Geometric construction of Schur algebras

Abstract

We provide the geometric construction of a series of generalized Schur algebras of any type via Borel-Moore homologies and equivariant K-groups of generalized Steinberg varieties. As applications, we obtain a Schur algebra analogue of the local geometric Langlands correspondence of any type, provide an equivariant K-theoretic realization of quasi-split $ı$quantum groups of affine type AIII, and establish a geometric Howe duality for affine ($ı$-)quantum groups.

arXiv comment54 pages; Add more details in v2