Could the 2.6 $M_{\odot }$ object in GW190814 be a primordial black hole?

Abstract

On June 20, 2020, the LIGO-Virgo collaboration announced the discovery of GW190814, a gravitational wave event originating from a binary system merger between a black hole of mass $M_1=23.2_{-1.0}^{+1.1}{M}_{\odot }$ and an unidentified object with a mass of $M_2=2.59_{-0.09}^{+0.08}{M}_{\odot }$. This second object would be either the heaviest neutron star or lightest black hole observed to date. Here we investigate the possibility of the $\sim 2.6M_{\odot }$ object being a primordial black hole (PBH). We find that a primordial black hole explanation to GW190814 is unlikely as it is limited by the formation rate of the primary stellar progenitor and the observed merger rates of $\mathcal{O}(20)M_{\odot }$ massive black hole pairs.

Replaced with version accepted for publication in Phys. Rev. D

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