Speaker: Kantaro Ohmori (UTokyo)
Title: Symmetry Spans and Enforced Gaplessness
Abstract: Anomaly matching for continuous symmetries has been the primary tool for establishing symmetry enforced gaplessness—the phenomenon where global symmetry alone forces a quantum system to be gapless in the infrared. In this talk I will instroduce the notion of “symmetry span”, which is a pair of symmetries sharing a nontrivial subsymmetry. We show, with particular examples of symmetry spans, that there is no relativistic gapped phase compatible, even though both of the pair of the symmetries in the span are non-anomalous. Examples include continuous CFTs and lattice models in 1+1-dimensions.
Note unusual time: 2 pm GMT