Braneworld Inflation Driven by Dynamics of a Bulk Scalar Field
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概要
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We review a viable alternative scenario of the inflationary universe in the context of the Randall-Sundrum (RS) braneworld. In this scenario, the dynamics of a 5-dimensional scalar field, which we call a bulk scalar field, plays the central role. Focusing on the second (single-brane) RS model, we discuss braneworld inflation driven by a bulk scalar field without introducing an inflaton on the brane. As a toy model, for the bulk scalar field, we consider a minimally coupled massive scalar field in the 5-dimensional spacetime, and look for a perturbative solution of the field equation in the anti-de Sitter background with an inflating brane. For a suitable range of the model parameters, we find a solution that realizes slow-roll inflation on the brane. When the Hubble parameter on the brane and the mass of a bulk scalar field are much smaller than a typical 5-dimensional mass scale, it is found that this proposed inflation scenario reproduces the standard inflation scenario in the 4-dimensional theory.
- 理論物理学刊行会の論文
- 2003-03-28
著者
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SASAKI Misao
Yukawa Institute for Theoretical Physics, Kyoto University
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Sasaki M
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Sasaki Misao
Department Of Earth And Space Science Graduate School Of Science Osaka University
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HIMEMOTO Yoshiaki
Department of Earth and Space Science, Graduate School of Science, Osaka University
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Himemoto Yoshiaki
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Himemoto Yoshiaki
Department Of Earth And Space Science Graduate School Of Science
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SASAKI Misao
Department of Earth and Space Science, Osaka University
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SASAKI Misao
Department of Earth and Space Science, Graduate School of Science Osaka University
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SASAKI Misao
Research Institute for Fundamental Physics, Kyoto University
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SASAKI Misao
Research Institute for Theoretical Physics, Hiroshima University
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SASAKI Misao
Department of Physics, School of Science, University of Tokyo
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