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arXiv 1901.02863math.DGmath.AP
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流向倒圆点的非凸曲面

Nonconvex Surfaces which Flow to Round Points

Alexander Mramor, Alec Payne

摘要:

本文推广了Huisken定理,即凸曲面通过中曲率流流向圆点。我们构造了某些类的平均凸和非平均凸超曲面,收缩到圆形点,并使用这些结构来创建流的病理学例子。我们发现一个序列的流量存在于一个统一的时间间隔,有统一的有界直径,并缩小到圆形点,但序列的初始表面没有子序列收敛在Gromov-Hausdorff意义上。此外,我们发现了一个序列的流,所有收缩到圆形点,但初始表面收敛到一个空间填充表面。还构造了任意大面积的曲面,这些曲面在Hausdorff距离上接近圆形球体,但收缩为圆形点。

英文摘要:

In this article, we extend Huisken's theorem that convex surfaces flow to round points by mean curvature flow. We construct certain classes of mean convex and non-mean convex hypersurfaces that shrink to round points and use these constructions to create pathological examples of flows. We find a sequence of flows that exist on a uniform time interval, have uniformly bounded diameter, and shrink to round points, yet the sequence of initial surfaces has no subsequence converging in the Gromov-Hausdorff sense. Moreover, we find a sequence of flows which all shrink to round points, yet the initial surfaces converge to a space-filling surface. Also constructed are surfaces of arbitrarily large area which are close in Hausdorff distance to the round sphere yet shrink to round points.

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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