Dark Matter in the Time of Primordial Black Holes

Understand

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.