Aspects of cosmologies with complete scenario

Abstract

We consider a flat Friedmann–Robertson–Walker (FRW) universe with expansion history based on the Hubble parameter. The Hubble parameter ansatz, by construction, yields the de Sitter-like evolution at early and late-times. The phase transition from accelerated to decelerated era during early times and decelerated to accelerated era in the recent past provide the complete cosmological history of the universe in a natural way. In order to exhibit the dynamical evolution of universe, we explore the inflationary dynamics along with graceful exit, behaviors of cosmological parameters, energy conditions along with behavior in ω−ω′ plane to identify the thawing and freezing regions. Statefinder diagnostic highlights that the universe will evolve to the Λ cold dark matter model during late-times. We also find the scalar field description for the considered Hubble parameter ansatz.