This week's seminars
Centre for Particle Theory Colloquia: New aspects of gauge anomalies in particle physics
12 February 2019 17:00 in OC218
During the last few years there has been a transformation in our understanding of symmetries and anomalies. The fundamental ideas ultimately originate from condensed matter physics, and more specifically from the classification of topological phases of matter. I will review the basics of the modern viewpoint, and explain a number of results that follow from applying this philosophy to particle physics.
Briefly: we will find that the Standard Model is anomaly-free on arbitrary spacetime topologies (oriented and unoriented), a natural Z_4 refinement of (-1)^F (with F the fermion number) is anomaly free only if the number of fermions in the SM is a multiple of 16, and proton triality being anomaly-free implies that the number of generations is a multiple of 3.
Refreshments at 16:30 in CM 211 (Maths Coffee Room).