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  Gravitational waveforms for high spin and high mass-ratio binary black holes: A synergistic use of numerical-relativity codes

Hinder, I., Ossokine, S., Pfeiffer, H., & Buonanno, A. (2019). Gravitational waveforms for high spin and high mass-ratio binary black holes: A synergistic use of numerical-relativity codes. Physical Review D, 99 (6): 061501. doi:10.1103/PhysRevD.99.061501.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-74EF-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-4D69-2
Genre: Journal Article

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 Creators:
Hinder, Ian1, Author              
Ossokine, Serguei1, Author              
Pfeiffer, Harald1, Author              
Buonanno, Alessandra1, Author              
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1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: Observation and characterisation of gravitational waves from binary black holes requires accurate knowledge of the expected waveforms. The late inspiral and merger phase of the waveform is obtained through direct numerical integration of the full 3-dimensional Einstein equations. The Spectral Einstein Code (SpEC) utilizes a multi-domain pseudo-spectral method tightly adapted to the geometry of the black holes; it is computationally efficient and accurate, but--for high mass-ratios and large spins--sometimes requires manual fine-tuning for the merger-phase of binaries. The Einstein Toolkit (ET) employs finite difference methods and the moving puncture technique; it is less computationally efficient, but highly robust. For some mergers with high mass ratio and large spins, the efficient numerical algorithms used in SpEC have failed, whereas the simpler algorithms used in the ET were successful. Given the urgent need of testing the accuracy of waveform models currently used in LIGO and Virgo inference analyses for high mass ratios and spins, we present here a synergistic approach to numerical-relativity: We combine SpEC and ET waveforms into complete inspiral-merger-ringdown waveforms, taking advantage of the computational efficiency of the pseudo-spectral code during the inspiral, and the robustness of the finite-difference code at the merger. We validate our method against a case where complete waveforms from both codes are available, compute three new hybrid numerical-relativity waveforms, and compare them with analytical waveform models currently used in LIGO and Virgo science. All the waveforms and the hybridization code are publicly available.

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 Dates: 2018-10-242019
 Publication Status: Published in print
 Pages: 7 pages, 4 figures
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 Identifiers: arXiv: 1810.10585
URI: http://arxiv.org/abs/1810.10585
DOI: 10.1103/PhysRevD.99.061501
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Title: Physical Review D
Source Genre: Journal
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Pages: - Volume / Issue: 99 (6) Sequence Number: 061501 Start / End Page: - Identifier: -