cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Note on Twisted Crossed Products and Spectral Triples
Creators: name: Antonini, P.
name: Guido, D.
name: Isola, T.
name: Rubin, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Operator Algebras (math.OA)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58B34, 46LXX, 47L65

description: Starting with a spectral triple on a unital $C^{*}$-algebra $A$ with an action of a discrete group $G$, if the action is uniformly bounded (in a Lipschitz sense) a spectral triple on the reduced crossed product $C^{*}$-algebra $A\rtimes_{r} G$ is constructed in [Hawkins, Skalski, White, Zacharias. Mathematica Scandinavica 2013]. The main instrument is the Kasparov external product. We note that this construction still works for twisted crossed products when the twisted action is uniformly bounded in the appropriate sense. Under suitable assumptions we discuss some basic properties of the resulting triples: summability and regularity. Noncommutative coverings with finite abelian structure group are among the most basic, still interesting, examples of twisted crossed products; we describe their main features.
description: 33 pages, various corrections and improvements
Christoph B. Rüger, Germania Inferior
Creators: name: Wild, John Peter
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: Christoph B. Rüger, Germania Inferior. Untersuchungen zur Territorial- und Verwaltungsgeschichte Niedergermaniens in der Prinzipatszeit. Beihefte der Bonner Jahrbücher, Band 30. Böhlau Verlag, Köln-Graz 1968. VIII und 128 S., 4 Abbildungen und 1 Beilage.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Inflaton freeze-out
Creators: name: Lebedev, Oleg
name: Nerdi, Thomas
name: Solomko, Timofey
name: Yoon, Jong-Hyun
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the possibility that, after inflation, the inflaton reaches thermal equilibrium with the Standard Model thermal bath and eventually freezes-out in the non-relativistic regime. When the inflaton decay is the sole source of (non-thermal) dark matter, its relic density is automatically suppressed. We delineate parameter space leading to the correct dark matter abundance. The model allows for a significant Higgs-inflaton coupling which may lead to invisible Higgs decay into inflaton pairs at the LHC.
description: 14 pages, 3 figures; v2: matches version published in PRD (extended discussions, fixed typos, updated references)
Finite wavelength surface-tension driven instabilities in soft solids, including instability in a cylindrical channel through an elastic solid
Creators: name: Xuan, Chen
name: Biggins, John
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We deploy linear stability analysis to find the threshold wavelength ($λ$) and surface tension ($γ$) of Rayleigh-Plateau type "peristaltic" instabilities in incompressible neo-Hookean solids in a range of cylindrical geometries with radius $R_0$. First we consider a solid cylinder, and recover the well-known, infinite wavelength instability for $γ\ge6 μR_0$, where $μ$ is the solid's shear modulus. Second, we consider a volume-conserving (e.g.\ fluid filled and sealed) cylindrical cavity through an infinite solid, and demonstrate infinite wavelength instability for $γ\ge 2 μR_0$. Third, we consider a solid cylinder embedded in a different infinite solid, and find a finite wavelength instability with $λ\propto R_0$, at surface tension $γ\propto μR_0$, where the constants depend on the two solids' modulus ratio. Finally, we consider an empty cylindrical channel (or filled with expellable fluid) through an infinite solid, and find an instability with finite wavelength, $λ\approx2 R_0$, for $γ\ge 2.543... μR_0$. Using finite-strain numerics, we show such a channel jumps at instability to a highly peristaltic state, likely precipitating it's blockage or failure. We argue that finite wavelengths are generic for elasto-capillary instabilities, with the simple cylinder's infinite wavelength being the exception rather than the rule.
