Updating non-standard neutrinos properties with Planck-CMB data and full-shape analysis of BOSS and eBOSS galaxies

Using the latest observational data from Planck-CMB and its combination with the pre-reconstructed full-shape (FS) galaxy power spectrum measurements from the BOSS DR12 sample and eBOSS LRG DR16 sample, we report the observational constraints on the cosmic neutrino properties given by the extended Lambda CDM scenario: Lambda CDM + N-eff + Sigma m(nu) + c(eff)(2) + c(vis)(2) + xi(nu), and its particular case Lambda CDM + c(eff)(2) + c(vis)(2) + xi(nu), where N-eff, Sigma m(nu), c(eff)(2), c(vis)(2), xi(nu) are the effective number of species, the total neutrino mass, the sound speed in the neutrinos rest frame, the viscosity parameter and the degeneracy parameter quantifying a cosmological leptonic asymmetry, respectively. We observe that the combination of FS power spectrum measurements with the CMB data significantly improves the parametric space of the models compared to the CMB data alone case. We find no evidence for neutrinos properties other than the ones predicted by the standard cosmological theory. Our most robust observational constraints are given by CMB + BOSS analysis. For the generalized extended Lambda CDM scenario, we find c(eff)(2) = 0.3304(-0.0075)(+0.0064), c(vis)(2) = 0.301(-0.033)(+0.037), xi(nu) < 0.05, N-eff = 2.90 +/- 0.15 at 68% CL, with Sigma m(nu) < 0.116 eV at 95% CL. These are the strongest limits ever reported for these extended Lambda CDM scenarios.

Automated summary

The study reports observational constraints on the cosmic neutrino properties using the latest observational data and finds that combining FS power spectrum measurements with CMB data significantly improves the models' parametric space. The results confirm the predictions of standard cosmological theory regarding neutrino properties.