Conditions for the cosmological viability of the most general scalar-tensor theories and their applications to extended Galileon dark energy models

Antonio De Felice*, Shinji Tsujikawa

*この研究の対応する著者

研究成果: Article査読

171 被引用数 (Scopus)

抄録

In the Horndeski's most general scalar-tensor theories with second-order field equations, we derive the conditions for the avoidance of ghosts and Laplacian instabilities associated with scalar, tensor, and vector perturbations in the presence of two perfect fluids on the flat Friedmann-Lematre-Robertson- Walker (FLRW) background. Our general results are useful for the construction of theoretically consistent models of dark energy. We apply our formulas to extended Galileon models in which a tracker solution with an equation of state smaller than -1 is present. We clarify the allowed parameter space in which the ghosts and Laplacian instabilities are absent and we numerically confirm that such models are indeed cosmologically viable.

本文言語English
論文番号007
ジャーナルJournal of Cosmology and Astroparticle Physics
2012
2
DOI
出版ステータスPublished - 2012 2月
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学

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