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タイトル: Hidden Universality in the Merger Rate Distribution in the Primordial Black Hole Scenario
著者: Kocsis, Bence
Suyama, Teruaki
Tanaka, Takahiro
Yokoyama, Shuichiro
著者名の別形: 田中, 貴浩
発行日: 10-Feb-2018
出版者: American Astronomical Society
誌名: The Astrophysical Journal
巻: 854
号: 1
論文番号: 41
抄録: It has been proposed that primordial black holes (PBHs) form binaries in the radiation dominated era. Once formed, some fraction of them may merge within the age of the universe by gravitational radiation reaction. We investigate the merger rate of the PBH binaries when the PBHs have a distribution of masses around O(10)M⨀, which is a generalization of the previous studies where the PBHs are assumed to have the same mass. After deriving a formula for the merger time probability distribution in the PBH mass plane, we evaluate it under two different approximations. We identify a quantity constructed from the mass distribution of the merger rate density per unit cosmic time and comoving volume R(m₁, m₂), α = -(m₁+m₂)² δ² In R/δm₁δm₂, which universally satisfies 0.97≲α≲1.05 for all binary masses independently of the PBH mass function. This result suggests that the measurement of this quantity is useful for testing the PBH scenario.
著作権等: Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
URI: http://hdl.handle.net/2433/231102
DOI(出版社版): 10.3847/1538-4357/aaa7f4
出現コレクション:学術雑誌掲載論文等

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