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Speaker:

Michele Cirafici
Affiliation:

IST Lisboa
Date:

Tue, 28/11/2017 - 17:30 - 18:30
Location:

MPIM Lecture Hall 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.

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