Crossing w=-1 in Gauss-Bonnet Brane World with Induced Gravity

Details Crossing w=-1 in Gauss-Bonnet Brane World with Induced Gravity Crossing w=-1 in Gauss-Bonnet Brane World with Induced Gravity

2005-05-21

arxiv.org/abs/hep-th/0505186v2

Commun.Theor.Phys.44:948,2005

Physics

High Energy Physics

High Energy Physics - Theory

Revtex 16 pages including 10 eps files, references added, to appear in Comm. Theor. Phys

Scientific paper

Recent type Ia supernovas data seemingly favor a dark energy model whose equation of state $w(z)$ crosses -1 very recently, which is a much more amazing problem than the acceleration of the universe. In this paper we show that it is possible to realize such a crossing without introducing any phantom component in a Gauss-Bonnet brane world with induced gravity, where a four dimensional curvature scalar on the brane and a five dimensional Gauss-Bonnet term in the bulk are present. In this realization, the Gauss-Bonnet term and the mass parameter in the bulk play a crucial role.

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