Effective field theory approach to modified gravity including Horndeski theory and Hořava-Lifshitz gravity

Ryotaro Kase, Shinji Tsujikawa

研究成果: Article査読

45 被引用数 (Scopus)

抄録

In this paper, we review the effective field theory of modified gravity in which the Lagrangian involves three-dimensional geometric quantities appearing in the 3+1 decomposition of spacetime. On the flat isotropic cosmological background, we expand a general action up to second-order in the perturbations of geometric scalars, by taking into account spatial derivatives higher than two. Our analysis covers a wide range of gravitational theories - including Horndeski theory/its recent generalizations and the projectable/nonprojectable versions of Hořava-Lifshitz gravity. We derive the equations of motion for linear cosmological perturbations and apply them to the calculations of inflationary power spectra as well as the dark energy dynamics in Galileon theories. We also show that our general results conveniently recover stability conditions of Hořava-Lifshitz gravity already derived in the literature.

本文言語English
論文番号1443008
ジャーナルInternational Journal of Modern Physics D
23
13
DOI
出版ステータスPublished - 2014 11 16
外部発表はい

ASJC Scopus subject areas

  • 数理物理学
  • 天文学と天体物理学
  • 宇宙惑星科学

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