The grand unified axion not observable?

It is a characteristic of grand unified theories with an axion of the type suggested by Dine, Fischler and Srednicki (1981) that they predict a very small neutron electric dipole moment because the QCD theta vacuum parameter is suppressed. The minimal SU(5) axion model of Wise, Georgi and Glashow (1...

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Detalles Bibliográficos
Autores principales: Ellis, Jonathan Richard, Gaillard, Mary Katherin, Nanopoulos, Dimitri V, Rudaz, S
Lenguaje:eng
Publicado: 1981
Materias:
General Theoretical Physics
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(81)90540-2
http://cds.cern.ch/record/134426
Descripción
Sumario:It is a characteristic of grand unified theories with an axion of the type suggested by Dine, Fischler and Srednicki (1981) that they predict a very small neutron electric dipole moment because the QCD theta vacuum parameter is suppressed. The minimal SU(5) axion model of Wise, Georgi and Glashow (1981) yields a cosmological baryon-to-proton ratio in the same order as that in the minimal SU(5) model with one 5 of Higgs, which is much smaller than required by astrophysics. More complicated grand unified axion models can avoid this problem. (24 refs).

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