Asymmetries from a charged memory-burdened PBH

TL;DR

This paper proposes a gravitational mechanism involving charged primordial black holes to simultaneously explain the universe's matter-antimatter asymmetry and dark matter abundance, considering quantum effects on black hole dynamics.

Contribution

It introduces a novel model linking charged PBH Hawking radiation with baryon asymmetry and dark matter, including quantum effects beyond semiclassical approximation.

Findings

Consistent explanation of baryon asymmetry and dark matter abundance.

Parameter space identified satisfying cosmological bounds.

Quantum effects on charged PBH dynamics are significant.

Abstract

We explore a purely gravitational origin of observed baryon asymmetry and dark matter (DM) abundance from asymmetric Hawking radiation of light primordial black holes (PBH) in presence of a non-zero chemical potential, originating from the space-time curvature. Considering the PBHs are described by a Reissner-Nordstr\"{o}m metric, and are produced in a radiation dominated Universe, we show, it is possible to simultaneously explain the matter-antimatter asymmetry along with right DM abundance satisfying bounds from big bang nucleosynthesis, cosmic microwave background and gravitational wave energy density due to PBH density fluctuation. We also obtain the parameter space beyond the semiclassical approximation, taking into account the quantum effects on charged PBH dynamics due to memory burden.