The Result of the Neutrino-4 Experiment and the Cosmological Constraints on the Sterile Neutrino

TL;DR

This paper discusses the Neutrino-4 experiment's findings on sterile neutrinos, compares them with cosmological constraints, and highlights the tension between experimental results and cosmological models, urging further research.

Contribution

It provides an analysis of the Neutrino-4 results and their implications for cosmological constraints on sterile neutrinos, emphasizing the need for improved experimental precision.

Findings

Estimated sterile neutrino contribution to the Universe's energy density.

Identified contradiction between experimental parameters and cosmological constraints.

Highlighted the necessity for more precise experiments and theoretical models.

Abstract

We present a short discussion of the Neutrino-4 experimental results and the results of other experiments searching for the sterile neutrino. We estimated the contribution of the sterile neutrino with parameters $\Delta m^2_{14} = 7.3\text{eV}^2$ and $\sin^2 2\theta_{14} = 0.36$ obtained in the Neutrino-4 experiment to the energy density of the Universe. We address the contradiction between the measured sterile neutrino parameters and the constraints on the sterile neutrino from cosmology. With this article, we want to draw attention to the problem of the contradiction between experiment and theory, in order to inspire the search for theoretical models that include a sterile neutrino with mass in the region of several eV, and to the necessity to sufficiently increase the precision of the experiment.