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arXiv 1306.5659math.DGmath.GT
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族的大时间极限和局部L^2-指标定理

Large time limit and local L^2-index theorems for families

Sara Azzali, Sebastian Goette, Thomas Schick

摘要:

在没有任何额外的正则性假设的情况下,我们明确地计算了L^2-背景下Bismut-Lott型超连接的纤维热算子的大时间极限。这是由某些非紧空间(具有余紧群作用的流形族)上的指数理论所激发的,其中热算子在大时间的收敛性意味着精化的L^2-指数公式。作为应用,我们证明了一个关于签名算子族的局部L^2-指标定理和一个L^2-Bismut-Lott定理,该定理用Kamber-Tandeur类表示平丛的Becker-Gottlieb转移。在正则性稍强的情况下,我们得到了相应的改进形式:我们构造了L^2-eta形式和L^2-挠形式作为海侵形式。

英文摘要:

We compute explicitly, and without any extra regularity assumptions, the large time limit of the fibrewise heat operator for Bismut-Lott type superconnections in the L^2-setting. This is motivated by index theory on certain non-compact spaces (families of manifolds with cocompact group action) where the convergence of the heat operator at large time implies refined L^2-index formulas. As applications, we prove a local L^2-index theorem for families of signature operators and an L^2-Bismut-Lott theorem, expressing the Becker-Gottlieb transfer of flat bundles in terms of Kamber-Tandeur classes. With slightly stronger regularity we obtain the respective refined versions: we construct L^2-eta forms and L^2-torsion forms as transgression forms.

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