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arXiv 1012.0538math.AG
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曲线的弱真模叠

Weakly proper moduli stacks of curves

Jarod Alper, David Ishii Smyth, Frederick van der Wyck

摘要:

这是第一次在一个计划系列的三篇论文中,我们构建了第二个翻转的日志极小模型程序$\bar{M}_g$。我们引入的概念,弱适当的代数栈,这可能被认为是一个抽象的表征,这些轻度非分离模的几何不变理论(GIT)的背景下遇到的问题,并开发技术证明栈是弱适当的,没有通常的半稳定性分析GIT。我们定义了一个序列的模量堆栈的曲线涉及节点,尖点,tacnodes,和rampphoid尖点,并使用上述技术来表明,这些堆栈是弱适当的。这将是在即将到来的工作中,我们将证明,这些模栈有投影好模空间,这是$\bar{M}_g$的对数正则模型的关键成分。

英文摘要:

This is the first in a projected series of three papers in which we construct the second flip in the log minimal model program for $\bar{M}_g$. We introduce the notion of a weakly proper algebraic stack, which may be considered as an abstract characterization of those mildly non-separated moduli problems encountered in the context of Geometric Invariant Theory (GIT), and develop techniques for proving that a stack is weakly proper without the usual semistability analysis of GIT. We define a sequence of moduli stacks of curves involving nodes, cusps, tacnodes, and ramphoid cusps, and use the aforementioned techniques to show that these stacks are weakly proper. This will be the key ingredient in forthcoming work, in which we will prove that these moduli stacks have projective good moduli spaces which are log canonical models for $\bar{M}_g$.

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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