English

A comparison of endomorphism algebras

Representation Theory 2023-01-25 v1 Number Theory

Abstract

Let FF be a non-archimedean local field and GG be a connected reductive group over FF. For a Bernstein block in the category of smooth complex representations of G(F)G(F), we have two kinds of progenerators: the compactly induced representation indKG(F)(ρ)\text{ind}_{K}^{G(F)} (\rho) of a type (K,ρ)(K, \rho), and the parabolically induced representation IPG(ΠM)I_{P}^{G}(\Pi^{M}) of a progenerator ΠM\Pi^{M} of a Bernstein block for a Levi subgroup MM of GG. In this paper, we construct an explicit isomorphism of these two progenerators. Moreover, we compare the description of the endomorphism algebra EndG(F)(indKG(F)(ρ))\text{End}_{G(F)}\left(\text{ind}_{K}^{G(F)} (\rho)\right) for a depth-zero type (K,ρ)(K, \rho) by Morris with the description of the endomorphism algebra EndG(F)(IPG(ΠM))\text{End}_{G(F)}\left(I_{P}^{G}(\Pi^{M})\right) by Solleveld, that are described in terms of affine Hecke algebras.

Keywords

Cite

@article{arxiv.2301.09182,
  title  = {A comparison of endomorphism algebras},
  author = {Kazuma Ohara},
  journal= {arXiv preprint arXiv:2301.09182},
  year   = {2023}
}

Comments

94pages

R2 v1 2026-06-28T08:17:24.245Z