Second-order matter density perturbations and skewness in scalar-tensor modified gravity models

Material type: 文書・図像類

Author: TATEKAWA, Takayukiほか

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Publication date: 2008-09

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Note (General)：: We study second-order cosmological perturbations in scalar?tensor models of dark energy that satisfy local gravity constraints, including f(R) gravity...

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Material Type: 文書・図像類
Title: Second-order matter density perturbations and skewness in scalar-tensor modified gravity models
Author/Editor: TATEKAWA, Takayuki
TSUJIKAWA, Shinji
Author Heading: TATEKAWA, Takayuki
TSUJIKAWA, Shinji
Publication Date: 2008-09
Publication Date (W3CDTF): 2008-09
Periodical title: Journal of cosmology and astroparticle physics
No. or year of volume/issue: 2008 9
Volume: 2008
Issue: 9
Pages: 9-
ISSN (Periodical Title): ISSN : 1475-7516
Text Language Code: eng
Subject Heading: cosmological perturbation theory
dark energy theory
Target Audience: 一般
Note (General): We study second-order cosmological perturbations in scalar?tensor models of dark energy that satisfy local gravity constraints, including f(R) gravity. We derive equations for matter fluctuations under a sub-horizon approximation and clarify conditions under which first-order perturbations in the scalar field can be neglected relative to second-order matter and velocity perturbations. We also compute the skewness of the matter density distribution and find that the difference from the ΛCDM (CDM: cold dark matter) model is less than a few per cent even if the growth rate of first-order perturbations is significantly different from that in the ΛCDM model. This shows that the skewness provides a model-independent test for the picture of gravitational instability from Gaussian initial perturbations including scalar?tensor modified gravity models.
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