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On modulo $\ell$ cohomology of $p$-adic Deligne-Lusztig varieties for $GL_n$

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arXiv:2404.11176v1 Announce Type: cross
Abstract: In 1976, Deligne and Lusztig realized the representation theory of finite groups of Lie type inside \'etale cohomology of certain algebraic varieties. Recently, a $p$-adic version of this theory started to emerge: there are $p$-adic Deligne-Lusztig spaces, whose cohomology encodes representation theoretic information for $p$-adic groups - for instance, it partially realizes local Langlands correspondence with characteristic zero coefficients. However, the parallel case of coefficients of positive characteristic $\ell \neq p$ has not been inspected so far. The purpose of this article is to initiate such an inspection. In particular, we relate cohomology of certain $p$-adic Deligne-Lusztig spaces to Vign\'eras's modular local Langlands correspondence for $\mathbf{GL}_n$.

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