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

Communications in Theoretical Physics 2005年第5X期44卷 948-954页

作者： CAI Rong-Gen ZHANG Hong-Sheng WANG An-Zhong Institute of Theoretical Physics the Chinese Academy of Sciences P.O. Box 2735 Beijing 100080 China CASPER Department of Physics Baylor University 101 Bagby Avenue Waco TX 76706 USA

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 worm with induced gravity, where a four-dimensional curvature scalar on the brahe and a five-dimensional Gauss-Bonnet term in the bu/k are present. In this realization, the Gauss-Bonnet term and the mass parameter in the bulk play a crucial role.

关键词： dark energy brane world scenario phantom divide

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Fluctuation with dust of de Sitter ground state of scalar-tensor gravity

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Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 411-417页

作者： TANG YanKe ZHANG HongSheng CHEN ChiYi LI XinZhou Department of Physics Dezhou University Shandong Provincial Key Laboratory of Functional Macromolecular Biophysics Dezhou University Center for Astrophysics Shanghai Normal University State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Hangzhou Normal University Shanghai United Center for Astrophysics Shanghai Normal University

An exact de Sitter solution of scalar-tensor gravity is found in our recent work, in which the non-minimal coupling scalar is rolling along a non-constant potential. Based on this solution, a dust-filled FRW universe is explored in frame of scalar-tensor gravity in this article. The effective dark energy induced by the sole non-minimal scalar can be quintessence-like, phantom-like, and more significantly, can cross the phantom divide. The rich and varied properties of scalar-tensor gravity even with only one scalar is shown.

关键词： scalar tensor gravity de Sitter space dark energy phantom divide

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

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Communications in Theoretical Physics 2005年第11期 948-954页

作者： CAI Rong-Gen~1 ZHANG Hong-Sheng~1 WANG An-Zhong~21 Institute of Theoretical Physics,the Chinese Academy of Sciences,P.O.Box 2735,Beijing 100080,China2 CASPER,Department of Physics,Baylor University,101 Bagby Avenue,Waco,TX 76706,USA Institute of Theoretical Physics the Chinese Academy of Sciences P.O. Box 2735 Beijing 100080 China CASPER Department of Physics Baylor University 101 Bagby Avenue Waco TX 76706 USA

Recent type Ia supernovas data seemingly favor a dark energy model whose equation of state ω(z)crosses-1 very recently,which is a much more amazing problem than the acceleration of the *** this paper we showthat it is possible to realize such a crossing without introducing any phantom component in a Gauss-Bonnet brane worldwith induced gravity,where a four-dimensional curvature scalar on the brahe and a five-dimensional GaussBonnet termin the bulk are *** this realization,the Gauss-Bonnet term and the mass parameter in the bulk play a crucialrole.

关键词： dark energy brahe world scenario phantom divide

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