Notes on diffeomorphisms symmetry of f(R) gravity in the cosmological context

The European Physical Journal C

Amir Ghalee¹ 

[1] Tafresh University, Tafresh, Iran;

关键词: Perfect Fluid;    Anisotropic Stress;    Cosmological Perturbation;    Cosmological Context;    Modify Gravity Theory;   

DOI  :  10.1140/epjc/s10052-016-3989-9

来源: Springer

【 摘 要 】

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.

【 授权许可】

CC BY