Cosmic acceleration from asymmetric branes

Details Cosmic acceleration from asymmetric branes Cosmic acceleration from asymmetric branes

2004-06-18

arxiv.org/abs/hep-th/0406157v3

Class.Quant.Grav. 22 (2005) 681-694

Physics

High Energy Physics

High Energy Physics - Theory

Version appearing in CQG

Scientific paper

10.1088/0264-9381/22/4/003

We consider a single 3-brane sitting in between two different five dimensional spacetimes. On each side of the brane, the bulk is a solution to Gauss-Bonnet gravity, although the bare cosmological constant, funda mental Planck scale, and Gauss-Bonnet coupling can differ. This asymmetry leads to weighted junction conditions across the brane and interesting brane cosmology. We focus on two special cases: a generalized Randall-Sundrum model without any Gauss-Bonnet terms, and a stringy model, without any bare cosmological constants, and positive Gauss-Bonnet coupling. Even though we assume there is no vacuum energy on the brane, we find late time de Sitter cosmologies can occur. Remarkably, in certain parameter regions, this acceleration is preceded by a period of matter/radiation domination, with $H^2 \propto \rho$, all the way back to nucleosynthesis.

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