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arXiv 1807.08299math.ATmath.DGmath.GRmath.KTmath.RT
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等变K-理论与归结I:阿贝尔作用

Equivariant K-theory and Resolution I: Abelian actions

Panagiotis Dimakis, Richard Melrose

摘要:

紧致李群在紧致流形上的光滑作用可以归结为一个迭代空间,正如皮埃尔·阿尔宾和第二作者所明确指出的那样。在分解上,提升作用具有固定的各向同性类型,在迭代的意义上,具有连接纤维化,并且这种结构下降到商的分解。对于一个阿贝尔群作用,等变K-理论可以用基上的丛来描述,其中态射覆盖了连接映射。一个类似的模型,在适当扭曲的deRham形式的基础上作为一个迭代空间,离域等变上同调的意义上的鲍姆,Brylinski和MacPherson。这种方法允许直接证明他们的等变版本的Atiyah-Hirzebruch同构。

英文摘要:

The smooth action of a compact Lie group on a compact manifold can be resolved to an iterated space, as made explicit by Pierre Albin and the second author. On the resolution the lifted action has fixed isotropy type, in an iterated sense, with connecting fibrations and this structure descends to a resolution of the quotient. For an abelian group action the equivariant K-theory can then be described in terms of bundles over the base with morphisms covering the connecting maps. A similar model is given, in terms of appropriately twisted deRham forms over the base as an iterated space, for delocalized equivariant cohomology in the sense of Baum, Brylinski and MacPherson. This approach allows a direct proof of their equivariant version of the Atiyah-Hirzebruch isomorphism.

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