Constant-roll, cosmic acceleration, and massive neutrinos

TL;DR

This paper introduces a cosmological model linking massive neutrinos and quintessence under constant-roll conditions to explain late-time cosmic acceleration and address the coincidence problem.

Contribution

It presents a novel coupling mechanism between massive neutrinos and quintessence within a constant-roll framework to model cosmic acceleration.

Findings

Neutrinos becoming non-relativistic trigger dark energy increase.

Model achieves late-time acceleration consistent with observations.

Alleviates the coincidence problem through neutrino-quintessence interaction.

Abstract

We propose a model to describe the late-time cosmic acceleration in the context of the constant-roll model. By considering a coupling between massive neutrinos and the quintessence, the onset of evolution of the quintessence is related to the neutrinos' behavior. When the neutrinos become non-relativistic, the dark energy density increases from zero and results in late-time cosmic acceleration alleviating the coincidence problem. The quintessence potential is such that it evolves under the constant-roll condition giving rise to persistent late-time acceleration.