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arXiv 2407.01170math.DGmath.FA
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几何奇点与Hodge理论

Geometric singularities and Hodge theory

Lashi Bandara, Georges Habib

AI总结:

本文研究非光滑几何数据下Hodge-Dirac算子核的稳定性,证明其在均匀扰动下保持同构,并应用于粗糙黎曼度量,得出紧致情形下核与上同调同构的结论。

摘要:

我们考虑光滑流形上配备非光滑几何数据的光滑向量丛。对于作用在这些向量丛上的幂零微分算子,我们证明在几何数据的均匀扰动下,所诱导的Hodge-Dirac型算子的核保持同构。我们将此应用于由所谓的粗糙黎曼度量(其正则性可仅为可测系数)在紧致与非紧致情形下所诱导的微分形式上的Hodge-Dirac算子。作为推论,我们证明当底流形紧致时,关于粗糙黎曼度量的相关非光滑Hodge-Dirac算子的核与光滑上同调及奇异上同调保持同构。

英文摘要:

We consider smooth vector bundles over smooth manifolds equipped with non-smooth geometric data. For nilpotent differential operators acting on these bundles, we show that the kernels of induced Hodge-Dirac-type operators remain isomorphic under uniform perturbations of the geometric data. We consider applications of this to the Hodge-Dirac operator on differential forms induced by so-called rough Riemannian metrics, which can be of only measurable coefficient in regularity, on both compact and non-compact settings. As a consequence, we show that the kernel of the associated non-smooth Hodge-Dirac operator with respect to a rough Riemannian metric remains isomorphic to smooth and singular cohomology when the underlying manifold is compact.

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