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arXiv math/9806146math.AGhep-th
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关于Calabi-Yau orbifold的去奇异化拓扑

On the topology of desingularizations of Calabi-Yau orbifolds

Dominic Joyce

摘要:

设X/G是一个具有余维2奇点的三维Calabi-Yau orbifold。McKay对应(Reid,Ito)描述了X/G的crepant分解的拓扑。我们研究了通过变形X/G的复结构而产生的Calabi-Yau 3-folds Y。麦凯对应不适用于这样的Y。我们用X/G的奇异集的“外尔群”来描述Y的拓扑.即使在简单的例子中,这也可以给出许多不同的方法来对X/G进行去奇异化。在弦论中解释这些结果是很有趣的,这将导致轨道CFT概念的推广,类似于“离散挠率”(Vafa,Witten)的概念。

英文摘要:

Let X/G be a 3-dimensional Calabi-Yau orbifold with codimension 2 singularities. The topology of crepant resolutions of X/G is described by the McKay correspondence (Reid, Ito). We study Calabi-Yau 3-folds Y that arise by deforming the complex structure of X/G. The McKay correspondence does not hold for such Y. We describe the topology of Y using the `Weyl group' of the singular set of X/G. Even in simple examples, this can give many different ways to desingularize X/G. It would be interesting to interpret these results in String Theory, which should lead to a generalization of the idea of orbifold CFT, similar to the idea of `discrete torsion' (Vafa, Witten).

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