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arxiv 2107.00450 v2 pith:VYEJQYNO submitted 2021-07-01 astro-ph.CO gr-qc

GW200105 and GW200115 are compatible with a scenario of primordial black hole binary coalescences

classification astro-ph.CO gr-qc
keywords blackprimordialscenariocompatiblegw200105gw200115holeholes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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