Source of CP Violation for the Baryon Asymmetry of the Universe

TL;DR

This paper explores how a hypothetical fourth generation of particles could provide sufficient CP violation to explain the universe's matter-antimatter asymmetry, reviewing current research and future directions.

Contribution

It presents a comprehensive analysis of how a fourth generation could enhance CP violation for baryogenesis, including experimental and theoretical perspectives.

Findings

Fourth generation likely provides enough CP violation for baryogenesis

Survey of experimental and theoretical pursuits in the field

Discussion on unitarity violation and heavy chiral quarks

Abstract

We give a description of why the existence of a fourth generation is likely to provide enough CP violation for baryogenesis, and trace how this observation came about. We survey the current experimental and theoretical pursuits and outline a research agenda, touching upon unitarity violation and very heavy chiral quarks, and comment on how the electroweak phase transition picture might be altered.