A single scalar triplet, together with an axion-like particle, can generate the observed baryon asymmetry via leptogenesis from axion oscillation after inflation, while giving neutrinos their small masses through the type-II seesaw mechanism.
The latter condition can be represented as ΓID(HH←→∆)|T =M∆ <H|T =M∆, (25) where ΓID(HH←→∆)|T =M∆≈ ΓD(∆→HH )≃ µ2 32πM∆
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Triplet Higgs assisted leptogenesis from axion oscillation after inflation
A single scalar triplet, together with an axion-like particle, can generate the observed baryon asymmetry via leptogenesis from axion oscillation after inflation, while giving neutrinos their small masses through the type-II seesaw mechanism.