SM*A*S*H

A minimal extension of the Standard Model (SM) is presented that provides aconsistent picture of particle physics and cosmology below the Planck scaleaccounting for inflation, baryogenesis, dark matter, neutrino masses andsolving the strong CP problem. We add to the SM three right-handed SMsinglet neutrinos, a new vector-like color triplet fermion and a complexhidden scalar whose vacuum expectation value at ∼ 10^11 GeV breaks leptonnumber and the Peccei-Quinn symmetry simultaneously. At low energies, themodel reduces to the SM, augmented by see-saw-generated neutrino masses andmixing, plus the axion, which accounts for the dark matter. Fivefundamental problems of particle physics and cosmology are solved at onestroke in this unified Standard Model Axion See-saw Hidden scalar inflation(SM*A*S*H) model