The Holographic QCD Axion

Ottobre 30, 2019@2:30 pm–3:30 pm
Aula 603

Seminario di Fisica Teorica
Dr. Francesco Bigazzi (INFN Firenze)
A holographic model of QCD axion is presented. It describes a
composite axion in the KSVZ class. Having a gravity dual, based on the
Witten-Sakai-Sugimoto model, it is calculable in the strongly coupled
regime and its UV completion is under control. Its basic properties are
derived, including the low energy Lagrangian, from which the axion
couplings to nucleons can be derived. Basic features in the deconfined
phase are studied as well. In particular, the temperature dependence of
the axion mass is extracted from the topological susceptibility.