Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Potsdam, Germany.
Phys Rev Lett. 2010 Jun 4;104(22):221101. doi: 10.1103/PhysRevLett.104.221101. Epub 2010 Jun 3.
The generation of a large recoil velocity from the inspiral and merger of binary black holes represents one of the most exciting results of numerical-relativity calculations. While many aspects of this process have been investigated and explained, the "antikick," namely, the sudden deceleration after the merger, has not yet found a simple explanation. We show that the antikick can be understood in terms of the radiation from a deformed black hole where the anisotropic curvature distribution on the horizon correlates with the direction and intensity of the recoil. Our analysis is focused on Robinson-Trautman spacetimes and allows us to measure both the energies and momenta radiated in a gauge-invariant manner. At the same time, this simpler setup provides the qualitative and quantitative features of merging black holes, opening the way to a deeper understanding of the nonlinear dynamics of black-hole spacetimes.
二进制黑洞的并合过程中产生的大反冲速度是数值相对论计算中最令人兴奋的结果之一。虽然这个过程的许多方面已经被研究和解释过，但“反冲刹车”（antikick），即在合并后突然减速，仍然没有找到一个简单的解释。我们表明，反冲刹车可以用变形黑洞的辐射来理解，其中视界上的各向异性曲率分布与反冲的方向和强度相关。我们的分析集中在罗宾逊-特劳特曼时空中，并允许我们以规范不变的方式测量辐射的能量和动量。同时，这种更简单的设置提供了合并黑洞的定性和定量特征，为更深入地理解黑洞时空的非线性动力学开辟了道路。
