The Sterile Neutrino Field and Late Time Acceleration

TL;DR

This paper proposes a model where interactions involving sterile neutrinos and a dark U(1) gauge field naturally lead to late-time cosmic acceleration, linking dark energy scale to fundamental masses without instabilities.

Contribution

It introduces a novel mechanism connecting sterile neutrino interactions with dark energy and addresses the coincidence problem within the $ u MSM$ framework.

Findings

Late-time acceleration is achieved dynamically in the model.

The model naturally reproduces the relation between dark energy, weak, and Planck scales.

Perturbations of the vector fields are oscillatory, indicating stability.

Abstract

We show that when the neutrino minimal standard model ($\nu MSM$) with a light sterile neutrino has a long range interaction between the neutrino vacuum charge density and a dark U(1) gauge potential, late time acceleration is dynamically realized. Moreover, the relation between the scale of dark energy, the weak and Planck masses derived by Arkani-Hamed et. al \cite{ArkaniHamed:2000tc} that addresses the coincidence problem arises naturally in this model. Assuming that the cosmological constant is zero by some as yet known mechanism, the only fine tuning in our model is the mass of the sterile neutrino. We show that perturbations of the vector fields are oscillatory and hence, there are no instabilities.