that was later converted into a store
The unfair consequences of equal opportunities: comparing exchange models of wealth distribution
Creators: name: Caon, G. M.
name: Goncalves, S.
name: Iglesias, J. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: General Finance (q-fin.GN)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: Simple agent based exchange models are a commonplace in the study of wealth distribution of artificial societies. Generally, each agent is characterized by its wealth and by a risk-aversion factor, and random exchanges between agents allow for a redistribution of the wealth. However, the detailed influence of the amount of capital exchanged has not been fully analyzed yet. Here we present a comparison of two exchange rules and also a systematic study of the time evolution of the wealth distribution, its functional dependence, the Gini coefficient and time correlation functions. In many cases a stable state is attained, but, interesting, some particular cases are found in which a very slow dynamics develops. Finally, we observe that the time evolution and the final wealth distribution are strongly dependent on the exchange rules in a nontrivial way.
description: To appear in European Physical Journal B
Weyl's symbols of Heisenberg operators of canonical coordinates and momenta as quantum characteristics
Creators: name: Krivoruchenko, M. I.
name: Faessler, Amand
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The knowledge of quantum phase flow induced under the Weyl's association rule by the evolution of Heisenberg operators of canonical coordinates and momenta allows to find the evolution of symbols of generic Heisenberg operators. The quantum phase flow curves obey the quantum Hamilton's equations and play the role of characteristics. At any fixed level of accuracy of semiclassical expansion, quantum characteristics can be constructed by solving a coupled system of first-order ordinary differential equations for quantum trajectories and generalized Jacobi fields. Classical and quantum constraint systems are discussed. The phase-space analytic geometry based on the star-product operation can hardly be visualized. The statement "quantum trajectory belongs to a constraint submanifold" can be changed e.g. to the opposite by a unitary transformation. Some of relations among quantum objects in phase space are, however, left invariant by unitary transformations and support partly geometric relations of belonging and intersection. Quantum phase flow satisfies the star-composition law and preserves hamiltonian and constraint star-functions.
description: 27 pages REVTeX, 6 EPS Figures. New references added. Accepted for publication to JMP
Genetic, environmental, and physiological factors involved in the precocious sexual maturation of chinook salmon (Oncorhynchus tshawytscha)
Creators: name: Heath, Daniel D.
Publisher: name: University of British Columbia
Year: 2008

description: Male chinook salmon (Oncorhynchus tshawytscha), that mature sexually one year prior to females and after at least one summer in sea water, are known as jacks. A breeding experiment to test for genetic and environmental (temperature at early rearing) effects on the incidence of jacking in chinook salmon showed significant sire, dam, and environmental effects, as well as genotype-by-environment interactions. Heritability estimates for incidence of jacking based on sire-offspring regressions within dams were0.48 (± 0.24) and 0.32 (± 0.14) for the accelerated and non-accelerated groups respectively. DNA fingerprinting was used to detect differences in allele distribution between precocious males and randomly selected fish, such differences indicate genetic involvement. Two oligonucleotide DNA fingerprinting probes were developed, however the resulting banding patterns were judged unsuitable for this application. A novel extension of Random Amplification of Polymorphic DNA (RAPD) allowed the isolation of a single-locus DNA probe for chinook salmon. This probe and another developed for Atlantic salmon, were hybridized with DNA from 74 jacks and 94 females from farmed Chinook salmon (Robertson Creek stock; RC), and with DNA from 45 precociously mature and 56 non-mature chinook salmon parr from the Nicola River (NR). The allele distributions of the jack and female RC adults differed significantly, however, there was no difference between the precocious and non-maturing NR parr due, in part, to the relatively low genetic variability of that stock. The weight-frequency distributions for three year classes of chinook salmon became significantly bimodal in the May prior to maturation due to faster growth of the jacks, relative to the non-maturing fish, from April to June. Plasma cortisol, T3, and testosterone concentrations were measured for one of those year classes during the spring and summer. No significant difference between the jacks and non-maturing fish were found for cortisol; however, T3 levels were higher in the jacks in March, and testosterone levels were higher in the jacks throughout the spring and summer. Only T3 levels were correlated (negatively) with growth in the jacks. A correlation analysis using the full- and half-sib families in the breeding experiment showed that growth-related variables did not predict jacking rates, although resting plasma glucose concentration, dam weight, and weight difference between the jacks and non-mature fish at the final sample were significantly correlated with jacking rate. The implications of these finding are discussed with respect to evolutionary theory, aquaculture, and chinook salmon physiology.
