Built-in inflation in f(G) gravity

摘要

In this paper, we study the role of Gauss-Bonnet term for the early and late time accelerating phases of the universe with the help of two viable f(G) models in the background of flat FRW universe model. These models show inflationary behavior as well as the present accelerating expansion of the universe. The contribution of Gauss-Bonnet term in pressure and energy density is used to calculate equation of state (EoS) parameter for the modified fluid which behaves like cosmological constant with (H) over dot = 0. We discuss early inflation and late accelerating expansion of the universe through scale factor evaluated from equation of continuity numerically.