1. Brane dynamics in the Randall Sundrum model, inflation and graceful exit
- Author
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Debajyoti Choudhury, Dileep P. Jatkar, Anjan A. Sen, and Somdatta Bhattacharya
- Subjects
High Energy Physics - Theory ,Physics ,Physics::General Physics ,Physics and Astronomy (miscellaneous) ,Deceleration parameter ,Scalar (mathematics) ,FOS: Physical sciences ,Perturbation (astronomy) ,General Relativity and Quantum Cosmology (gr-qc) ,General Relativity and Quantum Cosmology ,Graceful exit ,Cosmology ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics - Theory (hep-th) ,Randall–Sundrum model ,Brane ,Ansatz ,Mathematical physics - 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., Comment: Revised version, Accepted in Class. Quant. Gravity
- Published
- 2002
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