Gravitational wave microlensing by dressed primordial black holes
Theoretical Physics Letters
2023 ° 02(04) ° 10-06
We study gravitational wave microlensing by primordial black holes (PBHs), accounting for the effect of a particle dark matter minihalo surrounding them. Such minihaloes are expected when PBHs make up only a fraction of all dark matter. We find that the LIGO-Virgo detections imply a 1σ bound on the abundance of PBHs heavier than 50M. The next generation observatories can potentially probe PBHs as light as 0.01M and down to 2 × 10−4 fraction of all dark matter. We also show that these detectors can distinguish between dressed and naked PBHs, providing a novel way to study the distribution of particle dark matter around black holes and potentially shed light on the origins of black holes.