Gravitational wave microlensing by dressed primordial black holes

Understand

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 $1\sigma$ bound on the abundance of PBHs heavier than $50 M_{\odot}$.
• The next generation observatories can potentially probe PBHs as light as $0.01 M_\odot$ and down to $2\times10^{-4}$ fraction of all dark matter.