Cosmology and Hierarchy in Stabilized Randall-Sundrum Models

Details Cosmology and Hierarchy in Stabilized Randall-Sundrum Models Cosmology and Hierarchy in Stabilized Randall-Sundrum Models

2000-10-03

arxiv.org/abs/hep-ph/0010022v1

Int.J.Mod.Phys. A16S1C (2001) 946-948

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 1 figure, 1 table. Talk given at DPF 2000, Columbus, OH, August 12, 2000

Scientific paper

10.1142/S0217751X01008576

We consider the cosmology and hierarchy of scales in models with branes immersed in a five-dimensional curved spacetime subject to radion stabilization. The universe naturally find itself in the radiation-dominated epoch when the inter-brane spacing is static and stable, independent of the form of the stabilizing potential. We recover the standard Friedmann equations without assuming a specific form for the bulk energy-momentum tensor. We address the hierarchy problem in the context of a quartic and exponential stabilizing potential, and find that in either case the presence of a negative tension brane is required and that the string scale can be as low as the electroweak scale. In the situation of self-tuning branes (corresponding to an exponential potential) where the bulk cosmological constant is set to zero, the brane tensions have hierarchical values.

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