Thermal Effects on Saxion in Supersymmetric Model with Peccei-Quinn Symmetry

TL;DR

This paper investigates how thermal effects influence the behavior of the saxion field in a supersymmetric Peccei-Quinn model, impacting early universe evolution through potential deformation and dissipation mechanisms.

Contribution

It provides a detailed analysis of thermal effects on saxion dynamics, highlighting their significance in cosmological evolution within supersymmetric models.

Findings

Thermal effects deform the saxion potential.

Saxion oscillations dissipate via hot plasma interactions.

These effects alter early universe evolution.

Abstract

We consider supersymmetric model with Peccei-Quinn symmetry and study effects of saxion on the evolution of the universe, paying particular attention to the effects of thermal bath. The axion multiplet inevitably couples to colored particles, which induces various thermal effects. In particular, (i) saxion potential is deformed by thermal effects, and (ii) coherent oscillation of the saxion dissipates via the interaction with hot plasma. These may significantly affect the evolution of the saxion in the early universe.