Lattice Boltzmann simulation of three-phase flows with moving contact lines on curved surfaces
Creators: name: Li, Sheng
name: Lu, Yang
name: Jiang, Fei
name: Liu, Haihu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A numerical method for simulating three-phase flows with moving contact lines on arbitrarily complex surfaces is developed in the framework of lattice Boltzmann method. In this method, the immiscible three-phase flow is modeled through a multiple-relaxation-time color-gradient model, which not only allows for a full range of interfacial tensions but also produces stable outcomes for a wide range of viscosity ratios. A characteristic line model is introduced to implement the wetting boundary condition, which is not only easy to implement but also able to handle arbitrarily complex boundaries with prescribed contact angles. The developed method is first validated by the simulation of a Janus droplet resting on a flat surface, a perfect Janus droplet deposited on a cylinder, and the capillary intrusion of ternary fluids for various viscosity ratios. It is then used to study a compound droplet subject to a uniform incoming flow passing through a multi-pillar structure, where three different values of surface wettability are considered. The simulated results show that the surface wettability has significant impact on the droplet dynamic behavior and final fluid distribution.
The Chandra View of Galaxy Mergers
Creators: name: Brassington, N. J.
name: Ponman, T. J.
name: Read, A. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: From a Chandra survey of nine interacting galaxy systems the evolution of X-ray emission during the merger process has been investigated. It is found that the X-ray luminosity peaks ~300 Myr before nuclear coalescence, and then dips, even though we know that rapid and increasing activity is still taking place at this time. It is likely that this drop in X-ray luminosity is a consequence of outflows breaking out of the galactic discs of these systems. In this work it is also shown that, for the systems close to the point of nuclear coalescence, Lfir becomes massively enhanced compared to the X-ray luminosity of these systems. We suggest that this enhancement may indicate a `top heavy' IMF, with an enhanced fraction of massive stars. At a time ~1 Gyr after coalescence, the merger-remnants in our sample are X-ray faint when compared to typical mature elliptical galaxies. However, we do see evidence that these systems will start to resemble typical elliptical galaxies at a greater dynamical age, given the properties of the 3 Gyr system within our sample, supporting the idea that halo regeneration will take place within low Lx merger-remnants. Also as a part of this survey, detailed Chandra observations for the double nucleus merger system Mkn 266 and the merger-remnant Arp 222 are presented for the first time.
description: 20 pages, 18 figures, accepted for publication in MNRAS. A high resolution version of this paper can be downloaded from http://hea-www.harvard.edu/~nbrassington/merger.ps
On gyration radius distributions of star-like macromolecules
Creators: name: Budkov, Yu. A.
name: Kolesnikov, A. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Using the path integral approach, we obtain the characteristic functions of the gyration radius distributions for Gaussian star and Gaussian rosette macromolecules. We derive the analytical expressions for cumulants of the both distributions. Applying the steepest descent method, we estimate the probability distribution functions of the gyration radius in the limit of a large number of star and rosette arms in two limiting regimes: for strongly expanded and strongly collapsed macromolecules. We show that in both cases, in the regime of a large gyration radius relative to its mean-square value, the probability distribution functions can be described by the Gaussian functions. In the shrunk macromolecule regime, both distribution functions tend to zero faster than any power of the gyration radius. Based on the asymptotic behavior of the distribution functions and the behavior of statistical dispersions, we demonstrate that the probability distribution function for the rosette is more densely localized near its maximum than that for the star polymer. We construct the interpolation formula for the gyration radius distribution for the Gaussian star macromolecule which can help to take into account the conformational entropy of the flexible star macromolecules within the Flory-type mean-field theories
description: Submitted to the Journal of Statistical Mechanics: Theory and Experiment
Scaling properties of $q$-breathers in nonlinear acoustic lattices
Creators: name: Kanakov, O. I.
name: Flach, S.
name: Ivanchenko, M. V.
name: Mishagin, K. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Recently $q$-breathers - time-periodic solutions which localize in the space of normal modes and maximize the energy density for some mode vector $q_0$ - were obtained for finite nonlinear lattices. We scale these solutions together with the size of the system to arbitrarily large lattices. We generalize previously obtained analytical estimates of the localization length of $q$-breathers. The first finding is that the degree of localization depends only on intensive quantities and is size independent. Secondly a critical wave vector $k_m$ is identified, which depends on one effective nonlinearity parameter. $q$-breathers minimize the localization length at $k_0=k_m$ and completely delocalize in the limit $k_0 \to 0$.
description: 4 pages, 5 figures