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arXiv 2004.07163math.DG
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高余维数平均曲率流与手术

High Codimension Mean Curvature Flow with Surgery

Stephen Lynch, Huy The Nguyen

AI总结:

本文提出了一种高余维数平均曲率流的手术方法,通过二次2-凸性条件实现对奇点的拓扑控制,并获得了子流形的精确分类。

摘要:

我们为任意余维数的子流形构造了一种带有手术的平均曲率流。该理论适用于满足自然二次压缩条件的闭合子流形,这在高余维数情况下是2-凸性的一种类比,并且在n≥8的情况下在流下得到保持。我们的结果因此与当前在余维数为一的情况下(目前需要2-凸性进行手术)的最先进技术状态一致。我们的分析核心是一组新的先验估计,用于第二基本形式,这些估计在手术过程中保持一致,从而提供了高曲率区域的精确描述,并允许受控的手术。这为在更高余维数中首次提供了通过奇点的平均曲率流的拓扑控制概念。作为结果,我们获得了精确的分类:每一个闭合的二次2-凸子流形要么同胚于Sⁿ,要么同胚于有限个S¹上的Sⁿ⁻¹丛的连通和。

英文摘要:

We construct a mean curvature flow with surgery for submanifolds of arbitrary codimension. The theory applies to closed submanifolds satisfying a natural quadratic pinching condition, which serves as the high-codimension analogue of 2-convexity and is preserved under the flow in dimensions $n \geq 8$. Our results therefore are in line with the current state-of-the-art in codimension one (where at present 2-convexity is required for surgery). Central to our analysis is a collection of new a priori estimates for the second fundamental form, uniform across surgeries, which yield a precise description of high-curvature regions and permit controlled surgeries. This provides the first notion of mean curvature flow through singularities with topological control in higher codimensions. As a consequence we obtain a sharp classification: Every closed quadratically 2-convexity submanifold is diffeomorphic either to $\mathbb{S}^n$ or to a finite connected sum of $\mathbb{S}^{n-1}$-bundles over $\mathbb{S}^1$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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