Gradient Expansion Approach to Nonlinear Superhorizon Perturbations. II : A Single Scalar Field(Astrophysics and Relativity)
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概要
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We formulate nonlinear perturbations of a scalar field dominated universe on super-horizon scales. We consider the case of a single scalar field. We employ the gradient expansion approach. We adopt the uniform Hubble slicing and derive the general solution valid to O(ε^2), where ε is the expansion parameter associated with a spatial derivative, which includes both the scalar and tensor modes. In particular, the O(ε^2) correction terms to the nonlinear curvature perturbation, which are important in models with a non-slowroll stage during inflation, are explicitly obtained.
- 理論物理学刊行会の論文
- 2007-09-25
著者
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SASAKI Misao
Yukawa Institute for Theoretical Physics, Kyoto University
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Sasaki Misao
Yukawa Institute For Theoretical Physics Kyoto University
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TANAKA Yoshiharu
Yukawa Institute for Theoretical Physics, Kyoto University
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Tanaka Yoshiharu
Yukawa Institute For Theoretical Physics Kyoto University
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SASAKI Misao
Yukawa Institute for Theoretical Physics, Kyoto University:Korea Institute for Advanced Study
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