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arXiv 2107.13613math.NT
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关于半稳定约化度

On the degree of semi-stable reduction

Séverin Philip

摘要:

对于数域上的交换阿贝尔簇$A$,我们研究了在其上$A$获得半稳定约化的域扩张的最小度$d(A)$的仅依赖于$A$维数的界.我们首先计算$d(A)$的基数的有限monodromy群的$A$,导致一个限制在$d(A)$的经典Minkowski界。然后,我们证明了这个界是紧到它的$2$ -部分考虑$p$ -进覆盖的局部点的一个通用阿贝尔计划。

英文摘要:

For an abelian variety $A$ over a number field we study bounds depending only on the dimension of $A$ for the minimal degree $d(A)$ of a field extension over which $A$ acquires semi-stable reduction. We first compute $d(A)$ in terms of the cardinalities of the finite monodromy groups of $A$ which leads to a bound on $d(A)$ in terms of the classical Minkowski bound. We then show this bound is tight up to its $2$-part by considering $p$-adic coverings of the local points of a universal abelian scheme.

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