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arXiv 0907.3211math.DGmath.AT
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等变上同调与归结

Equivariant cohomology and resolution

Pierre Albin, Richard Melrose

摘要:

证明了在角点流形上紧李群的光滑作用可以通过迭代blow-up(正则)分解为具有唯一的各向同性型的“民间定理”.这个过程被证明是捕捉所有各向同性类型的同时分辨率在一个“分辨率塔”项目的决议,迭代边界纤维化的商。等变K-理论和Cartan模型的等变上同调跟踪下的决议程序是离域等变上同调的鲍姆,Brylinski和麦克弗森。这导致了这些上同调理论中的每一个的解析模型,在相对对象的分辨率塔,因此到降阶模型作为平扭曲相对对象的商的分辨率。其结果是一个明确的等变陈特征的构造,基本上在非等变的情况下,在决议的商。

英文摘要:

The `Folk Theorem' that a smooth action by a compact Lie group can be (canonically) resolved, by iterated blow up, to have unique isotropy type is proved in the context of manifolds with corners. This procedure is shown to capture the simultaneous resolution of all isotropy types in a `resolution tower' which projects to a resolution, with iterated boundary fibration, of the quotient. Equivariant K-theory and the Cartan model for equivariant cohomology are tracked under the resolution procedure as is the delocalized equivariant cohomology of Baum, Brylinski and MacPherson. This leads to resolved models for each of these cohomology theories, in terms of relative objects over the resolution tower and hence to reduced models as flat-twisted relative objects over the resolution of the quotient. As a result an explicit equivariant Chern character is constructed, essentially as in the non-equivariant case, over the resolution of the quotient.

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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