Abstract
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.
Highlights
Evidence of tides or tidal disruption identified no electromagnetic counterparts
We show that a scenario of primordial black hole (PBH) binary coalescences can explain the origin of GW200105 and GW200115
We have shown that the scenario of PBH binary coalescences can account for the observed merger rates of GW200105 and GW200115
Summary
We show that a scenario of primordial black hole (PBH) binary coalescences can explain the origin of GW200105 and GW200115. PBHs can form binaries through several formation channels [13,14] Amongst these channels, the most efficient one was originally proposed in Refs. To determine if GW200105 and GW200115 are primordial, we have to check whether their merger rate densities can be accounted for with the corresponding PBH abundance allowed by the existing upper limits We will compute the merger rate density of PBHs in two specific models by following Ref. The second one assumes that all the black hole binary coalescences observed by LVC are primordial.
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