Observational Constraints on Exponential Gravity
Cosmology and Nongalactic Astrophysics
2010-12-13 v1 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
We study the observational constraints on the exponential gravity model of f(R)=-beta*Rs(1-e^(-R/Rs)). We use the latest observational data including Supernova Cosmology Project (SCP) Union2 compilation, Two-Degree Field Galaxy Redshift Survey (2dFGRS), Sloan Digital Sky Survey Data Release 7 (SDSS DR7) and Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP7) in our analysis. From these observations, we obtain a lower bound on the model parameter beta at 1.27 (95% CL) but no appreciable upper bound. The constraint on the present matter density parameter is 0.245< Omega_m^0<0.311 (95% CL). We also find out the best-fit value of model parameters on several cases.
Keywords
Cite
@article{arxiv.1010.2058,
title = {Observational Constraints on Exponential Gravity},
author = {Louis Yang and Chung-Chi Lee and Ling-Wei Luo and Chao-Qiang Geng},
journal= {arXiv preprint arXiv:1010.2058},
year = {2010}
}
Comments
14pages, 3 figures, accepted by PRD