Speaker:  Francesco Sala (University of Pisa)

Title: Cohomological Hall algebras and their representations versus Nakajima operators

Abstract:  In the first part of the talk, I will give a brief introduction to the theory of 2d cohomological Hall algebras (COHAs), focusing on the example of COHAs of zero-dimensional sheaves on smooth surfaces. Additionally, I will describe certain geometric representations of these COHAs and introduce Nakajima type operators. In the second part of the talk, I will discuss a generalization and categorification of this framework.