The geometric construction of DAHA by the equivariant K-theory of the Steinberg-type variety for an affine flag variety by Vasserot, Varagnolo-Vasserot is a precursor of the Coulomb branch construction. It has been generalized to versions of DAHA, such as cyclotomic DAHA naturally in view of Coulomb branches. I would like to recall these results, and then add one new example which seems not be known before.
This video was produced by the International Centre for Mathematical Sciences, as part of the workshop The Geometry of Double Affine Hecke Algebras and Coulomb Branches.
