Poles of intertwining operators in terms of irreducible components of Lusztig's characteristic variety in type A

Abstract

In this paper, we propose a conjectural formula for the order of the poles of intertwining operators in the context of the representation theory of general linear groups over $p$-adic fields. More specifically, we conjecturally relate the order of the pole to the dimension of a Hom-space associated with irreducible components of Lusztig's characteristic variety in type $A$. We verify the conjecture in a wide range of cases.

v2. The results have been extended to inner forms of GL_n