4 problems

Let $N$ be a positive integer, let $B$ be a 2-form ${\mathbb Z}_N$ background, and let $\mathcal{P}(B)=B\cup B-B\cup_1 dB$ denote its Pontryagin square. The $'t$ Hooft anomaly clas…

Let a quantum system be in an ordered phase in which a microscopic symmetry is spontaneously broken, and let the ordered phase have emergent higher-form or non-invertible symmetrie…

A quantum system may have several global symmetries, whose ’t Hooft anomalies are obstructions to gauging those symmetries. Two quantum systems have the same anomaly for all symmet…

Let ${\cal Q}_d$ and ${\cal Q}'_d$ be quantum field theories in the same spacetime dimension $d$, with the same global symmetries and 't Hooft anomalies. Seiberg's interpolation co…