A New Type of Dark Energy Model

TL;DR

This paper introduces a flexible dark energy model based on a generalized equation of state that encompasses several existing models and their interactive variants, analyzed through phase-space methods.

Contribution

It proposes a unified framework for various dark energy models and their interactions, with stability analysis indicating potential solutions to the coincidence problem.

Findings

Existence of scaling solutions in both interacting and non-interacting cases.

Identification of attractor solutions that could address the coincidence problem.

Unification of multiple dark energy models within a single generalized form.

Abstract

In this paper, we propose a general form of the equation of state (EoS) which is the function of the fractional dark energy density $\Omega_{d}$. At least, five related models, the cosmological constant model, the holographic dark energy model, the agegraphic dark energy model, the modified holographic dark energy model and the Ricci scalar holographic dark energy model are included in this form. Furthermore, if we consider proper interactions, the interactive variants of those models can be included as well. The phase-space analysis shows that the scaling solutions may exist both in the non-interacting and interacting cases. And the stability analysis of the system could give out the attractor solution which could alleviate the coincidence problem.