"Everything I count, I count it for you". How usage statistics can measure research, beyond views and downloads
Creators: name: Pierrakos, Dimitris
Publisher: name: Zenodo
Year: 2023
Subjects: Usage Statistics, Metadata, Open Access, Publishing

description: Usage statistics are based on the processing of usage events, triggered by metadata views or full text downloads of digital objects (eg. articles, datasets, books, etc.) in content providers like repositories, e-journals and CRISs. In this talk, we will discuss OpenAIRE’s UsageCounts service, the usage statistics service developed by OpenAIRE. UsageCounts service collects usage events and publishes COUNTER CoP standardized usage statistics, like the number of metadata views and full-text downloads for research items. However, it goes beyond this typical deployment of usage statistics and provides more qualitative metrics and adds value on how the usage statistics are exploited by a variety of stakeholders. This is realized via two paths. The first path is the enhancement of usage statistics with information from OpenAIRE Research Graph to build indicators that could be used to discover, analyze and evaluate the impact of Open Science. For example, how open access routes, Green, Gold, Hybrid, etc. are used, or how FAIR principles are accommodated in user behavior. UsageCounts service, also allows usage statistics, combined with topics from Field-of-Science (FoS) and Sustainable Development Goals (SDGs) to reflect relevance of a particular research output, over the course of time and up to the present. The second path of adding value using the UsageCounts service, is the exploitation of a hybrid content-based and collaborative filtering approach, using research product topics and usage events. This approach allows the construction of user communities, i.e., group of users sharing common interests and preferences. Following these two paths, UsageCounts provide for researchers, authors, funders and policy makers, a better understanding of the usage patterns of research products and useful insights for research uptake. They can be more recent than bibliometric indicators and could show the usage, via user communities, of a published work by non-authors, for example students, academics, and non-academic users who do not publish but may read scholarly publications and providing an important indicator to analyze trends. Usage statistics enhanced information, can also be exploited by stakeholders like repository managers to drive bibliographic instruction, internal marketing, and the development of the provider’s datasource. Finally, user communities can be used to develop a recommendation service that offers similar research products to the members of the community, based not only on the similarity of the content, but also on the similarity of the usage behaviour.
Ultra-Strong Spin-Orbit Coupling and Topological Moiré Engineering in Twisted ZrS2 Bilayers
Creators: name: Claassen, Martin
name: Xian, Lede
name: Kennes, Dante M.
name: Rubio, Angel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We predict that twisted bilayers of 1T-ZrS$_2$ realize a novel and tunable platform to engineer two-dimensional topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS$_2$ heterostructures give rise to an emergent and twist-controlled moiré Kagomé lattice, combining geometric frustration and strong spin-orbit coupling to give rise to a moiré quantum spin Hall insulator with highly controllable and nearly-dispersionless bands. We devise a generic pseudo-spin theory for group-IV transition metal dichalcogenides that relies on the two-component character of the valence band maximum of the 1T structure at $Γ$, and study the emergence of a robust quantum anomalous Hall phase as well as possible fractional Chern insulating states from strong Coulomb repulsion at fractional fillings of the topological moiré Kagomé bands. Our results establish group-IV transition metal dichalcogenide bilayers as a novel moiré platform to realize strongly-correlated topological phases in a twist-tunable setting.
description: 9 pages, 4 figures
Ordering in rolled-up single-walled ferromagnetic nanomembranes
Creators: name: Janutka, Andrzej
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magnetization of soft-ferromagnetic nano- and microtubes of nanometer-thin walls (a single-widening rolled-up nanomembranes) is theoretically studied using analytical and numerical approaches including different stress-induced anisotropies. Within the analytical study, we consider magnetostatic effects qualitatively, with an effective anisotropy, while they are fully treated in the micromagnetic simulations (limited to the tubes of submicrometer diameters however). Basic types of the periodic ordering have been established and their presence in nanotubes of polycrystalline Permalloy and cobalt has been verified within the simulations. The domain structure is basically determined by a material-deposition-induced helical stress or a cooling-induced axial stress via the volume magnetostriction while it is influenced by the distribution of magnetic charges as well. Also, it is dependent on the initial state of the magnetization process.
First passage in discrete-time absorbing Markov chains under stochastic resetting
Creators: name: Chen, Hanshuang
name: Li, Guofeng
name: Huang, Feng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: First passage of stochastic processes under resetting has recently been an active research topic in the field of statistical physics. However, most of previous studies mainly focused on the systems with continuous time and space. In this paper, we study the effect of stochastic resetting on first passage properties of discrete-time absorbing Markov chains, described by a transition matrix $\brm{Q}$ between transient states and a transition matrix $\brm{R}$ from transient states to absorbing states. Using a renewal approach, we exactly derive the unconditional mean first passage time (MFPT) to either of absorbing states, the splitting probability the and conditional MFPT to each absorbing state. All the quantities can be expressed in terms of a deformed fundamental matrix $\brm{Z_γ}=\left[\brm{I}-(1-γ) \brm{Q} \right]^{-1}$ and $\brm{R}$, where $\brm{I}$ is the identity matrix, and $γ$ is the resetting probability at each time step. We further show a sufficient condition under which the unconditional MPFT can be optimized by stochastic resetting. Finally, we apply our results to two concrete examples: symmetric random walks on one-dimensional lattices with absorbing boundaries and voter model on complete graphs.
