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Axion quality problem and nonminimal gravitational coupling in the Palatini formulation
In axion models, the global U(1) Peccei-Quinn (PQ) symmetry is explicitly broken by nonperturbative effects of gravity, such as axionic wormholes. The gravitational violation of the PQ symmetry due to wormholes is large enough to invalidate the PQ mechanism, which is entitled as the axion quality pr...
| Autores principales: | , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2022
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.108.015007 http://cds.cern.ch/record/2838135 |