The resolvent cocycle in twisted cyclic cohomology and a local index formula for the Podle's sphere

The resolvent cocycle in twisted cyclic cohomology and a local index formula for the Podle's sphere
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扭曲循环上同调中的可解余环和Podle球面的局部指数公式

DOI:
10.4171/jncg/147
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发表时间:
2011
影响因子:
0.9
通讯作者:
R. Senior
R. Senior
中科院分区:
数学3区
文献类型:
--
作者:
A. Rennie;R. Senior

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我们继续在降维现象的背景下研究扭曲同调理论。这项工作统一了之前扭曲循环上同调中的等变指数计算。我们通过在较弱的平滑度假设和更一般的“模”谱三元组设置下证明可分解余循环(JLO 余循环的有限可求类似物)的存在来做到这一点。作为一个应用,我们展示了使用扭曲解析余循环,我们可以获得 Podles 球体的局部指数公式。由此产生的扭曲循环余环具有非零 Hochschild 类,其维度为 2。
We continue the investigation of twisted homology theories in the context of dimen- sion drop phenomena. This work unifies previous equivariant index calculations in twisted cyclic cohomology. We do this by proving the existence of the resolvent cocycle, a finitely summable analogue of the JLO cocycle, under weaker smoothness hypotheses and in the more general setting of 'modular' spectral triples. As an application we show that using our twisted resolvent cocycle, we can obtain a local index formula for the Podles sphere. The resulting twisted cyclic cocycle has non-vanishing Hochschild class which is in dimension 2.
DOI: 10.48550/arxiv.1008.1830
发表时间: 2010
期刊: arXiv e-prints
影响因子: --
作者:
Kraehmer Ulrich
通讯作者: Kraehmer Ulrich