cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Primordial black holes from D-parity breaking in SO(10) grand unified theory
Creators: name: Mishra, Sasmita
name: Yajnik, Urjit A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The growing evidence of gravitational waves from binary black hole mergers has renewed the interest in study of primordial black holes (PBH). Here we study a mechanism for the formation of PBH from collapse of pseudo-topological domain walls which form out of equilibrium during inflation and then collapse post inflation. We apply the study to domain wall formation due to $D$-parity embedded in a supersymmetric grand unified theory (GUT) based on $SO(10)$ and compare the abundance of resulting PBH with the existing constraints. Thus the macroscopic relics can then be used to constrain or rule out a GUT, or demand a refinement of the theory of PBH formation in this class of GUTs.
description: 16 pages, 4 figures
The Source of Solar Energy, ca. 1840-1910: From Meteoric Hypothesis to Radioactive Speculations
Creators: name: Kragh, Helge
Publisher: name: arXiv
Year: 2016
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: Why does the Sun shine? Today we know the answer to the question and we also know that earlier answers were quite wrong. The problem of the source of solar energy became an important part of physics and astronomy only with the emergence of the law of energy conservation in the 1840s. The first theory of solar heat based on the new law, due to J. R. Mayer, assumed the heat to be the result of meteors or asteroids falling into the Sun. A different and more successful version of gravitation-to-heat energy conversion was proposed by H. Helmholtz in 1854 and further developed by W. Thomson. For more than forty years the once so celebrated Helmholtz-Thomson contraction theory was accepted as the standard theory of solar heat despite its prediction of an age of the Sun of only 20 million years. In between the gradual demise of this theory and the radically different one based on nuclear processes there was a period in which radioactivity was considered a possible alternative to gravitational contraction. The essay discusses various pre-nuclear ideas of solar energy production, including the broader relevance of the question as it was conceived in the Victorian era.
description: 44 pages, 4 figures, submission to European Physical Journal H
Suspending superconducting qubits by silicon micromachining
Creators: name: Chu, Y.
name: Axline, C.
name: Wang, C.
name: Brecht, T.
name: Gao, Y. Y.
name: Frunzio, L.
name: Schoelkopf, R. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present a method for relieving aluminum 3D transmon qubits from a silicon substrate using micromachining. Our technique is a high yield, one-step deep reactive ion etch that requires no additional fabrication processes, and results in the suspension of the junction area and edges of the aluminum film. The drastic change in the device geometry affects both the dielectric and flux noise environment experienced by the qubit. In particular, the participation ratios of various dielectric interfaces are significantly modified, and suspended qubits exhibited longer $T_1$'s than non-suspended ones. We also find that suspension increases the flux noise experienced by tunable SQUID-based qubits.
description: Main text: 4 pages, 3 figures. Supplementary materials: 6 pages, 5 figures
Disordered Hyperuniform Heterogeneous Materials
Creators: name: Torquato, Salvatore
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Disordered hyperuniform many-body systems are distinguishable states of matter that lie between a crystal and liquid: they are like perfect crystals in the way they suppress large-scale density fluctuations and yet are like liquids or glasses in that they are statistically isotropic with no Bragg peaks. These systems play a vital role in a number of fundamental and applied problems: glass formation, jamming, rigidity, photonic and electronic band structure, localization of waves and excitations, self-organization, fluid dynamics, quantum systems, and pure mathematics. systems. Here, we derive new rigorous criteria that disordered hyperuniform two-phase heterogeneous materials must obey and explore their consequences. Two-phase heterogeneous media are ubiquitous, examples include composites and porous media, biological media, foams, polymer blends, granular media, cellular solids, and colloids. We rigorously establish the requirements for sphere packings to be "multihyperuniform." We apply realizability conditions for an autocovariance function and its associated spectral density of a two-phase medium, and then incorporate hyperuniformity as a constraint in order to derive new conditions. We show that some functional forms can immediately be eliminated from consideration and identify other forms that are allowable. Specific examples and counterexamples are described. Contact is made with well-known microstructural models as well as irregular phase-separation and Turing-type patterns. We also ascertain a family of spectral densities that are realizable by disordered hyperuniform two-phase media in any space dimension, and present explicit constructions. These studies provide insight into the nature of disordered hyperuniformity in the context of heterogeneous materials and have implications for the design of such novel amorphous materials.
description: 30 page, 10 figures, in press, Journal of Physics: Condensed Matter 2016. arXiv admin note: text overlap with arXiv:1607.08814
Exact Casimir interaction of perfectly conducting three-spheres in four euclidean dimensions
Creators: name: Bimonte, Giuseppe
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Exploiting conformal symmetry, we derive a simple exact formula for the classical electromagnetic Casimir interaction of two perfectly conducting three-spheres, including the sphere-plate geometry as a special case, in four euclidean dimensions. We verify that the short distance expansion of the Casimir energy agrees to leading order with the Proximity Force Approximation (PFA), while the next-to-leading-order is in agreement with a recently proposed derivative expansion of the Casimir energy. At the next-to-next-to-leading order we find a non-analytic correction to PFA, which for a sphere-plate system is of the order of $(d/R)^{3/2} \log(d/R)$, where $d$ is the separation and $R$ the sphere radius.
