Brane Dynamics in the Randall-Sundrum model, Inflation and Graceful Exit

Details Brane Dynamics in the Randall-Sundrum model, Inflation and Graceful Exit Brane Dynamics in the Randall-Sundrum model, Inflation and Graceful Exit

2001-03-29

arxiv.org/abs/hep-th/0103248v4

Class.Quant.Grav. 19 (2002) 5025-5038

Physics

High Energy Physics

High Energy Physics - Theory

Revised version, Accepted in Class. Quant. Gravity

Scientific paper

10.1088/0264-9381/19/20/301

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.

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