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Published in last 50 years
An automatic E 6 × U(1) axion model is constructed which is cosmologically consistent, predicts three families of fermions at low energies, and admits cosmic strings capable of seeding galaxy formation.
Conditions under which an R symmetry is a cosmologically acceptable Peccei-Quinn symmetry are found. These conditions are then imposed on specific models and severe constraints on the number of generations in these models are found.