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arXiv · hep-ph/0006275

Cosmology and Hierarchy in Stabilized Warped Brane Models

V. Barger·T. Han·T. Li·J. D. Lykken·D. Marfatia
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Abstract

We examine the cosmology and hierarchy of scales in models with branes immersed in a five-dimensional curved spacetime subject to radion stabilization. When the radion field is time-independent and the inter-brane spacing is stabilized, the universe can naturally find itself in the radiation-dominated epoch. This feature is 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. In the models considered, if the observable brane has positive tension, a solution to the hierarchy problem requires the presence of a negative tension brane somewhere in the bulk. We find that the string scale can be as low as the electroweak scale. In the situation of self-tuning branes where the bulk cosmological constant is set to zero, the brane tensions have hierarchical values. In the case of a polynomial stabilizing potential no new hierarchy is created.

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V. Barger, T. Han, T. Li, J. D. Lykken, D. Marfatia. 2000-07-27. Cosmology and Hierarchy in Stabilized Warped Brane Models. https://doi.org/10.1016/s0370-2693(00)00877-7

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