description: 11 double-column pages and 5 figures
Filamentary flow and magnetic geometry in evolving cluster-forming molecular cloud clumps
Creators: name: Klassen, Mikhail
name: Pudritz, Ralph E.
name: Kirk, Helen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an analysis of the relationship between the orientation of magnetic fields and filaments that form in 3D magnetohydrodynamic simulations of cluster-forming, turbulent molecular cloud clumps. We examine simulated cloud clumps with size scales of L ~ 2-4 pc and densities of n ~ 400-1000 cm^-3 with Alfven Mach numbers near unity. We simulated two cloud clumps of different masses, one in virial equilibrium, the other strongly gravitationally bound, but with the same initial turbulent velocity field and similar mass-to-flux ratio. We apply various techniques to analyze the filamentary and magnetic structure of the resulting cloud, including the DisPerSE filament-finding algorithm in 3D. The largest structure that forms is a 1-2 parsec-long filament, with smaller connecting sub-filaments. We find that our simulated clouds, wherein magnetic forces and turbulence are comparable, coherent orientation of the magnetic field depends on the virial parameter. Subvirial clumps undergo strong gravitational collapse and magnetic field lines are dragged with the accretion flow. We see evidence of filament-aligned flow and accretion flow onto the filament in the subvirial cloud. Magnetic fields oriented more parallel in the subvirial cloud and more perpendicular in the denser, marginally bound cloud. Radiative feedback from a 16 Msun star forming in a cluster in one of our simulations ultimately results in the destruction of the main filament, the formation of an HII region, and the sweeping up of magnetic fields within an expanding shell at the edges of the HII region.
description: 26 pages, 19 figures, accepted for publication in MNRAS
Numerical studies of the scattering of light from a two-dimensional randomly rough interface between two dielectric media
Creators: name: Hetland, Øyvind S.
name: Maradudin, Alexei A.
name: Nordam, Tor
name: Simonsen, Ingve
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The scattering of polarized light incident from one dielectric medium on its two-dimensional randomly rough interface with a second dielectric medium is studied. A reduced Rayleigh equation for the scattering amplitudes is derived for the case where p- or s-polarized light is incident on this interface, with no assumptions being made regarding the dielectric functions of the media. Rigorous, purely numerical, nonperturbative solutions of this equation are obtained. They are used to calculate the reflectivity and reflectance of the interface, the mean differential reflection coefficient, and the full angular distribution of the intensity of the scattered light. These results are obtained for both the case where the medium of incidence is the optically less dense medium, and in the case where it is the optically more dense medium. Optical analogues of the Yoneda peaks observed in the scattering of x-rays from metal surfaces are present in the results obtained in the latter case. Brewster scattering angles for diffuse scattering are investigated, reminiscent of the Brewster angle for flat-interface reflection, but strongly dependent on the angle of incidence. When the contribution from the transmitted field is added to that from the scattered field it is found that the results of these calculations satisfy unitarity with an error smaller than $10^{-4}$.
description: 25 pages, 14 figures
W. A. van Es, Wijster, a Native Village beyond the Imperial Frontier 150—425 A.D.
Creators: name: Schmid, Peter
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: W. A. van Es, Wijster, a Native Village beyond the Imperial Frontier 150—425 A.D. Palaeohistoria, herausgegeben von H. T. Waterbolk, Band 11. Verlag J. B. Wolters, Groningen 1965 (1967). Text- und Tafelband mit 595 S., 289 Abb., 24 Tafeln und 11 Plänen.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Quantum Gravitational Force Between Polarizable Objects
Creators: name: Ford, L. H.
name: Hertzberg, Mark P.
name: Karouby, J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Since general relativity is a consistent low energy effective field theory, it is possible to compute quantum corrections to classical forces. Here we compute a quantum correction to the gravitational potential between a pair of polarizable objects. We study two distant bodies and compute a quantum force from their induced quadrupole moments due to two graviton exchange. The effect is in close analogy to the Casimir-Polder and London-van der Waals forces between a pair of atoms from their induced dipole moments due to two photon exchange. The new effect is computed from the shift in vacuum energy of metric fluctuations due to the polarizability of the objects. We compute the potential energy at arbitrary distances compared to the wavelengths in the system, including the far and near regimes. In the far distance, or retarded, regime, the potential energy takes on a particularly simple form: $V(r)=-3987\,\hbar\,c\,G^2α_{1S}\,α_{2S}/(4\,π\,r^{11})$, where $α_{1S},\,α_{2S}$ are the static gravitational quadrupole polarizabilities of each object. We provide estimates of this effect.
