English

Local characters of mod-$\ell$ representations of a $p$-adic reductive group

Representation Theory 2025-10-24 v1 Number Theory

Abstract

We define the ``lifted character'' of mod-\ell representations of pp-adic reductive groups where p\ell\not=p, on compact elements with pro-orders not divisible by \ell. We generalize the local character expansion results of Howe, Harish-Chandra and DeBacker to such lifted characters. We show that the result of Moeglin-Waldspurger and Varma on degenerate Whittaker models is valid for the character expansion.

Keywords

Cite

@article{arxiv.2510.20509,
  title  = {Local characters of mod-$\ell$ representations of a $p$-adic reductive group},
  author = {Cheng-Chiang Tsai},
  journal= {arXiv preprint arXiv:2510.20509},
  year   = {2025}
}

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