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- W2034244334 abstract "We study ultrarelativistic encounters of two spinning, equal-mass black holes through simulations in full numerical relativity. Two initial data sequences are studied in detail: one that leads to scattering and one that leads to a grazing collision and merger. In all cases, the initial black hole spins lie in the orbital plane, a configuration that leads to the so-called superkicks. In astrophysical, quasicircular inspirals, such kicks can be as large as $ensuremath{sim}3000text{ }text{ }mathrm{km}/mathrm{s}$; here, we find configurations that exceed $ensuremath{sim}15text{ }000text{ }text{ }mathrm{km}/mathrm{s}$. We find that the maximum recoil is to a good approximation proportional to the total amount of energy radiated in gravitational waves, but largely independent of whether a merger occurs or not. This shows that the mechanism predominantly responsible for the superkick is not related to merger dynamics. Rather, a consistent explanation is that the ``bobbing'' motion of the orbit causes an asymmetric beaming of the radiation produced by the in-plane orbital motion of the binary, and the net asymmetry is balanced by a recoil. We use our results to formulate some conjectures on the ultimate kick achievable in any black hole encounter." @default.
- W2034244334 created "2016-06-24" @default.
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- W2034244334 date "2011-01-28" @default.
- W2034244334 modified "2023-10-15" @default.
- W2034244334 title "Superkicks in ultrarelativistic encounters of spinning black holes" @default.
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- W2034244334 doi "https://doi.org/10.1103/physrevd.83.024037" @default.
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