Dynamical Evolution of Interacting Modified Chaplygin Gas

TL;DR

This paper studies the dynamical evolution of a cosmological model where modified Chaplygin gas interacts with cold dark matter, revealing stable solutions that address the coincidence problem and analyzing the impact of coupling constants.

Contribution

It introduces a detailed analysis of the interacting modified Chaplygin gas model, highlighting stable scaling solutions and the influence of coupling constants on cosmic evolution.

Findings

Existence of a stable scaling solution alleviating the coincidence problem.

Coupling constants significantly affect the dynamical evolution.

The model can be distinguished from other dark energy models in the $s-r$ plane.

Abstract

The cosmological model of the modified Chaplygin gas interacting with cold dark matter is studied. Our attention is focused on the final state of universe in the model. It turns out that there exists a stable scaling solution, which provides the possibility to alleviate the coincidence problem. In addition, we investigate the effect of the coupling constants $c_{1}$ and $c_{2}$ on the dynamical evolution of this model from the statefinder viewpoint. It is found that the coupling constants play a significant role during the dynamical evolution of the interacting MCG model. Furthermore, we can distinguish this interacting model from other dark energy models in the $s-r$ plane.