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arXiv 2603.09754math.NT
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对于函数域上算术群的布鲁hat-蒂茨建筑中的不稳定复杂

The unstable complex in Bruhat-Tits buildings for arithmetic groups over function fields

Heidelberg University(海德堡大学)

Gebhard Böckle, Sriram Chinthalagiri Venkata

AI总结:

本文研究了函数域上算术群的布鲁hat-蒂茨建筑中不稳定复杂结构,通过修改格雷森的方法,证明了主同余子群的不稳定区域与球形蒂茨建筑的同调等价。

摘要:

令K为正特征下的函数域,∞为K中的固定位置,K_∞为K在∞处的完备化。根据塞雷的工作,对于合适的算术子群Γ⊂GL₂(K),GL₂(K_∞)的布鲁hat-蒂茨树的Γ-不稳定区域自然同调等价于GL₂(K)的球形蒂茨建筑。格雷森在奎伦的思想基础上,将这种同调等价推广到GL_r(K_∞)的布鲁hat-蒂茨建筑的非半稳定部分。修改格雷森描述的方法,我们也能证明对于Γ⊂GL_r(K)的主同余子群,Γ-不稳定区域的类似同调等价。

英文摘要:

Let $K$ be a function field in positive characteristic, $\infty$ be a fixed place of $K$ and $K_\infty$ be the completion of $K$ at $\infty$. By the work of Serre, it is well known that, for a suitable arithmetic subgroup $Γ\subset GL_2(K)$, the $Γ$-unstable region of the Bruhat-Tits tree for $GL_2(K_\infty)$ is naturally homotopy equivalent to the spherical Tits building for $GL_2(K)$. Grayson, following Quillen's ideas, generalizes this homotopy equivalence to the non-semistable part of the Bruhat-Tits building for $GL_r(K_\infty)$. Modifying the approach described by Grayson, we are also able show a similar homotopy equivalence for the $Γ$-unstable region, for $Γ\subset GL_r(K)$ a principal congruence subgroup.

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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