Brane Dynamics in the Randall-Sundrum model, Inflation and Graceful Exit
Abstract
We study the averaged action of the Randall-Sundrum model with a time dependent metric ansatz. It can be reformulated in terms of a Brans-Dicke action with time dependent Newton's constant. We show that the physics of early universe, particularly inflation, is governed by the Brans-Dicke theory. The Brans-Dicke scalar, however, quickly settles to its equilibrium value and decouples from the post-inflationary cosmology. The deceleration parameter is negative to start with but changes sign before the Brans-Dicke scalar settles to its equilibrium value. Consequently, the brane metric smoothly exits inflation. We have also studied the slow-roll inflation in our model and investigated the spectra of the density perturbation generated by the radion field and find them consistent with the current observations.
Keywords
Cite
@article{arxiv.hep-th/0103248,
title = {Brane Dynamics in the Randall-Sundrum model, Inflation and Graceful Exit},
author = {Somdatta Bhattacharya and Debajyoti Choudhury and Dileep P. Jatkar and Anjan Ananda Sen},
journal= {arXiv preprint arXiv:hep-th/0103248},
year = {2009}
}
Comments
Revised version, Accepted in Class. Quant. Gravity