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On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos
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We compare two approaches for determining the generation of lepton asymmetry during production and decay of quasi-degenerate neutrinos, namely the density matrix formalism and a recent proposal which does not involve any counting of neutrino number densities and is based on plugging the resummed propagator in a quantum field theory model for neutrino oscillations. We show numerically and analytically that they are almost equivalent except in the limit of very large mass splittings. The comparison, performed in a simple scalar toy model, helps to understand several issues that have been discussed in the literature.
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Low-scale leptogenesis in the scotogenic model: spectator processes and benchmark points
TeV-scale leptogenesis in the scotogenic model is viable with proper treatment of spectator processes, yielding benchmark points that reproduce the baryon asymmetry and predict observable CLFV rates.
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