cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Do Names Echo Semantics? A Large-Scale Study of Identifiers Used in C++'s Named Casts
Creators: name: Petrescu, Constantin Cezar
name: Smith, Sam
name: Giavrimis, Rafail
name: Dash, Santanu Kumar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: Information Theory (cs.IT)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Developers relax restrictions on a type to reuse methods with other types. While type casts are prevalent, in weakly typed languages such as C++, they are also extremely permissive. Assignments where a source expression is cast into a new type and assigned to a target variable of the new type, can lead to software bugs if performed without care. In this paper, we propose an information-theoretic approach to identify poor implementations of explicit cast operations. Our approach measures accord between the source expression and the target variable using conditional entropy. We collect casts from 34 components of the Chromium project, which collectively account for 27MLOC and random-uniformly sample this dataset to create a manually labelled dataset of 271 casts. Information-theoretic vetting of these 271 casts achieves a peak precision of 81% and a recall of 90%. We additionally present the findings of an in-depth investigation of notable explicit casts, two of which were fixed in recent releases of the Chromium project.
description: The manuscript has 27 pages and it contains 4 Figures, 18 Listings and 4 Tables. The preprint has been accepted at Journal of Systems and Software from Elsevier
Dissipation-Assisted Quantum Information Processing with Trapped Ions
Creators: name: Bermudez, A.
name: Schaetz, T.
name: Plenio, M. B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a scheme to perform dissipation-assisted quantum information processing in ion traps considering realistic decoherence rates, for example, due to motional heating. By means of continuous sympathetic cooling, we overcome the trap heating, and show that the damped vibrational excitations can still be exploited to mediate coherent interactions as well as collective dissipative effects. We describe how to control their relative strength experimentally, allowing for protocols of coherent or dissipative generation of entanglement. This scheme can be scaled to larger ion registers for coherent or dissipative many-body quantum simulations.
description: closer to the published version
Moments and Lyapunov exponents for the parabolic Anderson model
Creators: name: Borodin, Alexei
name: Corwin, Ivan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study the parabolic Anderson model in $(1+1)$ dimensions with nearest neighbor jumps and space-time white noise (discrete space/continuous time). We prove a contour integral formula for the second moment and compute the second moment Lyapunov exponent. For the model with only jumps to the right, we prove a contour integral formula for all moments and compute moment Lyapunov exponents of all orders.
description: Published in at http://dx.doi.org/10.1214/13-AAP944 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Off-Policy Actor-Critic with Emphatic Weightings
Creators: name: Graves, Eric
name: Imani, Ehsan
name: Kumaraswamy, Raksha
name: White, Martha
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: A variety of theoretically-sound policy gradient algorithms exist for the on-policy setting due to the policy gradient theorem, which provides a simplified form for the gradient. The off-policy setting, however, has been less clear due to the existence of multiple objectives and the lack of an explicit off-policy policy gradient theorem. In this work, we unify these objectives into one off-policy objective, and provide a policy gradient theorem for this unified objective. The derivation involves emphatic weightings and interest functions. We show multiple strategies to approximate the gradients, in an algorithm called Actor Critic with Emphatic weightings (ACE). We prove in a counterexample that previous (semi-gradient) off-policy actor-critic methods--particularly Off-Policy Actor-Critic (OffPAC) and Deterministic Policy Gradient (DPG)--converge to the wrong solution whereas ACE finds the optimal solution. We also highlight why these semi-gradient approaches can still perform well in practice, suggesting strategies for variance reduction in ACE. We empirically study several variants of ACE on two classic control environments and an image-based environment designed to illustrate the tradeoffs made by each gradient approximation. We find that by approximating the emphatic weightings directly, ACE performs as well as or better than OffPAC in all settings tested.
description: 63 pages
Environments of galaxies in groups within the supercluster-void network
Creators: name: Lietzen, Heidi
name: Tempel, Elmo
name: Heinämäki, Pekka
name: Nurmi, Pasi
name: Einasto, Maret
name: Saar, Enn
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Majority of all galaxies reside in groups of less than 50 member galaxies. These groups are distributed in various large-scale environments from voids to superclusters. Evolution of galaxies is affected by the environment in which they reside. Our aim is to study the effects that the local group scale and the supercluster scale environment have on galaxies. We use a luminosity-density field to determine density of the large-scale environment of galaxies in groups of various richness. We calculate fractions of different types of galaxies in groups with richnesses up to 50 member galaxies and in different large-scale environments from voids to superclusters. The fraction of passive elliptical galaxies rises and the fraction of star-forming spiral galaxies declines when the richness of a group of galaxies rises from two to approximately ten galaxies. On the large scale, the passive elliptical galaxies become more numerous than star-forming spirals when the environmental density grows to the density level typical for superclusters. The large-scale environment affects the level of these fractions in groups: galaxies in equally rich groups are more likely to be elliptical in supercluster environments than in lower densities. The crossing point, where the number of passive and star-forming galaxies is equal, happens in groups with lower richness in superclusters than in voids. Galaxies in low-density areas require richer groups to evolve from star-forming to passive. Groups in superclusters are on average more luminous than groups in large-scale environments with lower density. Our results suggest that the evolution of galaxies is affected by both, by the group in which the galaxy resides, and by its large-scale environment. Galaxies in lower-density regions develop later than galaxies in similar mass groups in high-density environments.
