Dynamical System Analysis of Modified Chaplygin Gas in Einstein-Aether Gravity

TL;DR

This paper explores the dynamics of Modified Chaplygin Gas as dark energy coupled with dark matter within Einstein-Aether gravity, demonstrating stable solutions and accelerated expansion consistent with observations.

Contribution

It introduces a numerical dynamical system analysis of Modified Chaplygin Gas in Einstein-Aether gravity with interaction, addressing the cosmic coincidence problem.

Findings

Stable scaling solutions are obtained.

The model predicts late-time accelerated expansion.

Background dynamics align with observational data.

Abstract

In this work we investigate the background dynamics when dark energy is coupled to dark matter with a suitable interaction in the universe described by Einstein-Aether gravity. Dark energy in the form of Modified Chaplygin gas is considered. A suitable interaction between dark energy and dark matter is considered in order to at least alleviate (if not solve) the cosmic coincidence problem. The dynamical system of equations is solved numerically and a stable scaling solution is obtained. A significant attempt towards the solution of the cosmic coincidence problem is taken. The statefinder parameters are also calculated to classify the dark energy models. Graphs and phase diagrams are drawn to study the variations of these parameters. It is also seen that the background dynamics of modified Chaplygin gas in Einstein-Aether gravity is completely consistent with the notion of an accelerated expansion in the late universe. Finally, it has been shown that the universe follows the power law form of expansion around the critical point.