Baryogenesis through Asymmetric Hawking Radiation from Primordial Black
  Holes as Dark Matter
  We examine the extent to which primordial black holes (PBHs) can constitute
the observed dark matter while also giving rise to the measured
matter-antimatter asymmetry and account for the observed baryon abundance
through asymmetric Hawking radiation generated by a derivative coupling of
curvature to the baryon-lepton current. We consider both broad and
monochromatic mass spectra for this purpose. For the monochromatic spectrum we
find that the correct dark matter and baryon energy densities are recovered for
peak masses of the spectrum of $M_{\rm pk} \geq 10^{12}$ kg whereas for the
broad case the observed energy densities can be reproduced regardless of peak
mass. Adopting some simplifications for the early-time expansion history as a
first approximation, we also find that the measured baryon asymmetry can be
recovered within an order of magnitude. We argue furthermore that the correct
value of the baryon-lepton yield can in principle be retrieved for scenarios
where a significant amount of the radiation is produced by PBH decay during or
after reheating, as is expected when the decaying PBHs also cause reheating, or
when an early matter-dominated phase is considered. We conclude from this first
analysis that the model merits further investigation.
