Observational constraints on Galileon cosmology

Savvas Nesseris*, Antonio De Felice, Shinji Tsujikawa

*この研究の対応する著者

研究成果: Article査読

123 被引用数 (Scopus)

抄録

We study the cosmology of a covariant Galileon field φ with five covariant Lagrangians and confront this theory with the most recent cosmological probes: the type Ia supernovae data (Constitution and Union2 sets), cosmic microwave background (WMAP7), and the baryon acoustic oscillations (SDSS7). In the Galileon cosmology with a late-time de Sitter attractor, there is a tracker that attracts solutions with different initial conditions to a common trajectory. Including the cosmic curvature K, we place observational constraints on two distinct cases: (i) the tracker, and (ii) the generic solutions to the equations of motion. We find that the tracker solution can be consistent with the individual observational data, but it is disfavored by the combined data analysis. The generic solutions fare quite well when a nonzero curvature parameter ΩK(0) is taken into account, but the Akaike and Bayesian information criteria show that they are not particularly favored over the ΛCDM model.

本文言語English
論文番号124054
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
82
12
DOI
出版ステータスPublished - 2010
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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