Cosmological perturbations in general modified gravity theories

Shinji Tsujikawa, Antonio De Felice, Shinji Mukohyama

研究成果: Article査読

抄録

We derive the equations of linear cosmological perturbations for the general Lagrangian density f(R, φ,X)/2+Lc, where R is a Ricci scalar, φ is a scalar field, and X = - δμφδμφ/2 is a field kinetic energy. We take into account a nonlinear self-interaction term Lc = ξ(φ)φ(δμφδμφ), which keeps the field equations at second order. Taking into account a scalar-field mass explicitly, the equations of matter density perturbations and gravitational potentials are obtained under a quasi-static approximation on sub-horizon scales. We also derive conditions for the avoidance of ghosts and Laplacian instabilities associated with propagation speeds.

本文言語English
ページ(範囲)188-196
ページ数9
ジャーナルProgress of Theoretical Physics Supplement
190
DOI
出版ステータスPublished - 2011
外部発表はい

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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