Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-18
Phys.Rev.D75:044004,2007
Astronomy and Astrophysics
Astrophysics
10 pages, 6 figures, minor typo fixes reflects version accepted by PRD
Scientific paper
10.1103/PhysRevD.75.044004
We study the evolution of linear cosmological perturbations in f(R) models of accelerated expansion in the physical frame where the gravitational dynamics are fourth order and the matter is minimally coupled. These models predict a rich and testable set of linear phenomena. For each expansion history, fixed empirically by cosmological distance measures, there exists two branches of f(R) solutions that are parameterized by B propto d^2 f/dR^2. For B<0, which include most of the models previously considered, there is a short-timescale instability at high curvature that spoils agreement with high redshift cosmological observables. For the stable B>0 branch, f(R) models can reduce the large-angle CMB anisotropy, alter the shape of the linear matter power spectrum, and qualitatively change the correlations between the CMB and galaxy surveys. All of these phenomena are accessible with current and future data and provide stringent tests of general relativity on cosmological scales.
Hu Wayne
Sawicki Ignacy
Song Yong-Seon
No associations
LandOfFree
The Large Scale Structure of f(R) Gravity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Large Scale Structure of f(R) Gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Large Scale Structure of f(R) Gravity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-98925