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arXiv 1902.07752math.AG
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仿射Deligne-Lusztig簇的线性性质

Finiteness properties of affine Deligne-Lusztig varieties

Paul Hamacher, Eva Viehmann

摘要:

仿射Deligne-Lusztig簇在Shimura簇或$G$ -shtukas模空间的约化中与Newton层的特殊纤维密切相关。在几乎所有情况下,它们都不是拟紧的。本文证明了仿射Deligne-Lusztig簇在极小假设下的有限性。证明了仿射Deligne-Lusztig簇是局部有限型簇,并证明了一个与自然群作用相关的整体有限性结果.类似的结果以前已经知道的特殊情况。

英文摘要:

Affine Deligne-Lusztig varieties are closely related to the special fibre of Newton strata in the reduction of Shimura varieties or of moduli spaces of $G$-shtukas. In almost all cases, they are not quasi-compact. In this note we prove basic finiteness properties of affine Deligne-Lusztig varieties under minimal assumptions on the associated group. We show that affine Deligne-Lusztig varieties are locally of finite type, and prove a global finiteness result related to the natural group action. Similar results have previously been known for special situations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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