中文

论分支阿贝尔覆盖的存在性

代数几何 2023-10-10 v3

摘要

给定代数闭域 K\mathbb K 上的正规完备簇 YYYY 的不同有效 Weil 除子 D1,...DnD_1,... D_n 以及正整数 d1,...dnd_1,... d_n,我们阐明了在 DiD_i 上以阶数 did_i 分支的 YY 的阿贝尔覆盖存在的条件。作为一个应用,我们证明了:若 K\mathbb K 的特征为 0,或者该覆盖是次数不被特征整除的 Galois 覆盖,则在环面不变除子上分支的正规完备环面簇的覆盖本身也是一个环面簇。

关键词

引用

@article{arxiv.1210.6174,
  title  = {On the existence of ramified abelian covers},
  author = {Valery Alexeev and Rita Pardini},
  journal= {arXiv preprint arXiv:1210.6174},
  year   = {2023}
}

备注

Dedicated to Alberto Conte on his 70th birthday. Version 3: Thm. 3.7 has been reformulated. We thank Boaz Moerman for pointing out that the earlier version of this result was incorrect