English

Wild blocks of type $A$ Hecke algebras are strictly wild

Representation Theory 2025-05-12 v3 Rings and Algebras

Abstract

We prove that all wild blocks of type AA Hecke algebras with quantum characteristic e3e \geqslant 3 -- i.e. blocks of weight at least 22 -- are strictly wild, with the possible exception of the weight 22 Rouquier block for e=3e = 3. As a corollary, we show that for e3e \geqslant 3, all wild blocks of the qq-Schur algebras are strictly wild, without exception.

Keywords

Cite

@article{arxiv.2408.16477,
  title  = {Wild blocks of type $A$ Hecke algebras are strictly wild},
  author = {Liron Speyer},
  journal= {arXiv preprint arXiv:2408.16477},
  year   = {2025}
}

Comments

23 pages, comments welcome. v2 includes an analogous result for q-Schur algebras. v3 includes some fixes of small typos, and some other minor improvements. This is the final version, to appear in the Bulletin of the London Mathematical Society, with some extra detail in the arXiv version