  Five fundamental problems - neutrino oscillations, baryogenesis, dark matter,
inflation, strong CP problem - are solved at one stroke in "SM-A-S-H" (Standard
Model-Axion-Seesaw-Higgs portal inflation) model by Andreas Ringwald et. al.
The Standard Model (SM) particle content was extended by three right-handed
SM-singlet neutrinos $N_i$, a vector-like color triplet quark $Q$, a complex
SM-singlet scalar field $\sigma$ that stabilises the Higgs potential, all of
them being charged under a global lepton number (hyper-charge) and Peccei-Quinn
(PQ) $U(1)$ symmetry. We found numerically that SMASH model not only solves
five fundamental problems but also the sixth problem "Vacuum Metastability"
through the extended scalar sector.
