Neutrino mass constraint from CMB and its degeneracy with other cosmological parameters

TL;DR

This paper demonstrates that WMAP CMB data can constrain neutrino mass to below 0.63 eV and explores how neutrino mass degenerates with parameters like the Hubble constant.

Contribution

It provides the first subelectronvolt limit on neutrino mass from CMB data and analyzes its degeneracy with other cosmological parameters.

Findings

WMAP data constrains neutrino mass to < 0.63 eV at 95% CL

Neutrino mass affects the derived Hubble constant from CMB data

Degeneracy between neutrino mass and other cosmological parameters is significant

Abstract

We show that the cosmic microwave background (CMB) data of WMAP can give subelectronvolt limit on the neutrino mass: m_nu < 0.63 eV (95% CL). We also investigate its degeneracy with other cosmological parameters. In particular, we show the Hubble constant derived from the WMAP data decreases considerably when the neutrino mass is a few times 0.1 eV.