Superkicks in Hyperbolic Encounters of Binary Black Holes
Abstract
Generic inspirals and mergers of binary black holes produce beamed emission of gravitational radiation that can lead to a gravitational recoil or kick of the final black hole. The kick velocity depends on the mass ratio and spins of the binary as well as on the dynamics of the binary configuration. Studies have focused so far on the most astrophysically relevant configuration of quasicircular inspirals, for which kicks as large as ∼3300kms^{1} have been found. We present the first study of gravitational recoil in hyperbolic encounters. Contrary to quasicircular configurations, in which the beamed radiation tends to average during the inspiral, radiation from hyperbolic encounters is plunge dominated, resulting in an enhancement of preferential beaming. As a consequence, it is possible in highly relativistic scatterings to achieve kick velocities as large as 10000kms^{1}.
 Publication:

Physical Review Letters
 Pub Date:
 January 2009
 DOI:
 10.1103/PhysRevLett.102.041101
 arXiv:
 arXiv:0807.3292
 Bibcode:
 2009PhRvL.102d1101H
 Keywords:

 04.25.dg;
 04.30.Tv;
 04.70.Bw;
 97.60.Lf;
 Numerical studies of black holes and blackhole binaries;
 Gravitationalwave astrophysics;
 Classical black holes;
 Black holes;
 General Relativity and Quantum Cosmology;
 Astrophysics
 EPrint:
 4 pages, 5 figures, 1 table