Maths HEP Lunchtime Seminars: Anomalies of the entanglement entropy in chiral theories
5 February 2016 13:00 in CM221
Certain two-dimensional field theories are afflicted by gravitational anomalies, which imply a non-conservation of stress energy under certain situations. I will discuss universal properties of entanglement entropy in such theories and explain from several points of view how the notion of entanglement entropy now becomes frame-dependent. When such theories have a dual gravitational description, I will explain how the effect of the anomaly is to widen the Ryu-Takayanagi minimal worldline into a “ribbon" whose twist carries non-trivial information. Finally, I will briefly discuss the situation in four dimensions, where the mixed gauge-gravitational anomaly can play a similar role.