Braneworld reheating in the bulk inflaton model

TL;DR

This paper investigates the reheating process in a braneworld inflation model driven by a bulk scalar field, demonstrating that standard reheating is recovered under certain conditions, supporting the model's viability for early universe cosmology.

Contribution

It provides a rigorous analysis of energy dissipation and reheating in the bulk inflaton braneworld model using Green's function methods, confirming its consistency with standard cosmology.

Findings

Reheating process is reproduced when Hubble parameter and scalar mass are small.

The late-time behavior of the bulk scalar field is derived.

The model is a viable alternative scenario for early universe inflation.

Abstract

In the context of the braneworld inflation driven by a bulk scalar field, we study the energy dissipation from the bulk scalar field into the matter on the brane in order to understand the reheating after inflation. Deriving the late-time behavior of the bulk field with dissipation by using the Green's function method, we give a rigorous justification of the statement that the standard reheating process is reproduced in this bulk inflaton model as long as the Hubble parameter on the brane and the mass of the bulk scalar field are much smaller than the 5-dimensional inverse curvature scale. Our result supports the idea that the brane inflation model caused by a bulk scalar field is expected to be a viable alternative scenario of the early universe.