Others Primordial Black Hole Scenario for the Gravitational-Wave Event GW150914

Sasaki, Misao  ,  Suyama, Teruaki  ,  Tanaka, Takahiro  ,  Yokoyama, Shuichiro

117 ( 6 ) 2016-08-02 , American Physical Society , Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University , Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo , Department of Physics, Kyoto University , Department of Physics, Rikkyo University
UTokyo Research掲載「初めて観測された重力波の起源は原始ブラックホール?」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/Can-the-origin-of-the-first-gravitational-waves-detected-be-traced-back-to.html
UTokyo Research "Can the origin of the first gravitational waves detected be traced back to primordial black holes?" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/can-the-origin-of-the-first-gravitational-waves-detected-be-traced-back-to.html
We point out that the gravitational-wave event GW150914 observed by the LIGO detectors can be explained by the coalescence of primordial black holes (PBHs). It is found that the expected PBH merger rate would exceed the rate estimated by the LIGO Scientific Collaboration and the Virgo Collaboration if PBHs were the dominant component of dark matter, while it can be made compatible if PBHs constitute a fraction of dark matter. Intriguingly, the abundance of PBHs required to explain the suggested lower bound on the event rate, >2  events  Gpc−3 yr−1, roughly coincides with the existing upper limit set by the nondetection of the cosmic microwave background spectral distortion. This implies that the proposed PBH scenario may be tested in the not-too-distant future.


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