Cosmological evolution via interacting/non-interacting holographic dark energy model for curved FLRW space–time in Rastall gravity

Abstract

Abstract In this work, we explore the phenomenon of cosmic evolution using curved FLRW space–time bounded by apparent horizon with a specific holographic cut-off. To this end, we use the framework of Rastall gravity (RG) and universe is assumed to be consists of interacting/ non-interacting dark energy (DE) and dark matter (DM). In both scenarios, we evaluate exact solutions of the dynamical equations and constraint the holographic parameter c 2 ( z ) assuming a slowly varying function of red-shift during non-interacting model. For interacting model, we consider c 2 as a constant function of red-shift. Moreover, we analyze nature of the obtained results via deceleration parameter ( q ) , statefinder pair ( j , s ) and O m ( z ) -diagnostic by constraining the involved model parameters using latest observational data. The graphical analysis showed that interacting model is very close to Λ cold DM ( Λ CDM) model as compared to non-interacting case. We conclude that this holographic proposal is enough to describe the cosmic evolution at an accelerating rate.