TY - JOUR

T1 - Observational signatures of f(R) dark energy models that satisfy cosmological and local gravity constraints

AU - Tsujikawa, Shinji

PY - 2008/1/11

Y1 - 2008/1/11

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=38049174144&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38049174144&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.77.023507

DO - 10.1103/PhysRevD.77.023507

M3 - Article

AN - SCOPUS:38049174144

VL - 77

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 2

M1 - 023507

ER -