English

Weights for $\ell$-local compact groups

Group Theory 2023-09-11 v4 Algebraic Topology Representation Theory

Abstract

In this note, we initiate the study of F\mathcal{F}-weights for an \ell-local compact group F\mathcal{F} over a discrete \ell-toral group SS with discrete torus TT. Motivated by Alperin's Weight Conjecture for simple groups of Lie-type, we conjecture that when TT is the unique maximal abelian subgroup of SS up to F\mathcal{F}-conjugacy and every element of SS is F\mathcal{F}-fused into TT, the number of weights of F\mathcal{F} is bounded above by the number of ordinary irreducible characters of its Weyl group. By combining the structure theory of F\mathcal{F} with the theory of blocks with cyclic defect group, we are able to give a proof of this conjecture in the case when F\mathcal{F} is simple and S:T=|S:T| =\ell. We also propose and give evidence for an analogue of the height zero case of Robinson's Ordinary Weight conjecture in this setting.

Keywords

Cite

@article{arxiv.2208.12762,
  title  = {Weights for $\ell$-local compact groups},
  author = {Jason Semeraro},
  journal= {arXiv preprint arXiv:2208.12762},
  year   = {2023}
}

Comments

12 pages

R2 v1 2026-06-25T02:00:46.633Z