Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-07-22
Phys.Rev.D78:083515,2008
Physics
High Energy Physics
High Energy Physics - Theory
16 pages and 9 figures, typos corrected, few references and minor clarifications added, revised version to appera in PRD
Scientific paper
10.1103/PhysRevD.78.083515
We study the $f(R)$ theory of gravity using metric approach. In particular we investigate the recently proposed model by Hu-Sawicki, Appleby $-$ Battye and Starobinsky. In this model, the cosmological constant is zero in flat space time. The model passes both the Solar system and the laboratory tests. But the model parameters need to be fine tuned to avoid the finite time singularity recently pointed in the literature. We check the concordance of this model with the $H(z)$ and baryon acoustic oscillation data. We find that the model resembles the $\Lambda$CDM at high redshift. However, for some parameter values there are variations in the expansion history of the universe at low redshift.
Dev Abha
Jain Deepak
Jhingan Sanjay
Nojiri Shin'ich
Sami M.
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