cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Electronic and magnetic properties of epitaxial SrRhO3 films
Creators: name: Nichols, John
name: Yuk, Simuck F.
name: Sohn, Changhee
name: Jeen, Hyoungjeen
name: Freeland, John W.
name: Cooper, Valentino R.
name: Lee, Ho Nyung
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Strong interplay of fundamental order parameters in complex oxides are known to give rise to exotic physical phenomena. The 4d transition metal oxide SrRhO3 has generated much interest, but advances have been hindered by difficulties in preparing single crystalline phases. Here, we have epitaxially stabilized high quality single crystalline SrRhO3 films and investigated their structural, electronic, and magnetic properties. We determine that their properties significantly differ from the paramagnetic metallic ground state that governs bulk samples and are strongly related to rotations of the RhO6 octahedra.
Stability of the two-dimensional Fermi polaron
Creators: name: Griesemer, Marcel
name: Linden, Ulrich
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences
subject: 81V70 (Primary) 35P15 (Secondary)

description: A system composed of an ideal gas of N fermions interacting with an impurity particle in two space dimensions is considered. The interaction between impurity and fermions is given in terms of two-body point interactions whose strength is determined by the two-body binding energy, which is a free parameter of the model. If the mass of the impurity is 1.225 times larger than the mass of a fermion, it is shown that the energy is bounded below uniformly in the number N of fermions. This result improves previous, N-dependent lower bounds and it complements a recent, similar bound for the Fermi polaron in three space dimensions.
description: 10 pages (to appear in Letters in Mathematical Physics)
Chiral gauge theories on the lattice without gauge fixing?
Creators: name: Bock, Wolfgang
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We discuss two proposals for a non-perturbative formulation of chiral gauge theories on the lattice. In both cases gauge symmetry is broken by the regularization. We aim at a dynamical restoration of symmetry. If the gauge symmetry breaking is not too severe this procedure could lead in the continuum limit to the desired chiral gauge theory.
description: 3 pages, 1 figure, contribution to the 2nd IMACS conference on Computational Physics, UCSD/PTH 93-37
Gravitational waves from isolated neutron stars: mass dependence of r-mode instability
Creators: name: Mukhopadhyay, Somnath
name: Lahiri, Joydev
name: Atta, Debasis
name: Imam, Kouser
name: Basu, D. N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this work we study the r-mode instability windows and the gravitational wave signatures of neutron stars in the slow rotation approximation using the equation of state obtained from the density dependent M3Y effective interaction. We consider the neutron star matter to be $β$-equilibrated neutron-proton-electron matter at the core with a rigid crust. The fiducial gravitational and viscous timescales, the critical frequencies and the time evolutions of the frequencies and the rates of frequency change are calculated for a range of neutron star masses. We show that the young and hot rotating neutron stars lie in the r-mode instability region. We also emphasize that if the dominant dissipative mechanism of the r-mode is the shear viscosity along the boundary layer of the crust-core interface, then the neutron stars with low $L$ value lie in the r-mode instability region and hence emit gravitational radiation.
description: 15 pages including 4 tables & 11 figures; In this version Eq.(22) & Eq.(24) and correspondingly Figs.9-11 are corrected. arXiv admin note: text overlap with arXiv:1404.4360
HATS-43b, HATS-44b, HATS-45b, and HATS-46b: Four Short Period Transiting Giant Planets in the Neptune-Jupiter Mass Range
Creators: name: Brahm, R.
name: Hartman, J. D.
name: Jordan, A.
name: Bakos, G. A.
name: Espinoza, N.
name: Rabus, M.
name: Bhatti, W.
name: Penev, K.
name: Sarkis, P.
name: Suc, V.
name: Csubry, Z.
name: Bayliss, D.
name: Bento, J.
name: Zhou, G.
name: Mancini, L.
name: Henning, T.
name: Ciceri, S.
name: de Val-Borro, M.
name: Shectman, S.
name: Crane, J. D.
name: Arriagada, P.
name: Butler, P.
name: Teske, J.
name: Thompson, I.
name: Osip, D.
name: Diaz, M.
name: Schmidt, B.
name: Lazar, J.
name: Papp, I.
name: Sari, P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report the discovery of four short period extrasolar planets transiting moderately bright stars from photometric measurements of the HATSouth network coupled to additional spectroscopic and photometric follow-up observations. While the planet masses range from 0.26 to 0.90 M$_J$, the radii are all approximately a Jupiter radii, resulting in a wide range of bulk densities. The orbital period of the planets range from 2.7d to 4.7d, with HATS-43b having an orbit that appears to be marginally non-circular (e= 0.173$\pm$0.089). HATS-44 is notable for a high metallicity ([Fe/H]= 0.320$\pm$0.071). The host stars spectral types range from late F to early K, and all of them are moderately bright (13.3
description: 23 pages, 10 figures, submitted
Quantum oscillations and Dirac-Landau levels in Weyl superconductors
Creators: name: Liu, Tianyu
name: Franz, M.
name: Fujimoto, Satoshi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: When magnetic field is applied to metals and semimetals quantum oscillations appear as individual Landau levels cross the Fermi level. Quantum oscillations generally do not occur in superconductors (SC) because magnetic field is either expelled from the sample interior or, if strong enough, drives the material into the normal state. In addition, elementary excitations of a superconductor -- Bogoliubov quasiparticles -- do not carry a well defined electric charge and therefore do not couple in a simple way to the applied magnetic field. We predict here that in Weyl superconductors certain types of elastic strain have the ability to induce chiral pseudo-magnetic field which can reorganize the electronic states into Dirac-Landau levels with linear band crossings at low energy. The resulting quantum oscillations in the quasiparticle density of states and thermal conductivity can be experimentally observed under a bending deformation of a thin film Weyl SC and provide new insights into this fascinating family of materials.
description: Version accepted by PRB, minor changes, references added
title: ADCO, Ordre cistercien : comptes (1499-1515) (11 H 1162), f. 00281
Creators: name: de la Côte-d'Or, Archives départementales
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CBMA/CG21/F.PETOT/2019
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: comptes

