Geometria Complessa e Geometria Differenziale
Geometria Complessa e Geometria Differenziale
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Categorification and cohomological Hall algebras

Francesco Sala

created by daniele on 04 Sep 2019

20 sep 2019 -- 11:30

Aula Tricerri, DiMaI, Firenze


Let M denote the moduli stack of either coherent sheaves on a smooth projective surface or Higgs sheaves on a smooth projective curve X. The convolution algebra structure on the Borel-Moore homology of M is an instance of two-dimensional cohomological Hall algebras. These examples were defined by Kapranov-Vasserot and by Schiffmann and me, respectively. During the first part of the talk, I will give a gentle introduction to cohomological Hall algebras and their relevance in algebraic geometry and representation theory. The second part of the talk is devoted to the description of the full categorification of the cohomological Hall algebra of M. I will explain the construction and some applications in the theory of moduli spaces of sheaves. This is based on a joint work with Mauro Porta.

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