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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Institution: | 1. Institute of Theoretical Physics, the Chinese Academy of Sciences, P.O. Box 2735, Beijing 100080, China
;2. CASPER, Department of Physics, Baylor University, 101
Bagby Avenue, Waco, TX 76706, USA |
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Abstract: | 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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Keywords: | dark energy brane world scenario phantom divide |
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