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arXiv 0904.4744math.KTmath.GT
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等变KK-理论中的对偶、对应和Lefschetz映射

Duality, correspondences and the Lefschetz map in equivariant KK-theory: a survey

Heath Emerson

摘要:

我们调查工作的作者和拉尔夫迈耶等变KK理论。二元性在我们的方法中起着关键作用。我们组织的调查周围的目标计算一定的同伦不变的空间配备了适当的行动组或广群称为莱夫谢茨地图。Lefschetz映射将等变K-同调类与容许对偶的空间X的等变Kasparov自态映射联系起来。我们想在真广群的底空间上的光滑流形丛的背景下明确地描述它,其中广群元通过纤维之间的单同态起作用。为了得到所需的描述,我们描述了一个拓扑模型的等变KK-理论的对应理论的方式,建立在保罗鲍姆,阿兰康纳斯和乔治斯Skandalis的想法,出现在20世纪80年代。在等变向量丛存在的某些技术条件下,该模型与光滑流形丛的解析模型一致。在这些条件下,我们得到了计算的莱夫谢茨映射在纯粹的拓扑条件。

英文摘要:

We survey work by the author and Ralf Meyer on equivariant KK-theory. Duality plays a key role in our approach. We organize the survey around the objective of computing a certain homotopy-invariant of a space equipped with a proper action of a group or groupoid called the Lefschetz map. The Lefschetz map associates an equivariant K-homology class to an equivariant Kasparov self-morphism of a space X admitting a dual. We want to describe it explicitly in the setting of bundles of smooth manifolds over the base space of a proper groupoid, in which groupoid elements act by diffeomorphisms between fibres. To get the required description we describe a topological model of equivariant KK-theory by way of a theory of correspondences, building on ideas of Paul Baum, Alain Connes and Georges Skandalis that appeared in the 1980's. This model agrees with the analytic model for bundles of smooth manifolds under some technical conditions related to the existence of equivariant vector bundles. Subject to these conditions we obtain a computation of the Lefschetz map in purely topological terms.

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