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Generic inspirals and mergers of binary black holes produce beamed emissionof gravitational radiation that can lead to a gravitational recoil or kick ofthe final black hole. The kick velocity depends on the mass ratio and spins ofthe binary as well as on the dynamics of the binary configuration. Studies havefocused so far on the most astrophysically relevant configuration ofquasi-circular inspirals, for which kicks as large as 3,300 km/s have beenfound. We present the first study of gravitational recoil in hyperbolicencounters. Contrary to quasi-circular configurations, in which the beamedradiation tends to average during the inspiral, radiation from hyperbolicencounters is plunge dominated, resulting in an enhancement of preferentialbeaming. As a consequence, it is possible to achieve kick velocities as largeas 10,000 km/s.

Superkicks in Hyperbolic Encounters of Binary Black Holes