Solving the density matrix equation shows the Landau-Zener approximation overestimates the Higgs-induced right-handed neutrino dark matter abundance by many orders of magnitude, changing the predicted dark matter mass range.
Entropy production in the Early Universe. A new mechanism
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We expose briefly the role of entropy in the early universe and in particular the importance of searching for new mechanisms of entropy production. We describe a mechanism that shows how entropy is produced during early annihilations and under which conditions the production is not negligible. A MeV tau neutrino provides an interesting application.
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Density matrix calculation of the dark matter abundance in the Higgs induced right-handed neutrino mixing model
Solving the density matrix equation shows the Landau-Zener approximation overestimates the Higgs-induced right-handed neutrino dark matter abundance by many orders of magnitude, changing the predicted dark matter mass range.