arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1801.04845math.AG
收藏

$\mathbb P^1\times\mathbb P^1$的双覆盖PDMATHAAB的GIT与Baily-Borel紧化

GIT versus Baily-Borel compactification for $K3$'s which are double covers of $\mathbb P^1\times\mathbb P^1$

Radu Laza, Kieran O'Grady

摘要:

在以前的工作中,我们已经介绍了一个程序,旨在研究双有理几何的局部对称品种的IV型相关的模的某些投影品种的K3型。特别是,我们的计划的一个具体目标是了解GIT和贝利-博雷尔紧化四次K3表面,K3的,这是一个光滑的二次曲面的双覆盖,双EPW六次曲线之间的关系。在我们的第一篇论文(arXiv:1607.01324)中,基于算术的考虑,我们给出了从上述GIT模空间到相应的Baily-Borel紧化的周期映射的简单双有理变换的拓扑分解。在我们的第二篇论文(arXiv:1612.07432)中,我们研究了四次K3的情况;我们给出了这种分解的几何意义,并部分验证了我们的结构。本文给出了光滑二次曲面的双覆盖K ~ 3的模空间的充分证明。这里主要的新工具是用于(2,4)完全相交曲线的VGIT。

英文摘要:

In previous work, we have introduced a program aimed at studying the birational geometry of locally symmetric varieties of Type IV associated to moduli of certain projective varieties of K3 type. In particular, a concrete goal of our program is to understand the relationship between GIT and Baily-Borel compactifications for quartic K3 surfaces, K3's which are double covers of a smooth quadric surface, and double EPW sextics. In our first paper (arXiv:1607.01324), based on arithmetic considerations, we have given conjectural decompositions into simple birational transformations of the period maps from the GIT moduli spaces mentioned above to the corresponding Baily-Borel compactifications. In our second paper (arXiv:1612.07432) we studied the case of quartic K3's; we have given geometric meaning to this decomposition and we have partially verified our conjectures. Here, we give a full proof of our conjectures for the moduli space of K3's which are double covers of a smooth quadric surface. The main new tool here is VGIT for (2,4) complete intersection curves.

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。

↑