CMSA Quantum Matter in Mathematics and Physics: Discrete Theta Angles, Symmetries and Anomalies


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August 27, 2020 9:30 am - 11:00 am
via Zoom Video Conferencing

Ho Tat Lam - Princeton University

Gauge theories often admit discrete theta angles. Theories with different discrete theta angles can be constructed by gauging a global symmetry in a parent theory with different additional symmetry protected topological (SPT) phases. I will discuss how the global symmetries of these theories and their 't Hooft anomalies are controlled by the SPT phases. I will then present examples in various dimensions that exhibit two-group symmetries and non-invertible symmetries. The talk is based on in collaboration with Po-Shen Hsin.