Recent Progress in Baryogenesis

TL;DR

The article surveys the origin of the cosmological baryon asymmetry through three main avenues: Grand Unified Theory (GUT) baryogenesis, electroweak baryogenesis, and Affleck-Dine (AD) baryogenesis within supersymmetric frameworks. It developments in GUT scenarios, including the impact of inflation/reheating dynamics and the viability of leptogenesis, as well as electroweak baryogenesis with SUSY-assisted strong first-order phase transitions and CP-violating sources, are analyzed. It also details AD baryogenesis along SUSY flat directions, highlighting preheating effects and Q-ball dynamics as viable routes. Overall, the work emphasizes testable predictions, parameter-space constraints (notably from Higgs/stop spectra and CP-violating phases), and the interconnected roles of early-universe dynamics and particle physics beyond the Standard Model in explaining BAU.

Abstract

We provide an up to date account of progress in understanding the origin of the observed baryon asymmetry of the universe. While our primary goal is to be current, we have attempted to give a pedagogical introduction to the primary areas of research in this field, giving a detailed description of the different scenarios. The very recent developments in GUT baryogenesis, leptogenesis, electroweak baryogenesis and the Affleck-Dine mechanism are presented. In particular, we focus on specific particle physics implementations, mostly in the context of supersymmetry, which lead to specific testable predictions.