Cosmology in the Randall-Sundrum Brane World Scenario

TL;DR

This paper extends the study of Randall-Sundrum brane world cosmology to more general scenarios, showing that different AdS/Schwarzschild spaces on either side of the brane can lead to faster expansion during inflation and larger density perturbations.

Contribution

It introduces a generalized model with asymmetric AdS/Schwarzschild spaces, revealing increased inflationary expansion rates and perturbation amplitudes compared to fixed-size extra dimension models.

Findings

Faster expansion rate during inflation in generalized models

Larger amplitude of density perturbations produced

Extension to asymmetric AdS/Schwarzschild spaces

Abstract

The cosmology of the Randall-Sundrum scenario for a positive tension brane in a 5-D Universe with localized gravity has been studied extensively recently. Here we extend it to more general situations. We consider the time-dependent situation where the two sides of the brane are different AdS/Schwarzschild spaces. We show that the expansion rate in these models during inflation could be larger than in brane worlds with compactified extra dimensions of fixed size. The enhanced expansion rate could lead to the production of density perturbations of substantially larger amplitude.