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Black hole spectroscopy: Systematic errors and ringdown energy estimates

Physical Review D 2018年第4期97卷 044048-044048页

作者： Vishal Baibhav Emanuele Berti Vitor Cardoso Gaurav Khanna Department of Physics and Astronomy University of Mississippi University Mississippi 38677 USA CENTRA Departamento de Física Instituto Superior Técnico Universidade de Lisboa Avenida Rovisco Pais 1 1049 Lisboa Portugal Perimeter Institute for Theoretical Physics Waterloo Ontario N2L 2Y5 Canada Department of Physics and Center for Scientific Computing and Visualization Research University of Massachusetts Dartmouth North Dartmouth Massachusetts 02747 USA

The relaxation of a distorted black hole to its final state provides important tests of general relativity within the reach of current and upcoming gravitational wave facilities. In black hole perturbation theory, this phase consists of a simple linear superposition of exponentially damped sinusoids (the quasinormal modes) and of a power-law tail. How many quasinormal modes are necessary to describe waveforms with a prescribed precision? What error do we incur by only including quasinormal modes, and not tails? What other systematic effects are present in current state-of-the-art numerical waveforms? These issues, which are basic to testing fundamental physics with distorted black holes, have hardly been addressed in the literature. We use numerical relativity waveforms and accurate evolutions within black hole perturbation theory to provide some answers. We show that (i) a determination of the fundamental l=m=2 quasinormal frequencies and damping times to within 1% or better requires the inclusion of at least the first overtone, and preferably of the first two or three overtones; (ii) a determination of the black hole mass and spin with precision better than 1% requires the inclusion of at least two quasinormal modes for any given angular harmonic mode (ℓ, m). We also improve on previous estimates and fits for the ringdown energy radiated in the various multipoles. These results are important to quantify theoretical (as opposed to instrumental) limits in parameter estimation accuracy and tests of general relativity allowed by ringdown measurements with high signal-to-noise ratio gravitational wave detectors.

关键词： Classical black holes Astronomical black holes

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Deconvolving pulsar signals with cyclic spectroscopy: A systematic evaluation

arXiv

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arXiv 2020年

作者： Dolch, Timothy Stinebring, Daniel R. Jones, Glenn Zhu, Hengrui Lynch, Ryan S. Cohen, Tyler Demorest, Paul B. Lam, Michael T. Levin, Lina McLaughlin, Maura A. Palliyaguru, Nipuni T. Department of Physics Hillsdale College 33 E. College Street HillsdaleMI49242 United States Eureka Scientific Inc. 2452 Delmer Street Suite 100 OaklandCA94602-3017 United States Department of Physics and Astronomy Oberlin College OberlinOH44074 United States Rigetti Computing Inc. 775 Heinz Ave BerkeleyCA94710 United States Columbia Astrophysics Laboratory Columbia University NY10027 United States Green Bank Observatory P.O. Box 2 Green BankWV24944 United States Department of Physics New Mexico Institute of Mining and Technology 801 Leroy Place SocorroNM87801 United States National Radio Astronomy Observatory 1003 Lopezville Rd. SocorroNM87801 United States School of Physics and Astronomy Rochester Institute of Technology RochesterNY14623 United States Laboratory for Multiwavelength Astronomy Rochester Institute of Technology RochesterNY14623 United States Jodrell Bank Centre for Astrophysics University of Manchester ManchesterM13 9PL United Kingdom Department of Physics and Astronomy West Virginia University P.O. Box 6315 MorgantownWV26506 United States Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building MorgantownWV26505 United States Department of Physics & Astronomy Texas Tech University LubbockTX79409 United States

