2019/04/22 by Wenxue Zhang, Zhang, Wenxue, En-Kun Li +11 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.1904.09698
openalex publication_date 2019/04/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we have constrained the neutrino mass and mass hierarchy in the ΛCDM cosmology with the neutrino mass hierarchy parameter Δ, which represents different mass orderings, by using the \it Planck 2015 + BAO + SN + H0 data set, together with the neutrino oscillation and neutrinoless double beta decay data. We find that the mass of the lightest neutrinos and the total neutrino mass are no more than 0.035eV and 0.133 eV at 95% confidence level, respectively. Comparing the result of our joint analysis with that obtained using cosmological data alone, we find that, by adding the neutrino oscillation and neutrinoless double beta decay data, the tendency for normal hierarchy has increased a lot. By means of importance sampling, three other priors are taken into account, i.e., the flat logarithmic prior on the absolute value of the neutrino hierarchy parameter Δ, the flat linear prior on the total neutrino mass Σmν, and the flat logarithmic prior on Σmν. We find that the preference for the normal hierarchy is in agreement whatever what kinds of priors we choose. Finally, we make a Bayesian model analysis about four priors and we find that flat-linear and the flat logarithmic priors on Σmν are the most favored priors.