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Improved constraints on lepton asymmetry from the cosmic microwave background

Schwarz, Dominik J.; Oldengott, Isabel M.

A cosmic lepton asymmetry η_\text{l}=(n_\text{l}-n_\bar{\text{l}})/n_γ affects the primordial helium abundance and the expansion rate of the early Universe. Both of these effects have an impact on the anisotropies of the cosmic microwave background (CMB). We derive constraints on the neutrino chemical potent…