## 28/05/2012, Monday, 16:30–17:30

The spectrum of BPS states of $$N=2$$ supersymmetric gauge theories has a subtle moduli dependence. The moduli space is divided in chambers and across chambers the spectrum jumps according to a wall-crossing formula. In certain chambers the whole spectrum can be generated via a so-called BPS quiver. We use a simple modification of this quiver to characterize line defects by studying which BPS states can form a bound state with the defect.