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

Understand

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.