Naturally light invisible axion and local Z13⊗Z 3 symmetries
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2004-01-01
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Dias, Alex G.
Pleitez, V. [UNESP]
Tonasse, M. D.
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We show that by imposing local Z13⊗Z3 symmetries in an SU(2)⊗U(1) 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 semiclassical 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. © 2004 The American Physical Society.
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Physical Review D, v. 69, n. 1, 2004.