Such constructions, at the field theory level, are quite general and can be interpreted as the four-dimensional field theory realization of the Green-Schwarz mechanism of anomaly cancellation of string theory. The extra neutral currents associated to these models have been investigated in the past, in orientifold models with intersecting branes, under the assumption that the Stückelberg scale was in the multi-TeV region. Such axion models represent a significant variant with respect to earlier scenarios, where axion fields were associated with global anomalies, because of the Stückelberg field, which is essential for the cancellation of gauge anomalies in the presence of extra U(1) symmetries. Here, we review a class of models which generalize the traditional Peccei-Quinn (PQ) axion solution by a Stückelberg pseudoscalar.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |