Efficient electroweak baryogenesis by black holes

TL;DR

This paper proposes a new cosmological mechanism for electroweak baryogenesis involving primordial black holes in a Randall-Sundrum universe, leveraging Hawking radiation and accretion to produce the observed matter-antimatter asymmetry efficiently.

Contribution

It introduces a novel black hole-based baryogenesis scenario that operates without a first order phase transition and is highly efficient due to accretion effects in a high-energy cosmological setting.

Findings

Baryon asymmetry can be generated with small CP violation angles.

Black hole accretion prolongs black hole lifetime, enhancing baryogenesis.

The mechanism is compatible with black hole masses from higher-dimensional Planck scale interactions.

Abstract

A novel cosmological scenario, capable to generate the observed baryon number at the electroweak scale for very small CP violating angles, is presented. The proposed mechanism can be applied in conventional FRW cosmology, but becomes extremely efficient due to accretion in the context of early cosmic expansion with high energy modifications. Assuming that our universe is a Randall-Sundrum brane, baryon asymmetry can easily be produced by Hawking radiation of very small primordial black holes. The Hawking radiation reheats a spherical region around every black hole to a high temperature and the electroweak symmetry is restored there. A domain wall is formed separating the region with the symmetric vacuum from the asymmetric region where electroweak baryogenesis takes place. First order phase transition is not needed. The black holes's lifetime is prolonged due to accretion, resulting to strong efficiency of the baryon producing mechanism. The allowed by the mechanism black hole mass range includes masses that are energetically favoured to be produced from interactions around the higher dimensional Planck scale.