description: 5 pages, 1 figure, in double column format. V2: Fixed Eq. (16); added Feynman diagram to figure; other minor changes. V3: Updated to resemble version published in PRL
Boundedly finite measures: Separation and convergence by an algebra of functions
Creators: name: Löhr, Wolfgang
name: Rippl, Thomas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We prove general results about separation and weak$^\#$-convergence of boundedly finite measures on separable metric spaces and Souslin spaces. More precisely, we consider an algebra of bounded real-valued, or more generally a $*$-algebra $\mathcal{F}$ of bounded complex-valued functions and give conditions for it to be separating or weak$^\#$-convergence determining for those boundedly finite measures that integrate all functions in $\mathcal{F}$. For separation, it is sufficient if $\mathcal{F}$ separates points, vanishes nowhere, and either consists of only countably many measurable functions, or of arbitrarily many continuous functions. For convergence determining, it is sufficient if $\mathcal{F}$ induces the topology of the underlying space, and every bounded set $A$ admits a function in $\mathcal{F}$ with values bounded away from zero on $A$.
description: 14 pages
Erzsébet Patek, Die Urnenfelderkultur in Transdanubien
Creators: name: Hänsel, Bernhard
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: Erzsébet Patek, Die Urnenfelderkultur in Transdanubien. Archaeologia Hungarica, Dissertationes Archaeologicae Musei Nationahs Hungarici a Consilio Archaeologorum Academiae Scientiarum Hungaricae Redactae, S. N. 44. Akademiai Kiadd, Budapest 1968. 173 S., 5 Abbildungen und 140 Tafeln.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
BIM based visualisation support integrated with VR interfaces
Creators: name: Politi, Elena
name: Papageorgopoulos, Nikos
name: Papageorgiou, Xanthi
Publisher: name: Zenodo
Year: 2022
Subjects: BIM
Visualization
VR

description: The current deliverable D3.4 “BIM based visualisation support integrated with VR interface” aims at documenting the technical activities that were undertaken towards the definition of the second and final iteration of the Building Information Model (BIM) that was developed in the context of the S&R project and will be useful tool for the first responders during a search and rescue operation. The BIM model comprises a RESTful web service that exposes specific interfaces with the aim of representing building data and a Building semantic model that facilitates the data manipulation towards the creation of the necessary correlations towards the representation of the Building semantic model. The present deliverable will document the core components and the specific requirements of the web service, as well as the completed semantic model for the building data. In this frame, a RESTful web service is implemented to facilitate the building data manipulation towards the creation of the necessary correlations which constitute the semantic model. These correlations will be defined in order for the first responders to have a clear overview of the building during a S&R operation. Finally, the main functional components of the BIM management system are introduced, as well as the process of the BIM model data visualization through the VR technology devices of S&R that allows the first responder to obtain a well-defined conceptual model of the buildings, geometric properties and structural elements in the field.
Evaluation of Agribusiness Incubator: The Case of Central Mindanao University Agri-Aqua Technology Business Incubator (CMU-ATBI)
Creators: name: Seybold Report Journal
Publisher: name: Seybold Report Journal
Year: 2024

description: Abstract

Business incubation is widely acknowledged as a crucial mechanism for economic development and job creation. The Central Mindanao University-Agri-Aqua Technology Business Incubator (CMU-ATBI) project was established to commercialize technologies developed through research at the university. An evaluation study is initiated to determine the impacts of the CMU-ATBI to its beneficiaries known as incubatees. The Organization for Economic Co-operation and Development's (OECD) Development Assistance Committee (DAC) evaluation framework was used in the evaluation. There were 10 CMU-ATBI beneficiaries interviewed for the study who were located in the different municipalities in Bukidnon. The score of the different criteria used suggest that the business support services offered by CMU-ATBI are relevant, effective, efficient, impactful, and sustainable. It highly contributes to over-all development of the respondent’s enterprise and this in one way or another contribute to community development.

Keywords: Incubation, relevance, efficiency, effectivity, sustainability.
