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Grazing collisions of black holes via the excision of singularities. (English) Zbl 1369.83038

Summary: We present the first simulations of non-head-on (grazing) collisions of binary black holes in which the singularities are excised from the simulation. Initially equal mass \(m\) black holes (spinning or not) are separated by \(\approx 10m\) and with impact parameter \(\approx 2m\). Evolutions to \(t\approx 35m\) are obtained where two separate horizons are present for \(t\approx 3.8m\); then a single enveloping horizon forms indicating that the holes merged. Apparent horizon area estimates suggest gravitational radiation of about \(2\%\)–\(3\%\) of the total mass. The evolutions end after a moderate amount of time because of instabilities.

MSC:

83C57 Black holes
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