Cosmology of a covariant Galileon field

Antonio De Felice*, Shinji Tsujikawa

*この研究の対応する著者

研究成果: Article査読

240 被引用数 (Scopus)

抄録

We study the cosmology of a covariant scalar field respecting a Galilean symmetry in flat space-time. We show the existence of a tracker solution that finally approaches a de Sitter fixed point responsible for cosmic acceleration today. The viable region of model parameters is clarified by deriving conditions under which ghosts and Laplacian instabilities of scalar and tensor perturbations are absent. The field equation of state exhibits a peculiar phantomlike behavior along the tracker, which allows a possibility to observationally distinguish the Galileon gravity from the cold dark matter model with a cosmological constant.

本文言語English
論文番号111301
ジャーナルPhysical Review Letters
105
11
DOI
出版ステータスPublished - 2010 9月 7
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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