Speaker
Li Wei
(Institute of Theoretical Physics, Chinese Academy of Sciences)
Description
I will first explain the BPS algebras for 4D N=2 theories in terms of cohomological Hall algebras. We conjecture that for a theory whose BPS spectrum admits a quiver description that is 2-acyclic with infinitely-mutable potential, the BPS algebra reduces to spherical shuffle algebra. I will then explain how to study the 1/2-BPS line defects in the theory as the bimodules of its BPS algebra.