description: 10 pages, 9 figures. Published in A&A. Language corrected 9th Oct 2012
Confined Klein-Gordon oscillators in Minkowski spacetime and a pseudo-Minkowski spacetime with a space-like dislocation: PDM KG-oscillators, isospectrality and invariance
Creators: name: Mustafa, Omar
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We revisit the a confined (in a Cornell-type Lorentz scalar potential) KG-oscillator in Minkowski spacetime with space-like dislocation background. We show that the effect of space-like dislocation is to shift the energy levels along the dislocation parameter axis, and consequently energy levels crossings are unavoidable. We report some KG-particles in a pseudo-Minkowski spacetime with space-like dislocation that admit isospectrality and invariance with the confined KG-oscillator in Minkowski spacetime with space-like dislocation. An alternative PDM setting for the KG-particles (relativistic particles in general) is introduced. We discuss the effects of space-like dislocation and PDM settings on the confined KG-oscillators in Minkowski spacetime with space-like dislocation. Three confined PDM KG-oscillators are discussed as illustrative examples, (i) a PDM KG-oscillator from a dimensionless scalar multiplier $g\left( r\right) =\, exp(2αr^2)\geq0,\, α\,\geq 0$, (ii) a PDM KG-oscillator from a power law type dimensionless scalar multiplier $g\left( r\right) =Ar^{σ}\geq0$, and (iii) a PDM KG-oscillator in a Cornnell-type confinement with a dimensionless scalar multiplier $g\left( r\right) =\exp \left( ξr\right)\geq0$
description: 17 pages, 3 Figures
Ingemar König. Die gallischen Usurpatoren von Postumus bis Tetricus
Creators: name: Ziegler, Ruprecht
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Ingemar König. Die gallischen Usurpatoren von Postumus bis Tetricus. Vestigia, Beiträge zur Alten Geschichte 31. Verlag C. H. Beck, München 1981. XIII, 237 Seiten
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Loss compensation by spasers in metamaterials
Creators: name: Andrianov, E. S.
name: Baranov, D. G.
name: Pukhov, A. A.
name: Dorofeenko, A. V.
name: Vinogradov, A. P.
name: Lisyansky, A. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We show that exact loss compensation can be achieved in active metamaterials containing spasers pumped over a wide range of pumping values both below and above the spasing threshold. We demonstrate that the difference between spaser operation below and above spasing threshold vanishes, when the spaser is synchronized by an external field. As the spasing threshold loses its significance, a new pumping threshold, the threshold of loss compensation, arises. Below this threshold, which is smaller than the spasing threshold, compensation is impossible at any frequency of the external field.
Martin Frey, Die römischen Terra-Sigillata-Stempel aus Trier
Creators: name: Hoffmann, Bettina
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Martin Frey, Die römischen Terra-Sigillata-Stempel aus Trier. Trierer Zeitschrift für Geschichte und Kunst des Trierer Landes und seiner Nachbargebiete, Beiheft 15. Rheinisches Landesmuseum Trier, Trier 1993. 113 Seiten, 17 Tafeln
description: Bonner Jahrbücher, Bd. 196.1996(1997): Bonner Jahrbücher
DFT+U+J with linear response parameters predicts non-magnetic oxide band gaps with hybrid-functional accuracy
Creators: name: Lambert, Daniel S.
name: O'Regan, David D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: First-principles Hubbard-corrected approximate density-functional theory (DFT+U) is a low-cost, potentially high throughput method of simulating materials, but it has been hampered by empiricism and inconsistent band-gap correction in transition-metal oxides. DFT+U property prediction of non-magnetic systems such as d0 and d10 transition-metal oxides is typically faced with excessively large calculated Hubbard U values, and with difficulty in obtaining acceptable band-gaps and lattice volumes. Meanwhile, Hund's exchange coupling J is an important but often neglected component of DFT+U, and the J parameter has proven challenging to directly calculate by means of linear response. In this work, we provide a revised formula for computing Hund's J using established self-consistent field DFT+U codes. For non-magnetic systems, we introduce a non-approximate technique for calculating U and J simultaneously in such codes, at no additional cost. Using unmodified Quantum ESPRESSO, we assess the resulting values using two different DFT+U functionals incorporating J, namely the widely used DFT+(U-J) and the readily available DFT+U+J. We assess a test set comprising TiO2, ZrO2, HfO2, Cu2O and ZnO, and apply the corrections both to metal and oxygen centered pseudoatomic subspaces. Starting from the PBE functional, we find that DFT+(U-J) is significantly out-performed in band-gap accuracy by DFT+U+J, the RMS band-gap error of which matches that of the hybrid functional HSE06. ZnO, a long-standing challenge case for DFT+U, is addressed by means of Zn 4s instead of Zn 3d correction, in which case the first-principles DFT+U+J band-gap error is half of that reported for HSE06.
