TL;DR
This paper discusses the potential of flavour violating axions, highlighting how relaxing universality assumptions can lead to new experimental and theoretical opportunities in axion physics.
Contribution
It introduces the idea that non-universal Peccei-Quinn currents can relax existing bounds and connect axion physics with the Standard Model flavour puzzle.
Findings
Relaxation of Supernova bounds on axion mass.
Potential link between axions and the Standard Model flavour puzzle.
Opportunity for flavoured axion searches in experiments.
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.
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