Steep Inflation followed by Born-Infeld Reheating

TL;DR

This paper presents a cosmological model where a scalar field drives inflation and late-time acceleration, with reheating achieved through Born-Infeld matter that transitions from a cosmological constant-like state to radiation, avoiding overproduction of gravitational waves.

Contribution

The model introduces a novel reheating mechanism using Born-Infeld matter, which naturally transitions from a cosmological constant to radiation without fine-tuning.

Findings

Reheating via Born-Infeld matter avoids gravitational wave overproduction.

Scalar field successfully drives inflation and late-time acceleration.

Reheating mechanism requires no additional fine-tuning.

Abstract

We discuss a model in which high energy brane corrections allow a single scalar field to describe inflation at early epochs and quintessence at late times. The reheating mechanism in the model originates from Born-Infeld matter whose energy density mimics cosmological constant at very early times and manifests itself as radiation subsequently. For most of the inflationary evolution the Born-Infeld matter remains subdominant to the the scalar field. Shortly before the end of inflation driven by the scalar field, the energy density of Born-Infeld matter starts scaling as radiation and drops by several orders of magnitudes at the epoch inflation ends. The problem of over production of gravity wave background in scenarios based upon reheating through gravitational particle production is successfully resolved by suitably fixing the initial value of radiation energy density at the end of inflation. No additional fine tuning of the parameters is required for a viable evolution.