5. Theoretical Physics (CSN4)

Composite Accidental Axions

by Michele Redi (CERN/INFN)

Europe/Rome
Aula A1 (LNF)

Aula A1

LNF

Via Enrico Fermi, 40 00044 Frascati (Roma)
Description
One of the main problems of axion scenarios is to explain the origin of an almost exact Peccei-Quinn symmetry only broken by the QCD anomaly. In this talk I will present several models where the QCD axion arises accidentally. This can be realised in confining gauge theories where the Peccei-Quinn symmetry can emerge accidentally if the representations are chiral. In some cases these models can be understood as the deconstruction of 5-dimensional gauge theories but more general constructions are possible. Phenomenological features will be discussed.