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arXiv math/0603500math.KTmath-phmath.MPmath.OA
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循环上同调和divisor流中的相对配对

Relative pairing in cyclic cohomology and divisor flows

Matthias Lesch, Henri Moscovici, Markus Pflaum

摘要:

我们构造了多参数相关伪微分算子的相对K-理论类的不变量,恢复和推广了Melrose的因子流及其高奇维版本的Lesch和Pflaum.这些高阶因子流是通过将相对K-理论模符号与由正则算子迹及其符号边界构造的相对闭链的循环上同调特征配对而得到的。除了对除数流的所有基本特征给出清晰和概念性的解释外,这种构造还可以揭示以前未知的偶维对应物。此外,它赋予这些不变量的整体一个纯粹的拓扑解释,即实现经典的博特周期性同构的方式兼容的纬垂同构在K-理论和循环上同调。我们还给出了一个精确的配方,在一个自然的Clifford代数悬挂,高因子流和频谱流之间的关系。

英文摘要:

We construct invariants of relative K-theory classes of multiparameter dependent pseudodifferential operators, which recover and generalize Melrose's divisor flow and its higher odd-dimensional versions of Lesch and Pflaum. These higher divisor flows are obtained by means of pairing the relative K-theory modulo the symbols with the cyclic cohomological characters of relative cycles constructed out of the regularized operator trace together with its symbolic boundary. Besides giving a clear and conceptual explanation to all the essential features of the divisor flows, this construction allows to uncover the previously unknown even-dimensional counterparts. Furthermore, it confers to the totality of these invariants a purely topological interpretation, that of implementing the classical Bott periodicity isomorphisms in a manner compatible with the suspension isomorphisms in both K-theory and in cyclic cohomology. We also give a precise formulation, in terms of a natural Clifford algebraic suspension, for the relationship between the higher divisor flows and the spectral flow.

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