Vainshtein screening in a cosmological background in the most general second-order scalar-tensor theory

Rampei Kimura, Tsutomu Kobayashi, Kazuhiro Yamamoto

Research output: Contribution to journalArticle

108 Citations (Scopus)

Abstract

A generic second-order scalar-tensor theory contains a nonlinear derivative self-interaction of the scalar degree of freedom à la Galileon models, which allows for the Vainshtein screening mechanism. We investigate this effect on subhorizon scales in a cosmological background, based on the most general second-order scalar-tensor theory. Our analysis takes into account all the relevant nonlinear terms and the effect of metric perturbations consistently. We derive an explicit form of Newton's constant, which in general is time-dependent and hence is constrained from observations, as suggested earlier. It is argued that in the most general case the inverse-square law cannot be reproduced on the smallest scales. Some applications of our results are also presented.

Original languageEnglish
Article number024023
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume85
Issue number2
DOIs
Publication statusPublished - Jan 13 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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