Cosmic Acceleration and Stability of Kaluza-Klein Universe in f (Q, T) Gravity
Abstract
The f (Q, T) gravity has been used in this research to study Kaluza-Klein universe in presence of macroscopic body. In this theory of gravity, the action contains an arbitrary function f (Q, T) where Q and T respectively denote the non-metricity and the trace of energy momentum tensor. The linear and additive form of f (Q, T) gravity, f (Q, T) =αQ+βT where α and β are arbitrary constants, is taken into account in this work. To achieve a physically viable solution of the field equations, we have considered power law and exponential expansion law. We investigate the evolving character of the universe with physical and geometrical properties within this theoretical framework. To enhance clarity, statefinder diagnostic and EoS parameter are examined, to characterize different phases of the universe. The energy conditions of the models are also analyzed and found to be consistent with recent cosmological observations. Besides, one of our models inherently allows a phantom region for dark energy. Further the models examined in this work are confirmed through stability analysis.
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