Dynamics of Peccei-Quinn Breaking Field after Inflation and Axion Isocurvature Perturbations

TL;DR

This paper investigates the post-inflation dynamics of the Peccei-Quinn field, addressing isocurvature perturbations and proposing a model that prevents domain wall formation through suppressed parametric resonance.

Contribution

It introduces a novel model where parametric resonance is suppressed, avoiding domain wall formation and aligning with supersymmetric theories.

Findings

Proposes a model with suppressed parametric resonance.

Ensures consistency with supersymmetric theories.

Addresses isocurvature perturbation suppression.

Abstract

The Peccei-Quinn mechanism suffers from the problem of the isocurvature perturbations. The isocurvature perturbations are suppressed if the Peccei-Quinn breaking scale is large during inflation. The oscillation of the Peccei-Quinn breaking field after inflation, however, leads to the formation of domain walls due to the parametric resonance effect. In this paper, we discuss the evolution of the Peccei-Quinn breaking field after inflation in detail, and propose a model where the parametric resonance is ineffective and hence domain walls are not formed. We also discuss consistency of our model with supersymmetric theory.