I will discuss two methods for diagnosing ’t Hooft anomalies of
internal symmetries in 2+1d lattice systems. Anomalous symmetries
of this kind arise naturally at the boundary of 3+1D
symmetry-protected topological phases, and are known to be...
The Gaiotto-Moore-Witten "Algebra of the Infrared" allows one to
construct the category of supersymmetric boundary conditions for a
wide class of massive N=(2,2) QFTs in two dimensions. In
particular, it applies to N=(2,2) QFTs defined by a Morse...
