Phantom dark energy with varying-mass dark matter particles: acceleration and cosmic coincidence problem

TL;DR

This paper examines varying-mass dark matter models within phantom cosmology to determine if they can resolve the cosmic coincidence problem, concluding they cannot.

Contribution

It provides a systematic analysis showing that varying-mass dark matter models do not solve or alleviate the coincidence problem in phantom cosmology.

Findings

Varying-mass dark matter models do not resolve the coincidence problem.

Exponential or power-law potentials and mass dependences are insufficient.

Phantom dark energy models cannot be reconciled with varying-mass dark matter for solving the coincidence problem.

Abstract

We investigate several varying-mass dark-matter particle models in the framework of phantom cosmology. We examine whether there exist late-time cosmological solutions, corresponding to an accelerating universe and possessing dark energy and dark matter densities of the same order. Imposing exponential or power-law potentials and exponential or power-law mass dependence, we conclude that the coincidence problem cannot be solved or even alleviated. Thus, if dark energy is attributed to the phantom paradigm, varying-mass dark matter models cannot fulfill the basic requirement that led to their construction.