Gravitational recoil from binary black hole mergers in scalar field clouds
Gravitational recoil from binary black hole mergers in scalar field clouds
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DOI：
10.1103/physrevd.107.044039
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发表时间：
2022-09
影响因子：
5
通讯作者：
Yu-Peng Zhang;M. Gracia-Linares;P. Laguna;D. Shoemaker;Yu-Xiao Liu
中科院分区：
文献类型：
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作者：
Yu-Peng Zhang;M. Gracia-Linares;P. Laguna;D. Shoemaker;Yu-Xiao Liu
在真空中，两个黑洞合并后的最后一个黑洞的引力反冲完全取决于合并黑洞的质量比和自旋，以及双星的偏心率。如果存在物质，合并黑洞的吸积可能会显著改变它们的质量和自旋，改变双星的动力学和残余黑洞的引力反冲。本文考虑这种情况。我们研究了将双星浸没在标量场云中对最终黑洞反冲的影响。我们考虑两种类型的配置：一个与非旋转和不等质量的黑洞，第二个与等质量和旋转的孔。对于这两种类型，我们调查如何重力反冲的最终黑洞的变化，因为我们改变的标量场的能量密度。我们发现，合并黑洞对标量场的吸积可能会产生深远的影响。对于非旋转的不等质量双星黑洞，反冲一般比真空中的大，质量比为2：1的双星的速度约为1，200 km/s，比真空中大一个数量级。对于相同的质量，双星与黑洞的自旋对准的轨道角动量，踢大于在vacuum.For系统的自旋在超级踢配置，标量场触发类似的依赖性的踢与入口角在合并的真空情况下，但在这种情况下，取决于标量场的强度。
In vacuum, the gravitational recoil of the final black hole from the merger of two black holes depends exclusively on the mass ratio and spins of the coalescing black holes, and on the eccentricity of the binary. If matter is present, accretion by the merging black holes may modify significantly their masses and spins, altering both the dynamics of the binary and the gravitational recoil of the remnant black hole. This paper considers such scenario. We investigate the effects on the kick of the final black hole from immersing the binary in a scalar field cloud. We consider two types of configurations: one with non-spinning and unequal-mass black holes, and a second with equal mass and spinning holes. For both types, we investigate how the gravitational recoil of the final black hole changes as we vary the energy density of the scalar field. We find that the accretion of scalar field by the merging black holes could have a profound effect. For the non-spinning, unequal-mass binary black holes, the kicks are in general larger than in the vacuum case, with speeds of approximately 1,200 km/s for binaries with mass ratio 2:1, one order of magnitude larger than in vacuum. For equal mass, binaries with black holes with spins aligned with the orbital angular momentum, kicks larger than in vacuum are also found. For systems with spins in the super-kick configuration, the scalar field triggers a similar dependence of the kicks with the entrance angle at merger as in the vacuum case but in this case depending on the strength of the scalar field.