Inflation on a Warped Dvali-Gabadadze-Porrati Brane

TL;DR

This paper presents a novel inflation model on a warped DGP brane driven by a scalar field with an exponential potential, which naturally exits inflation and aligns with observational data.

Contribution

It introduces a new inflationary scenario on a warped DGP brane with spontaneous exit and compatible perturbation spectrum running.

Findings

Inflation ends spontaneously without additional mechanisms.

Scalar perturbation spectral index running matches observations.

Model parameters are within reasonable physical ranges.

Abstract

We discuss an inflation model, in which the inflation is driven by a single scalar field with exponential potential on a warped DGP brane. In contrast to the power law inflation in standard model, we find that the inflationary phase can exit spontaneously without any mechanism. The running of the index of scalar perturbation spectrum can take an enough large value to match the observation data, while other parameters are in a reasonable region.