Particle Physics Seminar: A highly protected global symmetry from quiver gauge symmetries

Abstract: 

We study an accidental global symmetry obtained from an abelian quiver with scalar bifundamental fields. When spontaneously broken, it is associated to a Goldstone boson whose mass  may receive explicit breaking contributions. However, those are strongly suppressed already for a few quiver sites if the gauge charges of the scalars are appropriately chosen. Such an accidental  global symmetry has then the potential to realize models of QCD axion or cosmological Goldstone bosons, such as ultra-light dark matter or quintessence.

Seminar Organizer: Prof. Nissan Itzhaki