22.03.2022 (Tuesday)

On anomalies and gauging of U(1) non-invertible symmetries in 4d QED

Exceptional Seminar Avner Karasik (Cambridge University)

at:
11:00 QMUL
room GO Jones 610
abstract:

I will present a way to promote the anomalous axial U(1) in 4d QED to an exact symmetry, with the price of losing its invertibility. I will then discuss some applications of this non-invertible U(1) symmetry. In particular, I will show how to couple this non-invertible symmetry to a gauge field. By taking this gauge field to be dynamical, we get a new type of gauge theory with unconventional interactions and constraints. By taking this gauge field to be background, we can study 't-Hooft anomalies of the non-invertible symmetry.