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arXiv 1909.00511math.NTmath.AG
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关于正特征函数域上阿贝尔簇的$μ$ -不变量

On the $μ$-invariants of abelian varieties over function fields of positive characteristic

King-Fai Lai, Ignazio Longhi, Takashi Suzuki, Ki-Seng Tan, Fabien Trihan

摘要:

设$A$是特征为$p$的全局函数域$K$上的阿贝尔簇.研究了在$K$的非分歧$\mathbb{Z}_p$ -扩张上$A$的Iwasawa理论中出现的$μ$ -不变量.乌尔默认为,这个不变的是等于他所谓的维度的泰特,Shafarevich组的$A$,它确实是维度的一些规范定义的组计划。我们的第一个结果是验证他的建议。他还给出了一个公式的维度泰特,Shafarevich组(这是现在的$μ$不变)方面的其他数量,包括Faltings高度的$A$和Frobenius斜率的分子的哈塞-韦伊$L$ -功能的$A / K$假设的几何Birch-Swinnerton-戴尔公式。我们的下一个结果是证明这个$μ$不变公式无条件的雅可比和半稳定的阿贝尔簇。最后,我们证明了具有一个截面和固定的足够大的欧拉特征的极小椭圆曲面的同构类的模的“$μ=0$“轨迹是一个稠密开子集。

英文摘要:

Let $A$ be an abelian variety over a global function field $K$ of characteristic $p$. We study the $μ$-invariant appearing in the Iwasawa theory of $A$ over the unramified $\mathbb{Z}_p$-extension of $K$. Ulmer suggests that this invariant is equal to what he calls the dimension of the Tate-Shafarevich group of $A$ and that it is indeed the dimension of some canonically defined group scheme. Our first result is to verify his suggestions. He also gives a formula for the dimension of the Tate-Shafarevich group (which is now the $μ$-invariant) in terms of other quantities including the Faltings height of $A$ and Frobenius slopes of the numerator of the Hasse-Weil $L$-function of $A / K$ assuming the conjectural Birch-Swinnerton-Dyer formula. Our next result is to prove this $μ$-invariant formula unconditionally for Jacobians and for semistable abelian varieties. Finally, we show that the "$μ=0$" locus of the moduli of isomorphism classes of minimal elliptic surfaces endowed with a section and with fixed large enough Euler characteristic is a dense open subset.

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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