#### Vol. 4, No. 2, 2022

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Representations of a reductive $p$-adic group in characteristic distinct from $p$

### Guy Henniart and Marie-France Vignéras

Vol. 4 (2022), No. 2, 249–305
##### Abstract

We investigate the irreducible cuspidal $C\phantom{\rule{-0.17em}{0ex}}$-representations of a reductive $p$-adic group $G$ over a field $C$ of characteristic different from $p$. In all known cases, such a representation is the compactly induced representation ${\mathrm{ind}}_{J}^{G}\lambda$ from a smooth $C\phantom{\rule{-0.17em}{0ex}}$-representation $\lambda$ of a compact modulo centre subgroup $J$ of $G$. When $C$ is algebraically closed, for many groups $G$, a list of pairs $\left(J,\lambda \right)$ has been produced, such that any irreducible cuspidal $C\phantom{\rule{-0.17em}{0ex}}$-representation of $G$ has the form ${\mathrm{ind}}_{J}^{G}\lambda$, for a pair $\left(J,\lambda \right)$ unique up to conjugation. We verify that those lists are stable under the action of field automorphisms of $C$, and we produce similar lists when $C$ is no longer assumed algebraically closed. Our other main result concerns supercuspidality. This notion makes sense for the irreducible cuspidal $C\phantom{\rule{-0.17em}{0ex}}$-representations of $G$, but also for the representations $\lambda$ above, which involve representations of finite reductive groups. In most cases we prove that ${\mathrm{ind}}_{J}^{G}\lambda$ is supercuspidal if and only if $\lambda$ is supercuspidal.

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modular representations of reductive $p$-adic groups, cuspidal types, supercuspidal modular representations