Description
Scattering processes involving particles and very heavy probes, modeled by defects, have recently been shown to exhibit an unexpected feature: radiation can be emitted into twisted sectors rather than into the ordinary Hilbert space. In this talk, I will explain that the underlying mechanism is rooted in the subtle realization of bulk symmetries in the presence of defects. In particular, certain defect ’t Hooft anomalies allow charge to be trapped on the defect during scattering, thereby opening channels that would otherwise be forbidden by conservation laws. This viewpoint provides a systematic way to predict the phenomenon in new settings, including massive theories. I will present the general mechanism and discuss explicit examples in 1+1 dimensions.