中文

四阶循环覆盖的精炼局部提升问题

代数几何 2023-09-19 v4 数论

摘要

ϕ\phi是代数闭域kk(特征为22)上一条曲线的Z/4\mathbb{Z}/4-覆盖,Φ1\Phi_1ϕ\phiZ/2\mathbb{Z}/2-子覆盖到一个特征为零的完全离散赋值环RR的一个\emph{良好}提升。我们证明存在RR的一个有限扩张RR'(由Φ1\Phi_1确定),以及ϕ\phiRR'的一个提升Φ\Phi,使得其Z/2\mathbb{Z}/2-子覆盖同构于Φ1RR\Phi_1 \otimes_R R'。该结果给出了一类Sa{"i}di精炼提升猜想成立的非平凡循环覆盖族。此外,本稿展示了一些现象,或可对数以狂分歧Galois覆盖为参数的神秘模空间有所启发。

关键词

引用

@article{arxiv.2107.01780,
  title  = {The refined local lifting problem for cyclic covers of order four},
  author = {Huy Dang},
  journal= {arXiv preprint arXiv:2107.01780},
  year   = {2023}
}

备注

There were some gaps in section 4 of the previous version. The current result is now weaker than a known one but uses a different approach. We may consider replacing this manuscript with another one that yields a stronger result