A Model of Curvature-Induced Phase Transitions in Inflationary Universe

TL;DR

This paper explores how space-time curvature influences chiral phase transitions in the early universe, revealing conditions for symmetry restoration and potential cosmological phenomena like bubble formation and cosmic strings.

Contribution

It introduces a model analyzing curvature-induced phase transitions in an inflationary universe context, identifying phase transition types and critical parameters.

Findings

Symmetry restoration occurs via first and second order phase transitions.

Critical curves for phase boundaries are derived.

Implications include bubble formation and cosmic string creation during inflation.

Abstract

Chiral phase transitions driven by space-time curvature effects are investigated in de Sitter space in the supersymmetric Nambu-Jona-Lasinio model with soft supersymmetry breaking. The model is considered to be suitable for the analysis of possible phase transitions in inflationary universe. It is found that a restoration of the broken chiral symmetry takes place in two patterns for increasing curvature : the first order and second order phase transition respectively depending on initial settings of the four-body interaction parameter and the soft supersymmetry breaking parameter. The critical curves expressing the phase boundaries in these parameters are obtained. Cosmological implications of the result are discussed in connection with bubble formations and the creation of cosmic strings during the inflationary era.