Interacting phantom dark energy: new accelerating scaling attractors

TL;DR

This paper explores new accelerating scaling attractors in interacting phantom dark energy models using dynamical system analysis, revealing novel stable solutions that could address the cosmic coincidence problem.

Contribution

It introduces new potentials for the phantom field and identifies previously unknown stable scaling attractors in interacting dark energy models.

Findings

Existence of saddle matter-dominated points

Stable dark-energy dominated points

New stable accelerating scaling attractors

Abstract

We perform a detailed investigation of interacting phantom cosmology, by applying the powerful method of dynamical system analysis. We consider two well-studied interaction forms, namely one global and one local one, while the novel ingredient of our work is the examination of new potentials for the phantom field. Our analysis shows the existence of saddle matter-dominated points, stable dark-energy dominated points, and scaling accelerating solutions, that can attract the Universe at late times. As we show, some of the stable accelerating scaling attractors, in which dark matter and dark energy can co-exist, alleviating the cosmic coincidence problem, are totally new, even for the previously studied interaction rates, and arise purely from the novel potential forms.