Solving the Hierarchy Problem in Two-Brane Cosmological Models

Details Solving the Hierarchy Problem in Two-Brane Cosmological Models Solving the Hierarchy Problem in Two-Brane Cosmological Models

2000-05-15

arxiv.org/abs/hep-ph/0005146v2

Phys.Rev.D62:126004,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, Latex file, 1 figure, some comments, clarifications and a reference added, typos corrected, version to appear in Phy

Scientific paper

10.1103/PhysRevD.62.126004

We analyze cosmological solutions in the class of two-brane models with arbitrary tensions which contain matter with general equations of state. We show that the mass hierarchy between the two branes is determined by the ratio of the lapse functions evaluated on the branes. This ratio can be sufficiently small without fine-tuning the brane separation, once the transverse dimension is stabilized. For suitably large interbrane separations, both brane tensions are positive. We also find that the cosmological evolution obeys the standard four-dimensional Friedman equation up to small corrections.

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