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

Baghram, S ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevD.80.064003
  3. Publisher: 2009
  4. Abstract:
  5. In this work we propose a modified gravity action f(R)=(Rn-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=0.98-0.08+0.08 and ΩM=0.25+0.1-0.1 with one sigma level of confidence where a standard ΛCDM universe resides in this range of solution. © 2009 The American Physical Society
  6. Keywords:
  8. Source: Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 80, Issue 6 , 2009 ; 15507998 (ISSN)
  9. URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.80.064003