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

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.

Automated summary

This paper discusses a hybrid model named viscous generalized Chaplygin gas (VGCG) constructed through a generalized Chaplygin gas and bulk viscosity, with its free parameters constrained by cosmological data and Joint Bayesian analysis. The results show significant differences in dynamics and comparison with the standard cosmological model. The VGCG is identified as a potential candidate to alleviate the well-known Hubble constant tension based on the Joint analysis.