Radio pulsar signals are significantly perturbed by their propagation through the ionized interstellar medium. In addition to the frequency-dependent pulse times of arrival due to dispersion, pulse shapes are also distorted and shifted, having been scattered by the inhomogeneous interstellar plasma, affecting pulse arrival times. Understanding the degree to which scattering affects pulsar timing is important for gravitational wave detection with pulsar timing arrays (PTAs), which depend on the reliability of pulsars as stable clocks with an uncertainty of ∼100 ns or less over ∼10 yr or more. Scattering can be described as a convolution of the intrinsic pulse shape with an impulse response function representing the effects of multipath propagation. In previous studies, the technique of cyclic spectroscopy has been applied to pulsar signals to deconvolve the effects of scattering from the original emitted signals, increasing the overall timing precision. We present an analysis of simulated data to test the quality of deconvolution using cyclic spectroscopy over a range of parameters characterizing interstellar scattering and pulsar signal-to-noise ratio. We show that cyclic spectroscopy is most effective for high-S/N and/or highly scattered pulsars. We conclude that cyclic spectroscopy could play an important role in scattering correction to distant populations of highly scattered pulsars not currently included in PTAs. For future telescopes and for current instruments such as the Green Bank Telescope upgraded with the ultrawide bandwidth (UWB) receiver, cyclic spectroscopy could potentially double the number of PTA-quality pulsars. Copyright © 2020, The Authors. All rights reserved.

关键词： Pulsars

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An environment for sustainable research software in Germany and beyond: Current state, open challenges, and call for action

arXiv

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arXiv 2020年

作者： Anzt, Hartwig Bach, Felix Druskat, Stephan Löffler, Frank Loewe, Axel Renard, Bernhard Y. Seemann, Gunnar Struck, Alexander Achhammer, Elke Aggarwal, Piush Appel, Franziska Bader, Michael Brusch, Lutz Busse, Christian Chourdakis, Gerasimos Dabrowski, Piotr W. Ebert, Peter Flemisch, Bernd Friedl, Sven Fritzsch, Bernadette Funk, Maximilian D. Gast, Volker Goth, Florian Grad, Jean-Noël Hermann, Sibylle Hohmann, Florian Janosch, Stephan Kutra, Dominik Linxweiler, Jan Muth, Thilo Peters-Kottig, Wolfgang Rack, Fabian Raters, Fabian H.C. Rave, Stephan Reina, Guido Reißig, Malte Ropinski, Timo Schaarschmidt, Joerg Seibold, Heidi Thiele, Jan P. Uekerman, Benjamin Unger, Stefan Weeber, Rudolf Germany Innovative Computing Lab University of Tennessee KnoxvilleTN United States Department of English Studies Friedrich Schiller University Jena Germany Germany Department of Computer Science Humboldt-Universität zu Berlin Germany Heinz Nixdorf Chair for Distributed Information Systems Friedrich Schiller University Jena Germany Michael Stifel Center Jena Germany Center for Computation and Technology Louisiana State University Baton Rouge United States Germany Robert Koch Institute Berlin Germany Hasso Plattner Institute Faculty of Digital Engineering University of Potsdam Germany Institute for Experimental Cardiovascular Medicine University Heart Centre Freiburg Bad Krozingen Germany Faculty of Medicine University of Freiburg Freiburg Germany Matters of Activity. Image Space Material. Cluster of Excellence at Humboldt-Universität zu Berlin Germany Technische Universität München Germany Language Technology Lab Universität Duisburg-Essen Germany Germany Department of Informatics Technical University of Munich Germany Technische Universität Dresden Germany Deutsches Krebsforschungszentrum Heidelberg Germany Scientific Computing in Computer Science Technical University Munich Germany School of Computing Communication and Business Hochschule für Technik und Wirtschaft Berlin Germany Center for Bioinformatics Saar Saarland Informatics Campus Germany Institute for Modelling Hydraulic and Environmental Systems University of Stuttgart Germany Berlin Institute of Health Germany Scientific Computing Alfred Wegener Institute Helmholtz Center for Polar and Marine Research Bremerhaven Germany Max-Planck-Gesellschaft e.V. Institut für Theoretische Physik und Astrophysik Universität Würzburg Germany Institut für Computerphysik University of Stuttgart Germany University Library University of Stuttgart Germany Universität Bremen Germany Max Planck Institute of Molecular Cell Biology and Genetics Dresden Germany European Molecular Biology Laboratory Heidelb

