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arXiv 1608.04891math.NT
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覆盖p-adic Shimura曲线的Mumford曲线及其基本区

Mumford curves covering p-adic Shimura curves and their fundamental domains

Laia Amorós, Piermarco Milione

摘要:

我们给出了一个明确的描述基本区相关的$p$ -adic均匀化的家庭志村曲线的判别$Dp$和水平$N\geq 1$,单侧理想类数$h(D,N)$是$1$。所得结果推广了\cite [第九章]{Gerritzen_vanderPut 1980}中判别$2p$和水平$N=1$的Shimura曲线的结果。我们在这里提出的方法,使我们能够找到芒福德曲线覆盖志村曲线,连同一个免费的系统的相关肖特基群,$p$ -adic好基本区和他们的稳定约简图的生成器。这是基于一个详细的研究的模块算术的Eichler为了水平$N$内的确定四元数代数的判别$D$,我们概括了经典的结果赫尔维茨\cite{Hurwitz1896}。作为应用,我们证明了所考虑的Shimura曲线族的长度在$p$的约化图的一般公式。

英文摘要:

We give an explicit description of fundamental domains associated to the $p$-adic uniformisation of families of Shimura curves of discriminant $Dp$ and level $N\geq 1$, for which the one-sided ideal class number $h(D,N)$ is $1$. The obtained results generalise those in \cite[Ch. IX]{Gerritzen_vanderPut1980} for Shimura curves of discriminant $2p$ and level $N=1$. The method we present here enables us to find Mumford curves covering Shimura curves, together with a free system of generators for the associated Schottky groups, $p$-adic good fundamental domains and their stable reduction-graphs. This is based on a detailed study of the modular arithmetic of an Eichler order of level $N$ inside the definite quaternion algebra of discriminant $D$, for which we generalise classical results of Hurwitz \cite{Hurwitz1896}. As an application, we prove general formulas for the reduction-graphs with lengths at $p$ of the considered families of Shimura curves.

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