Avoiding parameter fine-tuning in mass varying neutrino models of DE?

TL;DR

This paper investigates mass-varying neutrino models of dark energy with inverse power-law potentials, aiming to address fine-tuning issues and explain the coincidence problem without being affected by quantum corrections.

Contribution

It analyzes the naturalness and robustness of mass-varying neutrino models of dark energy, focusing on inverse power-law potentials and their ability to avoid fine-tuning and initial condition problems.

Findings

Mass-varying neutrino models can naturally address the coincidence problem.

Inverse power-law potentials in these models are resilient to quantum corrections.

The models potentially avoid fine-tuning of parameters and initial conditions.

Abstract

Coupled models of quintessence are usually introduced for avoiding or mitigating the parameter fine-tuning problem. At the same time, the coupled models should avoid the fine-tuning problem related to the initial conditions as quintessence models do. One more attractive feature of coupled models might be the explanation of the timescale at which the coincidence of DE and matter energy densities occur and the understanding of reason why after this the DE takes over. And finally, all these nice features should be unaffected by the quantum corrections of the potential. Having in mind these remarks, we shall focus our discussion on mass varying neutrino model of DE with inverse power-law potential to see how naturally does it work.