Probing the neutrino chemical potential with cosmological observations

Pietro Ghedini, Riccardo Impavido, Stefano Gariazzo +2

The electron neutrino degeneracy parameter, ${\xi }_{{\nu }_{\mathrm{e}}}={\mu }_{{\nu }_{\mathrm{e}}}/T$, is tightly constrained by Big Bang Nucleosynthesis (BBN), while the degeneracy parameters of…