The cosmic coincidences of primordial-black-hole dark matter
  If primordial black holes (PBHs) contribute more than 10 percent of the dark
matter (DM) density, their energy density today is of the same order as that of
the baryons. Such a cosmic coincidence might hint at a mutual origin for the
formation scenario of PBHs and the baryon asymmetry of the Universe.
Baryogenesis can be triggered by a sharp transition of the rolling rate of
inflaton from slow-roll to (nearly) ultraslow-roll phases that produces large
curvature perturbations for PBH formation in single-field inflationary models.
We show that the baryogenesis requirement drives the PBH contribution to DM,
along with the inferred PBH mass range, the resulting stochastic gravitational
wave background frequency window, and the associated cosmic microwave
background tensor-to-scalar ratio amplitude, into potentially observable
regimes.
