  The population of black holes inferred from the detection of gravitational
waves by the LIGO-Virgo-KAGRA Collaboration has revealed interesting features
in the properties of black holes in the Universe. We analyze the GWTC-3 dataset
assuming the detected black holes in each event had an either astrophysical or
primordial origin. In particular, we consider astrophysical black holes
described by the fiducial \textsc{Power Law + Peak} distribution and primordial
black holes whose mass function obeys a broken power law. These primordial
black holes can be generated by vacuum bubbles that nucleate during inflation.
We find that astrophysical black holes dominate the events with mass less than
$\sim 30M_\odot$, whereas primordial black holes are responsible for the
massive end, and also for the peak at $\sim 30M_\odot$ in the mass
distribution. More than half of the observed events could come from primordial
black hole mergers. We also discuss the implications on the primordial black
hole formation mechanism and the underlying inflationary model.
