Constraining the neutrino mass using a multitracer combination of two galaxy surveys and cosmic microwave background lensing
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2022)
摘要
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 SICAO-MID 21 cm intensity map with stage 4 CMB dramatically shrinks the uncertainty on total neutrino mass to sigma(M-nu) similar or equal to 45 meV, using only linear clustering information (k(max) = 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 sigma(M-nu) similar or equal to 12 meV.
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关键词
neutrinos, cosmic background radiation, cosmological parameters, large-scale structure of Universe
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