description: 32 pages 7 figures, 10 tables
Applying geometric K-cycles to fractional indices
Creators: name: Deeley, Robin J.
name: Goffeng, Magnus
Publisher: name: arXiv
Year: 2012
Subjects: subject: K-Theory and Homology (math.KT)
subject: Differential Geometry (math.DG)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics

description: A geometric model for twisted $K$-homology is introduced. It is modeled after the Mathai-Melrose-Singer fractional analytic index theorem in the same way as the Baum-Douglas model of $K$-homology was modeled after the Atiyah-Singer index theorem. A natural transformation from twisted geometric $K$-homology to the new geometric model is constructed. The analytic assembly mapping to analytic twisted $K$-homology in this model is an isomorphism for torsion twists on a finite CW-complex. For a general twist on a smooth manifold the analytic assembly mapping is a surjection. Beyond the aforementioned fractional invariants, we study $T$-duality for geometric cycles.
description: 29 pages
Bounce and cyclic cosmology in extended nonlinear massive gravity
Creators: name: Cai, Yi-Fu
name: Gao, Caixia
name: Saridakis, Emmanuel N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate non-singular bounce and cyclic cosmological evolutions in a universe governed by the extended nonlinear massive gravity, in which the graviton mass is promoted to a scalar-field potential. The extra freedom of the theory can lead to certain energy conditions violations and drive cyclicity with two different mechanisms: either with a suitably chosen scalar-field potential under a given Stuckelberg-scalar function, or with a suitably chosen Stuckelberg-scalar function under a given scalar-field potential. Our analysis shows that extended nonlinear massive gravity can alter significantly the evolution of the universe at both early and late times.
description: 20 pages, 5 figures, version published at JCAP
New Computational Upper Bounds for Ramsey Numbers R(3,k)
Creators: name: Goedgebeur, Jan
name: Radziszowski, Stanisław P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C55, 05C30, 68R10

description: Using computational techniques we derive six new upper bounds on the classical two-color Ramsey numbers: R(3,10) <= 42, R(3,11) <= 50, R(3,13) <= 68, R(3,14) <= 77, R(3,15) <= 87, and R(3,16) <= 98. All of them are improvements by one over the previously best known bounds. Let e(3,k,n) denote the minimum number of edges in any triangle-free graph on n vertices without independent sets of order k. The new upper bounds on R(3,k) are obtained by completing the computation of the exact values of e(3,k,n) for all n with k <= 9 and for all n <= 33 for k = 10, and by establishing new lower bounds on e(3,k,n) for most of the open cases for 10 <= k <= 15. The enumeration of all graphs witnessing the values of e(3,k,n) is completed for all cases with k <= 9. We prove that the known critical graph for R(3,9) on 35 vertices is unique up to isomorphism. For the case of R(3,10), first we establish that R(3,10) = 43 if and only if e(3,10,42) = 189, or equivalently, that if R(3,10) = 43 then every critical graph is regular of degree 9. Then, using computations, we disprove the existence of the latter, and thus show that R(3,10) <= 42.
description: 28 pages (includes a lot of tables); added improved lower bound for R(3,11); added some notes
GO-SHIP Repeat Hydrography Nutrient Manual: The Precise and Accurate Determination of Dissolved Inorganic Nutrients in Seawater, Using Continuous Flow Analysis Methods. [GOOS ENDORSED PRACTICE]
Creators: name: Becker, Susan
name: Aoyama, Michio
name: Woodward, E. Malcolm S
name: Bakker, Karel
name: Coverly, Stephen
name: Mahaffey, Claire
name: Tanhua, Toste
Publisher: name: UNESCO/IOC
Year: 2020
Subjects: subject: Best practices
subject: GO-SHIP
subject: Methodology
subject: Reference materials
subject: Hydrography and tracers
subject: Continuous flow analysis methods
subject: GOOS Endorsed Practice
subject: Nitrite
subject: Nitrate
subject: Silicate
subject: Ammonium
subject: Parameter Discipline::Chemical oceanography::Nutrients
subject: Instrument Type Vocabulary::nutrient analysers
subject: Instrument Type Vocabulary::continuous water samplers
subject: Data Management Practices::Data quality control

description: The GO-SHIP nutrient manual covers all aspects of nutrient analysis from basic samplecollection and storage, specifically for Continuous Flow analysis using an Auto-Analyzer,and describes some specific nutrient methods for Nitrate, Nitrite, Silicate, Phosphateand Ammonium that are in use by many laboratories carrying out at-sea analysisand repeat hydrography sections across the world. The focus is on segmented flowanalyzers not flow injection analyzers. It also covers laboratory best practices includingquality control and quality assurance (QC/QA) procedures to obtain the best results,and suggests protocols for the use of reference materials (RM) and certified referencematerials (CRMs).
