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arXiv 1002.3520math.AGmath.COmath.GR
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分歧酉群局部模型的拓扑平坦性。I.奇维情形

Topological flatness of local models for ramified unitary groups. I. The odd dimensional case

Brian D. Smithling

摘要:

局部模型是根据线性代数模问题定义的某些方案,其给出由Rapoport和Zink定义的某些p-adic PEL Shimura簇的积分模型的étale局部邻域。当定义志村簇的群在p处分歧时,最初定义的局部模型(以及志村模型)可能不是平坦的,并且需要修改它们的定义以获得平坦的方案。在酉相似群在Q_p处的局部化是分歧的情况下,准分裂GU_n,Pappas和Rapoport在定义原局部模型的模问题上增加了新的条件,即所谓的楔条件和旋条件,并证明了新的局部模型是平坦的。我们证明了他们猜想的一个初步形式,即他们的新模型是拓扑平坦的,在n是奇数的情况下。

英文摘要:

Local models are certain schemes, defined in terms of linear-algebraic moduli problems, which give étale-local neighborhoods of integral models of certain p-adic PEL Shimura varieties defined by Rapoport and Zink. When the group defining the Shimura variety ramifies at p, the local models (and hence the Shimura models) as originally defined can fail to be flat, and it becomes desirable to modify their definition so as to obtain a flat scheme. In the case of unitary similitude groups whose localizations at Q_p are ramified, quasi-split GU_n, Pappas and Rapoport have added new conditions, the so-called wedge and spin conditions, to the moduli problem defining the original local models and conjectured that their new local models are flat. We prove a preliminary form of their conjecture, namely that their new models are topologically flat, in the case n is odd.

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