Dynamical Role of Light Neutral Leptons in Cosmology
- 5 February 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 42 (6) , 407-410
- https://doi.org/10.1103/physrevlett.42.407
Abstract
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.Keywords
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