Non-thermal WIMPy Baryogenesis with Primordial Black Hole

TL;DR

This paper explores how primordial black holes can produce weakly interacting massive particles that explain dark matter and baryon asymmetry through B and CP violation, with implications for indirect dark matter detection.

Contribution

It proposes a novel scenario where primordial black hole evaporation generates dark matter and baryon asymmetry, detailing the relevant cross sections and observational prospects.

Findings

Primordial black holes with mass less than 10^7 g can produce TeV dark matter.

Dark matter annihilation cross section is estimated to be less than 10^{-7} GeV^{-2}.

B-violating scattering cross section is estimated to be less than 2×10^{-9} GeV^{-2}.

Abstract

We consider the possibility that the weakly interacting massive particles produced from the evaporation of primordial black hole can explain both the relic density of dark matter and the baryon asymmetry of the Universe, through their annihilation which violate B and CP-symmetry. We find that the primordial black hole with mass less than $10^7 {\rm g}$ is a good candidate as an source of TeV dark matter with the total annihilation cross section $\left\langle\sigma_a \upsilon\right\rangle \lesssim 10^{-7} \ {\rm GeV}^{-2}$ and the B-violating scattering cross section $\left\langle\sigma_B \upsilon\right\rangle \lesssim 2\times 10^{-9} \ {\rm GeV^{-2}}$. This large annihilation cross section of dark matter in this model would make it available to search them in the indirect search for dark matter such as gamma-ray or neutrino observations.