(Université de Lisbonne & IHÉS)
Amhithéâtre Léon Motchane (IHES)
Amhithéâtre Léon Motchane
Le Bois Marie
35, route de Chartres
The goal of this talk is to discuss some properties of line defects in certain supersymmetric QFTs, the so-called theories of class S. I will spend some time reviewing some old work of Gaiotto Moore and Neitzke on the emergence of Hitchin systems in these theories, and on certain coordinates on the associated moduli spaces. Line defects can then be understood as certain functions on these moduli spaces. If there is time I will present new results. The tone of the discussion will be informal.