Best Practice tata kelola jurnal menuju akreditasi Nasional
Creators: name: Faizal Risdianto
Publisher: name: Zenodo
Year: 2022
Subjects: ARJUNA, SINTA, DOAJ, Web of Science, Scopus, Akreditasi Jurnal, internasionalisasi jurnal

description: Dengan membaca “Keputusan Dirjen DIKTI Kementerian Pendidikan, Kebudayaan, Riset, dan Teknologi Nomor 106/E/KPT/2021" tentang Pedoman Akreditasi Jurnal Ilmiah dengan jelas dapat kita bandingkan dengan model penilaian akreditasi sebelumnya kita bisa melihat naiknya penilaian pada bagian-bagian tertentu terutama untuk tujuan internasionalisasi Jurnal. Contohnya: Mengenai Keterlibatan Aktif Reviewer/Mitra Bebestari. Idealnya sebuah jurnal melibatkan mitra bebestari berkualifikasi internasional >50% dari berbagai institusi. Kemarin Skornya top –markotop 5.0 sekarang menjadi score 6.0 dengan kalimat “Melibatkan mitra bestari berkualifikasi internasional >50% (dari total mitra bestari) dan berasal dari 4 negara atau lebih. Kemudian dari score 3.0 diberikan kepada jurnal yang melibatkan mitra bebestari berkualifikasi nasional >50% dari berbagai institusi naik score dari 3.0 jadi 4.o dengan kalimat “Melibatkan mitra bestari berkualifikasi nasional >50% (dari total mitra bestari) dan berasal dari 2 hingga 3 negara”. Kualifikasi Dewan Editor Jurnal Ilmiah. Idealnya lebih dari 50% penyunting di sebuah jurnal sudah pernah menulis artikel di jurnal ilmiah internasional (Skor 3.0) naik menjadi score 5.0 dengan kalimat “Lebih dari 50% (dari total Dewan Penyunting) penyunting berkualifikasi internasional dan berasal dari 4 negara atau lebih (Skor 5.0)”
Structural stability of a dynamical system near a non-hyperbolic fixed point
Creators: name: Bauerschmidt, Roland
name: Brydges, David C.
name: Slade, Gordon
Publisher: name: arXiv
Year: 2012
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37C75, 82B28 (Primary), 37N20, 82B41 (Secondary)

description: We prove structural stability under perturbations for a class of discrete-time dynamical systems near a non-hyperbolic fixed point. We reformulate the stability problem in terms of the well-posedness of an infinite-dimensional nonlinear ordinary differential equation in a Banach space of carefully weighted sequences. Using this, we prove existence and regularity of flows of the dynamical system which obey mixed initial and final boundary conditions. The class of dynamical systems we study, and the boundary conditions we impose, arise in a renormalisation group analysis of the 4-dimensional weakly self-avoiding walk and the 4-dimensional n-component $|φ|^4$ spin model.
description: 31 pages, to appear in Ann. Henri Poincare
Zum 80. Geburtstag Ernst Barlachs
Creators: name: Roh, Franz
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Vol 3 No 1 (1950): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Error statistics and scalability of quantum error mitigation formulas
Creators: name: Qin, Dayue
name: Chen, Yanzhu
name: Li, Ying
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum computing promises advantages over classical computing in many problems. Nevertheless, noise in quantum devices prevents most quantum algorithms from achieving the quantum advantage. Quantum error mitigation provides a variety of protocols to handle such noise using minimal qubit resources . While some of those protocols have been implemented in experiments for a few qubits, it remains unclear whether error mitigation will be effective in quantum circuits with tens to hundreds of qubits. In this paper, we apply statistics principles to quantum error mitigation and analyse the scaling behaviour of its intrinsic error. We find that the error increases linearly $O(εN)$ with the gate number $N$ before mitigation and sub-linearly $O(ε' N^γ)$ after mitigation, where $γ\approx 0.5$, $ε$ is the error rate of a quantum gate, and $ε'$ is a protocol-dependent factor. The $\sqrt{N}$ scaling is a consequence of the law of large numbers, and it indicates that error mitigation can suppress the error by a larger factor in larger circuits. We propose the importance Clifford sampling as a key technique for error mitigation in large circuits to obtain this result.
Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collisions collected with the CMS detector at the LHC. The correlations are studied over a broad range of pseudorapidity, eta, and full azimuth, phi, as a function of charged particle multiplicity and particle transverse momentum, pt. In high-multiplicity events, a long-range (2 < abs(Delta(eta)) < 4), near-side (Delta(phi) approximately 0) structure emerges in the two-particle Delta(eta)-Delta(phi) correlation functions. This is the first observation of such correlations in proton-nucleus collisions, resembling the ridge-like correlations seen in high-multiplicity pp collisions at sqrt(s) = 7 TeV and in AA collisions over a broad range of center-of-mass energies. The correlation strength exhibits a pronounced maximum in the range of pt = 1-1.5 GeV and an approximately linear increase with charged particle multiplicity for high-multiplicity events. These observations are qualitatively similar to those in pp collisions when selecting the same observed particle multiplicity, while the overall strength of the correlations is significantly larger in pPb collisions.
description: Replaced with published version. Added journal reference and DOI
Quantum crystal oscillations in a superfluid liquid
Creators: name: Tsymbalenko, V. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the hydrodynamics of quantum 4He crystal oscillations in a superfluid liquid with involving the dynamics of atomically rough surfaces. It is shown that, due to enhancement of the kinetic growth coefficient as the temperature lowers, the reaction force of the liquid applied to the 4He crystal changes its character from the inertial to the viscous one vanishing as T->0. The model is confirmed by the experiments on the oscillations of the 4He crystal within the temperature range 0.54 - 1.43 K at frequencies 484 and 211 Hz. New type of a hydrodynamic instability is found. The instability occurs provided that the oscillation amplitude of the velocity becomes higher than ~3 cm/s.
description: 5 pp., 4 figs, v2. A misprint is corrected in Eq,(9)
Bemerkungen zu Herkunft und Bearbeitung eines Werkstoffes für Dechsel im Einbeck-Markoldendorfer Becken, Ldkr. Northeim
Creators: name: Werben, Ursula
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 72 (2003): Nachrichten aus Niedersachsens Urgeschichte
Negative differential thermal conductance by photonic transport in electronic circuits
Creators: name: Dey, Shobhit Saheb
name: Timossi, Giuliano
name: Amico, Luigi
name: Marchegiani, Giampiero
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The negative differential thermal conductance (NDTC) provides the key mechanism for realizing thermal transistors. This exotic effect has been the object of an extensive theoretical investigation, but the implementation is still limited to a few specific physical systems. Here, we consider a simple circuit of two electrodes exchanging heat through electromagnetic radiation. We demonstrate that the existence of an optimal condition for power transmission, well-known as impedance matching in electronics, provides a natural framework for engineering NDTC: the heat flux is reduced when the temperature increase is associated to an abrupt change of the electrode's impedance. As a case study, we analyze a hybrid structure based on thin-film technology, in which the increased resistance is due to a superconductor-resistive phase transition. For typical metallic superconductors operating below $1$K, NDTC reflects in a temperature drop of the order of a few mK by increasing the power supplied to the system. Our work draws new routes for implementing a thermal transistor in nanoscale circuits.
Undulations from amplified low frequency surface waves
Creators: name: Coutant, Antonin
name: Parentani, Renaud
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the scattering of gravity waves in longitudinal inhomogeneous stationary flows. When the flow becomes supercritical, counterflow propagating shallow waves are blocked and converted into deep waves. We show that the reflected waves are amplified in such a way that, in the zero-frequency limit, the free surface develops an undulation, i.e., a zero-frequency wave of large amplitude with nodes located at specific places. This amplification involves negative energy waves, and implies that the unperturbed flat surface is unstable against incoming perturbations of arbitrary small amplitude. The relation between this instability and black hole radiation (the Hawking effect) is discussed.
description: 19 pages, 2 figures - Pulished version. Added clarifications, and relations to fluid mechanics standard treatments
Process-Painting (Manifesto)
Creators: name: Gagnon, Alex
Publisher: name: Zenodo
Year: 2014
Subjects: manifesto
procedural
painting
process

description: This was my vision of what painting was, for me, circa January, 2004. Lots of things have changed since then, and yet I still hold onto these thoughts about what Painting CAN be. The sky is the limit!
