Perturbations in inflationary cosmologies with smooth exit

TL;DR

This paper analyzes the evolution of scalar and tensor perturbations during a smooth transition from inflation to radiation era, providing analytic solutions for different regimes.

Contribution

It offers a comprehensive analytic framework for perturbation evolution during smooth inflationary exit, extending previous models with explicit solutions.

Findings

Analytic expressions for super-horizon perturbations

Analytic forms for sub-horizon perturbations

Detailed transition dynamics from inflation to radiation era

Abstract

We give a comprehensive analysis of how scalar and tensor perturbations evolve in cosmologies with a smooth transition from power-law-like and de Sitter-like inflation to a radiation era. Analytic forms for the super-horizon and sub-horizon perturbations in the inflationary and radiation dominated eras are found.