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arXiv 0707.3207math.KTmath.OA
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紧李群在C ~*-代数上作用的指标理论

Index theory for actions of compact Lie groups on C*-algebras

Charlotte Wahl

摘要:

研究C*-代数上紧李群作用的指标理论,重点是主作用。给定C*-代数上的不变半有限迹,我们得到半有限谱三元组.对于圆作用,我们考虑与对偶Pimsner-Voiculescu序列的关系。在此过程中,我们证明了紧李群作用的“饱和”和“主要”概念是等价的。

英文摘要:

We study the index theory for actions of compact Lie groups on C*-algebras with an emphasis on principal actions. Given an invariant semifinite trace on the C*-algebra we obtain semifinite spectral triples. For circle actions we consider the relation to the dual Pimsner-Voiculescu sequence. On the way we show that the notions ``saturated'' and ``principal'' are equivalent for actions by compact Lie groups.

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