Estimating the final spin of a binary black hole coalescence

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dc.creatorBuonanno, Alessandra
dc.creatorKidder, Lawrence E.
dc.creatorLehner, Luis
dc.date2007-09-24
dc.date.accessioned2026-07-07T12:13:45Z
dc.date.available2026-07-07T12:13:45Z
dc.descriptionWe present a straightforward approach for estimating the final black hole spin of a binary black hole coalescence with arbitrary initial masses and spins. Making some simple assumptions, we estimate the final angular momentum to be the sum of the individual spins plus the orbital angular momentum of a test particle orbiting at the last stable orbit around a Kerr black hole with a spin parameter of the final black hole. The formula we obtain is able to reproduce with reasonable accuracy the results from available numerical simulations, but, more importantly, it can be used to investigate what configurations might give rise to interesting dynamics. In particular, we discuss scenarios which might give rise to a ``flip'' in the direction of the total angular momentum of the system. By studying the dependence of the final spin upon the mass ratio and initial spins we find that our simple approach suggests that it is not possible to spin-up a black hole to extremal values through merger scenarios irrespective of the mass ratio of the objects involved.
dc.description9 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/0709.3839
dc.identifierhttp://arxiv.org/abs/0709.3839
dc.identifierPhys.Rev.D77:026004,2008
dc.identifierdoi:10.1103/PhysRevD.77.026004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/210958
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleEstimating the final spin of a binary black hole coalescence
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