Speaker
Alejandro Celis
(IFIC CSIC-Universitat de Valencia)
Description
The Peccei-Quinn mechanism is perhaps the most compelling solution we have for the strong-CP problem. The mechanism predicts the existence of a pseudo-Goldstone boson, the axion, which could account for the dark matter content of the Universe. The smallness of active neutrino masses can also be explained in axion models via a type-I see-saw mechanism, providing a dynamical origin for the heavy see-saw scale.
I will present a class of invisible axion models with tree-level FCNCs controlled by the fermion mixing matrices. I will discuss the axion phenomenology in these models taking into account: rare kaon and muon decays, astrophysical considerations and axion searches relying on the axion coupling to photons. Some of the models considered have a domain-wall number equal to one and avoid the domain-wall problem, unlike the DFSZ invisible axion model. I will also discuss possible solutions to the hierarchy problem in these models which do not invoke supersymmetry.
Authors
Alejandro Celis
(IFIC CSIC-Universitat de Valencia)
Hugo Serodio
(IFIC)
Javier Fuentes
(Instituto de Fisica Corpuscular)