description: 19 pages, 2 figures
A Cut Finite Element Method for the Bernoulli Free Boundary Value Problem
Creators: name: Burman, Erik
name: Elfverson, Daniel
name: Hansbo, Peter
name: Larson, Mats G.
name: Larsson, Karl
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We develop a cut finite element method for the Bernoulli free boundary problem. The free boundary, represented by an approximate signed distance function on a fixed background mesh, is allowed to intersect elements in an arbitrary fashion. This leads to so called cut elements in the vicinity of the boundary. To obtain a stable method, stabilization terms is added in the vicinity of the cut elements penalizing the gradient jumps across element sides. The stabilization also ensures good conditioning of the resulting discrete system. We develop a method for shape optimization based on moving the distance function along a velocity field which is computed as the $H^1$ Riesz representation of the shape derivative. We show that the velocity field is the solution to an interface problem and we prove an a priori error estimate of optimal order, given the limited regularity of the velocity field across the interface, for the the velocity field in the $H^1$ norm. Finally, we present illustrating numerical results.
Axion Free-kick Misalignment Mechanism
Creators: name: Xu, Ling-Xiao
name: Yun, Seokhoon
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We propose an alternative scenario for the axion misalignment mechanism based on the nontrivial interplay between the axion and a light dilaton in the early universe. Dark matter abundance is still sourced by the initial misalignment of the axion field, whose motion along the potential kicks the dilaton field away from its minimum, and dilaton starts to oscillate later with a delayed onset time for oscillation and a relatively large misalignment value due to the kick; eventually the dilaton dominates over the axion in their energy densities, and the dilaton is identified as dark matter. The kick effect due to axion motion is the most significant if the initial field value of dilaton is near its minimum; therefore, we call this scenario axion free-kick misalignment mechanism, where axion plays the role similar to a football player. Dark matter abundance can be obtained with a lower axion decay constant compared to the conventional misalignment mechanism.
description: v2: 5+3 pages, 4 figures, references added, typo fixed, some improvements, results unchanged
Detection of a hot molecular core in the Large Magellanic Cloud with ALMA
Creators: name: Shimonishi, Takashi
name: Onaka, Takashi
name: Kawamura, Akiko
name: Aikawa, Yuri
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the first detection of a hot molecular core outside our Galaxy based on radio observations with ALMA toward a high-mass young stellar object (YSO) in a nearby low metallicity galaxy, the Large Magellanic Cloud (LMC). Molecular emission lines of CO, C17O, HCO+, H13CO+, H2CO, NO, SiO, H2CS, 33SO, 32SO2, 34SO2, and 33SO2 are detected from a compact region (0.1 pc) associated with a high-mass YSO, ST11. The temperature of molecular gas is estimated to be higher than 100 K based on rotation diagram analysis of SO2 and 34SO2 lines. The compact source size, warm gas temperature, high density, and rich molecular lines around a high-mass protostar suggest that ST11 is associated with a hot molecular core. We find that the molecular abundances of the LMC hot core are significantly different from those of Galactic hot cores. The abundances of CH3OH, H2CO, and HNCO are remarkably lower compared with Galactic hot cores by at least 1-3 orders of magnitude. We suggest that these abundances are characterized by the deficiency of molecules whose formation requires the hydrogenation of CO on grain surfaces. In contrast, NO shows a high abundance in ST11 despite the notably low abundance of nitrogen in the LMC. A multitude of SO2 and its isotopologue line detections in ST11 imply that SO2 can be a key molecular tracer of hot core chemistry in metal-poor environments. Furthermore, we find molecular outflows around the hot core, which is the second detection of an extragalactic protostellar outflow. In this paper, we discuss physical and chemical characteristics of a hot molecular core in the low metallicity environment.
