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- W4309840639 abstract "In [Inventiones mathematicae, 184 (2011)], Vollaard and Wedhorn defined a stratification on the special fiber of the unitary unramified PEL Rapoport-Zink space with signature $(1,n-1)$. They constructed an isomorphism between the closure of a stratum, called a closed Bruhat-Tits stratum, and a Deligne-Lusztig variety which is not of classical type. In this paper, we describe the $ell$-adic cohomology groups over $overline{mathbb Q_{ell}}$ of these Deligne-Lusztig varieties, where $ell not = p$. The computations involve the spectral sequence associated to the Ekedahl-Oort stratification of a closed Bruhat-Tits stratum, which translates into a stratification by Coxeter varieties whose cohomology is known. Eventually, we find out that the irreducible representations of the finite unitary group which appear inside the cohomology contribute to only two different unipotent Harish-Chandra series, one of them belonging to the principal series." @default.
- W4309840639 created "2022-11-29" @default.
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- W4309840639 date "2022-11-23" @default.
- W4309840639 modified "2023-10-16" @default.
- W4309840639 title "COHOMOLOGY OF THE BRUHAT–TITS STRATA IN THE UNRAMIFIED UNITARY RAPOPORT–ZINK SPACE OF SIGNATURE" @default.
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- W4309840639 doi "https://doi.org/10.1017/nmj.2022.39" @default.
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