Constraining the neutrino mass using a multitracer combination of two galaxy surveys and cosmic microwave background lensing
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Date
2022
Authors
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Journal ISSN
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Publisher
Oxford University Press
Abstract
Measuring the total neutrino mass is one of the most exciting opportunities available with next-generation cosmological data
sets. We study the possibility of detecting the total neutrino mass using large-scale clustering in 21 cm intensity mapping and
photometric galaxy surveys, together with cosmic microwave background (CMB) information. We include the scale-dependent
halo bias contribution due to the presence of massive neutrinos, and use a multitracer analysis in order to reduce cosmic variance.
The multitracer combination of an SKAO-MID 21 cm intensity map with stage 4 CMB dramatically shrinks the uncertainty on
total neutrino mass to σ(Mν ) 45 meV, using only linear clustering information (kmax = 0.1 h Mpc−1
) and without a prior on
optical depth. When we add to the multitracer the clustering information expected from Legacy Survey of Space and Time, the
forecast is σ(Mν ) 12 meV.
Description
Keywords
Neutrinos, Cosmology, Astronomy, Astrophysics, Radiation
Citation
Ballardini, M., & Maartens, R. (2022). Constraining the neutrino mass using a multitracer combination of two galaxy surveys and cosmic microwave background lensing. Monthly Notices of the Royal Astronomical Society, 510(3), 4295-4301. 10.1093/mnras/stab3480