Naturally light invisible axion and local Z(13)circle times Z(3) symmetries
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Amer Physical Soc
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Abstract
We show that by imposing local Z(13)circle timesZ(3) symmetries in an SU(2)circle timesU(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.
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English
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Physical Review D. College Pk: Amer Physical Soc, v. 69, n. 1, 4 p., 2004.
