Non-Gaussian Effects on Domain Growth

TL;DR

This paper investigates how non-Gaussian effects influence domain growth during a second order phase transition, revealing larger domains and potential reductions in defect density compared to Gaussian-based predictions.

Contribution

It provides the first detailed calculation of the vacuum two-point function beyond Gaussian approximation during phase transition, highlighting the significance of non-Gaussian effects.

Findings

Non-Gaussian effects dominate at later stages of the transition.

Larger domain sizes are observed due to non-Gaussian contributions.

Potential reduction in topological defect density compared to Gaussian models.

Abstract

The vacuum two-point function is calculated beyond the Gaussian approximation during the second order phase transition. It is found that the correlation function is dominated by the Gaussian term immediately after the phase transition but later is taken over by non-Gaussian terms as the spinodal instability continues. The non-Gaussian effects lead to larger size of domains and may imply a smaller density of topological defects than that predicted by the Hartree-Fock approximation.