Cosmology with viscous generalized Chaplygin gas in f(Q) gravity

We use the hybrid model of bulk viscosity and generalized chap-lygin gas (GCG), named the viscous generalized chaplygin gas (VGCG) model, which is thought to be an alternate dark fluid of the universe. We explore the dynamics of the VGCG model in the framework of the non-metricity f(Q) gravity using the functional form f(Q) = /3Qn, where /3 and n are arbitrary constants. For the purpose of constraining model parameters, we use recent observational datasets such as Observational Hubble data, Baryon Acoustic Oscillations, and Type Ia supernovae data. According to our study, the evolution of the deceleration parameter q and the equation of state (EoS) parameter w shows a transition from deceleration to an acceleration phase and its deviation from the ?CDM model. (c) 2023 Elsevier Inc. All rights reserved.

Automated summary

In this study, we use the viscous generalized Chaplygin gas (VGCG) model, which is a hybrid model of bulk viscosity and generalized Chaplygin gas, as an alternate dark fluid of the universe. We investigate the dynamics of the VGCG model in the non-metricity gravity framework using a functional form f(Q) = /3Qn, with /3 and n being arbitrary constants. To constrain model parameters, we utilize observational datasets such as Observational Hubble data, Baryon Acoustic Oscillations, and Type Ia supernovae data. Our results show a transition from deceleration to an acceleration phase in the evolution of the deceleration parameter q and the equation of state (EoS) parameter w, with deviations from the ΛCDM model.