Cosmology of a covariant Galileon field

Antonio De Felice, Shinji Tsujikawa

Research output: Contribution to journalArticlepeer-review

228 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number111301
JournalPhysical Review Letters
Volume105
Issue number11
DOIs
Publication statusPublished - 2010 Sep 7
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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