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arXiv 2004.13129math.AP
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凸超曲面上的分数阶Michael-Simon Sobolev不等式

A fractional Michael-Simon Sobolev inequality on convex hypersurfaces

Xavier Cabre, Matteo Cozzi, Gyula Csató

摘要:

经典的Michael-Simon和Allard不等式是定义在欧几里得空间子流形上的函数的Sobolev不等式。它由一个独立于流形的普适常数控制,但在右侧显示了一个由基础流形的中曲率加权的附加$L^p$项。我们在这里证明了这个不等式的一个分数版本的超曲面的欧几里得空间是凸集的边界。它涉及函数的Gagliardo半范数,以及由超曲面的分数中曲率加权的$L^p$范数。作为应用,我们建立了凸集的光滑分数中曲率流的最大存在时间的一个新的上界。边界取决于初始集合的周长而不是其直径。

英文摘要:

The classical Michael-Simon and Allard inequality is a Sobolev inequality for functions defined on a submanifold of Euclidean space. It is governed by a universal constant independent of the manifold, but displays on the right-hand side an additional $L^p$ term weighted by the mean curvature of the underlying manifold. We prove here a fractional version of this inequality on hypersurfaces of Euclidean space that are boundaries of convex sets. It involves the Gagliardo semi-norm of the function, as well as its $L^p$ norm weighted by the fractional mean curvature of the hypersurface. As an application, we establish a new upper bound for the maximal time of existence in the smooth fractional mean curvature flow of a convex set. The bound depends on the perimeter of the initial set instead of on its diameter.

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