Baryon asymmetry from primordial black holes

TL;DR

This paper introduces a novel baryogenesis mechanism involving primordial black holes, where their evaporation under certain conditions produces the observed matter-antimatter asymmetry in the universe.

Contribution

It proposes a new scenario of baryogenesis from PBHs utilizing higher-dimensional CP-violating operators, capable of generating sufficient asymmetry across various parameters.

Findings

Sufficient baryon asymmetry can be produced for a wide range of PBH masses and abundances.

The mechanism operates despite suppression by a high mass scale $M_*$.

The scenario links black hole physics with matter-antimatter asymmetry.

Abstract

We propose a new scenario of the baryogenesis from primordial black holes (PBH). Assuming presence of microscopic baryon (or lepton) number violation and a CP violating operator such as $\partial_\alpha F(\mathcal{R_{....}} ) J^\alpha$, where $F(\mathcal{R_{....}})$ is a scalar function of the Riemann tensor, time evolution of an evaporating black hole generates baryonic (leptonic) chemical potential at the horizon; consequently PBH enumerates asymmetric Hawking radiation between baryons (leptons) and anti-baryons (leptons). Though the operator is higher dimensional and largely suppressed by a high mass scale $M_*$, we show that sufficient amount of asymmetry can be generated for a wide range of parameters of the PBH mass $M_{\rm PBH}$, its abundance $\Omega_{\rm PBH}$, and the scale $M_*$.