On affine Lusztig varieties

Abstract

Affine Lusztig varieties encode the orbital integrals of Iwahori-Hecke functions and serve as building blocks for the (conjectural) theory of affine character sheaves. In this paper, we establish a close relationship between affine Lusztig varieties and affine Deligne-Lusztig varieties. Consequently, we give an explicit nonemptiness pattern and dimension formula for affine Lusztig varieties in most cases.