Observational tests of a two parameter power-law class modified gravity in Palatini formalism
- Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran (Iran, Islamic Republic of)
- Department of Physics, Shahid Beheshti university, G.C., Evin, Tehran 19839 (Iran, Islamic Republic of)
CONTEXT: In this work we propose a modified gravity action f(R)=(R{sup n}-R{sub 0}{sup n}){sup 1/n} with two free parameters of n and R{sub 0} and derive the dynamics of a universe for this action in the Palatini formalism. AIM: We do a cosmological comparison of this model with observed data to find the best parameters of a model in a flat universe. METHOD: To constrain the free parameters of model we use SNIa type Ia data in two sets of gold and union samples, CMB-shift parameter, baryon acoustic oscillation, gas mass fraction in cluster of galaxies, and large-scale structure data. RESULT: The best fit from the observational data results in the parameters of model in the range of n=0.98{sub -0.08}{sup +0.08} and {omega}{sub M}=0.25{sub +0.1}{sup -0.1} with one sigma level of confidence where a standard {lambda}CDM universe resides in this range of solution.
- OSTI ID:
- 21322716
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevD.80.064003; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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