Event Details

In the context of 2D CFT, decomposition occurs when we construct an orbifold of a theory by gauging a group G that has a trivially-acting subgroup K.  The resulting theory is a disjoint union of orbifolds by subgroups of the effective G/K symmetry.  We'll generalize this old story by first turning on discrete torsion, and then observing that there are even more phases that can be introduced by exploiting the fact that K acts trivially.  These phases sometimes let us gauge G even when it has an anomaly, or let us extend an anomalous group to something we can gauge.