description: 29 pages, 12 figures, Accepted for publication in ApJ
A 2.5-dimensional viscous, resistive, advective magnetized accretion-outflow coupling in black hole systems: A higher order polynomial approximation. I
Creators: name: Ghosh, Shubhrangshu
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The correlated and coupled dynamics of accretion and outflow around black holes (BHs) are essentially governed by the fundamental laws of conservation as outflow extracts matter, momentum and energy from the accretion region. Here we analyzed a robust form of 2.5-dimensional viscous, resistive, advective magnetized accretion-outflow coupling in BH systems, in the mean field magnetohydrodynamical (MHD) regime. We solve the complete set of coupled MHD conservation equations self-consistently, through invoking a generalized polynomial expansion in two dimensions. We perform a critical analysis of accretion-outflow region and provide a complete quasi-analytical family of solutions for advective flows. We obtain the physical plausible outflow solutions at high turbulent viscosity parameter $α\, (\ge 0.3)$, and at a reduced scale-height, as magnetic stresses compress or squeeze the flow region. We found that the value of the large-scale poloidal magnetic field $\bar B_P$ is enhanced with increasing geometrical thickness of the accretion flow. On the other hand differential magnetic torque ($-r^2 \bar B_φ \bar B_z$) increases with the increase in $\dot M$. $\bar B_P$, $-r^2 \bar B_φ \bar B_z$ as well as the plasma beta $β_P$ get strongly augmented with the increase in the value of $α$, enhancing the transport of vertical flux outwards. Our solutions indicate that magnetocentrifugal acceleration plausibly plays a dominant role in effusing out plasma from the radial accretion flow in moderately advective paradigm which are more centrifugally dominated, however in strongly advective paradigm it is likely that the thermal pressure gradient would play a more contributory role in the vertical transport of the plasma.
description: 27 pages, 9 figures, 10 tables
D6.2 – First report on the status of organisation of training events and activities, including validation surveys. V1.0
Creators: name: Stich, Ivan
Publisher: name: Zenodo
Year: 2022
Subjects: QMC
TREX Training Programme

description: The current document D6.2 describes and details the structure of the training and education strategy and the plans of the events that have taken place at the time of writing and those planned for the remaining project lifetime. Various criteria are used to sort most of the planned activities: a distinction is made based on the subject (HPC, quantum chemistry), between the planned, upcoming and future events, between events internal to the consortium and events open to external audiences. Document D6.2 is structured into 6 Chapters. Chapter 2 outlines the overall training and education strategy. Internal training and education activities are described in Chapter 3. The largest section, Chapter 4, describes the activities open to external audiences. Chapter 5 deals with the impact of the events. Chapter 6 gives the summary and perspectives.
Spin- and angle-resolved photoemission on the topological Kondo Insulator candidate: SmB6
Creators: name: Xu, N.
name: Ding, H.
name: Shi, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Topological Kondo insulators are a new class of topological insulators in which metallic surface states protected by topological invariants reside in the bulk band gap at low temperatures. Unlike other three-dimensional topological insulators, a truly insulating bulk state, which is critical for potential applications in next-generation electronic devices, is guaranteed by many-body effects in the topological Kondo insulator. Furthermore, the system has strong electron correlations that can serve as a testbed for interacting topological theories. This topical review focuses on recent advances in the study of SmB6, the most promising candidate for a topological Kondo insulator, from the perspective of spin- and angle-resolved photoemission spectroscopy with highlights of some important transport results.
description: 72 pages, 23 figures, invited review article
Pressure-Strain Interaction: III. Particle-in-Cell Simulations of Magnetic Reconnection
Creators: name: Barbhuiya, M. Hasan
name: Cassak, Paul A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: How energy is converted into thermal energy in weakly collisional and collisionless plasma processes such as magnetic reconnection and plasma turbulence has recently been the subject of intense scrutiny. The pressure-strain interaction has emerged as an important piece, as it describes the rate of conversion between bulk flow and thermal energy density. In two companion studies, we presented an alternate decomposition of the pressure-strain interaction to isolate the effects of converging/diverging flow and flow shear instead of compressible and incompressible flow, and we derived the pressure-strain interaction in magnetic field-aligned coordinates. Here, we use these results to study pressure-strain interaction during two-dimensional anti-parallel magnetic reconnection. We perform particle-in-cell simulations and plot the decompositions in both Cartesian and magnetic field-aligned coordinates. We identify the mechanisms contributing to positive and negative pressure-strain interaction during reconnection. This study provides a roadmap for interpreting numerical and observational data of the pressure-strain interaction, which should be important for studies of reconnection, turbulence, and collisionless shocks.
description: 18 pages, 7 figures, accepted to Physics of Plasmas
Properties of an ultrarelativistic charged particle radiation in a constant homogeneous crossed electromagnetic field
Creators: name: Bogdanov, O. V.
name: Kazinski, P. O.
name: Lazarenko, G. Yu.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The properties of radiation created by a classical ultrarelativistic scalar charged particle in a constant homogeneous crossed electromagnetic field are described both analytically and numerically with radiation reaction taken into account in the form of the Landau-Lifshitz equation. The total radiation naturally falls into two parts: the radiation formed at the entrance point of a particle into the crossed field (the synchrotron entrance radiation), and the radiation coming from the late-time asymptotics of a particle motion (the de-excited radiation). The synchrotron entrance radiation resembles, although does not coincide with, the ultrarelativistic limit of the synchrotron radiation: its distribution over energies and angles possesses almost the same properties. The de-excited radiation is soft, not concentrated in the plane of motion of a charged particle, and almost completely circularly polarized. The photon energy delivering the maximum to its spectral angular distribution decreases with increasing the initial energy of a charged particle, while the maximum value of this distribution remains the same at the fixed observation angle. The ultraviolet and infrared asymptotics of the total radiation are also described.
