Rapid merger of binary primordial black holes: An implication for GW150914
Rapid merger of binary primordial black holes: An implication for GW150914
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DOI：
10.1093/pasj/psw065
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发表时间：
2009-09
影响因子：
2.3
通讯作者：
K. Hayasaki;Keitaro Takahashi;Y. Sendouda;Shigehiro Nagataki Chungbuk National University Kumamoto Uni Physics-Shigehiro-Nagataki-Chungbuk-National-University-Uni-102821879;K. University
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作者：
K. Hayasaki;Keitaro Takahashi;Y. Sendouda;Shigehiro Nagataki Chungbuk National University Kumamoto Uni Physics-Shigehiro-Nagataki-Chungbuk-National-University-Uni-102821879;K. University
我们提出了一个新的方案，一个二元的原始黑洞（PBH）的演化。我们考虑了环境暗物质的动力学摩擦、除了标准的两体驰豫过程以重新填充损失锥之外的具有高度偏心轨道的暗物质粒子的散射，以及双星和环双星盘之间的相互作用，假设PBH不构成暗物质的大部分。通过这些过程，二元PBH损失能量和角动量，这对于典型的配置来说是足够有效的。这样的双星由于引力波的发射而在比宇宙年龄短得多的时间尺度上合并。我们估计了由此产生的引力波背景的密度参数。本文还讨论了中等质量到超大质量黑洞形成的天体物理意义。
We propose a new scenario for the evolution of a binary of primordial black holes (PBHs). We consider a dynamical friction by ambient dark matter, scattering of dark matter particles with a highly eccentric orbit besides the standard two-body relaxation process to refill the loss cone, and interaction between the binary and a circumbinary disk, assuming that PBHs do not constitute the bulk of dark matter. Binary PBHs lose the energy and angular momentum by these processes, which could be sufficiently efficient for a typical configuration. Such a binary coalesces due to the gravitational wave emission in a time scale much shorter than the age of the universe. We estimate the density parameter of the resultant gravitational wave background. Astrophysical implication concerning the formation of intermediate-mass to supermassive black holes is also discussed.