Crossing w=1 in Gauss-Bonnet Brane World with Induced Gravity |
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| Authors: | CAI Rong-Gen ZHANG Hong-Sheng WANG An-Zhong |
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| Affiliation: | 1. Institute of Theoretical Physics, the Chinese Academy of Sciences, P.O. Box 2735, Beijing 100080, China;2. CASPER, Department of Physics, Baylor University, 101Bagby Avenue, Waco, TX 76706, USA |
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| Abstract: | Recent type Ia supernovas data seemingly favor a dark energy modelwhose 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 realizesuch a crossing without introducing any phantom component in aGauss-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 acrucial role. |
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| Keywords: | dark energy brane world scenario phantom divide |
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