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arXiv math/9903171math.DG
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具有里奇曲率下界的流形的几乎刚性和极小体积增长

The Almost Rigidity of Manifolds with Lower Bounds on Ricci Curvature and Minimal Volume Growth

Christina Sormani

摘要:

考虑具有二次衰减里奇曲率下界和极小体积增长的完备非紧黎曼流形.我们首先证明了刚性的结果表明,具有强烈的最小体积增长的结束是等距的翘曲产品流形。接下来,我们考虑几乎刚性的情况下,在非负的和二次衰减的下里奇曲率边界的流形有最小的体积增长。在这样的流形中的紧致区域被证明是渐近接近的Gromov-Hausdorff拓扑中的翘曲产品。具有非负里奇曲率和线性体积增长的流形具有渐近接近等距积的区域。的证明涉及到仔细分析的Busemann功能,这些流形上使用最近开发的Cheeger冷几乎刚性理论。此外,我们表明,在这样的流形的Busemann函数的水平集的直径次线性增长。

英文摘要:

We consider complete noncompact Riemannian manifolds with quadratically decaying lower Ricci curvature bounds and minimal volume growth. We first prove a rigidity result showing that ends with strongly minimal volume growth are isometric to warped product manifolds. Next we consider the almost rigid case in which manifolds with nonnegative and quadratically decaying lower Ricci curvature bounds have minimal volume growth. Compact regions in such manifolds are shown to be asymptotically close to warped products in the Gromov-Hausdorff topology. Manifolds with nonnegative Ricci curvature and linear volume growth are shown to have regions which are asymptotically close to being isometric products. The proofs involve a careful analysis of the Busemann functions on these manifolds using the recently developed Cheeger-Colding Almost Rigidity Theory. In addition, we show that the diameters of the level sets of Busemann functions in such manifolds grow sublinearly.

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