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Authors: Masaru Shibata, Hirotada Okawa, Tetsuro Yamamoto

Date: 27 Oct 2008

Abstract: We study nonaxisymmetric collision of two black holes (BHs) with a high velocity $v=|dxˆi/dxˆ0|=0.6$--$0.9c$ at infinity, where $xˆ{\mu}$ denotes four-dimensional coordinates. We prepare two boosted BHs for the initial condition which is different from that computed by a simple moving-puncture approach. By extrapolation of the numerical results, we find that the impact parameter has to be smaller that $\approx 2.5GM_0/cˆ2$ for formation of a BH in the collision for $v \to c$, where $M_0 cˆ2$ is the initial total ADM mass energy of the system. For the critical value of the impact parameter, 20--30% of mass energy and 60--70% of angular momentum are dissipated by gravitational radiation for $v=0.6$--$0.9c$.

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