Chaotic inflation on the Randall-Sundrum 2-brane model

TL;DR

This paper develops an inflation model within the Randall-Sundrum 2-brane framework, analyzing how a bulk scalar field influences inflationary dynamics and observational constraints, using two different stabilization approaches.

Contribution

It introduces a novel inflation model on the RS 2-brane with a bulk scalar field, comparing two stabilization mechanisms and their effects on inflation.

Findings

The model can satisfy observational constraints.

Two stabilization approaches yield different inflationary dynamics.

The bulk scalar field impacts the inflationary potential and evolution.

Abstract

We construct an inflation model on the Randall-Sundrum I (RSI) brane where a bulk scalar field stabilizes the inter-brane separation. We study impact of the bulk scalar field on the inflationary dynamics on the brane. We proceed in two different approaches: in the first approach, the stabilizing field potential is directly appeared in the Friedmann equation and the resulting scenario is effectively a two-field inflation. In the second approach the stabilization mechanism is considered in the context of a warp factor so that there is just one field present that plays the roles of both inflaton and stabilizer. We study constraints imposed on the model parameters from recent observations.