description: Ordre cistercien : comptes (1499-1515), Archives départementales de la Côte-d'Or, (11 H 1162). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Ordre cistercien : comptes (1499-1515), Archives départementales de la Côte-d'Or, (11 H 1162), f. 00281, in Projet CBMA - Corpus Burgundiae Medii Aevi \[Ressource en ligne\], https:// manuscrits.cbma-project.eu/
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
Atom chips with free-standing two-dimensional electron gases: advantages and challenges
Creators: name: Sinuco-Leon, G. A.
name: Krueger, Peter
name: Fromhold, T. M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work we consider the advantages and challenges of using free-standing two-dimensional electron gases (2DEG) as active components in atom chips for manipulating ultracold ensembles of alkali atoms. We calculate trapping parameters achievable with typical high-mobility 2DEGs in an atom chip configuration, and identify advantages of this system for trapping atoms at sub-micron distances from the atom chip. We show how the sensitivity of atomic gases to magnetic field inhomogeneity can be exploited for controlling the atoms with quantum electronic devices and, conversely, using the atoms to probe the structural and transport properties of semiconductor devices.
description: Submitted to J. Mod. Opt. Special Issue: Quantum optics, cooling and collisions of ions and atoms
Strings from IIB Matrices
Creators: name: Li, Miao
Publisher: name: arXiv
Year: 1996
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: D-string action is constructed from IIB matrices, a spacetime commutator is essential in this construction. This hints at the central role of the spacetime uncertainty relation in a unified formulation of strings. Vertex operators of fundamental strings are also discussed.
description: 11 pages, harvmac, a number of 2\pi factors are inserted, a reference is added
Einstein-Podolsky-Rosen correlations of Dirac particles - quantum field theory approach
Creators: name: Caban, Pawel
name: Rembielinski, Jakub
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We calculate correlation function in the Einstein--Podolsky--Rosen type of experiment with massive relativistic Dirac particles in the framework of the quantum field theory formalism. We perform our calculations for states which are physically interesting and transforms covariantly under the full Lorentz group action, i.e. for pseudoscalar and vector state.
description: 9 pages, 2 figures. Published version
Breakdown of Migdal-Eliashberg theory; a determinant quantum Monte Carlo study
Creators: name: Esterlis, Ilya
name: Nosarzewski, Benjamin
name: Huang, Edwin W.
name: Moritz, Brian
name: Devereaux, Thomas P.
name: Scalapino, Douglas J.
name: Kivelson, Steven A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The superconducting (SC) and charge-density-wave (CDW) susceptibilities of the two dimensional Holstein model are computed using determinant quantum Monte Carlo (DQMC), and compared with results computed using the Migdal-Eliashberg (ME) approach. We access temperatures as low as 25 times less than the Fermi energy, $E_F$, which are still above the SC transition. We find that the SC susceptibility at low $T$ agrees quantitatively with the ME theory up to a dimensionless electron-phonon coupling $λ_0 \approx 0.4$ but deviates dramatically for larger $λ_0$. We find that for large $λ_0$ and small phonon frequency $ω_0 \ll E_F$ CDW ordering is favored and the preferred CDW ordering vector is uncorrelated with any obvious feature of the Fermi surface.
description: 7 pages, 7 figures. v2: discussion improved, added supplemental material
3D spectroscopy with VLT/GIRAFFE - III: Mapping electron densities in distant galaxies
Creators: name: Puech, M.
name: Flores, H.
name: Hammer, F.
name: Lehnert, M. D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We used the moderately high spectral resolution of FLAMES/GIRAFFE (R=10000) to derive electron densities from [OII] line ratios in 6 galaxies at z~0.55. These measurements have been done through the GIRAFFE multiple integral field units and are the very first mapping of electron densities in such distant objects. This allows us to confirm an outflow and identify the role of giant HII regions in galactic disks. Such measurements could be used in the future to investigate the nature of the physical processes responsible for the high star formations rates observed in galaxies between z~0.4 and z~1.
description: (1) GEPI, Obs. Meudon, France ;(2) MPE, Germany. See also ESO press release http://www.eso.org/outreach/press-rel/pr-2006/pr-10-06.html. To appear in A&A
Cosmological space-times with resolved Big Bang in Yang-Mills matrix models
Creators: name: Steinacker, Harold C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present simple solutions of IKKT-type matrix models that can be viewed as quantized homogeneous and isotropic cosmological space-times, with finite density of microstates and a regular Big Bang (BB). The BB arises from a signature change of the effective metric on a fuzzy brane embedded in Lorentzian target space, in the presence of a quantized 4-volume form. The Hubble parameter is singular at the BB, and becomes small at late times. There is no singularity from the target space point of view, and the brane is Euclidean "before" the BB. Both recollapsing and expanding universe solutions are obtained, depending on the mass parameters.
description: 22 pages, 4 figures. V2,V3: improved discussion, typos fixed. V3: published version
Impact of Non-Cognitive Interventions on Student Learning and Learning-Related Behaviors
Creators: name: Heffernan, Neil
name: Vanacore, Kirk
name: Gurung, Ashish
name: Liu, Allison
name: McReynolds, Andrew
Publisher: name: OSF Registries
Year: 2022
Subjects: subject: Educational Psychology
subject: Education
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: Educational Technology
subject: Learning Sciences