Boundary feedback stabilization of a critical nonlinear JMGT equation with Neumann-undissipated part of the boundary
Creators: name: Bongarti, Marcelo
name: Lasiecka, Irena
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 35LXX

description: Boundary feedback stabilization of a critical, nonlinear Jordan--Moore--Gibson--Thompson (JMGT) equation is considered. JMGT arises in modeling of acoustic waves involved in medical/engineering treatments like lithotripsy, thermotherapy, sonochemistry, or any other procedures using High Intensity Focused Ultrasound (HIFU). It is a well-established and recently widely studied model for nonlinear acoustics (NLA): a third--order (in time) semilinear Partial Differential Equation (PDE) with the distinctive feature of predicting the propagation of ultrasound waves at \textit{finite} speed due to heat phenomenon know as \textit{second sound} which leads to the hyperbolic character of heat propagation. In practice, the JMGT dynamics is largely used for modeling the evolution of the acoustic velocity and, most importantly, the acoustic pressure as sound waves propagate through certain media. %Due to its sensitivity to different media, such model (or similar) is often used for medical/engineering treatments such as lithotripsy, thermotherapy, sonochemistry, or any other procedures using High Intensity Focused Ultrasound (HIFU). In this work, \emph{critical} refers to (usual) case where media--damping effects are non--existent or non--measurable and therefore cannot be relied upon for stabilization purposes. In this paper the issue of boundary stabilizability of originally unstable (JMGT) equation is resolved. Motivated by modeling aspects in HIFU technology, boundary feedback is supported only on a portion of the boundary, while the remaining part of the boundary is left free (available to control actions) . Since the boundary conditions imposed on the "free" part of the boundary fail to satisfy Lopatinski condition (unlike Dirichlet boundary conditions), the analysis of uniform stabilization from the boundary becomes very subtle and requires careful geometric considerations.
Klemens Wilhelmi, Zwei bronzezeitliche Kreisgrabenfriedhöfe bei Telgte, Kreis Warendorf
Creators: name: Van Lmpe, Luc
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Klemens Wilhelmi, Zwei bronzezeitliche Kreisgrabenfriedhöfe bei Telgte, Kreis Warendorf. Mit einem Beitrag von Bernd Herrmann. Bodenaltertümer Westfalens 17. Berichte des Westfälischen Museums für Archäologie. Amt für Bodendenkmalpflege, Landschaftsverband Westfalen- Lippe. Verlag Aschendorff, Münster 1981. VIII und 146 Seiten, 52 Tafelabbildungen, 7 Faltkarten
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Observation of Radiation Pressure Shot Noise on a Macroscopic Object
Creators: name: Purdy, T. P.
name: Peterson, R. W.
name: Regal, C. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The quantum mechanics of position measurement of a macroscopic object is typically inaccessible because of strong coupling to the environment and classical noise. Here we monitor a mechanical resonator subject to an increasingly strong continuous position measurement and observe a quantum mechanical backaction force that rises in accordance with the Heisenberg uncertainty limit. For our optically-based position measurements, the backaction takes the form of a fluctuating radiation pressure from the Poisson-distributed photons in the coherent measurement field, termed radiation pressure shot noise. We demonstrate a backaction force that is comparable in magnitude to the thermal forces in our system. Additionally, we observe a temporal correlation between fluctuations in the radiation force and in the position of the resonator.
description: 16 pages, 8 figures
Noël Duval (Hrsg.), Naissance des arts chrétiens. Atlas des monuments paléochrétiens de la France
Creators: name: Painter, Kenneth
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Noël Duval (Hrsg.), Naissance des arts chrétiens. Atlas des monuments paléochrétiens de la France. Mit Beiträgen von J. Fontaine, Ch. Pietri, J.-Ch. Picard, J. Guyon, P.-A. Février, P. Périn, B. K. Young, M. Colardelle, N. Gauthier, C. Brenot, M.-Ch. Maufus, X. Barral i Altet, C. Metzger, G.-R. Delahaye, F. Baratte, M. Gauthier, D. Foy, J.-P. Caillet. Atlas archéologiques de la France. Ministère de la Culture/Imprimerie nationale éditions, Paris 1991. 434 Seiten
description: Bonner Jahrbücher, Bd. 194.1994 (1995): Bonner Jahrbücher
Primordial Bispectrum from Multifield Inflation with Nonminimal Couplings
Creators: name: Kaiser, David I.
name: Mazenc, Edward A.
name: Sfakianakis, Evangelos I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Realistic models of high-energy physics include multiple scalar fields. Renormalization requires that the fields have nonminimal couplings to the spacetime Ricci curvature scalar, and the couplings can be large at the energy scales of early-universe inflation. The nonminimal couplings induce a nontrivial field-space manifold in the Einstein frame, and they also yield an effective potential in the Einstein frame with nontrivial curvature. The ridges or bumps in the Einstein-frame potential can lead to primordial non-Gaussianities of observable magnitude. We develop a covariant formalism to study perturbations in such models and calculate the primordial bispectrum. As in previous studies of non-Gaussianities in multifield models, our results for the bispectrum depend sensitively on the fields' initial conditions.
description: 41 pages, 11 figures. Minor changes and references added to match published version
Anatomy of octupole correlations in $^{96}$Zr with a symmetry-restored multidimensionally-constrained covariant density functional theory
Creators: name: Rong, Yu-Ting
name: Wu, Xian-Ye
name: Lu, Bing-Nan
name: Yao, Jiang-Ming
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A recent analysis based on the STAR measurement in relativistic heavy-ion collision experiments provides evidence of octupole correlation in the ground state of $^{96}$Zr, the description of which presents a challenge to nuclear structure models. In this work, we perform projection-after-variation calculations for $^{96}$Zr based on a multidimensionally-constrained relativistic Hartree-Bogoliubov model. Our results show that an octupole deformed shape is favored in energy after symmetry restoration, and this phenomenon cannot be reproduced in the pure mean-field calculations. These complex structures originate from the competition among various shell structures in this mass region. Our results suggest that the allowance of symmetry breaking at the mean-field level and the restoration of broken symmetries are essential elements for understanding the structure of $^{96}$Zr in density functional theories.
