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Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios

Radia, Miren and Sperhake, Ulrich and Berti, Emanuele and Croft, Robin (2021) Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios. Physical Review D, 103 (10). Art. No. 104006. ISSN 2470-0010. doi:10.1103/physrevd.103.104006.

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The radiation of linear momentum imparts a recoil (or “kick”) to the center of mass of a merging black-hole binary system. Recent numerical relativity calculations have shown that eccentricity can lead to an approximate 25% increase in recoil velocities for equal-mass, spinning binaries with spins lying in the orbital plane (“superkick” configurations) [U. Sperhake et al. Phys. Rev. D 101, 024044 (2020)]. Here we investigate the impact of nonzero eccentricity on the kick magnitude and gravitational-wave emission of nonspinning, unequal-mass black hole binaries. We confirm that nonzero eccentricities at merger can lead to kicks which are larger by up to ∼25% relative to the quasicircular case. We also find that the kick velocity v has an oscillatory dependence on eccentricity, which we interpret as a consequence of changes in the angle between the infall direction at merger and the apoapsis (or periapsis) direction.

Item Type:Article
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URLURL TypeDescription Paper
Radia, Miren0000-0001-8861-2025
Sperhake, Ulrich0000-0002-3134-7088
Berti, Emanuele0000-0003-0751-5130
Croft, Robin0000-0002-1236-6566
Additional Information:© 2021 American Physical Society. Received 28 January 2021; accepted 18 March 2021; published 6 May 2021. We thank Michalis Agathos, Vishal Baibhav, Vitor Cardoso, Thomas Helfer, and Nicholas Speeney for useful discussions. We also thank Chris Moore, Carlos Lousto, and Juan Calderón Bustillo for helpful comments on this manuscript. M. R. thanks the GRChombo collaboration [61] for their code development, and particularly Katy Clough and Tiago França. M. R. is supported by a Science and Technology Facilities Council (STFC) studentship. U.S. is supported by the European Union’s H2020 ERC Consolidator Grant “Matter and strong-field gravity: new frontiers in Einstein’s theory” Grant No. MaGRaTh–646597, and the STFC Consolidator Grant No. ST/P000673/1. E. B. is supported by NSF Grant No. PHY-1912550, NSF Grant No. AST-2006538, NASA ATP Grant No. 17-ATP17-0225, and NASA ATP Grant No. 19-ATP19-0051. This work has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant No. 690904. This work was supported by the GWverse COST Action CA16104, “Black holes, gravitational waves and fundamental physics.” Computational work was performed on the San Diego Supercomputer Center Comet and Texas Advanced Computing Center (TACC) Stampede2 clusters at the University of California San Diego and the University of Texas at Austin (UT Austin), respectively, through NSF-XSEDE Grant No. PHY-090003; the Cambridge Service for Data Driven Discovery (CSD3) system at the University of Cambridge through STFC capital Grants No. ST/P002307/1 and No. ST/R002452/1, and STFC operations Grant No. ST/R00689X/1; the TACC Frontera cluster at UT Austin; and the JUWELS cluster at GCS@FZJ, Germany through PRACE Grant No. 2020225359.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/P000673/1
European Research Council (ERC)646597
Marie Curie Fellowship690904
European Cooperation in Science and Technology (COST)CA16104
Science and Technology Facilities Council (STFC)ST/P002307/1
Science and Technology Facilities Council (STFC)ST/R002452/1
Science and Technology Facilities Council (STFC)ST/R00689X/1
Partnership for Advanced Computing in Europe (PRACE)2020225359
Issue or Number:10
Record Number:CaltechAUTHORS:20210513-121344202
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109116
Deposited By: Tony Diaz
Deposited On:13 May 2021 19:46
Last Modified:13 May 2021 19:46

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