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arXiv 1807.04736math.NT
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实二次域上全定四元数代数的极大序模单位群

Unit groups of maximal orders in totally definite quaternion algebras over real quadratic fields

Qun Li, Jiangwei Xue, Chia-Fu Yu

摘要:

本文研究了一类精化类数公式(分别为型数公式)的极大序模,并考虑了右理想类(分别为)的自同构群。极大序模的单位群)。对每个有限非循环群$G$,给出了单位群模中心同构于$G$的极大序模共轭类个数的显式表达式,并给出了每个共轭类的表示式.这导致了一个完整的配方(甚至显式公式在特殊情况下)的细化类数公式的所有有限群。作为应用,我们证明了在所有正特征$p\not\equiv 1\pmod{24}$下,其自同态代数与$\mathbb{Q}(\sqrt{p})$重合的超特殊阿贝尔曲面的存在性.

英文摘要:

We study a form of refined class number formula (resp. type number formula) for maximal orders in totally definite quaternion algebras over real quadratic fields, by taking into consideration the automorphism groups of right ideal classes (resp. unit groups of maximal orders). For each finite noncyclic group $G$, we give an explicit formula for the number of conjugacy classes of maximal orders whose unit groups modulo center are isomorphic to $G$, and write down a representative for each conjugacy class. This leads to a complete recipe (even explicit formulas in special cases) for the refined class number formula for all finite groups. As an application, we prove the existence of superspecial abelian surfaces whose endomorphism algebras coincide with $\mathbb{Q}(\sqrt{p})$ in all positive characteristic $p\not\equiv 1\pmod{24}$.

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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