Brane World Cosmology Without the Z_2 Symmetry

Details Brane World Cosmology Without the Z_2 Symmetry Brane World Cosmology Without the Z_2 Symmetry

2000-08-14

arxiv.org/abs/hep-ph/0008132v2

Phys.Lett.B504:254-261,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX, 13 pages. Previous version has been split into two papers. The other part is now hep-ph/0012223

Scientific paper

10.1016/S0370-2693(01)00291-X

The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z_2 symmetry of the metric itself is derived, and the possible effects of dropping the Z_2 symmetry on the expansion of our Universe are examined; cosmological constraints are discussed. The global solutions for the metric in the infinite extra dimension case are found and comparison with the symmetric case is made. We show that any brane world senario of this type must revert to a Z_2 symmetric form at late times, and hence rule out certain proposed scenarios.

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