Baryogenesis from Exploding Primordial Black Holes

TL;DR

Primordial black holes exploding after the electroweak phase transition can generate the universe's baryon asymmetry through Hawking radiation-induced shocks and CP violation, with minimal parameter dependence.

Contribution

This work introduces a novel baryogenesis mechanism involving exploding primordial black holes and Hawking radiation-driven shocks.

Findings

Mechanism can produce observed baryon asymmetry

Requires only minimal dependence on PBH parameters

Involves electroweak symmetry restoration in shock regions

Abstract

Exploding primordial black holes can source baryon asymmetry soon after the electroweak phase transition, as high-energy Hawking radiation drives ultrarelativistic shocks in the surrounding plasma. The shocks and their trailing rarefaction waves delineate two bubble-like walls around a shell of superheated fluid, in which electroweak symmetry is restored. These moving interfaces source chiral charge, which is converted to baryon number. Upon adding a simple CP-violating operator at the TeV scale, this mechanism yields the observed baryon asymmetry with minimal dependence on PBH model parameters.