Constraints on general second-order scalar-tensor models from gravitational Cherenkov radiation

Rampei Kimura, Kazuhiro Yamamoto

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45 Citations (Scopus)

Abstract

We demonstrate that the general second-order scalar-tensor theories, which have attracted attention as possible modified gravity models to explain the late time cosmic acceleration, could be strongly constrained from the argument of the gravitational Cherenkov radiation. To this end, we consider the purely kinetic coupled gravity and the extended galileon model on a cosmological background. In these models, the propagation speed of tensor mode could be less than the speed of light, which puts very strong constraints from the gravitational Cherenkov radiation.

Original languageEnglish
Article number50
JournalJournal of Cosmology and Astroparticle Physics
Volume2012
Issue number7
DOIs
Publication statusPublished - 2012 Jul 1
Externally publishedYes

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Keywords

  • cosmological perturbation theory
  • gravitational waves / theory
  • Modified gravity

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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