description: Noncognitive factors can influence students' learning and learning-related behaviors, but how to influence these factors and which factors impact learning behaviors is unclear. In this study, we examine the effects of six experimental conditions embedded in math mastery-learning activities hosted on a Computer Assisted Learning Platform (CALP). We are interested in how these conditions may affect students' response times (how long they pause before submitting an answer), help-seeking behavior (whether they access hints), persistence, and learning (problems-to-mastery and performance on post-test).
Memo Regarding Export-Import Bank Guarantee on Non-Agricultural Products
Creators: name: United States. Department Of State
Publisher: name: The University of Texas at Austin
Year: 1964
Subjects: Box 200 Folder 7
Box 200 Folder 07
Poland -- Politics and government -- 1945-1980
Poland -- Relations -- United States

description: Memo regarding bank guarantees concerning Rumania and Poland.
Memo Regarding Guarantees on Short and Medium Term Commercial Credits
Creators: name: United States. Department Of State
Publisher: name: The University of Texas at Austin
Year: 1964
Subjects: Box 200 Folder 7
Box 200 Folder 07
Poland -- Politics and government -- 1945-1980
Poland -- Relations -- United States

description: Memo concerning future talks with Rumanians and Poles concerning extending Export-Import bank guarantees on short and medium term commercial credits.
Four-Brane and Six-Brane Interactions in M(atrix) Theory
Creators: name: Lifschytz, Gilad
Publisher: name: arXiv
Year: 1996
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the proposed description of configurations with four-branes and six-branes in m(atrix) theory. Computing the velocity dependent potential between these configurations and gravitons and membranes, we show that they agree with the short distance string results computed in type IIa string theory. Due to the ``closeness'' of these configuration to a supersymmetric configuration the m(atrix) theory reproduces the correct long distance behavior.
description: 14 pages, latex
Memo Regarding Visit of Postmaster General to Poland
Creators: name: United States. Department Of State
Publisher: name: The University of Texas at Austin
Year: 1964
Subjects: Box 200 Folder 7
Box 200 Folder 07
Poland -- Politics and government -- 1945-1980
Poland -- Relations -- United States

