Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios
Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios
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DOI：
10.1103/physrevd.103.104006
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发表时间：
2021-01
影响因子：
5
通讯作者：
Miren Radia;U. Sperhake;E. Berti;R. Croft
中科院分区：
文献类型：
--
作者：
Miren Radia;U. Sperhake;E. Berti;R. Croft
线性动量的辐射会对合并中的黑洞双星系统的质心产生反冲（或“反冲”）。最近的数值相对论计算表明，对于自旋位于轨道平面内的等质量自旋双星（“超级反冲“配置），偏心率可导致反冲速度增加约25%[U Sperhake et al. Phys. Rev. D 101（2020）024044（arXiv：1910.01598）]。在这里，我们调查的非零偏心的非自旋，不等质量黑洞双星的反冲幅度和引力波发射的影响。我们证实，非零的偏心率在合并可能会导致更大的踢高达25%的准圆形的情况下。我们还发现，反冲速度$v$有一个振荡的偏心率的依赖关系，我们解释为合并时的下落方向和远心点（或近心点）方向之间的角度变化的结果。
The radiation of linear momentum imparts a recoil (or"kick") to the center of mass of a merging black hole binary system. Recent numerical relativity calculations have shown that eccentricity can lead to an approximate 25% increase in recoil velocities for equal-mass, spinning binaries with spins lying in the orbital plane ("superkick"configurations) [U Sperhake et al. Phys. Rev. D 101 (2020) 024044 (arXiv:1910.01598)]. Here we investigate the impact of nonzero eccentricity on the kick magnitude and gravitational-wave emission of nonspinning, unequal-mass black hole binaries. We confirm that nonzero eccentricities at merger can lead to kicks which are larger by up to ~25% relative to the quasicircular case. We also find that the kick velocity $v$ has an oscillatory dependence on eccentricity, that we interpret as a consequence of changes in the angle between the infall direction at merger and the apoapsis (or periapsis) direction.