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Measuring the Total Neutrino Mass with the 21-cm Forest Power Spectrum

A cosmological forecasting method that uses the one-dimensional power spectrum of the 21-cm forest, redshifted HI absorption lines toward high-redshift radio sources during reionization, to constrain the sum of neutrino masses via the neutrino free-streaming suppression of small-scale matter fluctuations, after accounting for intergalactic-medium heating.