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Showing 1 to 3 of 3 for “"'t Hooft anomalies"”.
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Dynamics of Chiral Fermions
… of Bars and Yankielowicz who match the ‘t Hooft anomalies of this theory to free fermions. We show that there are novel and, in some cases, quite powerful constraints on the dynamics in the large $N$ limit. In addition, we study these $SU(N)$ theories with an extra Weyl fermion transforming …
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Boundaries, States and Cohomology in Three-Dimensional N = 4 Theories
… in this set-up. From an analysis of boundary 't Hooft anomalies, their boundary amplitudes are demonstrated to represent equivariant elliptic cohomology classes. We then investigate two distinguished classes of N = (2,2) boundary conditions, each in 1-1 correspondence with the set of isolated …
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Symmetry-protected topological phases and quantum anomalies
… phases, we discovered a new formalism of quantum anomalies, associated with discrete spacetime (such as time-reversal and spatial reflection) symmetries in particular, to classify distinct interacting topological phases. An example is the Z2 classification of the (2+1)d topological insulator …