Possibility of realizing weak gravity in redshift space distortion measurements

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31 Citations (Scopus)

Abstract

We study the possibility of realizing a growth rate of matter density perturbations lower than that in general relativity. Using the approach of the effective field theory of modified gravity encompassing theories beyond Horndeski, we derive the effective gravitational coupling Geff and the gravitational slip parameter η for perturbations deep inside the Hubble radius. In Horndeski theories we derive a necessary condition for achieving weak gravity associated with tensor perturbations, but this is not a sufficient condition due to the presence of a scalar-matter interaction that always enhances Geff. Beyond the Horndeski domain it is possible to realize Geff smaller than Newton's gravitational constant G, while the scalar and tensor perturbations satisfy no-ghost and stability conditions. We present a concrete dark energy scenario with varying ct and numerically study the evolution of perturbations to confront the model with the observations of redshift-space distortions and weak lensing.

Original languageEnglish
Article number044029
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number4
DOIs
Publication statusPublished - 2015 Aug 18
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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