Abstract
A pseudo-Dirac neutrino of mass 50–100 GeV and mass splitting of 5 GeV can be a good candidate for dark matter. The number density of such dark matter should be close the the baryon density in order to get a dark matter density Ω m ~ 0.25. Production of heavy neutrinos by electro-weak sphaleron processes can ensure that the heavy neutrino asymmetry be of the same order as the baryon asymmetry. A mass splitting of the order.
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