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arXiv 0903.1245math.AGmath.GR
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从Berkovich视角看Bruhat-Tits理论 I——建筑的实现与紧化

Bruhat-Tits Theory from Berkovich's Point of View. I - Realizations and Compactifications of Buildings

Bertrand Rémy, Amaury Thuillier, Annette Werner

AI总结:

该研究利用Berkovich解析几何研究Bruhat-Tits建筑的紧化,构造了从建筑到对应解析空间的映射并得到紧化族,推广了分裂群情形的结果,还刻画了紧化边界层并证明边界点稳定子群的混合Bruhat分解定理。

摘要:

我们借助完备非阿基米德域上的Berkovich解析几何,研究Bruhat-Tits建筑及其紧化。对于合适的非阿基米德域k上的任意约化群G,我们定义了从Bruhat-Tits建筑B(G,k)到与G关联的Berkovich解析空间G^an的映射。将该映射与G^an到其旗簇的投影复合,我们定义了一族B(G,k)的紧化,这推广了Berkovich在分裂群情形下的结果。此外,我们证明紧化建筑的边界层恰好是与一类抛物子群相关联的Bruhat-Tits建筑。我们还研究了边界点的稳定子群,并证明了适用于它们的混合Bruhat分解定理。

英文摘要:

We investigate Bruhat-Tits buildings and their compactifications by means of Berkovich analytic geometry over complete non-Archimedean fields. For every reductive group G over a suitable non-Archimedean field k we define a map from the Bruhat-Tits building B(G,k) to the Berkovich analytic space Gan asscociated with G. Composing this map with the projection of G^an to its flag varieties, we define a family of compactifications of B(G,k). This generalizes results by Berkovich in the case of split groups. Moreover, we show that the boundary strata of the compactified buildings are precisely the Bruhat-Tits buildings associated with a certain class of parabolics. We also investigate the stabilizers of boundary points and prove a mixed Bruhat decomposition theorem for them.

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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