research software has become a central asset in academic research. It optimizes existing and enables new research methods, implements and embeds research knowledge, and constitutes an essential research product in itself. research software must be sustainable in order to understand, replicate, reproduce, and build upon existing research or conduct new research effectively. In other words, software must be available, discoverable, usable, and adaptable to new needs, both now and in the future. research software therefore requires an environment that supports sustainability. Hence, a change is needed in the way research software development and maintenance are currently motivated, incentivized, funded, structurally and infrastructurally supported, and legally treated. Failing to do so will threaten the quality and validity of research. In this paper, we identify challenges for research software sustainability in Germany and beyond, in terms of motivation, selection, research software engineering personnel, funding, infrastructure, and legal aspects. Besides researchers, we specifically address political and academic decision-makers to increase awareness of the importance and needs of sustainable research software practices. In particular, we recommend strategies and measures to create an environment for sustainable research software, with the ultimate goal to ensure that software-driven research is valid, reproducible and sustainable, and that software is recognized as a first class citizen in research. This paper is the outcome of two workshops run in Germany in 2019, at deRSE19 - the first International Conference of research Software Engineers in Germany - and a dedicated DFG-supported follow-up workshop in Berlin. Copyright © 2020, The Authors. All rights reserved.

关键词： Software design

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CP2K: An electronic structure and molecular dynamics software package quickstep: Efficient and accurate electronic structure calculations

arXiv

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arXiv 2020年

作者： Kühne, Thomas D. Iannuzzi, Marcella Ben, Mauro Del Rybkin, Vladimir V. Seewald, Patrick Stein, Frederick Laino, Teodoro Khaliullin, Rustam Z. Schütt, Ole Schiffmann, Florian Golze, Dorothea Wilhelm, Jan Chulkov, Sergey Bani-Hashemian, Mohammad Hossein Weber, Valéry Borštnik, Urban Taillefumier, Mathieu Jakobovits, Alice Shoshana Lazzaro, Alfio Pabst, Hans Müller, Tiziano Schade, Robert Guidon, Manuel Andermatt, Samuel Holmberg, Nico Schenter, Gregory K. Hehn, Anna Bussy, Augustin Belleflamme, Fabian Tabacchi, Gloria Glöß, Andreas Lass, Michael Bethune, Iain Mundy, Christopher J. Plessl, Christian Watkins, Matt VandeVondele, Joost Krack, Matthias Hutter, Jürg Dynamics of Condensed Matter and Center for Sustainable Systems Design Chair of Theoretical Chemistry Paderborn University Warburger Str. 100 PaderbornD-33098 Germany Department of Chemistry University of Zurich Winterthurerstrasse 190 ZürichCH-8057 Switzerland Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States IBM Research - Zurich Säumerstrasse 4 RüschlikonCH-8803 Switzerland Department of Chemistry McGill University CH-801 Sherbrooke St. West MontrealQCH3A 0B8 Canada Department of Materials ETH Zürich ZürichCH-8092 Switzerland Centre of Policy Studies Victoria University Melbourne Australia Department of Applied Physics Aalto University Otakaari 1 EspooFI-02150 Finland Institute of Theoretical Physics University of Regensburg Universitätsstraße 31 RegensburgD-93053 Germany School of Mathematics and Physics University of Lincoln Brayford Pool Lincoln United Kingdom Integrated Systems Laboratory ETH Zürich ZürichCH-8092 Switzerland Scientific IT Services ETH Zürich Zürich Switzerland ETH Zürich HPE Switzerland GmbH Basel Switzerland Intel Extreme Computing Software and Systems Zürich Switzerland Department of Computer Science and Paderborn Center for Parallel Computing Paderborn University Warburger Str. 100 PaderbornD-33098 Germany Department of Chemistry and Materials Science Aalto University P.O. Box 16100 Aalto00076 Finland Physical Science Division Pacific Northwest National Laboratory P. O. Box 999 RichlandWA99352 United States Department of Science and High Technology University of Insubria INSTM via Valleggio 9 ComoI-22100 Italy BASF SE Carl-Bosch-Straße 38 Ludwigshafen am RheinD-67056 Germany Hartree Centre Science and Technology Facilities Council United Kingdom Laboratory for Scientific Computing and Modelling Paul Scherrer Institute Villigen PSICH-5232 Switzerland

