Reionization histories with higher total optical depth can move the best-fit neutrino mass sum to positive values around 0.06 eV within 95% confidence from CMB and BAO data.
CMB lensing from Planck PR4 maps
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Reionization History and Neutrino Mass
Reionization histories with higher total optical depth can move the best-fit neutrino mass sum to positive values around 0.06 eV within 95% confidence from CMB and BAO data.