Deligne-Lusztig Constructions for Division Algebras and the Local Langlands Correspondence

Abstract

Let $K$ be a local non-Archimedean field of positive characteristic and let $L$ be the degree-$n$ unramified extension of $K$. Via the local Langlands and Jacquet-Langlands correspondences, to each sufficiently generic multiplicative character of $L$, one can associate an irreducible representation of the multiplicative group of the central division algebra $D$ of invariant $1/n$ over $K$. In 1979, Lusztig proposed a cohomological construction of supercuspidal representations of reductive $p$-adic groups analogous to Deligne-Lusztig theory for finite reductive groups. In this paper we prove that when $n=2$, the $p$-adic Deligne-Lusztig (ind-)scheme $X$ induces a correspondence between smooth one-dimensional representations of $L^{\times }$ and representations of $D^{\times }$ that matches the correspondence given by the LLC and JLC.

arXiv comment61 pages. Version 2: minor revisions