description: 14 pp, 3 figs
Improving the discoverability of open access books: metadata challenges and opportunities
Creators: name: Booth, Emma
Publisher: name: University of Manchester
Year: 2023
Subjects: Other education not elsewhere classified

description: Research funders and academic institutions are increasingly adopting Open Research policies in order to develop a richer, more diverse and accessible world of scholarly communication. As academic institutions start actively encouraging or mandating that long-form research outputs, such as scholarly books, be made available open access, they also need to be confident that this content can be embedded into academic library collections in the same way as gated or paywalled content.
 This breakout session will examine how OA Books can struggle to find their way through established library acquisitions and metadata supply chains, and what can be done to face this challenge and ultimately improve the discoverability of Open Access Books.
Viability of Online Gambling Disorder Screening: An Exploratory Study
Creators: name: LaPlante, Debi
name: Matykiewicz, Caitlyn
name: Nelson, Sarah E
name: Gray, Heather
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Social and Behavioral Sciences
subject: Gambling Disorder
subject: Gambling Disorder Screening Day
subject: gambling
subject: screen
subject: screening

description: Public health screening day events promote awareness and treatment engagement for a diversity of disorders by exposing people to brief screening experiences and providing pertinent resources and referrals as needed. A decade ago, the Division on Addiction at Cambridge Health Alliance, a Harvard Medical School teaching hospital initiated a grassroots effort to support Gambling Disorder Screening Day on the second Tuesday of March annually. Individuals and organizations across the U.S. and around the world have embraced Gambling Disorder Screening Day, often using traditional screening day approaches (e.g., in-person paper-pencil screening). Yet, there is room to expand participation in Gambling Disorder Screening Day by using novel screening day approaches. The current project explores the possibility of using online survey panels to conduct large-scale screening for gambling-related problems and provide appropriate resources and referrals. More specifically, in a two-part pilot study involving 1,000 vetted MTurk workers, we will examine key questions related to screening participation, and quality of engagement in screening and follow up recommendations.
Test of the photon detection system for the LHCb RICH Upgrade in a charged particle beam
Creators: name: Baszczyk, M. K.
name: Benettoni, M.
name: Calabrese, R.
name: Cardinale, R.
name: Carniti, P.
name: Cassina, L.
name: Cavallero, G.
name: Cojocariu, L.
name: Ramusino, A. Cotta
name: D'Ambrosio, C.
name: Dorosz, P. A.
name: Easo, S.
name: Eisenhardt, S.
name: Fiorini, M.
name: Frei, C.
name: Gambetta, S.
name: Gibson, V.
name: Gotti, C.
name: Harnew, N.
name: He, J.
name: Keizer, F.
name: Kucewicz, W.
name: Maciuc, F.
name: Maino, M.
name: Malaguti, R.
name: Matteuzzi, C.
name: McCann, M.
name: Morris, A.
name: Muheim, F.
name: Papanestis, A.
name: Pessina, G.
name: Petrolini, A.
name: Piedigrossi, D.
name: Pistone, A.
name: Placinta, V. M.
name: Sigurdsson, S.
name: Simi, G.
name: Smith, J.
name: Spradlin, P.
name: Tomassetti, L.
name: Wotton, S. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The LHCb detector will be upgraded to make more efficient use of the available luminosity at the LHC in Run III and extend its potential for discovery. The Ring Imaging Cherenkov detectors are key components of the LHCb detector for particle identification. In this paper we describe the setup and the results of tests in a charged particle beam, carried out to assess prototypes of the upgraded opto-electronic chain from the Multi-Anode PMT photosensor to the readout and data acquisition system.
description: 25 pages, 22 figures
On $κ$-pseudocompactess and uniform homeomorphisms of function spaces
Creators: name: Krupski, Mikołaj
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 54C35, 54D30, 54E15

description: A Tychonoff space $X$ is called $κ$-pseudocompact if for every continuous mapping $f$ of $X$ into $\mathbb{R}^κ$ the image $f(X)$ is compact. This notion generalizes pseudocompactness and gives a stratification of spaces lying between pseudocompact and compact spaces. It is well known that pseudocompactness of $X$ is determined by the uniform structure of the function space $C_p(X)$ of continuous real-valued functions on $X$ endowed with the pointwise topology. In respect of that A.V. Arhangel'skii asked in [Topology Appl., 89 (1998)] if analogous assertion is true for $κ$-pseudocompactness. We provide an affirmative answer to this question.
