Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-09-17
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
22 pages, 9 figures, LaTeX
Scientific paper
We investigate the cosmological and the local tests of the f(R) theory of modified gravity via the observations of (1) the cosmic expansion and (2) the cosmic structures and via (3) the solar-system experiments. To fit the possible cosmic expansion histories under consideration, for each of them we reconstruct f(R), known as "designer f(R)". We then test the designer f(R) via the cosmic-structure constraints on the metric perturbation ratio Psi/Phi and the effective gravitational coupling G_eff and via the solar-system constraints on the Brans-Dicke theory with the chameleon mechanism. We find that among the designer f(R) models specified by the CPL effective equation of state w_eff, only the model closely mimicking general relativity with a cosmological constant (LambdaCDM) can survive all the tests. Accordingly, these tests rule out the frequently studied "w_eff = -1" designer f(R) models which are distinct in cosmic structures from LambdaCDM. When considering only the cosmological tests, we find that the surviving designer f(R) models, although exist for a variety of w_eff, entail fine-tuning.
Chen Pisin
Gu Je-An
Lin Wei-Ting
No associations
LandOfFree
Cosmological and Solar-System Tests of f(R) Modified 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 Cosmological and Solar-System Tests of f(R) Modified Gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological and Solar-System Tests of f(R) Modified Gravity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-442796