String Theory Journal Club

Line defects and emitted radiation

by Dr Lorenzo Bianchi

Europe/Berlin
SR3 (DESY)

SR3

DESY

Description
In the context of (super)conformal field theories extended probes may preserve enough symmetry to put strong constraints on physical observables. We discuss such constraints for a BPS line defect in four-dimensional N=2 superconformal field theories, with a particular focus on supersymmetric Wilson lines. For the latter case our techniques allow to prove a simple non-trivial relation between the energy emitted by a moving particle and the insertion of a stress tensor operator in the defect background. We discuss the existence of such a relation for other defects and we outline its powerful role for exact computations via localization.