Scalar Products of Generic Parahoric Lusztig Inductions

Abstract

Parahoric Lusztig induction gives a broad class of virtual smooth representations of parahoric subgroups in a $p$-adic group, serving as a natural generalization of classical Lusztig induction. This construction has useful applications in the representation theory of $p$-adic groups. In this paper, we prove a scalar product formula for parahoric Lusztig induction under the $(L,G)$-generic condition, which can be viewed as a parahoric analogue of a classical result of Lusztig in 1976. As an application, we describe the irreducible decomposition of the parahoric Deligne-Lusztig representation in the case of elliptic tori.

arXiv comment21 pages