The effect of modified gravity on weak lensing

2008/04/30 by Shinji Tsujikawa, Takayuki Tatekawa · 68 citations
Mathematics · Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Curvature #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Geometry #Gravitational lensing formalism #Mathematical physics #Mathematics #Physics #Quantum #Quantum gravity #Quantum mechanics #Redshift #Scalar (mathematics) #Spectral density #Spectral index #Spectral line #Strong gravitational lensing #Tensor (intrinsic definition) #Weak gravitational lensing #astro-ph #f(R) gravity #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1016/j.physletb.2008.06.052

published in Physics Letters B 665(5), 325-331 (Elsevier BV) · 8 pages including 3 figures. Submitted to Physics Letters B

openalex publication_date 2008/06/28 · arxiv created 2008/08/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

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.

Citations

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