Model parameters in the context of late time cosmic acceleration in $f(Q,T)$ gravity

TL;DR

This paper explores the dynamics of accelerating cosmological models within the extended f(Q,T) gravity framework, analyzing two functional forms and their potential as alternatives to dark energy using a hybrid scale factor.

Contribution

It introduces and investigates two specific functional forms of f(Q,T) gravity for modeling late-time cosmic acceleration, offering a geometric alternative to dark energy.

Findings

Models can produce viable cosmic acceleration scenarios.

Parameter space analysis shows conditions for acceleration.

Models serve as potential geometrical alternatives to dark energy.

Abstract

The dynamical aspects of some accelerating models are investigated in the framework of an extension of symmetric teleparllel gravity dubbed as f(Q,T) gravity. In this gravity theory, the usual Ricci tensor in the geometrical action is replaced by a functional f(Q,T) where Q is the non-metricity and T is the trace of the energy-momentum tensor. Two different functional forms are considered in the present work. In order to model the Universe, we have considered a signature flipping deceleration parameter simulated by a hybrid scale factor (HSF). The dynamical parameters of the model are derived and analysed. We discuss the role of the parameter space in getting viable cosmological models. It is found that, the models may be useful as suitable geometrical alternatives to the usual dark energy approach.