Affine EoS cosmologies: Observational and dynamical system constraints

Abstract

Within the framework of homogeneous and isotropic metric having flat spatial sections, we show that the accelerating universe expansion phenomena may be addressed with the dark fluid satisfying affine equation of state (EoS). The constraints on model parameters are presented by utilizing the late-times cosmic observational data and dynamical system perspectives. The late-time constraints on the model parameters are placed by using the Bayesian Monte Carlo method analysis. The dynamical system constraints are imposed by using the linear stability theory. We further analyze the behavior of cosmographic parameters, statefinder diagnostic and the energy conditions to explore different features of the universe in model. The cosmological parameters with the best fit values suggest that the universe is expanding with acceleration, classically stable and free from the finite-time future singularities.