description: 10 pages, 4 figures
Quantum gates and multipartite entanglement resonances realized by non-uniform cavity motion
Creators: name: Friis, Nicolai
name: Huber, Marcus
name: Fuentes, Ivette
name: Bruschi, David Edward
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We demonstrate the presence of genuine multipartite entanglement between the modes of quantum fields in non-uniformly moving cavities. The transformations generated by the cavity motion can be considered as multipartite quantum gates. We present two setups for which multi-mode entanglement can be generated for bosons and fermions. As a highlight we show that the bosonic genuine multipartite correlations can be resonantly enhanced. Our results provide fundamental insights into the structure of Bogoliubov transformations and suggest strong links between quantum information, quantum fields in curved spacetimes and gravitational analogs by way of the equivalence principle.
description: v2: extended to 9 pages, 2 figures, appendix with explicit witness inequalities added; to appear in Phys. Rev. D; Ivette Fuentes previously published as Ivette Fuentes-Guridi and Ivette Fuentes-Schuller
A Zip-code for Quarks, Leptons and Higgs Bosons
Creators: name: Pena, Damian Kaloni Mayorga
name: Nilles, Hans Peter
name: Oehlmann, Paul-Konstantin
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The location of matter fields and the pattern of gauge symmetry in extra dimensions are crucial ingredients for string model building. We analyze realistic MSSM models from the heterotic Z6 Mini-Landscape and extract those properties that are vital for their success. We find that Higgs bosons and the top quark are not localized in extra dimensions and live in the full D=10 dimensional space-time. The first two families of quarks and leptons, however, live at specific fixed points in extra dimensional space and exhibit a (discrete) family symmetry. Within a newly constructed Z2XZ4 orbifold framework we further elaborate on these location properties and the appearance of discrete symmetries. A similar geometrical picture emerges. This particular Zip-code for quarks, leptons and Higgs bosons seems to be of more general validity and thus a useful guideline for realistic model building in string theory.
description: 42 pages, 8 figures. v2: published version, references added
How easy is it for investment managers to deploy their talent in green and brown stocks?
Creators: name: Ardia, David
name: Bluteau, Keven
name: Tran, Thien Duy
Publisher: name: arXiv
Year: 2022
Subjects: subject: Portfolio Management (q-fin.PM)
subject: General Economics (econ.GN)
subject: General Finance (q-fin.GN)
subject: FOS: Economics and business

description: We explore the realized alpha-performance heterogeneity in green and brown stocks' universes using the peer performance ratios of Ardia and Boudt (2018). Focusing on S&P 500 index firms over 2014-2020 and defining peer groups in terms of firms' greenhouse gas emission levels, we find that, on average, about 20% of the stocks differentiate themselves from their peers in terms of future performance. We see a much higher time-variation in this opportunity set within brown stocks. Furthermore, the performance heterogeneity has decreased over time, especially for green stocks, implying that it is now more difficult for investment managers to deploy their skills when choosing among low-GHG intensity stocks.
Multifield Dynamics of Higgs Inflation
Creators: name: Greenwood, Ross N.
name: Kaiser, David I.
name: Sfakianakis, Evangelos I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Higgs inflation is a simple and elegant model in which early-universe inflation is driven by the Higgs sector of the Standard Model. The Higgs sector can support early-universe inflation if it has a large nonminimal coupling to the Ricci spacetime curvature scalar. At energies relevant to such an inflationary epoch, the Goldstone modes of the Higgs sector remain in the spectrum in renormalizable gauges, and hence their effects should be included in the model's dynamics. We analyze the multifield dynamics of Higgs inflation and find that the multifield effects damp out rapidly after the onset of inflation, because of the gauge symmetry among the scalar fields in this model. Predictions from Higgs inflation for observable quantities, such as the spectral index of the power spectrum of primordial perturbations, therefore revert to their familiar single-field form, in excellent agreement with recent measurements. The methods we develop here may be applied to any multifield model with nonminimal couplings in which the ${\cal N}$ fields obey an $SO ({\cal N})$ symmetry in field space.