Time-resolved spectroscopy with entangled photons
Creators: name: Kalashnikov, Dmitry A.
name: Melik-Gaykazyan, Elizaveta V.
name: Kalachev, Alexey A.
name: Yu, Ye Feng
name: Kuznetsov, Arseniy I.
name: Krivitsky, Leonid A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Interaction of light with media often occurs with a femtosecond response time. Its measurement by conventional techniques requires the use of femtosecond lasers and sophisticated time-gated optical detection1-3. Here we demonstrate that by exploiting quantum interference of entangled photons it is possible to measure the phase relaxation time of a media on the femtosecond time scale (down to 100 fs) using accessible continuous wave laser and single-photon counting. We insert the sample in the Hong-Ou-Mandel interferometer4 and infer the phase relaxation time from the modification of the two-photon interference pattern. In addition to its simplicity and ease of use, the technique does not require compensation of group velocity dispersion5-8 and does not induce photo-damage of the samples. This technique will be useful for characterization of ultrafast phase relaxation processes in material science, chemistry, and biology.
description: Submitted for publication
POSTER - I Simpósio de Fisiologia e Farmacologia de Peixes Teleósteos do Sul e Sudeste do Pará - UNIFESSPA
Creators: name: dos Santos Almeida, Carlos Eduardo
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 520202
subject: Behavioural neuroscience

description: Based on evidence that supports the participation of the nitrergic system in the consolidation of the stress response, the present work sought to evaluate the role of cGMP produced by the nitric oxide (NO) signaling pathway in the sensitization of anxiety-like responses observed in an animal model of Post-Traumatic Stress (PTSD). 208 paulistinhas (Danio rerio, Hamilton, 1822) of the longfin phenotype were treated with an inhibitor of the enzyme soluble guanylate cyclase (ODQ; 3.33 mg/kg, i.p.) or with vehicle (10% DMSO, i.p.) for 30 or 90 minutes after exposure to the alarm substance (SA) or distilled water (CTRL). Behavior was analyzed 24 hours after exposure using the light/dark preference test, considering the parameters scototaxis, erratic swimming, risk assessment, thigmotaxis, freezing, jumping, duration of entries, and number of entries into the white compartment. Within 30 minutes, treatment with ODQ was able to reverse the sensitization observed in scototaxis and erratic swimming, also increasing the duration of entries into the white compartment. In the ODQ treatment occurring 90 minutes after exposure to SA, an increase in risk assessment episodes and the frequency of entries was observed, as well as a decrease in the duration of such entries in the white compartment. It is suggested that cGMP plays a role in the initial phase of the anxiety-like responses observed in the process of adaptation to stress, while it intensely influences cognition in a later phase of this response.
The non-linear perturbation of a black hole by gravitational waves. II. Quasinormal modes and the compactification problem
Creators: name: Frauendiener, Jörg
name: Stevens, Chris
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently, Friedrich's Generalized Conformal Field Equations (GCFE) have been implemented numerically and global quantities such as the Bondi energy and the Bondi-Sachs mass loss have been successfully calculated directly on null-infinity. Although being an attractive option for studying global quantities by way of local differential geometrical methods, how viable are the GCFE for study of quantities arising in the physical space-time? In particular, how long can the evolution track phenomena that need a constant proper physical timestep to be accurately resolved? We address this question by studying the curvature oscillations induced on the Schwarzschild space-time by a non-linear gravitational perturbation. For small enough amplitudes, these are the well approximated by the linear quasinormal modes, where each mode rings at a frequency determined solely by the Schwarzschild mass. We find that the GCFE can indeed resolve these oscillations, which quickly approach the linear regime, but only for a short time before the compactification becomes ``too fast'' to handle numerically.
description: 19 pages, 8 figures, submitted to CQG
Supplementary document for Practical tests for sub-Rayleigh source discriminations with imperfect demultiplexers - 6787351.pdf
Creators: name: Schlichtholz, Konrad
name: Linowski, Tomasz
name: Walschaers, Mattia
name: Treps, Nicolas
name: Rudnicki, Lukasz
name: Sorelli, Giacomo
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Supplemental document, which contains detailed calculations and derivations of the results with additional discussion.
