English

Ordinary $GL_2(F)$-representations in characteristic two via affine Deligne-Lusztig constructions

Algebraic Geometry 2018-02-08 v1 Representation Theory

Abstract

The group \GL2\GL_2 over a local field with (residue) characteristic 22 possesses much more smooth supercuspidal \ell-adic representations, than over a local field of residue characteristic >2> 2. One way to construct these representations is via the theory of types of Bushnell-Kutzko. We construct many of them in the cohomology of certain extended affine Deligne-Lusztig varieties attached to \GL2\GL_2 and wildly ramified maximal tori in it. Then we compare our construction with the type-theoretic one. The corresponding extended affine Deligne-Lusztig varieties were introduced in a preceding article. Also in the present case they turn out to be zero-dimensional.

Keywords

Cite

@article{arxiv.1802.02456,
  title  = {Ordinary $GL_2(F)$-representations in characteristic two via affine Deligne-Lusztig constructions},
  author = {Alexander B. Ivanov},
  journal= {arXiv preprint arXiv:1802.02456},
  year   = {2018}
}

Comments

27 pages