Virtual Coulomb branch and vertex functions
Virtual Coulomb branch and vertex functions
We introduce a variant of the K-theoretic quantized Coulomb branch constructed by Braverman, Finkelberg, and Nakajima, by application of a new virtual intersection theory. In the abelian case, we define Verma modules for such virtual Coulomb branches, and relate them to the moduli spaces of quasimaps into the corresponding Higgs …