Cosmic evolution of holographic dark energy in f (Q, T) gravity

Abstract

In this paper, we investigate the dynamic evolution of universe in the models of holographic dark energy with f(Q,T) gravity framework where, Q is the non-metricity scalar and T is the energy-momentum tensor trace. We have considered f(Q,T) = αQ + βT framework and investigated the evolution of cosmological quantities like energy density, equation of state (EoS) parameter and classical stability parameter with redshift. We parameterize the deceleration parameter and confront the Hubble parameter with the observational data. We investigate for the late-time accelerated expansion of universe and discuss the stability of the model by using adiabatic sound speed squared parameter. A comparison among these derived models suggest that the Renyi holographic dark energy model with GO cutoff satisfies the observational constraint of Planck+SNe+BAO on EoS parameter at present time as compared to other models. Diagnostic tools such as Statefinders and Om diagnostic have been used to classify the dark energy evolution regions. © 2023 World Scientific Publishing Company.