description: Memo extending invitation to John Gronouski to visit Poland in June 1964 and intent to coordinate logistics.
Exact results for a fractional derivative of elementary functions
Creators: name: Shchedrin, Gavriil
name: Smith, Nathanael C.
name: Gladkina, Anastasia
name: Carr, Lincoln D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present exact analytical results for the Caputo fractional derivative of a wide class of elementary functions, including trigonometric and inverse trigonometric, hyperbolic and inverse hyperbolic, Gaussian, quartic Gaussian, and Lorentzian functions. These results are especially important for multi-scale physical systems, such as porous materials, disordered media, and turbulent fluids, in which transport is described by fractional partial differential equations. The exact results for the Caputo fractional derivative are obtained from a single generalized Euler's integral transform of the generalized hyper-geometric function with a power-law argument. We present a proof of the generalized Euler's integral transform and directly apply it to the exact evaluation of the Caputo fractional derivative of a broad spectrum of functions, provided that these functions can be expressed in terms of a generalized hyper-geometric function with a power-law argument. We determine that the Caputo fractional derivative of elementary functions is given by the generalized hyper-geometric function. Moreover, we show that in the most general case the final result cannot be reduced to elementary functions, in contrast to both the Liouville-Caputo and Fourier fractional derivatives. However, we establish that in the infinite limit of the argument of elementary functions, all three definitions of a fractional derivative - the Caputo, Liouville-Caputo, and Fourier- converge to the same result given by the elementary functions. Finally, we prove the equivalence between Liouville-Caputo and Fourier fractional derivatives.
Telegram Regarding White House Millenium Celebration
Creators: name: United States. Embassy (Warsaw)
Publisher: name: The University of Texas at Austin
Year: 1966
Subjects: Box 200 Folder 5
Box 200 Folder 05
Poland -- Politics and government -- 1945-1980
Poland -- Relations -- Soviet Union

description: Telegram suggesting remarks on East-West policy for White House millenium celebration.
Generating Grid States From Schrödinger Cat States without Post-Selection
Creators: name: Weigand, Daniel J.
name: Terhal, Barbara M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Grid (or comb) states are an interesting class of bosonic states introduced by Gottesman, Kitaev and Preskill to encode a qubit into an oscillator. A method to generate or `breed' a grid state from Schrödinger cat states using beam splitters and homodyne measurements is known, but this method requires post-selection. In this paper we show how post-processing of the measurement data can be used to entirely remove the need for post-selection, making the scheme much more viable. We bound the asymptotic behavior of the breeding procedure and demonstrate the efficacy of the method numerically.
description: 10 pages + 5 page appendix, 5 figures
Partially quenched QCD and staggered fermions
Creators: name: Bernard, C.
name: Golterman, M.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We summarize results for partially quenched chiral perturbation theory and indicate an application to staggered fermion QCD in which the square root of the determinant is taken to reduce the number of flavors from four to two.
description: 3 pages, contribution to Lattice'93. latex file, style file espcrc2.sty needed (appended at the end)
Memo Regarding Department Endorsement for Gronouski Visit
Creators: name: United States. Department Of State
Publisher: name: The University of Texas at Austin
Year: 1964
Subjects: Box 200 Folder 7
Box 200 Folder 07
Poland -- Politics and government -- 1945-1980
Poland -- Relations -- United States

description: Memo to Bundy from Read endorsing the visit of Postmaster General Gronouski to visit Poland.
Note Regarding Inquiry for State Recommendation
Creators: name: United States. Department Of State
Publisher: name: The University of Texas at Austin
Year: 1964
Subjects: Box 200 Folder 7
Box 200 Folder 07
Poland -- Politics and government -- 1945-1980
Poland -- Relations -- United States

