paper

Naturally light invisible axion and local Z_{13} times Z_3 symmetries

arXiv:hep-ph/0210172 · doi:10.1103/PhysRevD.69.015007

Abstract

We show that by imposing local symmetries in an electroweak model we can implement an invisible axion in such a way that (i) the Peccei-Quinn symmetry is an automatic symmetry of the classical Lagrangian; and (ii) the axion is protected from semi classical gravitational effects. In order to be able to implement such a large discrete symmetry, and at the same time allow a general mixing in each charge sector, we introduce right-handed neutrinos and enlarge the scalar sector of the model. The domain wall problem is briefly considered.

arXiv commentPQ charges and typos corrected

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