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Using the Vlasov equation, we show that massive galactic halos cannot be composed of stable neutral leptons of mass ≲ 1 MeV. Since most of the mass in clusters of galaxies probably consists of stripped halos, we conclude that the "missing mass" in clusters does not consist of leptons of mass ≲ 1 MeV (e.g., muon or electron neutrinos). Lee and Weinberg's hypothetical heavy leptons (mass ≲ 1 GeV) are not ruled out by this argument.
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