Effective Inspiral Spin Distribution of Primordial Black Hole Binaries
Effective Inspiral Spin Distribution of Primordial Black Hole Binaries
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DOI：
10.3847/1538-4357/ac93f1
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Yasutaka Koga;T. Harada;Y. Tada;Shuichiro Yokoyama;Chul-Moon Yoo
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文献类型：
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作者：
Yasutaka Koga;T. Harada;Y. Tada;Shuichiro Yokoyama;Chul-Moon Yoo
考虑引力坍缩临界现象的影响，研究了原始黑洞双星的有效自旋、质量比和啁啾质量的概率分布。作为一阶估计，假设双星是由根据单个PBH的概率分布随机选择的两个PBH组成的，为简单起见，不考虑吸积对每个PBH质量和自旋的影响。我们发现，虽然临界现象可以导致在低质量尾部产生大的自旋，但双星的有效自旋在统计上非常小，< χeff2 > ~ 10−3。我们还看到，有效自旋和质量比之间几乎没有反相关关系，这可以从观测中推断出来。
We investigate the probability distribution of the effective inspiral spin, the mass ratio, and the chirp mass of primordial black hole (PBH) binaries, incorporating the effect of the critical phenomena of gravitational collapse. As a leading order estimation, each binary is assumed to be formed from two PBHs that are randomly chosen according to the probability distribution of single PBHs, and the accretion effects on the mass and spin of each PBH are not considered for simplicity. We find that, although the critical phenomena can lead to large spins on the low-mass tail, the effective inspiral spin of the binary is statistically very small, 〈χeff2〉∼10−3 . We also see that there is almost no anticorrelation between the effective inspiral spin and the mass ratio, which can be inferred from observations.