On the unicity of types in special linear groups

Abstract

Let $F$ be a non-archimedean local field. We show that any representation of a maximal compact subgroup of ${\mathbf{SL}}_N(F)$ which is typical for an essentially tame supercuspidal representation must be induced from a Bushnell--Kutzko maximal simple type. From this, we explicitly count and describe the conjugacy classes of such typical representations, and give an explicit description of an inertial Langlands correspondence for essentially tame irreducible $N$-dimensional projective representations of the Weil group of $F$.

arXiv commentThe paper has been extensively rewritten. The result was too strong as previously claimed; the proof is valid only for essentially tame representations. 20 pages