FRW cosmology with the extended Chaplygin gas

TL;DR

This paper explores an extended Chaplygin gas model in cosmology, analyzing its effects on universe expansion, stability, and key parameters through numerical simulations.

Contribution

It introduces an extended Chaplygin gas equation of state that generalizes previous models and studies its cosmological implications numerically.

Findings

The model recovers a quadratic barotropic fluid.

The behavior of scale factor and Hubble parameter is characterized.

The stability of the model is confirmed via density perturbations.

Abstract

In this paper, we propose extended Chaplygin gas equation of state for which it recovers barotropic fluid with quadratic equation of state. We use numerical method to investigate the behavior of some cosmological parameters such as scale factor, Hubble expansion parameter, energy density and deceleration parameter. We also discuss about the resulting effective equation of state parameter. Using density perturbations we investigate the stability of the theory.