Published on *Max Planck Institute for Mathematics* (http://www.mpim-bonn.mpg.de)

Posted in

- Talk [1]

Speaker:

Michele Cirafici
Affiliation:

IST Lisboa
Date:

Tue, 2017-11-28 17:30 - 18:30 I will discuss a certain class of line defects in four dimensional supersymmetric theories

with $\mathcal{N}=2$. Many properties of these operators can be rephrased in terms of

quiver representation theory. In particular one can study BPS invariants of a new kind, the

so-called framed BPS states, which correspond to bound states of ordinary BPS states with

the defect. Such invariants determine the IR vev of line operators. I will discuss how these

invariants arise from framed quivers. Time permitting I will also discuss a formalism to study

these quantities based on cluster algebras.

**Links:**

[1] http://www.mpim-bonn.mpg.de/taxonomy/term/39

[2] http://www.mpim-bonn.mpg.de/node/3444

[3] http://www.mpim-bonn.mpg.de/YRSM2017