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  • 1
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    GRAVITATIONAL WAVE EXTRACTION FROM AN INSPIRALING CONFIGURATION OF MERGING BLACK HOLES (2005)
    In:  CASI
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    Publication Date: 2018-06-06
    Description: We present new techniques for evolving binary black hole systems which allow the accurate determination of gravitational waveforms directly from the wave zone region of the numerical simulations. Rather than excising the black hole interiors, our approach follows the "puncture" treatment of black holes, but utilizing a new gauge condition which allows the black holes to move successfully through the computational domain. We apply these techniques to an inspiraling binary, modeling the radiation generated during the final plunge and ringdown. We demonstrate convergence of the waveforms and and good conservation of mass-energy, with just over 3% of the system s mass converted to gravitational radiation.
    Keywords: Astrophysics
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  • 2
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    Merging Black Holes (2010)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: Black-hole mergers take place in regions of very strong and dynamical gravitational fields, and are among the strongest sources of gravitational radiation. Probing these mergers requires solving the full set of Einstein's equations of general relativity numerically. For more than 40 years, progress towards this goal has been very slow, as numerical relativists encountered a host of difficult problems. Recently, several breakthroughs have led to dramatic progress, enabling stable and accurate calculations of black-hole mergers. This article presents an overview of this field, including impacts on astrophysics and applications in gravitational wave data analysis.
    Keywords: Astrophysics
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  • 3
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    Black-Hole Binaries, Gravitational Waves, and Numerical Relativity (2010)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: Understanding the predictions of general relativity for the dynamical interactions of two black holes has been a long-standing unsolved problem in theoretical physics. Black-hole mergers are monumental astrophysical events ' releasing tremendous amounts of energy in the form of gravitational radiation ' and are key sources for both ground- and spacebased gravitational wave detectors. The black-hole merger dynamics and the resulting gravitational waveforms can only he calculated through numerical simulations of Einstein's equations of general relativity. For many years, numerical relativists attempting to model these mergers encountered a host of problems, causing their codes to crash after just a fraction of a binary orbit cnuld be simulated. Recently ' however, a series of dramatic advances in numerical relativity has ' for the first time, allowed stable / robust black hole merger simulations. We chronicle this remarkable progress in the rapidly maturing field of numerical relativity, and the new understanding of black-hole binary dynamics that is emerging. We also discuss important applications of these fundamental physics results to astrophysics, to gravitationalwave astronomy, and in other areas.
    Keywords: Astrophysics
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  • 4
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    Developments in IRS Multi-Mode Waveforms (2013)
    In:  CASI
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    Publication Date: 2019-07-13
    Description: Developments in IRS (Implicit Rotating Source) multi-mode waveforms modeling.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN8779 , American Physical Society (APS) April Meeting 2013; Apr 13, 2013 - Apr 16, 2013; Denver, CO; United States
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  • 5
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    Test of a General Formula for Black Hole Gravitational Wave Kicks (2010)
    In:  CASI
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    Publication Date: 2019-07-13
    Description: Although the gravitational wave kick velocity in the orbital plane of coalescing black holes has been understood for some time, apparently conflicting formulae have been proposed for the dominant outof- plane kick, each a good fit to different data sets. This is important to resolve because it is only the out-of-plane kicks that can reach more than 500 km s-l and can thus eject merged remnants from galaxies. Using a different ansatz for the out-of-plane kick, we show that we can fit almost all existing data to better than 5%. This is good enough for any astrophysical calculation and shows that the previous apparent conflict was only because the two data sets explored different aspects of the kick parameter space.
