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arXiv 2005.06884math.DG
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示性数的体积比较定理

A volume comparison theorem for characteristic numbers

Daniel Luckhardt

摘要:

证明了在里奇曲率和内射半径的下界下,包含所有Pontryagin数和Chern数的黎曼流形的某些示性数的绝对值与体积成比例地有界.这个证明依赖于陈-魏尔理论,该理论应用于从图上的欧几里得连接构造的连接,其中度量张量是调和的,并且具有有界的霍德尔范数。我们把这个定理推广到了一个由Hölder正则性定义的粗糙黎曼流形的Gromov-Hausdorff闭类。假设一个额外的上里奇曲率界,我们表明,也欧拉示性数有界的体积成比例。另外,我们还讨论了具有截面曲率附加上界的流形的贝蒂数的体积比较定理.这是鲍恩的一个结果的结果。

英文摘要:

We show that assuming lower bounds on the Ricci curvature and the injectivity radius the absolute value of certain characteristic numbers of a Riemannian manifold, including all Pontryagin and Chern numbers, is bounded proportionally to the volume. The proof relies on Chern-Weil theory applied to a connection constructed from Euclidean connections on charts in which the metric tensor is harmonic and has bounded Hölder norm. We generalize this theorem to a Gromov-Hausdorff closed class of rough Riemannian manifolds defined in terms of Hölder regularity. Assuming an additional upper Ricci curvature bound, we show that also the Euler characteristic is bounded proportionally to the volume. Additionally, we remark on a volume comparison theorem for Betti numbers of manifolds with an additional upper bound on sectional curvature. It is a consequence of a result by Bowen.

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