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## “School of Physic”

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Paper   IPM / Physic / 15950
School of Physics
Title:   Superhorizon effects on the gauge invariant effective energy density in f (R) gravity
Author(s):
 1 S. Cheraghchi, 2 F. Shojai
Status:   Published
Journal: Phys. Rev. D
Vol.:  100
Year:  2019
Pages:   103509
Supported by:  IPM
Abstract:
In this article we study the gauge invariant effective energy momentum tensor for cosmological perturbations in f(R) gravity during the inflationary epoch. Considering the super-horizon regime, we derive the effective energy density up to the one-loop corrections. It describes the back-reaction effect of the fluctuations on the background space-time.