Neolithic Studies in Atlantic Europe
Creators: name: Lüning, Jens
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: Neolithic Studies in Atlantic Europe. Proceedings of the Second Atlantic Colloquium Groningen, 6-11 April 1964. Presented to A. E. van Giffen for his 80th Birthday. Edited by J. D. van der Waals. Palaeohistoria, Bd. 12. Verlag J. B. Wolters, Groningen 1966 (1967). XV und 585 S., 1 Frontispiz, 188 Abb., 5 Tabellen und 2 Tafeln.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Konsultation zur Frage der sachgemäßen Schriftauslegung
Creators: name: Gosejacob-Rolf, Hille
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1822545153
description: Jahrbuch für evangelikale Theologie, V. 4 (1990): Jahrbuch für evangelikale Theologie, Band 4
A Vlasov-Poisson plasma with unbounded mass and velocities confined in a cylinder by a magnetic mirror
Creators: name: Caprino, Silvia
name: Cavallaro, Guido
name: Marchioro, Carlo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study the time evolution of a single species positive plasma, confined in a cylinder and having infinite charge. We extend the result of a previous work by the same authors, for a plasma density having compact support in the velocities, to the case of a density having unbounded support and gaussian decay in the velocities.
description: accepted on "Kinetic and Related Models"
Wolfgang Kimmig, Der Kirchberg bei Reusten
Creators: name: Lüning, Jens
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: Wolfgang Kimmig, Der Kirchberg bei Reusten. Eine Höhensiedlung aus vorgeschichtlicher Zeit. Mit einem Beitrag von Gerhard Wein. Urkunden zur Vor-und Frühgeschichte aus Südwürttemberg-Hohenzollern. Herausgegeben vom Staatlichen Amt fur Denkmalpflege Tübingen, Heft 2. Verlag Silberburg Kommissionsverlag, Stuttgart 1966. 97 S., 1 Abb., 74 Tafeln und 2 Beilagen.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Hermann Müller-Karpe, Handbuch der Vorgeschichte
Creators: name: Mandera, Heinz-Eberhard
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: Hermann Müller-Karpe, Handbuch der Vorgeschichte. Band 2. Jungsteinzeit. C. H. Beck’sche Verlagsbuchhandlung, München 1968. Textband mit XIII und 612 Seiten und 8 Abbildungen. Tafelband mit 6 Tabellen und 327 Tafeln.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Quadraxial metamaterial
Creators: name: Sakhno, Denis
name: Koreshin, Eugene
name: Belov, Pavel A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study the dispersion of electromagnetic waves in a spatially dispersive metamaterial with Lorentz-like dependence of principal permittivity tensor components on the respective components of the wave vector performing the analysis of isofrequency contours. The considered permittivity tensor describes triple non-connected wire medium. It is demonstrated that the metamaterial has four optic axes in the frequency range below artificial plasma frequency. The directions of the optical axes do not depend on frequency and coincide with the diagonals of quadrants. The metamaterial supports two propagating electromagnetic waves in all directions of space except the directions of axes. The conical refraction effect is observed for all four optic axes both below and above artificial plasma frequency where the metamaterial supports five propagating waves in most of the directions.
Solving the sampling problem of the Sycamore quantum circuits
Creators: name: Pan, Feng
name: Chen, Keyang
name: Zhang, Pan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We study the problem of generating independent samples from the output distribution of Google's Sycamore quantum circuits with a target fidelity, which is believed to be beyond the reach of classical supercomputers and has been used to demonstrate quantum supremacy. We propose a new method to classically solve this problem by contracting the corresponding tensor network just once, and is massively more efficient than existing methods in obtaining a large number of uncorrelated samples with a target fidelity. For the Sycamore quantum supremacy circuit with $53$ qubits and $20$ cycles, we have generated one million uncorrelated bitstrings $\{\mathbf s\}$ which are sampled from a distribution $\hat P(\mathbf s)=|\hat ψ(\mathbf s)|^2$, where the approximate state $\hat ψ$ has fidelity $F\approx 0.0037$. The whole computation has cost about $15$ hours on a computational cluster with $512$ GPUs. The obtained one million samples, the contraction code and contraction order is made public. If our algorithm could be implemented with high efficiency on a modern supercomputer with ExaFLOPS performance, we estimate that ideally, the simulation would cost a few dozens of seconds, which is faster than Google's quantum hardware.
description: 17 pages, 13 figures
Complete Normal Ordering 1: Foundations
Creators: name: Ellis, John
name: Mavromatos, Nick E.
name: Skliros, Dimitri P.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We introduce a new prescription for quantising scalar field theories perturbatively around a true minimum of the full quantum effective action, which is to `complete normal order' the bare action of interest. When the true vacuum of the theory is located at zero field value, the key property of this prescription is the automatic cancellation, to any finite order in perturbation theory, of all tadpole and, more generally, all `cephalopod' Feynman diagrams. The latter are connected diagrams that can be disconnected into two pieces by cutting one internal vertex, with either one or both pieces free from external lines. In addition, this procedure of `complete normal ordering' (which is an extension of the standard field theory definition of normal ordering) reduces by a substantial factor the number of Feynman diagrams to be calculated at any given loop order. We illustrate explicitly the complete normal ordering procedure and the cancellation of cephalopod diagrams in scalar field theories with non-derivative interactions, and by using a point splitting `trick' we extend this result to theories with derivative interactions, such as those appearing as non-linear sigma-models in the world-sheet formulation of string theory. We focus here on theories with trivial vacua, generalising the discussion to non-trivial vacua in a follow-up paper.
