Exact Global Solutions of Brane Universes and Big Bounce

Details Exact Global Solutions of Brane Universes and Big Bounce Exact Global Solutions of Brane Universes and Big Bounce

2002-06-21

arxiv.org/abs/hep-th/0206198v4

Phys.Lett. B560 (2003) 149-154

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, one figure, minor changes, to appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(03)00394-0

Exact global solutions of five-dimensional cosmological models compactified on a $S_1/Z_2$ orbifold with two 3-branes are presented, and evolution of a simple model is studied. It is found that on all 4D spacetime hypersurfaces, except a singular one, the expanding universe was started not from a big bang but from a big bounce, and before the bounce the universe was in a deflationary contracting phase. It is also found that whether the energy density on the second brane is positive, zero, or negative depends on the size of the fifth dimension.

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