Constraint on Neutrino Statistics from Cosmological Data

TL;DR

This study uses cosmological data to constrain neutrino statistics, finding that purely bosonic neutrinos are unlikely and fermionic neutrinos are favored, impacting our understanding of neutrino properties.

Contribution

It provides the first cosmological constraints on neutrino statistical nature, linking neutrino statistics with cosmological parameters.

Findings

Purely bosonic neutrinos are ruled out at 95% confidence.

Fermionic neutrinos are preferred by the data.

Constraints relate neutrino statistics to neutrino mass and Hubble constant.

Abstract

We investigate the impact of neutrino statistical property on cosmology and the constraints imposed by cosmological data on neutrino statistics. Cosmological data from probes such as Cosmic Microwave Background(CMB) radiation and Baryon Acoustic Oscillation(BAO) are used to constrain the statistical parameter of neutrino. This constraint is closely related to the degeneracy effects among neutrino statistical property, the sum of neutrino masses, and the Hubble constant. Our results show that purely bosonic neutrinos can be ruled out at 95\% confidence level and purely fermionic neutrinos are preferred.