arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.4517math.AGmath.DS
收藏

$\mathbb{P}^{n}$上态射空间的半稳定约化问题

The Semistable Reduction Problem for the Space of Morphisms on $\mathbb{P}^{n}$

Alon Levy

摘要:

本文在$\mathbb{P}^{n}$上的态射空间的背景下,重新陈述了几何不变理论中的半稳定约化定理。对于楼下的每一条完整曲线$C$,我们在抽象曲线$D$上得到一个$\mathbb{P}^{n}$ -丛,该抽象曲线$D$将有限对一映射到$C$上,其平凡化对应于楼上的不一定完整的曲线,其态射对应于用该点所表示的态射来标识每个纤维。找到一个平凡的丛相当于找到一个完整的$D$楼上映射有限到$C$ ;我们证明,在每个空间的态射,存在一个曲线$C$,没有这样的$D$存在。当$D$存在时,我们用$C$来定义从$D$到$C$的映射的度,使$C$有理且包含在稳定空间中.

英文摘要:

We restate the semistable reduction theorem from geometric invariant theory in the context of spaces of morphisms on $\mathbb{P}^{n}$. For every complete curve $C$ downstairs, we get a $\mathbb{P}^{n}$-bundle on an abstract curve $D$ mapping finite-to-one onto $C$, whose trivializations correspond to not necessarily complete curves upstairs with morphisms corresponding to identifying each fiber with the morphism the point represents. Finding a trivial bundle is equivalent to finding a complete $D$ upstairs mapping finite-to-one onto $C$; we prove that in every space of morphisms, there exists a curve $C$ for which no such $D$ exists. In the case when $D$ exists, we bound the degree of the map from $D$ to $C$ in terms of $C$ for $C$ rational and contained in the stable space.

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。

↑