description: 40 pages; a significantly condensed version compared to v1; matches published article. Refer to v1 for a pedagogical exposition
Frühe Menschheit und Umwelt, Teil II
Creators: name: Mandera, Heinz-Eberhard
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: Frühe Menschheit und Umwelt, Teil II. Naturwissenschaftliche Beitrage. Herausgegeben von Karl Gripp, Rudolf Schutrumpf und Hermann Schwabedissen. Fundamenta, Monographien zur Urgeschichte, Reihe B, Band 2. Bohlau Verlag, Köln-Graz 1967. VIII und 329 S., 28 Abb., 42 Tabellen und 61 Tafeln.
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Diffeomorphism invariant cosmological symmetry in full quantum gravity
Creators: name: Beetle, Christopher
name: Engle, Jonathan S.
name: Hogan, Matthew E.
name: Mendonca, Phillip
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper summarizes a new proposal to define rigorously a sector of loop quantum gravity at the diffeomorphism invariant level corresponding to homogeneous and isotropic cosmologies, thereby enabling a detailed comparison of results in loop quantum gravity and loop quantum cosmology. The key technical steps we have completed are (a) to formulate conditions for homogeneity and isotropy in a diffeomorphism covariant way on the classical phase space of general relativity, and (b) to translate these conditions consistently using well-understood techniques to loop quantum gravity. Some additional steps, such as constructing a specific embedding of the Hilbert space of loop quantum cosmology into a space of (distributional) states in the full theory, remain incomplete. However, we also describe, as a proof of concept, a complete analysis of an analogous embedding of homogeneous and isotropic loop quantum cosmology into the quantum Bianchi I model of Ashtekar and Wilson-Ewing. Details will appear in a pair of forthcoming papers.
description: 8 pages, invited submission for special issue of Int. J. Mod. Phys. D; Remark added on use of intertwining condition to reduce quantization ambiguities, assumptions on matter model made clear, sign convention for complexification changed to match that of Thiemann, as well as minor corrections
Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS
Creators: name: Liu, Yangyang
name: Dhakal, Gyanendra
name: Sakhya, Anup Pradhan
name: Beetar, John E.
name: Kabir, Firoza
name: Regmi, Sabin
name: Kaczorowski, Dariusz
name: Chini, Michael
name: Fregoso, Benjamin M.
name: Neupane, Madhab
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Despite being the most studied nodal line semimetal, a clear understanding of the transient state relaxation dynamics and the underlying mechanism in ZrSiS is lacking. Using time and angle resolved photoemission spectroscopy, we study the ultrafast relaxation dynamics in ZrSiS and reveal a unique relaxation in the bulk nodal-line state which is well captured by a simple model based on optical and acoustic phonon cooling. We find linear decay processes for both optical and acoustic phonon relaxations with acoustic cooling suppressed at high temperatures. Our results reveal different decay mechanisms for the bulk and surface states and pave a way to understand the mechanism of conduction in this material.
description: 7 pages, 4 figures
The Hausdorff and dynamical dimensions of self-affine sponges: a dimension gap result
Creators: name: Das, Tushar
name: Simmons, David
Publisher: name: arXiv
Year: 2016
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We construct a self-affine sponge in $\mathbb R^3$ whose dynamical dimension, i.e. the supremum of the Hausdorff dimensions of its invariant measures, is strictly less than its Hausdorff dimension. This resolves a long-standing open problem in the dimension theory of dynamical systems, namely whether every expanding repeller has an ergodic invariant measure of full Hausdorff dimension. More generally we compute the Hausdorff and dynamical dimensions of a large class of self-affine sponges, a problem that previous techniques could only solve in two dimensions. The Hausdorff and dynamical dimensions depend continuously on the iterated function system defining the sponge, implying that sponges with a dimension gap represent a nonempty open subset of the parameter space.