description: Note to Smith from Read inquiring about State recommendation on Gronouski's visit to Poland.
From p-branes to Cosmology
Creators: name: Lu, H.
name: Mukherji, S.
name: Pope, C. N.
Publisher: name: arXiv
Year: 1996
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the relationship between static p-brane solitons and cosmological solutions of string theory or M-theory. We discuss two different ways in which extremal p-branes can be generalised to non-extremal ones, and show how wide classes of recently discussed cosmological models can be mapped into non-extremal p-brane solutions of one of these two kinds. We also extend previous discussions of cosmological solutions to include some that make use of cosmological-type terms in the effective action that can arise from the generalised dimensional reduction of string theory or M-theory.
description: Latex, 24 pages, no figure
Understanding caustic crossings in giant arcs: characteristic scales, event rates, and constraints on compact dark matter
Creators: name: Oguri, Masamune
name: Diego, Jose M.
name: Kaiser, Nick
name: Kelly, Patrick L.
name: Broadhurst, Tom
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The recent discovery of fast transient events near critical curves of massive galaxy clusters, which are interpreted as highly magnified individual stars in giant arcs due to caustic crossing, opens up the possibility of using such microlensing events to constrain a range of dark matter models such as primordial black holes and scalar field dark matter. Based on a simple analytic model, we study lensing properties of a point mass lens embedded in a high magnification region, and derive the dependence of the peak brightness, microlensing time scales, and event rates on the mass of the point mass lens as well as the radius of a source star that is magnified. We find that the lens mass and source radius of the first event MACS J1149 Lensed Star 1 (LS1) are constrained, with the lens mass range of $0.1~M_\odot \lesssim M \lesssim 4\times 10^3M_\odot$ and the source radius range of $40~R_\odot \lesssim R \lesssim 260~R_\odot$. In the most plausible case with $M\approx 0.3~M_\odot$ and $R\approx 180~R_\odot$, the source star should have been magnified by a factor of $\approx 4300$ at the peak. The derived lens properties are fully consistent with the interpretation that MACS J1149 LS1 is a microlensing event produced by a star that contributes to the intra-cluster light. We argue that compact dark matter models with high fractional mass densities for the mass range $10^{-5}M_\odot \lesssim M\lesssim 10^2M_\odot$ are inconsistent with the observation of MACS J1149 LS1 because such models predict too low magnifications. Our work demonstrates a potential use of caustic crossing events in giant arcs to constrain compact dark matter.
description: 16 pages, 8 figures, accepted for publication in Phys. Rev. D
Experimental Realization of $1 \to 2$ Asymmetric Phase-Covariant Quantum Cloning
Creators: name: Chen, Hongwei
name: Zhou, Xianyi
name: Suter, Dieter
name: Du, Jiangfeng
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While exact cloning of an unknown quantum state is prohibited by the linearity of quantum mechanics, approximate cloning is possible and has been used, e.g., to derive limits on the security of quantum communication protocols. In the case of asymmetric cloning, the information from the input state is distributed asymmetrically between the different output states. Here, we consider asymmetric phase-covariant cloning, where the goal is to optimally transfer the phase information from a single input qubit to different output qubits. We construct an optimal quantum cloning machine for two qubits that does not require ancilla qubits and implement it on an NMR quantum information processor.
description: 6 pages, 5 figures
The infinite Fibonacci groups and relative asphericity
Creators: name: Edjvet, M.
name: Juhasz, A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F05, 57M07

description: We prove that the generalised Fibonacci group F(r,n) is infinite for (r,n) in {(7 + 5k,5), (8 + 5k,5)} where k is greater than or equal to 0. This together with previously known results yields a complete classification of the finite F(r,n), a problem that has its origins in a question by J H Conway in 1965. The method is to show that a related relative presentation is aspherical from which it can be deduced that the groups are infinite.
description: 106 pages, 64 figures
Extending the Accuracy of the SNAP Interatomic Potential Form
Creators: name: Wood, Mitchell A.
name: Thompson, Aidan P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The Spectral Neighbor Analysis Potential (SNAP) is a classical interatomic potential that expresses the energy of each atom as a linear function of selected bispectrum components of the neighbor atoms. An extension of the SNAP form is proposed that includes quadratic terms in the bispectrum components. The extension is shown to provide a large increase in accuracy relative to the linear form, while incurring only a modest increase in computational cost. The mathematical structure of the quadratic SNAP form is similar to the embedded atom method (EAM), with the SNAP bispectrum components serving as counterparts to the two-body density functions in EAM. The effectiveness of the new form is demonstrated using an extensive set of training data for tantalum structures. Similarly to artificial neural network potentials, the quadratic SNAP form requires substantially more training data in order to prevent overfitting. The quality of this new potential form is measured through a robust cross-validation analysis.
Measurement of the cross-section for electroweak production of dijets in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The cross-section for the production of two jets in association with a leptonically decaying Z boson ($Zjj$) is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV, using data recorded with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 3.2 fb$^{-1}$. The electroweak $Zjj$ cross-section is extracted in a fiducial region chosen to enhance the electroweak contribution relative to the dominant Drell-Yan $Zjj$ process, which is constrained using a data-driven approach. The measured fiducial electroweak cross-section is $σ^{Zjj}_{EW}= 119\pm 16 (\mathrm{stat.}) \pm 20 (\mathrm{syst.})\pm 2 (\mathrm{lumi.})$ for dijet invariant mass greater than 250 GeV, and $34.2\pm 5.8 (\mathrm{stat.})\pm 5.5 (\mathrm{syst.})\pm 0.7 (\mathrm{lumi.})$ for dijet invariant mass greater than 1 TeV. Standard Model predictions are in agreement with the measurements. The inclusive $Zjj$ cross-section is also measured in six different fiducial regions with varying contributions from electroweak and Drell-Yan $Zjj$ production.
description: 40 pages in total, author list starting page 24, 6 figures, 5 tables, published in Phys. Lett. B. All figures and tables including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2016-09/
Mixmaster dynamics in the dust time gauge
Creators: name: Ali, Masooma
name: Husain, Viqar
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the Hamiltonian dynamics of the dust-Bianchi IX universe in dust time gauge. This model has three physical metric degrees of freedom, with evolution determined by a time-independent physical Hamiltonian. This approach gives a new physical picture where dust-Bianchi IX dynamics is described by oscillations between dust-Kasner solutions, rather than between vacuum-Kasner solutions. We derive a generalized transition law between these phases, which has a matter component. Sufficiently close to a singularity, we show that this law reduces to the vacuum Belinski-Khalatnikov-Lifshitz map. We include an analysis with dust and a scalar field. Lastly, we describe a path integral quantization using the dust-time physical Hamiltonian and derive an effective action for the dust-Kasner model by integrating out the anisotropy degrees of freedom.
description: 27 pages, 4 figures
Image Labeling Based on Graphical Models Using Wasserstein Messages and Geometric Assignment
Creators: name: Hühnerbein, Ruben
name: Savarino, Fabrizio
name: Åström, Freddie
name: Schnörr, Christoph
Publisher: name: arXiv
Year: 2017
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Numerical Analysis (math.NA)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 62H35, 62M40, 65K10, 68U10

