A simple model is constructed which satisfies all the laboratory, astrophysical, and cosmological constraints discussed recently by Caldwell and Langacker for the possible existence of a 17-keV neutrino. It is mainly ν_τ, with {ν}_μ as its pseudo-Dirac partner, whereas νₑ is mainly a light pseudo-Dirac neutrino with an inert partner. The decay lifetime of the 17-keV neutrino is estimated to be 10 s or longer.
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Ernest Ma (1992) studied this question.
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