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Representation Theory

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Integral structures in the $p$-adic holomorphic discrete series

Author: Elmar Grosse-Klönne
Journal: Represent. Theory 9 (2005), 354-384
MSC (2000): Primary 14G22
Published electronically: April 19, 2005
MathSciNet review: 2133764
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Abstract: For a local non-Archimedean field $K$ we construct ${\mathrm {GL}}_{d+1}(K)$-equivariant coherent sheaves ${\mathcal V}_{{\mathcal O}_K}$ on the formal ${\mathcal O}_K$-scheme ${\mathfrak X}$ underlying the symmetric space $X$ over $K$ of dimension $d$. These ${\mathcal V}_{{\mathcal O}_K}$ are ${\mathcal O}_K$-lattices in (the sheaf version of) the holomorphic discrete series representations (in $K$-vector spaces) of ${\mathrm {GL}}_{d+1}(K)$ as defined by P. Schneider. We prove that the cohomology $H^t({\mathfrak X},{\mathcal V}_{{\mathcal O}_K})$ vanishes for $t>0$, for ${\mathcal V}_{{\mathcal O}_K}$ in a certain subclass. The proof is related to the other main topic of this paper: over a finite field $k$, the study of the cohomology of vector bundles on the natural normal crossings compactification $Y$ of the Deligne-Lusztig variety $Y^0$ for ${\mathrm {GL}}_{d+1}/k$ (so $Y^0$ is the open subscheme of ${\mathbb P}_k^d$ obtained by deleting all its $k$-rational hyperplanes).

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Elmar Grosse-Klönne
Affiliation: Mathematisches Institut der Universität Münster, Einsteinstrasse 62, 48149 Münster, Germany

Keywords: Drinfel’d symmetric space, holomorphic discrete series, integral structures
Received by editor(s): October 2, 2004
Received by editor(s) in revised form: March 5, 2005
Published electronically: April 19, 2005
Article copyright: © Copyright 2005 American Mathematical Society