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arXiv 0907.5214math.AGmath.DG
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加权射影嵌入、轨道折叠的稳定性和常数数量曲率Kähler度量

Weighted projective embeddings, stability of orbifolds and constant scalar curvature Kähler metrics

J. Ross, R. P. Thomas

摘要:

我们通过Kodaira嵌入的加权形式,将具有循环稳定子群的极化orbifolds嵌入到加权射影空间中。除以加权射影空间的(非约化)自同构,则形式上给出一个轨道折叠的模空间。我们将展示如何表达这作为一个还原商,所以一个GIT问题,从而定义了一个概念的稳定性orbifolds。然后,我们证明了一个轨道版本的唐纳森定理:存在一个轨道Kahler度量常数数量曲率意味着K-半稳定性。通过将斜率稳定性的概念推广到轨道上,我们得到了一个明确的阻碍常数数量曲率轨道Kahler度量存在的条件。我们描述了这个orbifold结果的多方面应用,并显示了有多少以前已知的结果(Troyanov,Ghigi-Kollar,Rollin-Singer,AdS/CFT Sasaki-Einstein障碍的Gaunten-Martelli-Sparks-Yau)适合这个框架。

英文摘要:

We embed polarised orbifolds with cyclic stabiliser groups into weighted projective space via a weighted form of Kodaira embedding. Dividing by the (non-reductive) automorphisms of weighted projective space then formally gives a moduli space of orbifolds. We show how to express this as a reductive quotient and so a GIT problem, thus defining a notion of stability for orbifolds. We then prove an orbifold version of Donaldson's theorem: the existence of an orbifold Kahler metric of constant scalar curvature implies K-semistability. By extending the notion of slope stability to orbifolds we therefore get an explicit obstruction to the existence of constant scalar curvature orbifold Kahler metrics. We describe the manifold applications of this orbifold result, and show how many previously known results (Troyanov, Ghigi-Kollar, Rollin-Singer, the AdS/CFT Sasaki-Einstein obstructions of Gauntlett-Martelli-Sparks-Yau) fit into this framework.

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