Abstract
Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24,10129 Torino, Italy and INFN, sez. di Torino, Via P. Giuria 1, Torino, Italy(Dated: February 1, 2008)We update the analytical estimate of the final spin of a coalescing black-hole binary derivedwithin the Effective-One-Body (EOB) approach. We consider unequal-mass non-spinning black-hole binaries. It is found that a more complete account of relevant physical effects (higher post-Newtonian accuracy, ringdown losses) allows the analytical EOB estimate to “converge towards” therecently obtained numerical results within 2%. This agreement illustrates the ability of the EOBapproach to capture the essential physics of coalescing black-hole binaries. Our analytical approachallows one to estimate the final spin of the black hole formed by coalescing binaries in a mass range( ν = m
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