Ultraheavy Dark Matter and WIMPs Production aided by Primordial Black Holes

TL;DR

This paper explores how primordial black holes can produce ultraheavy dark matter and WIMPs, affecting relic density predictions and expanding the viable mass range for dark matter particles.

Contribution

It demonstrates that Hawking evaporation from primordial black holes can generate ultraheavy dark matter and analyzes their impact on relic density in non-standard cosmologies.

Findings

Hawking evaporation can produce dark matter above 10^{12} GeV.

Primordial black holes influence relic density through entropy injection.

Heavy dark matter particles above 10 TeV can match observed relic density.

Abstract

The unitary bound restricts thermal relics to be lighter than $100$ TeV. This work investigates the production of ultraheavy dark matter and WIMPs in the presence of primordial black holes. Firstly, we describe how Hawking evaporation can produce ultraheavy dark matter with masses above $10^{12}$ GeV in radiation and matter-domination eras. Later, we assess how primordial black holes that induce a non-standard cosmology impact the predicted relic density of a thermal relic and explore the interplay between them, considering the restrictions arising from entropy injection due to the evaporation of primordial black holes. Considering a concrete B-L model, where the dark matter is a Dirac particle, we obtain the correct relic density for various freeze-out scenarios and show that a dark matter particle can nicely reproduce the correct relic density in agreement with current limits with masses above the $10$ TeV scale. Hence, this work strengthens the continuous search for heavy dark matter particles.