Speaker
Description
Non-cold dark-matter particles can arise from the evaporation of primordial black holes (PBHs). In this talk, I'll discuss how memory-burden effect, that delays the full evaporation of black holes, affects the Lyman-α bound on such non-cold dark-matter particles. In the latter framework, PBH evaporation generically leads to two distinct dark-
matter populations with different velocity dispersions, which can imprint observable signatures on the matter power spectrum and impact small-scale overdensities. This is used to reinterpret Lyman-α forest constraints for thermal warm dark matter. In particular, I'll show that even subdominant non-cold dark-matter particle components from PBH evaporation can be constrained and confirm that non-cold dark-matter can only account for all the dark matter in the absence of PBH domination, as in the semi-classical case.
| Main Contribution topic | Cosmology Dark Matter |
|---|---|
| Secondary contribution topic | Astrophysical observations |