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We investigate the possibility of the gravitational-wave event GW170817 beinga light, solar-mass black hole (BH) - neutron star (NS) merger. We explore twoexotic scenarios involving primordial black holes (PBH) that could produce suchan event, taking into account available observational information on NGC 4993.First, we entertain the possibility of dynamical NS-PBH binary formation wherea solar-mass PBH and a NS form a binary through gravitational interaction. Wefind that while dynamical NS-PBH formation could account for the GW170817event, the rate is highly dependent on unknown density contrast factors andcould potentially be affected by galaxy mergers. We also find that PBH-PBHbinaries would likely have a larger merger rate, assuming the density contrastboost factor of an order similar to the NS-PBH case. These exotic mergerformations could provide new channels to account for the volumetric rate ofcompact-object mergers reported by LIGO/Virgo. Secondly, we consider the casewhere one of the NS's in a binary NS system is imploded by a microscopic PBH.We find that the predicted rate for NS implosion into a BH is very small, atleast for the specific environment of NGC 4993. We point out that similarexisting (e.g. GW190425 and GW190814) and future observations will shedadditional light on these scenarios.

Is GW170817 a Multimessenger Neutron Star-Primordial Black Hole Merger?