Updated Bounds on Sum of Neutrino Masses in Various Cosmological Scenarios

Shouvik Roy Choudhury; Sandhya Choubey

doi:10.1088/1475-7516/2018/09/017

paper

Updated Bounds on Sum of Neutrino Masses in Various Cosmological Scenarios

arXiv:1806.10832 · doi:10.1088/1475-7516/2018/09/017

Abstract

We present strong bounds on the sum of three active neutrino masses ( $\sum m_{ν}$ ) in various cosmological models. We use the following baseline datasets: CMB temperature data from Planck 2015, BAO measurements from SDSS-III BOSS DR12, the newly released SNe Ia dataset from Pantheon Sample, and a prior on the optical depth to reionization from 2016 Planck Intermediate results. We constrain cosmological parameters in $Λ C D M$ model with 3 massive active neutrinos. For this $Λ C D M + \sum m_{ν}$ model we find a upper bound of $\sum m_{ν} <$ 0.152 eV at 95 $%$ C.L. Adding the high- $l$ polarization data from Planck strengthens this bound to $\sum m_{ν} <$ 0.118 eV, which is very close to the minimum required mass of $\sum m_{ν} ≃$ 0.1 eV for inverted hierarchy. This bound is reduced to $\sum m_{ν} <$ 0.110 eV when we also vary r, the tensor to scalar ratio ( $Λ C D M + r + \sum m_{ν}$ model), and add an additional dataset, BK14, the latest data released from the Bicep-Keck collaboration. This bound is further reduced to $\sum m_{ν} <$ 0.101 eV in a cosmology with non-phantom dynamical dark energy ( $w_{0} w_{a} C D M + \sum m_{ν}$ model with $w (z) \geq - 1$ for all $z$ ). Considering the $w_{0} w_{a} C D M + r + \sum m_{ν}$ model and adding the BK14 data again, the bound can be even further reduced to $\sum m_{ν} <$ 0.093 eV. For the $w_{0} w_{a} C D M + \sum m_{ν}$ model without any constraint on $w (z)$ , the bounds however relax to $\sum m_{ν} <$ 0.276 eV. Adding a prior on the Hubble constant ( $H_{0} = 73.24 \pm 1.74$ km/sec/Mpc) from Hubble Space Telescope (HST), the above mentioned bounds further improve to $\sum m_{ν} <$ 0.117 eV, 0.091 eV, 0.085 eV, 0.082 eV, 0.078 eV and 0.247 eV respectively. This substantial improvement is mostly driven by a more than 3 $σ$ tension between Planck 2015 and HST measurements of $H_{0}$ and should be taken cautiously. (abstract abridged)

arXiv comment31 pages, 19 figures, matches published version in JCAP

Updated Bounds on Sum of Neutrino Masses in Various Cosmological Scenarios

Abstract

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