Generalized Chaplygin gas and accelerating universe in $f(Q,T)$ gravity

Abstract

The generalized Chaplygin gas (GCG), which has an unusual perfect fluid equation of state, is another promising candidate for dark energy. We investigate the GCG scenario coupled with a baryonic matter in a newly suggested $f(Q,T)$ gravity, an arbitrary function of non-metricity $Q$ and the trace of energy-momentum tensor $T$. We consider the functional form of $f(Q,T)$ as a linear combination of $Q$ and an arbitrary function of $T$, denoted by $h(T)$. Furthermore, we obtain two different functional forms of the $f(Q,T)$ model under high pressure and high-density scenarios of GCG. We also test each model with the recent Pantheon supernovae data set of 1048 data points, Hubble data set of 31 points, and baryon acoustic oscillations. The deceleration parameter is constructed using $OHD+SNeIa+BAO$, predicting a transition from decelerated to accelerated phases of the universe expansion. Also, the equation of state parameter acquires a negative behavior depicting acceleration. Finally, we analyze the statefinder diagnostic to discriminate between the GCG and other dark energy models.

Physics of the Dark Universe published version

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Cited by in corpus (12)

• Phase structure of charged AdS black holes surrounded by exotic fluid with modified Chaplygin equation of state
• Reconstruction of $f(Q,T)$ Lagrangian for various cosmological scenario
• Non-exotic static spherically symmetric thin-shell wormhole solution in $f(Q,T)$ gravity
• Interaction of divergence-free deceleration parameter in Weyl-type $f(Q,T)$ gravity
• Dark energy constraint on equation of state parameter in the Weyl type $f(Q,T)$ gravity
• Effects of the matter Lagrangian degeneracy in $f(Q,T)$ gravity
• Statistical and Observation Comparison of Weyl-Type $f(Q,T)$ Models with the $\Lambda$CDM Paradigm
• Parameterized Deceleration in $f(Q,C)$ Gravity: A Logarithmic Approach
• Revisiting kink-like parametrization and constraints using OHD/Pantheon+/BAO samples
• Testing Gauss-Bonnet Gravity with DESI BAO Data
• Observational Constraints on Chaplygin Gas Models in Non-Minimally Coupled Power Law $f(Q)$ Gravity with Quasars
• Physical Implications and Updated Observational Constraints of the PAge-like Unified Dark Fluid Model