Exploring anomalous $HZγ$ couplings in $γ$-proton collisions at the LHC
Creators: name: Monfared, S. Taheri
name: Fayazbakhsh, Sh.
name: Najafabadi, M. Mohammadi
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The $HZγ$ coupling, which is highly sensitive to the new physics beyond the standard model, is studied through the process $pp\rightarrow pγp\rightarrow pHX$ at the LHC. To this purpose, an effective Lagrangian, in a model independent approach, with dimension six operators is considered in this paper. New interaction terms regarding beyond the standard model physics include the Higgs boson anomalous vertices in both CP-even and CP-odd structures. A detailed numerical analysis is performed to scrutinize the accurate constraints on the effective $HZγ$ couplings and to discuss how far the corresponding bounds can be improved. This is achieved by testing all the efficient Higgs decay channels and increasing the integrated luminosity at three different forward detector acceptance regions. The numerical results propose that the Higgs photoproduction at the LHC, as a complementary channel, has a great potential of exploring the $HZγ$ couplings.
description: 16 pages, 5 figures, 5 tables, version accepted for publication in PLB
Regular continuum systems of point particles. I: systems without interaction
Creators: name: Chubarikov, V. N.
name: Lykov, A. A.
name: Malyshev, V. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82C03

description: Normally, in mathematics and physics, only point particle systems, which are either finite or countable, are studied. We introduce new formal mathematical object called regular continuum system of point particles (with continuum number of particles). Initially, each particle is characterized by the pair: (initial coordinate, initial velocity) in $R^{2d}$. Moreover, all initial coordinates are different and fill up some domain in $R^{d}$. Each particle moves via normal Newtonian dynamics under influence of some external force, but there is no interaction between particles. If the external force is bounded then trajectories of any two particles in the phase space do not intersect. More exactly, at any time moment any two particles have either different coordinates or different velocities. The system is called regular if there are no particle collisions in the coordinate space. The regularity condition is necessary for the velocity of the particle, situated at a given time at a given space point, were uniquely defined. Then the classical Euler equation for the field of velocities has rigorous meaning. Though the continuum of particles is in fact a continuum medium, the crucial notion of regularity was not studied in mathematical literature. It appeared that the seeming simplicity of the object (absence of interaction) is delusive. Even for simple external forces we could not find simple necessary and sufficient regularity conditions. However, we found a rich list of examples, one-dimensional and mufti-dimensional, where we could get regularity conditions on different time intervals. In conclusion we formulate many unsolved problems for regular systems with interaction.
Fingering instability of a suspension film spreading on a spinning disk
Creators: name: Kulkarni, Mayuresh
name: Sahoo, Subhadarshinee
name: Doshi, Pankaj
name: Orpe, Ashish V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The spreading of a thin film of suspension on a spinning disk and the accompanying contact line instability is studied through flow visualization experiments. The critical radius for the onset of instability shows an increase with increase in the particle fraction ($ϕ_{p}$) before decreasing slightly at the highest value of $ϕ_{p}$ studied, while the instability wavelength ($λ$) exhibits a non-monotonic dependence. The value of $λ$ is close to that for a partially wetting liquid at lower $ϕ_{p}$, it decreases with increasing $ϕ_{p}$ to a minimum before increasing again at largest $ϕ_{p}$. The non-monotonic trends observed for $λ$ are discussed in light of the linear stability analysis of thin film equations derived for suspensions by Cook {\it et al.} [Linear stability of particle-laden thin films, Eur. Phys. J.: Spec. Top. {\bf 166}, 77 (2009)] and Balmforth {\it et al.} [Surface tension driven fingering of a viscoplastic film, J. Non Newtonian Fluid Mech. {\bf 142}, 143 (2007)].
description: 8 pages, 6 figures
Algorytm inspirowany polem walki - połączenie algorytmów numerycznych z ideą roju.
Creators: name: Baumgart, Jan
name: Sangho, Belco
Publisher: name: Studia i Materiały Informatyki Stosowanej
Year: 2021

description: Artykuł przedstawia przygotowany algorytm na bazie połączenia idei znanych metod numerycznych z metodami opartymi na idei roju. Algorytm został przygotowany z inspiracji polem walki podczas którego w równych odstępach żołnierze przeczesują siły wroga z różnymi prędkościami zależnie od posiadanego orężu a następnie ograniczają zakres pola bitwy. Zaproponowane rozwiązanie wywodzi się właśnie ze zbliżonych założeń. Głównym założeniem pracy było przedstawienie potencjalnego zysku z połączenia metod optymalizacji oraz porównanie metody mieszanej z metodami bazującymi na idei roju pod względem prędkości działania oraz skuteczności odnajdowania optimum globalnego.Algorytm został porównany z dwoma algorytmami metaheurystycznymi pod kątem dokładności odnalezionych rozwiązań oraz prędkości. Zgodnie z wynikami eksperymentów posiada wydajność podobną w porównaniu z innymi algorytmami oraz daje zadowalające efekty w wykorzystaniu.