description: We introduce a novel approach to Maximum A Posteriori inference based on discrete graphical models. By utilizing local Wasserstein distances for coupling assignment measures across edges of the underlying graph, a given discrete objective function is smoothly approximated and restricted to the assignment manifold. A corresponding multiplicative update scheme combines in a single process (i) geometric integration of the resulting Riemannian gradient flow and (ii) rounding to integral solutions that represent valid labelings. Throughout this process, local marginalization constraints known from the established LP relaxation are satisfied, whereas the smooth geometric setting results in rapidly converging iterations that can be carried out in parallel for every edge.
Note Regarding Invitation of Gronouski to Poland
Creators: name: Poland. Polish People's Republic
Publisher: name: The University of Texas at Austin
Year: 1963
Subjects: Box 200 Folder 7
Box 200 Folder 07
Poland -- Politics and government -- 1945-1980
Poland -- Relations -- United States

description: Note to Postmaster General Gronouski from Zymunt Moskwa inviting Gronouski and wife as guests in Poland at convenient time.
Erratic server behavior detection using machine learning on streams of monitoring data
Creators: name: Adam, Martin
name: Magnoni, Luca
name: Adamova, Dagmar
name: PilÃ¡T, Martin
Publisher: name: Zenodo
Year: 2019

description: With the explosion of the number of distributed applications, a new dynamic server environment emerged grouping servers into clusters, utilization of which depends on the current demand for the application. To provide reliable and smooth services it is crucial to detect and fix possible erratic behavior of individual servers in these clusters. Use of standard techniques for this purpose requires manual work and delivers suboptimal results. Using only application agnostic monitoring metrics our machine learning based method analyzes the recent performance of the inspected server as well as the state of the rest of the cluster, thus checking not only the behavior of the single server, but the load on the whole distributed application as well. We have implemented our method in a Spark job running in the CERN MONIT infrastructure. In this contribution we present results of testing multiple machine learning algorithms and preprocessing techniques to identify the servers erratic behavior. We also discuss the challenges of deploying our new method into production.
Model-based Iterative Reconstruction for Flat-Panel Cone-Beam CT with Focal Spot Blur, Detector Blur, and Correlated Noise
Creators: name: Tilley, Steven
name: Siewerdsen, Jeffrey H.
name: Stayman, J. Webster
Publisher: name: arXiv
Year: 2017
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: While model-based reconstruction methods have been successfully applied to flat-panel cone-beam CT (FP-CBCT) systems, typical implementations ignore both spatial correlations in the projection data as well as system blurs due to the detector and focal spot in the x-ray source. In this work, we develop a forward model for flat-panel-based systems that includes blur and noise correlation associated with finite focal spot size and an indirect detector (e.g., scintillator). This forward model is used to develop a staged reconstruction framework where projection data are deconvolved and log-transformed, followed by a generalized least-squares reconstruction that utilizes a non-diagonal statistical weighting to account for the correlation that arises from the acquisition and data processing chain. We investigate the performance of this novel reconstruction approach in both simulated data and in CBCT test-bench data. In comparison to traditional filtered backprojection and model-based methods that ignore noise correlation, the proposed approach yields a superior noise-resolution tradeoff. For example, for a system with 0.34 mm FWHM scintillator blur and 0.70 FWHM focal spot blur, using the a correlated noise model instead of an uncorrelated noise model increased resolution by 42% (with variance matched at 6.9 x 10^-8 mm^-2 ). While this advantage holds across a wide range of systems with differing blur characteristics, the improvements are greatest for systems where source blur is larger than detector blur.
Wakes of ram pressure stripped disc galaxies
Creators: name: Roediger, E.
name: Brueggen, M.
name: Hoeft, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Spiral galaxies that move through the intracluster medium lose a substantial amount of their gas discs due to ram pressure stripping. The recent observations of NGC 4388 by Oosterloo & van Gorkom 2005 reveal a tail of stripped gas of ~ 100 kpc behind the source galaxy. We present first 3D hydrodynamical simulations of the evolution of such ram pressure stripped tails. We find that if the ICM wind does not vary significantly over a period of a few 100 Myr, subsonic galaxies produce a tail with regular features similar to a von-Karman vortex street. In this case, the tail widens systematically by about 45 kpc per 100 kpc distance behind the source galaxy. The widening rate is independent of the galaxy's inclination for a large range of inclinations. For supersonic galaxies, the tail is more irregular than for subsonic ones. The tail observed for NGC 4388 is narrower than the tails in our simulations. Reasons for this difference may be additional physical processes such as heat conduction or viscosity. In addition, we conclude that the observed S-shape of this tail is not due to von Karman oscillations, because this galaxy is likely to move supersonically. A reason for the observed shape may be motions in the ambient ICM. Finally, we discuss implications for the distribution of metals in the ICM due to ram pressure stipping.
description: 11 pages, 12 figures,submitted to MNRAS, for pdf with high resolution figures see http://www.faculty.iu-bremen.de/eroediger/PLOTLINKS/roediger_wakes.pdf
Jiskefet, a bookkeeping application for ALICE
Creators: name: Teitsma, Marten
name: Barroso, Vasco Chibante
name: Boeschoten, Pascal
name: Hendriks, Patrick
Publisher: name: Zenodo
Year: 2019

