Spontaneous baryosynthesis with large initial phase

TL;DR

This paper numerically studies particle production in spontaneous baryogenesis with large initial phases, revealing saturation effects and scaling breakdown at large angles, advancing understanding of baryon asymmetry generation.

Contribution

It demonstrates the limitations of the cubic scaling law for baryon asymmetry at large initial phases in spontaneous baryogenesis.

Findings

Baryon asymmetry scales cubically with initial phase for small angles.

Scaling law breaks down at large angles, approaching saturation near π.

Particle production saturates as initial phase approaches π in Minkowski spacetime.

Abstract

We numerically investigate particle production by a pseudo-Nambu-Goldstone boson (pNGB) in spontaneous baryogenesis, focusing on large initial misalignment angles. Our analysis confirms the established cubic dependence of the baryon asymmetry on the initial phase for small angles. However, this scaling breaks down for larger angles, with particle production saturating as the initial phase approaches ${\pi}$ in Minkowski spacetime.