Towards a cosmological neutrino mass detection

By R. Allison, P. Caucal, E. Calabrese, J. Dunkley, T. Louis. 2015

155 citations recorded by the source corpus.

Future cosmological measurements should enable the sum of neutrino masses to be determined indirectly through their effects on the expansion rate of the Universe and the clustering of matter. We consider prospects for the gravitationally lensed cosmic microwave background (CMB) anisotropies and baryon acoustic oscillations (BAOs) in the galaxy distribution, examining how the projected uncertainty of ≈15 meV on the neutrino mass sum (a 4σ detection of the minimal mass) might be reached over the next decade. The current 1σ uncertainty of ≈103 meV (Planck-2015 þ BAO-15) will be improved by upcoming “Stage-3” (S3) CMB experiments (S3 þ BAO-15∶ 44 meV), then upcoming BAO measurements (S3 þ DESI∶ 22 meV), and planned next-generation “Stage 4” (S4) CMB experiments (S4 þ DESI∶ 15–19 meV, depending on angular range). An improved optical depth measurement is important: the projected neutrino mass uncertainty increases to 26 meV if S4 is limited to l > 20 and combined with current large-scale polarization data. Looking beyond ΛCDM, including curvature uncertainty increases the forecast mass error by ≈50% for S4 þ DESI, and more than doubles the error with a two-parameter dark-energy equation of state. Complementary low-redshift probes including galaxy lensing will play a role in distinguishing between massive neutrinos and a departure from a w ¼ −1, flat geometry.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/272cac96884364c9ed9463abaf04939f0904cd0e

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In Nuclear and High Energy Physics

Citations in the corpus

Hydrogen Epoch of Reionization Array (HERA) (2016, methodology): “This would represent a ∼5σ cosmological detection of the neutrino masses even under the most pessimistic assumptions still allowed by neutrino oscillation experiments (Allison et al. 2015b), making HERA key to understanding neutrino physics.”
The Simons Observatory: science goals and forecasts (2018, methodology): “For our constraints we make use of the publicly avail- able code axionCAMB25, integrated into a modified version of the Fisher forecast code OxFish (Allison et al. 2015).”
Global constraints on absolute neutrino masses and their ordering (2017, background): “Bounds on Σ from recent cosmological data have been presented in several papers (see, for example, [68–73] and references therein) while forecasts for near (and far) future cosmological datasets have been obtained in [74–79].”
CMB-S4 Science Book, First Edition (2016, unknown): “ization data will have happened before CMB-S4 data is taken and forecast results that include TE and EE data and also largescale temperature and polarization from HFI. This follows approaches in e.g. [646]. For the optical depth to reionization, we assume that Planck has reached currently published ”