Cosmological Constraints on Neutrinos Cosmology constrains: (N eff - - PowerPoint PPT Presentation

Neutrino Cosmology | Brad Benson 04/05/17

Cosmological Constraints on Neutrinos

Cosmology constrains:

• Sum of the neutrino masses

(𝚻m𝝃); expected to be > 60 meV from oscillation experiments

• Relativistic energy density:

Typically re-defined as the effective number of relativistic species (Neff); expected to be ~3, i.e., the number of neutrino species

Future (~10 years) experiments (CMB-S4, DESI, LSST), expect factor of several improvements in constraints.

1

Modified from CMB-S4 Science Book (arXiv:1610.02743)

2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026+ Stage 2
 Stage 3
 Stage 4

σ(Neff)

0.14 0.06

0.02

σ(Σmν)

150 meV 60 meV

15 meV

Boss BAO
 prior Boss BAO
 prior DESI+CMB-S4
 prior

Dark Energy and CMB | FNAL Cosmic WG All-Scientist Retreat 2017 04/21/17

Cosmic Complementarity with HEP Neutrino Experiments

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Dodelson & Lykken (arXiv:1403.5173) CMB-S4 Science Book (arXiv:1610.02743)

“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 ︎𝚻m𝝃 at ︎>3σ. Also shown is the sensitivity from the long baseline neutrino experiment (DUNE) as the pink shaded band, which should be sensitive to the neutrino hierarchy. “

Lower limits for ββ Exp. Synergy with DUNE

Neutrino Cosmology | Brad Benson 04/05/17

3

CMB-S4 Science Book (arXiv:1610.02743)

Cosmic Complementarity with HEP Neutrino Experiments

ββ β Cosmo