Commercial Advertising of Alcohol: Using Law to Challenge Public Health Regulation
Creators: name: O'Brien, P
name: Room, Robin
name: Anderson-Luxford, Daniel
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 4804
subject: Law in context
classificationCode: 5001
subject: Applied ethics

description: In most countries, the alcohol industry enjoys considerable freedom to market its products. Where government regulation is proposed or enacted, the alcohol industry has often deployed legal arguments and used legal forums to challenge regulation. Governments considering marketing regulation must be cognizant of relevant legal constraints and be prepared to defend their policies against industry legal challenges.
Ovales Bronzetablett mit Besitzerinschrift von Haßleben, Kr. Erfurt. Eine Neubetrachtung
Creators: name: Müller, Detlef W.
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Möglichkeiten der ¹⁴C-Datierung
Creators: name: Willkomm, Horst
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
Stellung der männlichen Statuette aus dem Hohlenstein-Stadel in der jungpaläolithischen Kunst
Creators: name: Hahn, Joachim
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 48 (1970)
A general realistic treatment of the disk paradox
Creators: name: Pantazis, George
name: Perivolaropoulos, Leandros
Publisher: name: arXiv
Year: 2016
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Mechanical angular momentum is not conserved in systems involving electromagnetic fields with non-zero electromagnetic field angular momentum. Conservation is restored only if the total (mechanical and field) angular momentum is considered. Previous studies have investigated this effect, known as "Feynman's Electromagnetic Paradox" or simply "Disk Paradox" in the context of idealized systems (infinite or infinitesimal solenoids and charged cylinders etc). In the present analysis we generalize previous studies by considering more realistic systems with finite components and demonstrating explicitly the conservation of the total angular momentum. This is achieved by expressing both the mechanical and the field angular momentum in terms of charges and magnetic field fluxes through various system components. Using this general expression and the closure of magnetic field lines, we demonstrate explicitly the conservation of total angular momentum in both idealized and realistic systems (finite solenoid concentric with two charged cylinders, much longer than the solenoid) taking all the relevant terms into account including the flux outside of the solenoid. This formalism has the potential to facilitate a simpler and more accurate demonstration of total angular momentum conservation in undergraduate physics electromagnetism laboratories.
description: 13 pages, 6 figures, see Supplemental Material at https://www.dropbox.com/s/267vu6xc6s5rdfh/fdp.zip?dl=0 for the Mathematica file used for the production of the figures. Modifications compared to previous version (typos and improved presentation). Accepted in European Journal of Physics
Emergence of Hilbert Space Fragmentation in Ising Models with a Weak Transverse Field
Creators: name: Yoshinaga, Atsuki
name: Hakoshima, Hideaki
name: Imoto, Takashi
name: Matsuzaki, Yuichiro
name: Hamazaki, Ryusuke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The transverse-field Ising model is one of the fundamental models in quantum many-body systems, yet a full understanding of its dynamics remains elusive in higher than one dimension. Here, we show for the first time the breakdown of ergodicity in $d$-dimensional Ising models with a weak transverse field in a prethermal regime. We demonstrate that novel Hilbert-space fragmentation occurs in the effective non-integrable model with $d\geq2$ as a consequence of only one emergent global conservation law of the domain wall number. Our results indicate nontrivial initial-state dependence for non-equilibrium dynamics of the Ising models in a weak transverse field.
description: 8 pages, 3 figures (main), 5 pages, 6 figures (supplement). v3: final version
Signatures of Primordial Gravitational Waves on the Large-Scale Structure of the Universe
Creators: name: Bari, Pritha
name: Ricciardone, Angelo
name: Bartolo, Nicola
name: Bertacca, Daniele
name: Matarrese, Sabino
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the generation and evolution of second-order energy-density perturbations arising from primordial gravitational waves. Such "tensor-induced scalar modes" approximately evolve as standard linear matter perturbations and may leave observable signatures in the Large-Scale Structure of the Universe. We study the imprint on the matter power-spectrum of some primordial models which predict a large gravitational-wave signal at high frequencies. This novel mechanism in principle allows us to constrain or detect primordial gravitational waves by looking at specific features in the matter or galaxy power-spectrum, thereby allowing to probe them on a range of scales unexplored so far.
description: v2. 8 pages, 2 figures. Figure 1 changed. Typos corrected. References added. Minor change of text. Conclusion unchanged. Published in Physical Review Letters
Die ökologische Krise und die christliche Lehre von der Schöpfung
Creators: name: Beck, Horst W.