description: Studia i Materiały Informatyki Stosowanej, Tom 13 Nr 2 (2021): Studia i Materiały Informatyki Stosowanej
Where is the Goldmine? Finding Promising Business Locations through Facebook Data Analytics
Creators: name: Lin, Jovian
name: Oentaryo, Richard
name: Lim, Ee-Peng
name: Vu, Casey
name: Vu, Adrian
name: Kwee, Agus
Publisher: name: arXiv
Year: 2016
Subjects: subject: Social and Information Networks (cs.SI)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: If you were to open your own cafe, would you not want to effortlessly identify the most suitable location to set up your shop? Choosing an optimal physical location is a critical decision for numerous businesses, as many factors contribute to the final choice of the location. In this paper, we seek to address the issue by investigating the use of publicly available Facebook Pages data---which include user check-ins, types of business, and business locations---to evaluate a user-selected physical location with respect to a type of business. Using a dataset of 20,877 food businesses in Singapore, we conduct analysis of several key factors including business categories, locations, and neighboring businesses. From these factors, we extract a set of relevant features and develop a robust predictive model to estimate the popularity of a business location. Our experiments have shown that the popularity of neighboring business contributes the key features to perform accurate prediction. We finally illustrate the practical usage of our proposed approach via an interactive web application system.
On eigenvalue bounds for a general class of Sturm-Liouville operators
Creators: name: Seifert, Christian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider Sturm-Liouville operators with measure-valued weight and potential, and positive, bounded diffusion coefficient which is bounded away from zero. By means of a local periodicity condition, which can be seen as a quantitative Gordon condition, we prove a bound on eigenvalues for the corresponding operator in $L_p$, for $1\leq p
Topological signature in the NEXT high pressure xenon TPC
Creators: name: Ferrario, Paola
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The NEXT experiment aims to observe the neutrinoless double beta decay of Xe-136 in a high-pressure xenon gas TPC using electroluminescence to amplify the signal from ionization. One of the main advantages of this technology is the possibility to use the topology of events with energies close to Qbb as an extra tool to reject background. In these proceedings we show with data from prototypes that an extra background rejection factor of 24.3 +- 1.4 (stat.)% can be achieved, while maintaining an efficiency of 66.7 +- 1.% for signal events. The performance expected in NEW, the next stage of the experiment, is to improve to 12.9% +- 0.6% background acceptance for 66.9% +- 0.6% signal efficiency.
description: Proceedings of the XXVII International Conference on Neutrino Physics and Astrophysics (Neutrino), London, July 2016
Lightweight Interactions for Reciprocal Cooperation in a Social Network Game
Creators: name: Takano, Masanori
name: Wada, Kazuya
name: Fukuda, Ichiro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: The construction of reciprocal relationships requires cooperative interactions during the initial meetings. However, cooperative behavior with strangers is risky because the strangers may be exploiters. In this study, we show that people increase the likelihood of cooperativeness of strangers by using lightweight non-risky interactions in risky situations based on the analysis of a social network game (SNG). They can construct reciprocal relationships in this manner. The interactions involve low-cost signaling because they are not generated at any cost to the senders and recipients. Theoretical studies show that low-cost signals are not guaranteed to be reliable because the low-cost signals from senders can lie at any time. However, people used low-cost signals to construct reciprocal relationships in an SNG, which suggests the existence of mechanisms for generating reliable, low-cost signals in human evolution.
description: 13 pages, 2 figures
Imaging the elusive H-poor gas in the high ADF planetary nebula NGC 6778
Creators: name: García-Rojas, Jorge
name: Corradi, Romano L. M.
name: Monteiro, Hektor
name: Jones, David
name: Rodríguez-Gil, Pablo
name: Cabrera-Lavers, Antonio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first direct image of the high-metallicity gas component in a planetary nebula (NGC 6778), taken with the OSIRIS Blue Tunable Filter centered on the O II 4649+50 angstroms optical recombination lines (ORLs) at the 10.4m Gran Telescopio Canarias. We show that the emission of these faint O II ORLs is concentrated in the central parts of the planetary nebula and is not spatially coincident either with emission coming from the bright [O III] 5007 angstroms collisionally excited line (CEL) or the bright H alpha recombination line. From monochromatic emission line maps taken with VIMOS at the 8.2m Very Large Telescope, we find that the spatial distribution of the emission from the auroral [O III] 4363 line resembles that of the O II ORLs but differs from nebular [O III] 5007 CEL distribution, implying a temperature gradient inside the planetary nebula. The centrally peaked distribution of the O II emission and the differences with the [O III] and H I emission profiles are consistent with the presence of an H-poor gas whose origin may be linked to the binarity of the central star. However, determination of the spatial distribution of the ORLs and CELs in other PNe, and a comparison of their dynamics is needed to further constrain the geometry and ejection mechanism of the metal-rich (H-poor) component and hence, understand the origin of the abundance discrepancy problem in PNe.
