Key points are not available for this paper at this time.
A simple and natural extension of the standard CDM model is to allow relic neutrinos to have non-zero degeneracy. We confront this CDM model, CDM with neutrino mass M_ and degeneracy ₃ as additional parameters, with the Planck TT, lowT, plik--lensing, BAO, and DES datasets, and we observe a strong preference (Bayes factor ₁₀B=1. 9) for it over the standard CDM model. Both the H₀ and S₈ tensions are resolved to within 1 with the same set of neutrino parameters, along with 3 evidence for nonzero neutrino mass (M_=0. 58^+0. 17-₀. ₁₃\ eV) and degeneracy (₃=1. 27^+0. 42-₀. ₂₂). Furthermore, our analysis favors the scalar index nₛ to be slightly larger than 1, compatible with some hybrid inflation models, as well as a significantly larger optical depth than the standard Planck value, indicating an earlier onset of reionization.
Yeung et al. (Mon,) studied this question.