description: A new bookkeeping system called Jiskefet is being developed for A Large Ion Collider Experiment (ALICE) during Long Shutdown 2, to be in production until the end of LHC Run 4 (2029). Jiskefet unifies two functionalities. The first is gathering, storing and presenting metadata associated with the operations of the ALICE experiment. The second is tracking the asynchronous processing of the physics data. It will replace the existing ALICE Electronic Logbook and AliMonitor, allowing for a technology refresh and the inclusion of new features based on the experience collected during Run 1 and Run 2. The front end leverages web technologies much in use nowadays such as TypeScript and NodeJS and is adaptive to various clients such as tablets, mobile device and other screens. The back end includes a Swagger based REST API and a relational database. This paper will describe the current status of the development, the initial experience in detector standalone commissioning setups and the future plans. It will also describe the organization of the work done by various student teams who work on Jiskefet in sequential and parallel semesters and how continuity is guaranteed by using guidelines on coding, documentation and development.
Embodied Evolution in Collective Robotics: A Review
Creators: name: Bredeche, Nicolas
name: Haasdijk, Evert
name: Prieto, Abraham
Publisher: name: arXiv
Year: 2017
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: Multiagent Systems (cs.MA)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper provides an overview of evolutionary robotics techniques applied to on-line distributed evolution for robot collectives -- namely, embodied evolution. It provides a definition of embodied evolution as well as a thorough description of the underlying concepts and mechanisms. The paper also presents a comprehensive summary of research published in the field since its inception (1999-2017), providing various perspectives to identify the major trends. In particular, we identify a shift from considering embodied evolution as a parallel search method within small robot collectives (fewer than 10 robots) to embodied evolution as an on-line distributed learning method for designing collective behaviours in swarm-like collectives. The paper concludes with a discussion of applications and open questions, providing a milestone for past and an inspiration for future research.
description: 23 pages, 1 figure, 1 table
Simulations with Complex Measures
Creators: name: Kieu, T D
name: Griffin, C J
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Towards a solution to the sign problem in the simulations of systems having indefinite or complex-valued measures, we propose a new approach which yields statistical errors smaller than the crude Monte Carlo using absolute values of the original measures. The 1D complex-coupling Ising model is employed as an illustration.
description: 3 pages, postcript (95K), contribution to LAT93, UM-P-93/108
The GridKa Tape Storage: various performance test results and current improvements
Creators: name: Haykuhi Musheghyan
name: Petzold, Andreas
name: Heiss, Andreas
name: Ressmann, Doris
name: Beitzinger, Martin
Publisher: name: Zenodo
Year: 2019

