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arXiv 2305.04448math.NTmath.GR
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$S$-算术群在Bruhat-Tits树的乘积上的简单传递作用

$S$-arithmetic groups acting simply transitively on products of Bruhat-Tits trees

Jonah Mendel, Jiahui Yu

AI总结:

针对全定四元数代数上的Bruhat-Tits树,利用Kirschmer和Voight的分类,构造了几乎对所有素理想简单传递作用的同余算术格,并推广到树的乘积,产生新的Ramanujan Cayley图与立方复形。

摘要:

Lubotzky 提出,由全定四元数代数产生的 Bruhat--Tits 树上的传递 $\mathfrak{p}$-算术作用何时可以细化为简单传递作用。我们利用 Kirschmer 和 Voight 的分类,对全定四元数代数 $B$ 在数域 $K$ 上的类数一极大序 $\mathcal{O}$ 肯定地回答了这个问题。对于除有限个素理想 $\mathfrak{p}$ 外的所有素理想,我们构造了一个与 $\mathcal{O}[1/\mathfrak{p}]^\times/\mathcal{O}_K[1/\mathfrak{p}]^\times$ 可公度的同余算术格,它在相关 Bruhat--Tits 树的顶点上简单传递地作用。我们进一步基于 Rungtanapirom、Stix 和 Vdovina 的工作,证明了对于 Bruhat--Tits 树的乘积的 $S$-算术类似结果。这些简单传递作用产生了许多由全定四元数代数导出的 Ramanujan Cayley 图和 Ramanujan Cayley 正则立方复形的新例子。

英文摘要:

Lubotzky asked when a transitive $\mathfrak{p}$-arithmetic action on a Bruhat--Tits tree arising from a totally definite quaternion algebra can be refined to a simply transitive action. We answer this question affirmatively for class number one maximal orders $\mathcal{O}$ in totally definite quaternion algebras $B$ over number fields $K$, using the classification of Kirschmer and Voight. For all but finitely many prime ideals $\mathfrak{p}$, we construct a congruence arithmetic lattice, commensurable with $\mathcal{O}[1/\mathfrak{p}]^\times/\mathcal{O}_K[1/\mathfrak{p}]^\times$, acting simply transitively on the vertices of the associated Bruhat--Tits tree. We further prove an $S$-arithmetic analogue for products of Bruhat--Tits trees, building on the work of Rungtanapirom, Stix, and Vdovina. These simply transitive actions produce many new examples of Ramanujan Cayley graphs and Ramanujan Cayley regular cubical complexes arising from totally definite quaternion algebras.

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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