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arXiv 0706.2541gr-qcastro-ph
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二元黑洞:自旋动力学和引力反冲

Binary Black Holes: Spin Dynamics and Gravitational Recoil

Frank Herrmann, Ian Hinder, Deirdre M. Shoemaker, Pablo Laguna, Richard A. Matzner

摘要:

我们提出了一个研究的旋转黑洞双星集中在个别黑洞的自旋动力学以及引力反冲收购合并产生的黑洞。我们考虑两个系列的初始自旋取向远离双轨道平面。在其中一个系列中,自旋是反对齐的;对于第二个系列,其中一个自旋沿着分隔黑洞的线指向远离双星的方向。我们发现一个显着的协议之间的自旋动力学预测在第二后牛顿秩序和那些从数值相对论。对于每种配置,我们计算最终黑洞的反冲。我们使用反对齐自旋系列的反冲估计来拟合\KKF{,}中的参数,并验证了沿着轨道角动量方向的反冲是$\propto \sinθ$,并且在轨道平面$\propto \cosθ$上,其中$θ$是自旋方向和轨道角动量之间的角度。我们还发现,黑洞的自旋可以很好地估计,通过评估孤立视界自旋球的坐标半径恒定。

英文摘要:

We present a study of spinning black hole binaries focusing on the spin dynamics of the individual black holes as well as on the gravitational recoil acquired by the black hole produced by the merger. We consider two series of initial spin orientations away from the binary orbital plane. In one of the series, the spins are anti-aligned; for the second series, one of the spins points away from the binary along the line separating the black holes. We find a remarkable agreement between the spin dynamics predicted at 2nd post-Newtonian order and those from numerical relativity. For each configuration, we compute the kick of the final black hole. We use the kick estimates from the series with anti-aligned spins to fit the parameters in the \KKF{,} and verify that the recoil along the direction of the orbital angular momentum is $\propto \sinθ$ and on the orbital plane $\propto \cosθ$, with $θ$ the angle between the spin directions and the orbital angular momentum. We also find that the black hole spins can be well estimated by evaluating the isolated horizon spin on spheres of constant coordinate radius.

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