description: 27 pages, 8 figures. References added to match published version
Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5
Creators: name: Wu, Wenbin
name: Shi, Zeping
name: Du, Yuhan
name: Wang, Yuxiang
name: Qin, Fang
name: Meng, Xianghao
name: Liu, Binglin
name: Ma, Yuanji
name: Yan, Zhongbo
name: Ozerov, Mykhaylo
name: Zhang, Cheng
name: Lu, Hai-Zhou
name: Chu, Junhao
name: Yuan, Xiang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Landau band crossings typically stem from the intra-band evolution of electronic states in magnetic fields and enhance the interaction effect in their vicinity. Here in the extreme quantum limit of topological insulator HfTe5, we report the observation of a topological Lifshitz transition from inter-band Landau level crossings using magneto-infrared spectroscopy. By tracking the Landau level transitions, we demonstrate that band inversion drives the zeroth Landau bands to cross with each other after 4.5 T and forms one-dimensional Weyl mode with fundamental gap persistently closed. The unusual reduction of the zeroth Landau level transition activity suggests a topological Lifshitz transition at 21 T which shifts the Weyl mode close to Fermi level. As a result, a broad and asymmetric absorption feature emerges due to the Pauli blocking effect in one dimension, along with a distinctive negative magneto-resistivity. Our results provide a strategy for realizing one-dimensional Weyl quasiparticles in bulk crystals.
New limits on top squark NLSP from ATLAS 4.7 $fb^{-1}$ data
Creators: name: Choudhury, Arghya
name: Datta, Amitava
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using the ATLAS 4.7 $fb^{-1}$ data on new physics search in the jets + $\met$ channel, we obtain new limits on the lighter top squark ($\tilde t_1$) considering all its decay modes assuming that it is the next to lightest supersymmetric particle (NLSP). If the decay $\lstop$ $\ra c \lspone$ dominates and the production of dark matter relic density is due to NLSP - LSP co-annihilation then the lower limit on $\mlstop $ is 240 GeV. The limit changes to 200 GeV if the decay $\lstop$ $\ra b W \lspone$ dominates. Combining these results it follows that $\lstop $ NLSP induced baryogenesis is now constrained more tightly.
description: 9 pages, 2 figures, published in MPLA
Confronting Predictions Of Stellar Evolution Theory: The Case Of Single Field Stars
Creators: name: Feiden, Gregory
name: Mann, Andrew
name: Gaidos, Eric
name: Boyajian, Tabetha
Publisher: name: Zenodo
Year: 2015
Subjects: stars
stellar evolution
low mass stars
M-dwarf

description: Talk presented at the 225th meeting of the American Astronomical Society on 05 January 2015 in Session 112: Fundamental Properties of Low and Intermediate Mass Stars.
4D Flat-space scattering amplitude /$CFT_3$ correlator correspondence revisited
Creators: name: Jain, Sachin
name: Mehta, Abhishek
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we make connection between CFT$_3$ three point correlation function of conserved currents and 4D three point amplitude of general spin massless gauge field explicit. We do so by taking flat space limit of momentum space CFT correlation function and show how they reproduce flat space amplitudes. We then point out a mismatch between number of independent structures in 3D CFT correlator of conserved currents and 4D flat space covariant vertex of massless higher spin fields. This is in contrast with general expectation that counting of 3d CFT correlator and 4d flat space amplitude should match. This mismatch is even more pronounced in spinor helicity variables. We also point out an interesting relation between parity even and parity odd flat space amplitude in momentum space. This observation helps us to construct a new momentum space CFT strtucture which accounts for the mismatch. However we should mention that this extra CFT structure can't be constructed out of conserved currents and hence counting mismatch between CFT correlation of conserved currents and flat space amplitude of massless gauge field persists. Story in spinor helicity variable is more complicated and is discussed in detail. We further comment on the connection of CFT correlation function in spinor helicity variables to AdS amplitudes in spinor helicity variables and light cone variables.
description: 28 pages + 17 pages appendix, some typographical errors fixed and some more references added. Final results and conclusions unchanged
Three dimensional Symmetry Protected Topological Phase close to Antiferromagnetic Neel order
Creators: name: Xu, Cenke
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It is well-known that the Haldane phase of one-dimensional spin-1 chain is a symmetry protected topological (SPT) phase, which is described by a nonlinear Sigma model (NLSM) with a Theta-term at Theta = 2Pi. In this work we study a three dimensional SPT phase of SU(2N) antiferromagnetic spin system with a self-conjugate representation on every site. The spin ordered Neel phase of this system has a ground state manifold M = U(2N)/[U(N)xU(N)], and this system is described by a NLSM defined with manifold M. Since the homotopy group Pi4[M] = Z for N > 1, this NLSM can naturally have a Theta-term. We will argue that when Theta = 2Pi this NLSM describes a SPT phase. This SPT phase is protected by the SU(2N) spin symmetry, or its subgroup SU(N)xSU(N)xZ2, without assuming any other discrete symmetry. We will also construct a trial SU(2N) spin state on a 3d lattice, we argue that the long wavelength physics of this state is precisely described by the aforementioned NLSM with Theta = 2Pi.
description: 8 pages, 1 figure