Particle creation and reheating in a braneworld inflationary scenario

TL;DR

This paper investigates particle creation during tachyon-driven inflation in a braneworld scenario, showing how matter modifies cosmology and leads to reheating through gauge field interactions.

Contribution

It introduces a model combining D-brane dynamics, matter effects, and gauge fields to analyze particle creation and reheating in braneworld inflation.

Findings

Matter alters the warp factor and tachyon potential.

Interaction with U(1) gauge field drives particle creation.

Reheating estimates are provided at inflation's end.

Abstract

We study the cosmological particle creation in the tachyon inflation based on the D-brane dynamics in the RSII model extended to include matter in the bulk. The presence of matter modifies the warp factor which results in two effects: a modification of the RSII cosmology and a modification of the tachyon potential. Besides, a string theory D-brane supports among other fields a U(1) gauge field reflecting open strings attached to the brane. We demonstrate how the interaction of the tachyon with the U(1) gauge field drives cosmological creation of massless particles and estimate the resulting reheating at the end of inflation.