The effect of modified gravity on weak lensing

Shinji Tsujikawa, Takayuki Tatekawa*

*この研究の対応する著者

研究成果: Article査読

57 被引用数 (Scopus)

抄録

We study the effect of modified gravity on weak lensing in a class of scalar-tensor theory that includes f (R) gravity as a special case. These models are designed to satisfy local gravity constraints by having a large scalar-field mass in a region of high curvature. Matter density perturbations in these models are enhanced at small redshifts because of the presence of a coupling Q that characterizes the strength between dark energy and non-relativistic matter. We compute a convergence power spectrum of weak lensing numerically and show that the spectral index and the amplitude of the spectrum in the linear regime can be significantly modified compared to the ΛCDM model for large values of | Q | of the order of unity. Thus weak lensing provides a powerful tool to constrain such large coupling scalar-tensor models including f (R) gravity.

本文言語English
ページ(範囲)325-331
ページ数7
ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
665
5
DOI
出版ステータスPublished - 2008 7月 31
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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