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Paper   IPM / Physic / 8507
School of Physics
  Title:   Consistency of f(R)=√{R2R02} Gravity with the Cosmological Observations in the Palatini Formalism
  Author(s): 
1.  M. S. Movahed
2.  S. Baghram
3.  S. Rahvar
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  76
  Year:  2007
  Pages:   044008
  Supported by:  IPM
  Abstract:
In this work we study the dynamics of universe in f(R)=√{R2R02} modified gravity with Palatini formalism. We use data from recent observations as Supernova Type Ia (SNIa) Gold sample and Supernova Legacy Survey (SNLS) data, size of baryonic acoustic peak from Sloan Digital Sky Survey (SDSS), the position of the acoustic peak from the CMB observations and large scale structure formation (LSS) from the 2dFGRS survey to put constraint on the parameters of the model. To check the consistency of this action, we compare the age of old cosmological objects with the age of universe. In the combined analysis with the all the observations, we find the parameters of model as R0=6.192−0.177+0.167×H02 and Ωm=0.278−0.278+0.273.

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