Phys. Rev. Lett. 42, 407 - 410 (1979)Dynamical Role of Light Neutral Leptons in Cosmology |
Scott Tremaine
W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, and Institute of Astronomy, Cambridge, England
James E. Gunn
W. K. Kellogg Radiation Laboratory, Hale Observatories, California Institute of Technology, Pasadena, California 91125, and Carnegie Institution of Washington, Washington, D. C. 20005
Received 31 May 1978
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.
©1979 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v42/p407
DOI: 10.1103/PhysRevLett.42.407
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