Preheating in Dirac-Born-Infeld inflation

TL;DR

This paper investigates the reheating process after Dirac-Born-Infeld inflation, analyzing how nonlinearities affect particle production and estimating the initial temperature of the universe's hot phase.

Contribution

It provides a detailed comparison of reheating in Dirac-Born-Infeld inflation with canonical models, highlighting the impact of nonlinearities on particle production mechanisms.

Findings

Reheating can be efficient in Dirac-Born-Infeld inflation.

Nonlinearities modify the structure of non-perturbative resonances.

Estimated initial temperature of the hot universe phase.

Abstract

We study how the universe reheats following an era of chaotic Dirac-Born-Infeld inflation, and compare the rate of particle production with that in models based on canonical kinetic terms. Particle production occurs through non-perturbative resonances whose structure is modified by the nonlinearities of the Dirac-Born-Infeld action. We investigate these modifications and show that the reheating process may be efficient. We estimate the initial temperature of the subsequent hot, radiation-dominated phase.