A hybrid model of viscous and Chaplygin gas to tackle the Universe acceleration

Abstract

Motivated by two seminal models proposed to explain the Universe acceleration, this paper is devoted to study a hybrid model which is constructed through a generalized Chaplygin gas with the addition of a bulk viscosity. We call the model a Viscous Generalized Chaplygin Gas (VGCG) and its free parameters are constrained through several cosmological data like the Observational Hubble Parameter, Type Ia Supernovae, Baryon Acoustic Oscillations, Strong Lensing Systems, HII Galaxies and using Joint Bayesian analysis. In addition, we implement a Om-diagnostic to analyze the VGCC dynamics and its difference with the standard cosmological model. The hybrid model shows important differences when compared with the standard cosmological model. Finally, based on our Joint analysis we find that the VGCG could be an interesting candidate to alleviate the well-known Hubble constant tension.

Accepted for publication in EPJC

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• Revisiting Chaplygin gas cosmologies with the recent observations of high-redshfit quasars
• Can the Hubble tension be resolved by bulk viscosity?
• Cosmology with viscous generalized Chaplygin gas in $f(Q)$ gravity
• A new Parametrization for Bulk Viscosity Cosmology as Extension of the $\Lambda$CDM Model
• Study of a viscous $\Lambda$WDM model: Near equilibrium condition, entropy production, and cosmological constraints
• Variable Chaplygin Gas: Constraints from Supernovae, GRB and Gravitational Wave Merger Events
• Late time cosmological solutions in $f(R,T)$ gravity in a viscous Universe