Flavour Violating Axions

Abstract

I review the physics case for flavour violating axions. In particular, I argue that relaxing the assumption of the universality of the Peccei-Quinn current opens up new pathways, including: the relaxation of the Supernova bound on the axion mass, a possible connection with the Standard Model flavour puzzle and the experimental opportunity of discovering the axion via flavoured axion searches.

Comments: 9 pages, 2 figures. Talk given at the Workshop `Flavour changing and conserving processes' 29-31 August 2019 (Capri Island, Italy). v2: references added