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Abstract

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.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

Journal

  • Physical review letters

    Physical review letters 117(6), 061101, 2016-08-02

    American Physical Society

Codes

  • NII Article ID (NAID)
    120005825908
  • NII NACSIS-CAT ID (NCID)
    AA11734748
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    1079-7114
  • Data Source
    IR 
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