Regular Article - Theoretical Physics
GW200105 and GW200115 are compatible with a scenario of primordial black hole binary coalescences
Theoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, People’s Republic of China
2 School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, People’s Republic of China
3 Department of Astronomy, Beijing Normal University, 100875, Beijing, People’s Republic of China
Accepted: 30 December 2021
Published online: 6 January 2022
Two gravitational wave events, i.e. GW200105 and GW200115, were observed by the Advanced LIGO and Virgo detectors recently. In this work, we show that they can be explained by a scenario of primordial black hole binaries that are formed in the early Universe. The merger rate predicted by such a scenario could be consistent with the one estimated from LIGO and Virgo, even if primordial black holes constitute a fraction of cold dark matter. The required abundance of primordial black holes is compatible with the existing upper limits from microlensing, caustic crossing and cosmic microwave background observations.
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