Observational signatures of f(R) dark energy models that satisfy cosmological and local gravity constraints

研究成果: Article査読

313 被引用数 (Scopus)

抄録

We discuss observational consequences of f(R) dark energy scenarios that satisfy local gravity constraints (LGC) as well as conditions of the cosmological viability. The model we study is given by m(r)=C(-r-1)p (C>0, p>1) with m=Rf,RR/f,R and r=-Rf,R/f, which covers viable f(R) models proposed so far in a high-curvature region designed to be compatible with LGC. The equation of state of dark energy exhibits a divergence at a redshift zc that can be as close as a few while satisfying sound horizon constraints of the cosmic microwave background (CMB). We study the evolution of matter density perturbations in detail and place constraints on model parameters from the difference of spectral indices of power spectra between CMB and galaxy clustering. The models with p ≥ 5 can be consistent with those observational constraints as well as LGC. We also discuss the evolution of perturbations in the Ricci scalar R and show that an oscillating mode (scalaron) can easily dominate over a matter-induced mode as we go back to the past. This violates the stability of cosmological solutions, thus posing a problem about how the overproduction of scalarons should be avoided in the early universe.

本文言語English
論文番号023507
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
77
2
DOI
出版ステータスPublished - 2008 1 11
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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