Regular Article - Theoretical Physics
Notes on diffeomorphisms symmetry of f(R) gravity in the cosmological context
Tafresh University, Tafresh, Iran
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Accepted: 29 February 2016
Published online: 11 March 2016
We study the metric perturbations in the context of restricted f(R) gravity, in which a parameter for deviation from the full diffeomorphisms of space-time is introduced. We demonstrate that one can choose the parameter to remove the induced anisotropic stress, which is present in the usual f(R) gravity. Moreover, to prevent instability for the vector and tensor metric perturbations, some constraints on the restricted f(R) gravity are obtained.
© The Author(s), 2016