CP2K is an open source electronic structure and molecular dynamics software package to perform atomistic simulations of solid-state, liquid, molecular and biological systems. It is especially aimed at massively-parallel and linear-scaling electronic structure methods and state-of-the-art ab-initio molecular dynamics simulations. Excellent performance for electronic structure calculations is achieved using novel algorithms implemented for modern high-performance computing systems. This review revisits the main capabilities of CP2K to perform efficient and accurate electronic structure simulations. The emphasis is put on density functional theory and multiple post-Hartree-Fock methods using the Gaussian and plane wave approach and its augmented all-electron extension. Copyright © 2020, The Authors. All rights reserved.

关键词： Electronic structure

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Reply to Baba and Kanamori

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Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2020年第5期71卷 1353-1355页

作者： Eelco Franz Ovidiu Rotariu Bruno S Lopes James L Bono Chad Laing Victor Gannon Angela H A M Van Hoek Ingrid Friesema Nigel P French Tessy George Patrick J Biggs Patricia Jaros Marta Rivas Isabel Chinen Josefina Campos Glen E Mellor P Scott Chandry Francisco Perez-Reche Ken J Forbes Norval Jc Strachan National Institute for Public Health and the Environment Centre for Infectious Disease Control Bilthoven The Netherlands. School of Biological Sciences University of Aberdeen Aberdeen Scotland United Kingdom. School of Medicine Medical Sciences & Nutrition University of Aberdeen Foresterhill Aberdeen Scotland United Kingdom. United States (US) Department of Agriculture Agricultural Research Service US Meat Animal Research Center Clay Center Nebraska USA. National Centre for Animal Diseases Canadian Food Inspection Agency Lethbridge Alberta Canada. National Microbiology Laboratory Public Health Agency of Canada Lethbridge Alberta Canada. mEpiLab Infectious Disease Research Centre School of Veterinary Science Massey University Palmerston North New Zealand. Instituto Nacional de Enfermedades Infecciosas Administracion Nacional del Laboratorios et Institutos de Salud "Dr. Carlos G. Malbrán" Ciudad Autónoma de Buenos Aires Buenos Aires Argentina. The Commonwealth Scientific and Industrial Research Organisation Agriculture and Food Werribee Australia. Institute of Complex Systems and Mathematical Biology Scottish Universities Physics Alliance School of Natural and Computing Sciences University of Aberdeen Aberdeen Scotland United Kingdom.

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Surrogate model of hybridized numerical relativity binary black hole waveforms

arXiv

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arXiv 2018年

作者： Varma, Vijay Field, Scott E. Scheel, Mark A. Blackman, Jonathan Kidder, Lawrence E. Pfeiffer, Harald P. Theoretical Astrophysics California Institute of Technology PasadenaCA91125 United States Department of Mathematics Center for Scientific Computing and Visualization Research University of Massachusetts DartmouthMA02747 United States Center for Radiophysics and Space Research Cornell University IthacaNY14853 United States Am Mühlenberg 1 Potsdam14476 Germany

Numerical relativity (NR) simulations provide the most accurate binary black hole gravitational waveforms, but are prohibitively expensive for applications such as parameter estimation. Surrogate models of NR waveforms have been shown to be both fast and accurate. However, NR-based surrogate models are limited by the training waveforms’ length, which is typically about 20 orbits before merger. We remedy this by hybridizing the NR waveforms using both post-Newtonian and effective one body waveforms for the early inspiral. We present NRHybSur3dq8, a surrogate model for hybridized nonprecessing numerical relativity waveforms, that is valid for the entire LIGO band (starting at 20 Hz) for stellar mass binaries with total masses as low as 2.25 M. We include the ` ≤ 4 and (5, 5) spin-weighted spherical harmonic modes but not the (4, 1) or (4, 0) modes. This model has been trained against hybridized waveforms based on 104 NR waveforms with mass ratios q ≤ 8, and |χ1z|, |χ2z| ≤ 0.8, where χ1z (χ2z) is the spin of the heavier (lighter) BH in the direction of orbital angular momentum. The surrogate reproduces the hybrid waveforms accurately, with mismatches . 3 ×10−4 over the mass range 2.25M ≤ M ≤ 300M. At high masses (M & 40M), where the merger and ringdown are more prominent, we show roughly two orders of magnitude improvement over existing waveform models. We also show that the surrogate works well even when extrapolated outside its training parameter space range, including at spins as large as 0.998. Finally, we show that this model accurately reproduces the spheroidal-spherical mode mixing present in the NR ringdown signal. Copyright © 2018, The Authors. All rights reserved.

