Fermion Mass Hierarchy and a High Quality Axion From Gauged U(1) Flavor Symmetry
The research proposes a unified theory using a gauged U(1) flavor symmetry to explain fermion mass hierarchies and solve the strong CP problem via an axion. It introduces mechanisms like Froggatt-Nielsen for mass structure and demonstrates how the axion's potential is protected from quantum gravity, leading to predictions for high-quality axions.