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Vacuum stability of the type II seesaw leptogenesis from inflation
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Recently it has been found that introducing a triplet Higgs to the standard model could provide a feasible leptogenesis to generate the baryon asymmetry of our universe, providing that the inflation is driven by the mixing state of the triplet Higgs and SM Higgs. In this work, we survey the viable parameter space satisfying the vacuum stability and perturbativity in this model. We find that the introduction of the triplet Higgs would also ameliorate the problem of the Higgs vacuum instability. We present two representative parameter regions where the origin of neutrino masses, baryon asymmetry of the universe as well as inflation can be explained while keeping consistent with the condition of vacuum stability and perturbativity.
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Probing Type II Seesaw Leptogenesis Through Lepton Flavor Violation
A scan over 3σ neutrino parameters yields the most conservative lower bounds on the triplet-Higgs cubic coupling from μ→eγ, μ→3e, and μ-e conversion.
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