关键词： Merging

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Sharp transitions in rotating turbulent convection: Lagrangian acceleration statistics reveal a second critical Rossby number

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Physical Review Fluids 2019年第7期4卷 074601-074601页

作者： Kim M. J. Alards Rudie P. J. Kunnen Richard J. A. M. Stevens Detlef Lohse Federico Toschi Herman J. H. Clercx Fluid Dynamics Laboratory and J.M. Burgers Center for Fluid Dynamics Department of Applied Physics Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Physics of Fluids Group Max Planck Center for Complex Fluid Dynamics J.M. Burgers Center for Fluid Dynamics and MESA+ Research Institute Department of Science and Technology University of Twente P.O. Box 217 7500 AE Enschede The Netherlands Max Planck Institute for Dynamics and Self-Organization Am Fassberg 17 37077 Göttingen Germany Centre of Analysis Scientific Computing and Applications W&I Department of Mathematics and Computer Science Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Istituto per le Applicazioni del Calcolo Consiglio Nazionale delle Ricerche Via dei Taurini 19 00185 Rome Italy

In Rayleigh–Bénard convection (RBC) for fluids with Prandtl number Pr≳1, rotation beyond a critical (small) rotation rate is known to cause a sudden enhancement of heat transfer, which can be explained by a change in the character of the boundary layer (BL) dynamics near the top and bottom plates of the convection cell. Namely, with increasing rotation rate, the BL signature suddenly changes from Prandtl–Blasius type to Ekman type. The transition from a constant heat transfer to an almost linearly increasing heat transfer with increasing rotation rate is known to be sharp and the critical Rossby number Roc occurs typically in the range 2.3≲Roc≲2.9 (for Rayleigh number Ra=1.3×109, Pr=6.7, and a convection cell with aspect ratio Γ=DH=1, with D the diameter and H the height of the cell). The explanation of the sharp transition in the heat transfer points to the change in the dominant flow structure. At 1/Ro≲1/Roc (slow rotation), the well-known large-scale circulation (LSC) is found: a single domain-filling convection roll made up of many individual thermal plumes. At 1/Ro≳1/Roc (rapid rotation), the LSC vanishes and is replaced with a collection of swirling plumes that align with the rotation axis. In this paper, by numerically studying Lagrangian acceleration statistics, related to the small-scale properties of the flow structures, we reveal that this transition between these different dominant flow structures happens at a second critical Rossby number, Roc2≈2.25 (different from Roc1≈2.7 for the sharp transition in the Nusselt number Nu; both values for the parameter settings of our present numerical study). When statistical data of Lagrangian tracers near the top plate are collected, it is found that the root-mean-square values and the kurtosis of the horizontal acceleration of these tracers show a sudden increase at Roc2. To better understand the nature of this transition we compute joint statistics of the Lagrangian velocity and acceleration of fluid particles and

关键词： Rayleigh-Bénard convection Turbulence Lagrangian particle tracking

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Publisher Correction: Tig1 regulates proximo-distal identity during salamander limb regeneration

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Nature communications 2022年第1期13卷 4507页

