Dark Matter in the Time of Primordial Black Holes
  Hawking evaporation of primordial black holes (PBH) with masses ranging from
$\sim 10^{-1}$ to $\sim 10^9$ g can generate the whole observed dark matter
(DM) relic density. However, a second DM production mechanism, like freeze-out
or freeze-in, could have also been active in the early universe. Here we study
the interplay of these mechanisms, focusing on the scenario where PBHs dominate
the energy density of the universe, leading to a nonstandard cosmological era.
For concreteness, we use the singlet scalar DM model as an example for this
analysis.
