Frame Anomalies for the Entanglement in Chiral Theories

 In quantum field theory, the entropy of a region is nonzero, even in the vacuum state, due to entanglement between the fields inside and outside the region.  But in field theories with gravitational anomalies, the entropy of a region is no longer invariant under a Lorentz boost near the boundary.  Thus there is an anomaly in the entanglement entropy, even on backgrounds on which the gravitational anomaly vanishes.  I will show how this effect can be derived by physical arguments based on the propagation of chiral modes, and from the path integral, in various dimensions.  Based on arXiv:1509.04325.