作者： Catarina R Oliveira Dunja Knapp Ahmed Elewa Tobias Gerber Sandra G Gonzalez Malagon Phillip B Gates Hannah E Walters Andreas Petzold Hernan Arce Rodrigo C Cordoba Elaiyaraja Subramanian Osvaldo Chara Elly M Tanaka András Simon Maximina H Yun Technische Universität Dresden CRTD/Center for Regenerative Therapies Dresden Dresden Germany. Technische Universität Dresden CRTD/Center for Regenerative Therapies Dresden Dresden Germany. dunja.knapp@tu-dresden.de. Department of Cell and Molecular Biology Karolinska Institute Stockholm Sweden. European Molecular Biology Laboratory (EMBL) Heidelberg Germany. Institute of Structural and Molecular Biology University College London London UK. Biomedical Research Institute Foundation for Research and Technology University of Ioannina Campus 45115 Ioannina Greece. Systems Biology Group Institute of Physics of Liquids and Biological Systems National Scientific and Technical Research Council (CONICET) and University of La Plata La Plata Argentina. Instituto de Tecnología Universidad Argentina de la Empresa (UADE) Buenos Aires Argentina. Technische Universität Dresden Center for Information Services and High Performance Computing ZIH Dresden Germany. Institute of Molecular Pathology Vienna Biocenter Vienna Austria. Technische Universität Dresden CRTD/Center for Regenerative Therapies Dresden Dresden Germany. maximina.yun@tu-dresden.de. Max Planck Institute for Molecular Cell Biology and Genetics Dresden Germany. maximina.yun@tu-dresden.de.

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Progress in multibaryon spectroscopy 36

Progress in multibaryon spectroscopy

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36th Annual International Symposium on Lattice Field Theory, LATTICE 2018

作者： Berkowitz, Evan Brantley, David McElvain, Kenneth Walker-Loud, André Chang, Chia Cheng Clark, M.A. Kurth, Thorsten Joó, Bálint Monge-Camacho, Henry Nicholson, Amy Rinaldi, Enrico Vranas, Pavlos Institut für Kernphysik Institute for Advanced Simulation Forschungszentrum Jülich Germany Nuclear Science Division Lawrence Berkeley National Laboratory United States RIKEN Japan NVIDIA Corporation United States National Energy Research Scientific Computing Center Lawrence Berkeley National Laboratory United States Jefferson Lab United States Department of Physics and Astronomy University of North Carolina United States RIKEN BNL Research Center United States Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory United States

Anchoring the nuclear interaction in QCD is a long-outstanding problem in nuclear physics. While the lattice community has made enormous progress in mesonic physics and single nucleon physics, continuum-limit physical-point multi-nucleon physics has remained out of reach. I will review CalLat’s strategy for multi-nucleon spectroscopy and our latest results. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Spectroscopy

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Testing the "no-hair" nature of binary black holes using the consistency of multipolar gravitational radiation

arXiv

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arXiv 2019年

作者： Islam, Tousif Mehta, Ajit Kumar Ghosh, Abhirup Varma, Vijay Ajith, Parameswaran Sathyaprakash, B.S. International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bangalore560089 India Center for Scientific Computation and Visualization Research University of Massachusetts Dartmouth DartmouthMA02740 United States Potsdam-GolmD-14476 Germany Theoretical Astrophysics 350-17 California Institute of Technology PasadenaCA91125 United States Canadian Institute for Advanced Research CIFAR Azrieli Global Scholar MaRS Centre West Tower 661 University Ave. Suite 505 TorontoONM5G 1M1 Canada Department of Physics Department of Astronomy and Astrophysics Pennsylvania State University University ParkPA16802 United States School of Physics and Astronomy Cardiff University CardiffCF24 3AA United Kingdom

Gravitational-wave (GW) observations of binary black holes offer the best probes of the relativistic, strong-field regime of gravity. Gravitational radiation, in the leading order is quadrupolar. However, non-quadrupole (higher order) modes make appreciable contribution to the radiation from binary black holes with large mass ratios and misaligned spins. The multipolar structure of the radiation is fully determined by the intrinsic parameters (masses and spin angular momenta of the companion black holes) of a binary in quasi-circular orbit. Following our previous work [1], we develop multiple ways of testing the consistency of the observed GW signal with the expected multipolar structure of radiation from binary black holes in general relativity. We call this a "no-hair" test of binary black holes as this is similar to testing the "no-hair" theorem for isolated black holes through mutual consistency of the quasi-normal mode spectrum. We use Bayesian inference to on simulated GW signals that are consistent/inconsistent with binary black holes in GR to demonstrate the power of the proposed tests. We also make estimate systematic errors arising as a result of neglecting companion spins. Copyright © 2019, The Authors. All rights reserved.

关键词： Stars

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