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gr-qc2023
Trans-Planckian Effect in Cosmology
S. Cheraghchi, F. Shojai, M. H. Abbassi
Apart from the assumption that the inflation started at an infinite time in the past, the more realistic initial state of the quantum fluctuations is described by a mixed quantum s…
gr-qc2019★ 1 cited
Super-horizon effects on the gauge invariant effective energy density in f(R) gravity
S. Cheraghchi, F. Shojai
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-ho…
gr-qc2018
On the initial conditions of scalar and tensor fluctuations in gravity
S. Cheraghchi, F. Shojai
We have considered the perturbation equations governing the growth of fluctuations in generalized scalar tensor theory during inflation. we have found that the scalar metric pertur…