On graviton production in braneworld cosmology

Details On graviton production in braneworld cosmology On graviton production in braneworld cosmology

2005-10-18

arxiv.org/abs/hep-th/0510155v2

Phys.Rev.D72:104018,2005

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, minor changes, references corrected

Scientific paper

10.1103/PhysRevD.72.104018

We study braneworlds in a five dimensional bulk, where cosmological expansion is mimicked by motion through AdS$_5$. We show that the five dimensional graviton reduces to the four dimensional one in the late time approximation of such braneworlds. Inserting a fixed regulator brane far from the physical brane, we investigate quantum graviton production due to the motion of the brane. We show that the massive Kaluza-Klein modes decouple completely from the massless mode and they are not generated at all in the limit where the regulator brane position goes to infinity. In the low energy limit, the massless four dimensional graviton obeys the usual 4d equation and is therefore also not generated in a radiation-dominated universe.

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