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arXiv 0712.3202math.SGmath.AT
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K-理论中Hamilton圈群的Kirwan满射性

Kirwan surjectivity in K-theory for Hamiltonian loop group quotients

Megumi Harada, Paul Selick

摘要:

设G是一个紧李群,LG是其相关的循环群。本文的主要结果是从Hamilton LG-空间的等变K-理论到其Hamilton LG-商的积分K-理论的满射性定理。我们的结果是一个K-理论模拟以前的工作在合理的Borel等变上同调的博特,托尔曼和魏茨曼。我们的证明技巧与博特、托尔曼和韦茨曼的不同之处在于,他们明确地使用了博雷尔构造,这是我们在等变K-理论中没有的;我们直接构造G-等变同伦等价来获得等变K-理论中必要的同构。主定理也应该被看作是在K-理论中对拟哈密顿G-空间及其相关的拟哈密顿子空间的类似定理的第一步。

英文摘要:

Let G be a compact Lie group and LG its associated loop group. The main result of this manuscript is a surjectivity theorem from the equivariant K-theory of a Hamiltonian LG-space onto the integral K-theory of its Hamiltonian LG-quotient. Our result is a K-theoretic analogue of previous work in rational Borel-equivariant cohomology of Bott, Tolman, and Weitsman. Our proof techniques differ from that of Bott, Tolman, and Weitsman in that they explicitly use the Borel construction, which we do not have at our disposal in equivariant K-theory; we instead directly construct G-equivariant homotopy equivalences to obtain the necessary isomorphisms in equivariant K-theory. The main theorem should also be viewed as a first step toward a similar theorem in K-theory for quasi-Hamiltonian G-spaces and their associated quasi-Hamiltonian quotients.

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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