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  Anatomy of the binary black hole recoil: A multipolar analysis

Schnittman, J. D., Buonanno, A., van Meter, J. R., Baker, J. G., Boggs, W. D., Centrella, J., et al. (2008). Anatomy of the binary black hole recoil: A multipolar analysis. Physical Review D, 77: 044031. doi:10.1103/PhysRevD.77.044031.

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Schnittman, Jeremy D., Author
Buonanno, Alessandra1, 2, Author           
van Meter, James R., Author
Baker, John G., Author
Boggs, William D., Author
Centrella, Joan, Author
Kelly, Bernard J., Author
McWilliams, Sean T., Author
Affiliations:
1Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, ou_persistent22              
2Astrophysical 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,Astrophysics, astro-ph
 Abstract: We present a multipolar analysis of the gravitational recoil computed in recent numerical simulations of binary black hole (BH) coalescence, for both unequal masses and non-zero, non-precessing spins. We show that multipole moments up to and including l=4 are sufficient to accurately reproduce the final recoil velocity (within ~2%) and that only a few dominant modes contribute significantly to it (within ~5%). We describe how the relative amplitudes, and more importantly, the relative phases, of these few modes control the way in which the recoil builds up throughout the inspiral, merger, and ringdown phases. We also find that the numerical results can be reproduced by an ``effective Newtonian'' formula for the multipole moments obtained by replacing the radial separation in the Newtonian formulae with an effective radius computed from the numerical data. Beyond the merger, the numerical results are reproduced by a superposition of three Kerr quasi-normal modes (QNMs). Analytic formulae, obtained by expressing the multipole moments in terms of the fundamental QNMs of a Kerr BH, are able to explain the onset and amount of ``anti-kick'' for each of the simulations. Lastly, we apply this multipolar analysis to help explain the remarkable difference between the amplitudes of planar and non-planar kicks for equal-mass spinning black holes.

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 Dates: 2007-07-022007-12-202008
 Publication Status: Issued
 Pages: 28 pages, 20 figures, submitted to PRD; v2: minor revisions from referee report
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 77 Sequence Number: 044031 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258