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arXiv 2106.09181math.AGmath.CVmath.DSmath.GRmath.GT
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${Sp}_4(\mathbb{R})$中薄超几何单值群的分圆族

A cyclotomic family of thin hypergeometric monodromy groups in ${Sp}_4(\mathbb{R})$

Simion Filip, Charles Fougeron

摘要:

我们展示了${Sp}_4(\mathbb R)$的一个离散子群的无限族,它具有许多显著的性质。我们的研究结果表明,每组打乒乓球的一组适当的锥。群的出现是超几何微分方程的单值性,其中参数$\left(\tfrac{N-3}{2N},\tfrac{N-1}{2N}, \tfrac{N+1}{2N}, \tfrac{N+3}{2N}\right)$在无穷远处,最大幂单值性在零处,对于任何整数$N\geq 4$。此外,我们涉及的圆锥体用于乒乓球在$\mathbb R^4$与弯曲的表面,然后我们用它来展示域的不连续性的单值群的拉格朗日格拉斯曼。

英文摘要:

We exhibit an infinite family of discrete subgroups of ${Sp}_4(\mathbb R)$ which have a number of remarkable properties. Our results are established by showing that each group plays ping-pong on an appropriate set of cones. The groups arise as the monodromy of hypergeometric differential equations with parameters $\left(\tfrac{N-3}{2N},\tfrac{N-1}{2N}, \tfrac{N+1}{2N}, \tfrac{N+3}{2N}\right)$ at infinity and maximal unipotent monodromy at zero, for any integer $N\geq 4$. Additionally, we relate the cones used for ping-pong in $\mathbb R^4$ with crooked surfaces, which we then use to exhibit domains of discontinuity for the monodromy groups in the Lagrangian Grassmannian.

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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