A Simple Motivated Completion of the Standard Model below the Planck Scale: Axions and Right-Handed Neutrinos

Understand

We study a simple Standard Model (SM) extension, which includes three families of right-handed neutrinos with generic non-trivial flavor structure and an economic implementation of the invisible axion idea.

• We find that in some regions of the parameter space this model accounts for all experimentally confirmed pieces of evidence for physics beyond the SM: it explains neutrino masses (via the type-I see-saw mechanism), dark matter, baryon asymmetry (through leptogenesis), solve the strong CP problem and has a stable electroweak vacuum.
• The last property may allow us to identify the Higgs field with the inflaton.