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1822544599
description: Jahrbuch für evangelikale Theologie, V. 4 (1990): Jahrbuch für evangelikale Theologie, Band 4
Quantum teleportation via a two-qubit Heisenberg XXX chain with x-component of Dzyaloshinskii-Moriya interaction
Creators: name: Houça, Rachid
name: Belouad, Abdelhadi
name: Choubabi, El Bouâzzaoui
name: Kamal, Abdellatif
name: Bouziani, Mohammed El
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we investigate the thermal entanglement and teleportation of a thermally mixed entangled via a two-qubit Heisenberg XXX chain with the x-component $D_x$ of the Dzyaloshinskii-Moriya interaction. Our findings suggest that temperature $T$, spin coupling constant J, and the x-components $D_x$ may influence entanglement of the output states and, consequently, the possibilities of teleportation protocols. Furthermore, these results indicate that the entanglement of the output states requires a low-temperature regime, weak Dzyaloshinskii-Moriya interaction, or an antiferromagnetic chain. Finally, the channel becomes entangled, making the teleportation protocol conceivable and feasible.
description: 13 pages, 4 figures
The Moutard transformation for the Davey-Stewartson II equation and its geometrical meaning
Creators: name: Taimanov, Iskander A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The Moutard transform is constructed for the solutions of the Davey-Stewartson II equation. It is geometrically interpreted using the spinor (Weierstrass) representation of surfaces in four-dimensional Euclidean space. Using the Moutard transformation and minimal surfaces, examples of solutions are constructed that have smooth, rapidly decreasing initial data and lose their regularity in a finite time.
description: 18 pages
Trimmed Harrell-Davis quantile estimator based on the highest density interval of the given width
Creators: name: Akinshin, Andrey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 62G05, 62G35, 62G30

description: Traditional quantile estimators that are based on one or two order statistics are a common way to estimate distribution quantiles based on the given samples. These estimators are robust, but their statistical efficiency is not always good enough. A more efficient alternative is the Harrell-Davis quantile estimator which uses a weighted sum of all order statistics. Whereas this approach provides more accurate estimations for the light-tailed distributions, it's not robust. To be able to customize the trade-off between statistical efficiency and robustness, we could consider a trimmed modification of the Harrell-Davis quantile estimator. In this approach, we discard order statistics with low weights according to the highest density interval of the beta distribution.
description: 11 pages, 6 figures, the paper source code is available at https://github.com/AndreyAkinshin/paper-thdqe
Conflict and Computation on Wikipedia: a Finite-State Machine Analysis of Editor Interactions
Creators: name: DeDeo, Simon
Publisher: name: arXiv
Year: 2015
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: What is the boundary between a vigorous argument and a breakdown of relations? What drives a group of individuals across it? Taking Wikipedia as a test case, we use a hidden Markov model to approximate the computational structure and social grammar of more than a decade of cooperation and conflict among its editors. Across a wide range of pages, we discover a bursty war/peace structure where the systems can become trapped, sometimes for months, in a computational subspace associated with significantly higher levels of conflict-tracking "revert" actions. Distinct patterns of behavior characterize the lower-conflict subspace, including tit-for-tat reversion. While a fraction of the transitions between these subspaces are associated with top-down actions taken by administrators, the effects are weak. Surprisingly, we find no statistical signal that transitions are associated with the appearance of particularly anti-social users, and only weak association with significant news events outside the system. These findings are consistent with transitions being driven by decentralized processes with no clear locus of control. Models of belief revision in the presence of a common resource for information-sharing predict the existence of two distinct phases: a disordered high-conflict phase, and a frozen phase with spontaneously-broken symmetry. The bistability we observe empirically may be a consequence of editor turn-over, which drives the system to a critical point between them.
description: 23 pages, 3 figures. Matches published version. Code for HMM fitting available at http://bit.ly/sfihmm ; time series and derived finite state machines at bit.ly/wiki_hmm
Hard-disk dipoles and non-reversible Markov chains
Creators: name: Hoellmer, Philipp
name: Maggs, A. C.
name: Krauth, Werner
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We benchmark event-chain Monte Carlo (ECMC) algorithms for tethered hard-disk dipoles in two dimensions in view of application of ECMC to water models in molecular simulation. We characterize the rotation dynamics of dipoles through the integrated autocorrelation times of the polarization. The non-reversible straight, reflective, forward, and Newtonian ECMC algorithms are all event-driven, and they differ only in their update rules at event times. They realize considerable speedups with respect to the local reversible Metropolis algorithm. We also find significant speed differences among the ECMC variants. Newtonian ECMC appears particularly well-suited for overcoming the dynamical arrest that has plagued straight ECMC for three-dimensional dipolar models with Coulomb interactions.
description: 9 pages, 7 figures