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Cross section, final spin, and zoom-whirl behavior in high-energy black-hole collisions

Sperhake U, Cardoso V, Pretorius F, Berti E, Hinderer T, Yunes N

Physical review letters, 2009

Abstract

We study the collision of two highly boosted equal-mass, nonrotating black holes with generic impact parameter. We find such systems to exhibit zoom-whirl behavior when fine-tuning the impact parameter. Near the threshold of immediate merger the remnant black-hole Kerr parameter can be near maximal (a/M greater, similar 0.95) and the radiated energy can be as large as 35 +/- 5% of the center-of-mass energy.

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