description: 5 pages, 4 figures. Accepted for publication in the Astrophysical Journal Letters
Temperature-Dependent Full Spectrum Optical Responses of Semiconductors from First Principles
Creators: name: Han, Zherui
name: Lee, Changkyun
name: Song, Jiawei
name: Wang, Haiyan
name: Bermel, Peter
name: Ruan, Xiulin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: From ultraviolet to mid-infrared region, light-matter interaction mechanisms in semiconductors progressively shift from electronic transitions to phononic resonances and are affected by temperature. Here, we present a parallel temperature-dependent treatment of both electrons and phonons entirely from first principles, enabling the prediction of full-spectrum optical responses. At elevated temperatures, $\textit{ab initio}$ molecular dynamics is employed to find thermal perturbations to electronic structures and construct effective force constants describing potential landscape. Four-phonon scattering and phonon renormalization are included in an integrated manner in this approach. As a prototype ceramic material, cerium dioxide (CeO$_2$) is considered in this work. Our first-principles calculated refractive index of CeO$_2$ agrees well with measured data from literature and our own temperature-dependent ellipsometer experiment.
Learning Ability and Complex Problem Solving
Creators: name: Herrmann, Wiebke
name: Beckmann, Jens F.
name: Kretzschmar, André
Publisher: name: Open Science Framework
Year: 2022

description: Has supplemental materials for Herrmann, W., Beckmann, J. F., & Kretzschmar, A. (2023). The role of learning in complex problem solving using MicroDYN. Intelligence, 100, 101773. https://doi.org/10.1016/j.intell.2023.101773
A simple laser locking system based on a field-programmable gate array
Creators: name: Jørgensen, Nils B.
name: Birkmose, Danny
name: Trelborg, Kristian
name: Wacker, Lars
name: Winter, Nils
name: Hilliard, Andrew J.
name: Bason, Mark G.
name: Arlt, Jan J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Frequency stabilization of laser light is crucial in both scientific and industrial applications. Technological developments now allow analog laser stabilization systems to be replaced with digital electronics such as field-programmable gate arrays, which have recently been utilized to develop such locking systems. We have developed a frequency stabilization system based on a field-programmable gate array, with emphasis on hardware simplicity, which offers a user-friendly alternative to commercial and previous home-built solutions. Frequency modulation, lock-in detection and a proportional-integral-derivative controller are programmed on the field-programmable gate array and only minimal additional components are required to frequency stabilize a laser. The locking system is administered from a host-computer which provides comprehensive, long-distance control through a versatile interface. Various measurements were performed to characterize the system. The linewidth of the locked laser was measured to be $0.7 \pm 0.1 \; \rm{MHz}$ with a settling time of $10 \; \rm{ms}$. The system can thus fully match laser systems currently in use for atom trapping and cooling applications.
description: 6 pages, 6 figures, accepted for publication in Review of Scientific Instruments
Diffuse Emission of Galactic High-Energy Neutrinos from a Global Fit of Cosmic Rays
Creators: name: Schwefer, Georg
name: Mertsch, Philipp
name: Wiebusch, Christopher
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In the standard picture of galactic cosmic rays, a diffuse flux of high-energy gamma-rays and neutrinos is produced from inelastic collisions of cosmic ray nuclei with the interstellar gas. The neutrino flux is a guaranteed signal for high-energy neutrino observatories such as IceCube, but has not been found yet. Experimental searches for this flux constitute an important test of the standard picture of galactic cosmic rays. Both the observation and non-observation would allow important implications for the physics of cosmic ray acceleration and transport. We present CRINGE, a new model of galactic diffuse high-energy gamma-rays and neutrinos, fitted to recent cosmic ray data from AMS-02, DAMPE, IceTop as well as KASCADE. We quantify the uncertainties for the predicted emission from the cosmic ray model, but also from the choice of source distribution, gas maps and cross-sections. We consider the possibility of a contribution from unresolved sources. Our model predictions exhibit significant deviations from older models. Our fiducial model is available at https://doi.org/10.5281/zenodo.7373010 .
description: 30 pages, 14 figures; references added
Aligning Active Particles Py Package
Creators: name: Kürsten, Rüdiger
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: The package performs molecular-dynamics-like agent-based simulations for models of aligning self-propelled particles in two dimensions such as e.g. the seminal Vicsek model or variants of it. In one class of the covered models, the microscopic dynamics is determined by certain time discrete interaction rules. Thus, it is no Hamiltonian dynamics and quantities such as energy are not defined. In the other class of considered models (that are generally believed to behave qualitatively the same) Brownian dynamics is considered. However, also there, the forces are not derived from a Hamiltonian. Furthermore, in most cases, the forces depend on the state of all particles and can not be decomposed into a sum of forces that only depend on the states of pairs of particles. Due to the above specified features of the microscopic dynamics of such models, they are not implemented in major molecular dynamics simulation frameworks to the best of the authors knowledge. Models that are covered by this package have been studied with agent-based simulations by dozens of papers. However, no simulation framework of such models seems to be openly available. The program is provided as a Python package. The simulation code is written in C. In the current version, parallelization is not implemented.
description: 23 pages, 7 figures