http://arxiv.org/abs/2205.04292
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 + $N_{\rm eff}$ + $\sum m_{\nu}$ + $c^2_{\rm eff}$ + $c^2_{\rm vis}$ + $\xi_{\nu}$, and its particular case $\Lambda$CDM + $c^2_{\rm eff}$ + $c^2_{\rm vis}$ + $\xi_{\nu}$, where $N_{\rm eff}$, $\sum m_{\nu}$, $c^2_{\rm eff}$, $c^2_{\rm vis}$, $\xi_{\nu}$ 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 full 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 $c^2_{\rm eff}=0.3300\pm 0.0083$, $c^2_{\rm vis}=0.283\pm 0.047$, $\xi_{\nu} < 0.26$, $N_{\rm eff}=2.98^{+0.20}{-0.27}$ at 68\% CL, with $\sum m{\nu} < 0.117$ eV at 95\% CL while for the aforementioned particular case, $\xi_{\nu} < 0.06$ at 68\% CL. These are the strongest limits ever reported for these extended $\Lambda$CDM scenarios.
S. Kumar, R. Nunes and P. Yadav
Tue, 10 May 22
66/70
Comments: 20 pages, 4 figures, 4 tables
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