A Dynamical System Analysis of cosmic evolution with coupled phantom dark energy with dark matter

TL;DR

This paper applies dynamical system analysis to a cosmological model with interacting phantom dark energy and dark matter, revealing stability properties and phase transitions in cosmic evolution.

Contribution

It introduces a novel dynamical system framework for analyzing coupled phantom dark energy and dark matter with bifurcation analysis in cosmology.

Findings

Identification of stable and unstable critical points.

Detection of cosmological phase transitions via bifurcation analysis.

Application of center manifold theory to stability analysis.

Abstract

The present work is an example of the application of the dynamical system analysis in the context of cosmology. Here cosmic evolution is considered in the background of homogeneous and isotropic flat Friedmann-Lema\^{i}tre-Robertson-Walker space-time with interacting dark energy and varying mass dark matter as the matter content. The Dark Energy (DE) is chosen as phantom scalar field with self-interacting potential while the Dark Matter (DM) is in the form of dust. The potential of the scalar field and the mass function of dark matter are chosen as exponential or power-law form or in their product form. Using suitable dimensionless variables the Einstein field equations and the conservation equations constitute an autonomous system. The stability of the non-hyperbolic critical points are analyzed by using center manifold theory. Finally, cosmological phase transitions have been detected through bifurcation analysis which has been done by Poincar\'{e} index theory.