    Keywords: Astrophysics
    Type: GSFC.JA.5187.2011 , The Astrophysical Journal (ISSN 1538-4357); 719; 2; 1427-1432
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  • 6
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    Decoding Mode-mixing in Black-hole Merger Ringdown (2013)
    In:  CASI
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    Publication Date: 2019-07-12
    Description: Optimal extraction of information from gravitational-wave observations of binary black-hole coalescences requires detailed knowledge of the waveforms. Current approaches for representing waveform information are based on spin-weighted spherical harmonic decomposition. Higher-order harmonic modes carrying a few percent of the total power output near merger can supply information critical to determining intrinsic and extrinsic parameters of the binary. One obstacle to constructing a full multi-mode template of merger waveforms is the apparently complicated behavior of some of these modes; instead of settling down to a simple quasinormal frequency with decaying amplitude, some |m| = modes show periodic bumps characteristic of mode-mixing. We analyze the strongest of these modes the anomalous (3, 2) harmonic mode measured in a set of binary black-hole merger waveform simulations, and show that to leading order, they are due to a mismatch between the spherical harmonic basis used for extraction in 3D numerical relativity simulations, and the spheroidal harmonics adapted to the perturbation theory of Kerr black holes. Other causes of mode-mixing arising from gauge ambiguities and physical properties of the quasinormal ringdown modes are also considered and found to be small for the waveforms studied here.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN7186
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  • 7
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    The Final Merger of Black-Hole Binaries (2010)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: Recent breakthroughs in the field of numerical relativity have led to dramatic progress in understanding the predictions of General Relativity for the dynamical interactions of two black holes in the regime of very strong gravitational fields. Such black-hole binaries are important astrophysical systems and are a key target of current and developing gravitational-wave detectors. The waveform signature of strong gravitational radiation emitted as the black holes fall together and merge provides a clear observable record of the process. After decades of slow progress / these mergers and the gravitational-wave signals they generate can now be routinely calculated using the methods of numerical relativity. We review recent advances in understanding the predicted physics of events and the consequent radiation, and discuss some of the impacts this new knowledge is having in various areas of astrophysics
    Keywords: Astrophysics
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  • 8
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    Numerical Relativity (2009)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: Recent advances in numerical relativity have fueled an explosion of progress in understanding the predictions of Einstein's theory of gravity, General Relativity, for the strong field dynamics, the gravitational radiation wave forms, and consequently the state of the remnant produced from the merger of compact binary objects. I will review recent results from the field, focusing on mergers of two black holes.
    Keywords: Astrophysics
    Type: SLAC Summer Institute: Revolutions on the Horizon, A Decade of New Experiments; Aug 06, 2009 - Aug 08, 2009; Menlo, CA; United States
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  • 9
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    Black-hole Merger Simulations for LISA Science (2009)
    In:  Other Sources
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    Publication Date: 2019-07-19
    Description: The strongest expected sources of gravitational waves in the LISA band are the mergers of massive black holes. LISA may observe these systems to high redshift, z〉10, to uncover details of the origin of massive black holes, and of the relationship between black holes and their host structures, and structure formation itself. These signals arise from the final stage in the development of a massive black-hole binary emitting strong gravitational radiation that accelerates the system's inspiral toward merger. The strongest part of the signal, at the point of merger, carries much information about the system and provides a probe of extreme gravitational physics. Theoretical predictions for these merger signals rely on supercomputer simulations to solve Einstein's equations. We discuss recent numerical results and their impact on LISA science expectations.
    Keywords: Astrophysics
    Type: Black-hole Merger Simulations for LISA Science; Jan 01, 2010; Washington, DC; United States
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  • 10
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    Testing Gravitational Physics with Space-based Gravitational-wave Observations (2011)
    In:  CASI
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    Publication Date: 2019-07-19
    Description: Gravitational wave observations provide exceptional and unique opportunities for precision tests of gravitational physics, as predicted by general relativity (GR). Space-based gravitational wave measurements, with high signal-to-noise ratios and large numbers of observed events may provide the best-suited gravitational-wave observations for testing GR with unprecedented precision. These observations will be especially useful in testing the properties of gravitational waves and strong-field aspects of the theory which are less relevant in other observations. We review the proposed GR test based on observations of massive black hole mergers, extreme mass ratio inspirals, and galactic binary systems.
    Keywords: Astrophysics
    Type: GSFC.ABS.5948.2012 , Workshop for Gravitational-Wave Mission Architectural Concepts/Maritime Institute; Dec 20, 2011 - Dec 21, 2011; Linthicum, MD; United States
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