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Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios

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arxiv 2101.11015 v2 pith:KSNPRPPF submitted 2021-01-26 gr-qc astro-ph.HE

Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios

classification gr-qc astro-ph.HE
keywords eccentricitykickrecoilbinariesblackdirectionholelead
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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