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arXiv 0903.0240math.SGmath.DG
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ALE空间中辛上同调和正合拉格朗日量的形变

Deformations of symplectic cohomology and exact Lagrangians in ALE spaces

Alexander F. Ritter

摘要:

证明了ALE空间中唯一的正合拉格朗日子流形是球面。ALE空间是单连通的超Kahler流形,对于SL(2,C)的任意有限子群G,它们在无穷远处看起来像C^2/G。根据ADE Dynkin图,它们可以被实现为2-球面的余切丛的副本的铅垂。证明依赖于辛上同调。

英文摘要:

We prove that the only exact Lagrangian submanifolds in an ALE space are spheres. ALE spaces are the simply connected hyperkahler manifolds which at infinity look like C^2/G for any finite subgroup G of SL(2,C). They can be realized as the plumbing of copies of the cotangent bundle of a 2-sphere according to ADE Dynkin diagrams. The proof relies on symplectic cohomology.

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