description: Data growth over several years within HEP experiments requires a wider use of storage systems for WLCG Tiered Centers. It also increases the complexity of storage systems, which includes the expansion of hardware components and thereby complicates existing software products more. To cope with such systems is a non-trivial task and requires highly qualified specialists. Storing petabytes of data on tape storage is a still the most cost-effective way. Year after year, the use of a tape storage increases, consequently a detailed study of its optimal use and verification of performance is a key aspect for such a system. It includes several factors, such as performing various performance tests, identifying and eliminating bottlenecks, properly adjusting and improving the current GridKa setup, etc. At present, GridKa uses dCache as the storage system in frontend and TSM as the tape storage backend. dCache provides a plugin interface for exchanging data between dcache and tape. TSS is a TSM-based client developed by the GridKa team. TSS has been in production for over 10 years. The interaction between the GridKa dCache instance and TSM is accomplished using additional scripts that can be further optimized to improve the overall performance of the tape storage. This contribution provides detailed information on the results of various performance tests performed on the GridKa tape and significant improvements of our tape storage performance.
Magellan/M2FS Spectroscopy of Galaxy Clusters: Stellar Population Model and Application to Abell 267
Creators: name: Tucker, Evan
name: Walker, Matthew G.
name: Mateo, Mario
name: Olszewski, Edward W.
name: Bailey, John I.
name: Crane, Jeffrey D.
name: Shectman, Stephen A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We report the results of a pilot program to use the Magellan/M2FS spectrograph to survey the galactic populations and internal kinematics of galaxy clusters. For this initial study, we present spectroscopic measurements for $223$ quiescent galaxies observed along the line of sight to the galaxy cluster Abell 267 ($z\sim0.23$). We develop a Bayesian method for modeling the integrated light from each galaxy as a simple stellar population, with free parameters that specify redshift ($v_\mathrm{los}/c$) and characteristic age, metallicity ($\mathrm{[Fe/H]}$), alpha-abundance ($[α/\mathrm{Fe}]$), and internal velocity dispersion ($σ_\mathrm{int}$) for individual galaxies. Parameter estimates derived from our 1.5-hour observation of A267 have median random errors of $σ_{v_\mathrm{los}}=20\ \mathrm{km\ s^{-1}}$, $σ_{\mathrm{Age}}=1.2\ \mathrm{Gyr}$, $σ_{\mathrm{[Fe/H]}}=0.11\ \mathrm{dex}$, $σ_{[α/\mathrm{Fe}]}=0.07\ \mathrm{dex}$, and $σ_{σ_\mathrm{int}}=20\ \mathrm{km\ s^{-1}}$. In a companion paper, we use these results to model the structure and internal kinematics of A267.
description: 16 pages, 11 figures, accepted for publication in The Astronomical Journal
QED loop effects in the spacetime background of a Schwarzschild black hole
Creators: name: Emelyanov, Slava
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The black-hole evaporation implies that the quantum-field propagators in a local Minkowski frame acquire a correction, which gives rise to this process. The modification of the propagators causes, in turn, non-trivial local effects due to the radiative/loop diagrams in non-linear QFTs. In particular, there should be imprints of the evaporation in QED, if one goes beyond the tree-level approximation. Of special interest in this respect is the region near the black-hole horizon, which, already at tree level, appears to show highly non-classical features, e.g., negative energy density and energy flux into the black hole.
description: Conference: C17-07-24.3. This is a contribution to the Proceedings of the 3rd Karl Schwarzschild Meeting (FIAS, 24-28 July, 2017), based on the talk that has been awarded the Karl Schwarzschild Prize
Consistency between deep crustal heating of strange stars in superbursters and soft X-ray transients
Creators: name: Stejner, Morten
name: Madsen, Jes
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Both superbursters and soft X-ray transients probe the process of deep crustal heating in compact stars. It was recently shown that the transfer of matter from crust to core in a strange star can heat the crust and ignite superbursts provided certain constraints on the strange quark matter equation of state are fulfilled. We derive corresponding constraints on the equation of state for soft X-ray transients assuming their quiescent emission is powered in the same way, and further discuss the time dependence of this heating mechanism in transient systems. We approach this using a simple parametrized model for deep crustal heating in strange stars assuming slow neutrino cooling in the core and blackbody photon emission from the surface.The constraints derived for hot frequently accreting soft X-ray transients are always consistent with those for superbursters. The colder sources are consistent for low values of the quark matter binding energy, heat conductivity and neutrino emissivity. The heating mechanism is very time dependent which may help to explain cold sources with long recurrence times. Thus deep crustal heating in strange stars can provide a consistent explanation for superbursters and soft X-ray transients.
description: 12 pages, 6 figures. Changes include some references and clarifications in the text, revised figures and an added discussion on KS1731-260 and MXB1659-29. Final version published in A&A