# Nambu-Goldstone Affleck-Dine Baryogenesis

## TL;DR

This paper explores a baryogenesis mechanism utilizing a pseudo-Nambu-Goldstone boson from spontaneous symmetry breaking, providing a natural flat potential and a concrete SU(N) gauge theory realization, with implications for early universe physics.

## Contribution

It introduces a novel realization of Affleck-Dine baryogenesis using a pseudo-Nambu-Goldstone boson, integrating chiral symmetry breaking and the Peccei-Quinn mechanism.

## Key findings

- Constructed a concrete SU(N) gauge theory model
- Demonstrated natural flatness of the scalar potential
- Discussed implications for early universe cosmology

## Abstract

The Affleck-Dine mechanism creates the baryon asymmetry of the universe from an angular motion of a complex scalar field. The mechanism is efficient and allows for a low reheating temperature of the universe if the scalar field has a flat potential along its radial direction. We consider a possibility where the scalar field is a pseudo-Nambu-Goldstone boson arising from spontaneous breaking of an approximate global symmetry, so that the flatness of the potential is naturally understood. We construct a concrete realization of the idea based on chiral symmetry breaking in an SU(N) gauge theory. The Peccei-Quinn mechanism can be consistently incorporated into the model. We also comment on a possible impact of the model on early universe physics.