Cosmological Constraints on Neutrinos Cosmology constrains: σ (N eff ) σ ( Σ m ν ) • Sum of the neutrino masses Boss BAO ( 𝚻m 𝝃 ) ; expected to be > 60 meV 2015 Stage 2 prior from oscillation experiments 2016 0.14 150 meV • Relativistic energy density: 2017 Typically re-defined as the 2018 effective number of relativistic Stage 3 species ( N eff ) ; expected to be 2019 Boss BAO ~3, i.e., the number of neutrino 2020 prior species 2021 0.06 60 meV Future (~10 years) experiments 2022 (CMB-S4, DESI, LSST), expect 2023 Stage 4 factor of several improvements 2024 in constraints. DESI+CMB-S4 2025 prior Modified from CMB-S4 Science Book 0.02 15 meV 2026+ (arXiv:1610.02743) Neutrino Cosmology | Brad Benson 04/05/17 1
Cosmic Complementarity with HEP Neutrino Experiments Lower limits for ββ Exp. Synergy with DUNE “In the case of a normal neutrino mass ordering with an example case marked as diamond on the lower curve, CMB-S4 would detect the lowest ︎ 𝚻m 𝝃 at ︎ >3 σ . Also shown is the sensitivity from the long baseline neutrino experiment Dodelson & Lykken (arXiv:1403.5173) (DUNE) as the pink shaded band, which should be sensitive to the neutrino hierarchy. “ CMB-S4 Science Book (arXiv:1610.02743) Dark Energy and CMB | FNAL Cosmic WG All-Scientist Retreat 2017 04/21/17 2
Cosmic Complementarity with HEP Neutrino Experiments ββ β Cosmo CMB-S4 Science Book (arXiv:1610.02743) Neutrino Cosmology | Brad Benson 04/05/17 3
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