Updated results on neutrino mass and mass hierarchy from cosmology with Planck 2018 likelihoods

By Shouvik Roy Choudhury, S. Hannestad. Journal of Cosmology and Astroparticle Physics, 2019

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In this work we update the bounds on ∑ mν from latest publicly available cosmological data and likelihoods using Bayesian analysis, while explicitly considering particular neutrino mass hierarchies. In the minimal ΛCDM + ∑ mν model with most recent CMB data from Planck 2018 TT,TE,EE, lowE, and lensing; and BAO data from BOSS DR12, MGS, and 6dFGS, we find that at 95% C.L. the bounds are: ∑ mν<0.12 eV (degenerate), ∑ mν<0.15 eV (normal), ∑ mν<0.17 eV (inverted). The bounds vary across the different mass orderings due to different priors on ∑ mν. Also, we find that the normal hierarchy is very mildly preferred relative to the inverted, using both minimum χ2 values and Bayesian Evidence ratios. In this paper we also provide bounds on ∑ mν considering different hierarchies in various extended cosmological models: ΛCDM + ∑ mν+r, wCDM+∑ mν, w0 wa CDM+∑ mν, w0 wa CDM+∑ mν with w(z)⩾ −1, Λ CDM + ∑ mν + Ωk, and Λ CDM + ∑ mν + ALens. We do not find any strong evidence of normal hierarchy over inverted hierarchy in the extended models either.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4d2e6dc531e59dbaaeab775c838b54b45fef13cf