Some diagnostic analysis of dark energy models with $q(z)$ parametrizations

Abstract

The presented paper represents some diagnostic analysis of three dark energy models resulting from the parametrization of the deceleration parameter. All the considered models are interesting as they show intriguing features, such as the late-time acceleration and cosmological phase transition from early deceleration to late acceleration. We use $q(z)$ parametrizations and found the best fitting values of the model parameters by constraining the models with Hubble datasets and Union 2.1 compilation Type Ia supernovae datasets. The evolution of some cosmological parameters is discussed. We aim to discuss the statefinder diagnostic analysis of the considered models and compare it with the $\Lambda$CDM and SCDM models. Moreover, we have performed the Om diagnostics for the models.Comment: 11 pages, 6 figure