Predictive Leptogenesis from Minimal Lepton Flavour Violation

Understand

A predictive Leptogenesis scenario is presented based on the Minimal Lepton Flavour Violation symmetry.

• In the realisation with three right-handed neutrinos transforming under the same flavour symmetry of the lepton electroweak doublets, lepton masses and PMNS mixing parameters can be described according to the current data, including a large Dirac CP phase.
• The observed matter-antimatter asymmetry of the Universe can be achieved through Leptogenesis, with the CP asymmetry parameter $\varepsilon$ described in terms of only lepton masses, mixings and phases, plus two real parameters of the low-energy effective description.
• This is in contrast with the large majority of models present in the literature, where $\varepsilon$ depends on several high-energy parameters, preventing a direct connection between low-energy observables and the baryon to photon ratio today.