Observational tests of a two parameter power-law class modified gravity in Palatini formalism

2009/04/30 by Shant Baghram, M. Sadegh Movahed, S. Rahvar +1
Physics and Astronomy · #Astrophysics #Baryon #Baryon acoustic oscillations #Black Holes and Theoretical Physics #Cosmic microwave background #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Lambda #Mathematical physics #Omega #Physics #Quantum mechanics #Shape of the universe #Theoretical physics #Universe #astro-ph.CO

paper · pdf · doi:10.1103/physrevd.80.064003

published as Phys.Rev.D80:064003,2009 · 16 pages, 17 figures

openalex publication_date 2009/09/01 · arxiv created 2009/09/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

CONTEXT: In this work we propose a modified gravity action f(R)=(Rⁿ\ensuremath-R₀ⁿ)^1/n with two free parameters of n and R₀ 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_\ensuremath-0.08^+0.08 and \ensuremathΩ_M=0.25_+0.1^\ensuremath-0.1 with one sigma level of confidence where a standard \ensuremathΛCDM universe resides in this range of solution.

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