Cosmic inflation in some viable modified models of f(R) gravity of polynomial- exponential form

Abstract

In this paper, we present the cosmic inflation scenario in some viable models of the f(R) modified gravity of polynomial- exponential form. Results show that the magnitude of the parameter β in these viable models is at the order of 5.67x10 -76 , and the time of inflation is at the order 4.6x10 – 35s.