Dynamical Breaking of CPT and Baryogenesis

TL;DR

This paper reviews how topological defect networks could have caused dynamical CPT symmetry breaking in the early Universe, leading to matter-antimatter asymmetry, with a focus on defect-mediated baryogenesis mechanisms.

Contribution

It discusses the potential role of topological defects in dynamical CPT breaking and introduces defect-mediated baryogenesis scenarios, including electroweak and QCD scale baryogenesis.

Findings

Topological defects may facilitate baryogenesis through CPT symmetry breaking.

Defect-mediated electroweak baryogenesis is a significant mechanism.

QCD scale baryogenesis via defects is a recent proposal.

Abstract

The asymmetry between matter and antimatter in the Universe indicates that there was a period in the very early Universe when the CPT symmetry was broken. The conservative interpretation is that the breaking was dynamical, induced by the distinguished direction of time stemming from the cosmological expansion. Here, I review the role which topological defect networks may play in baryogenesis and how this relates to dynamical CPT symmetry breaking. Particular attention is placed on defect-mediated electroweak baryogenesis. A recent suggestion of defect-mediated QCD scale baryogenesis is also mentioned.