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arXiv 2101.03354math.AP
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光滑集的非局部扩散

Nonlocal diffusion of smooth sets

Anoumou Attiogbe, El Hadji Abdoulaye Thiam, Mouhamed Moustapha Fall

摘要:

我们考虑光滑集的法向速度由$s-$分数扩散演化。我们证明了对于小时间,对于$s\in [\frac{1}{2}, 1)$,这类集合的法向速度几乎正比于初始集合边界的平均曲率,而对于$s\in (0, \frac{1}{2})$,这类集合的法向速度几乎正比于初始集合的分数中曲率.我们的结果表明,(分数)中曲率流的运动可以近似的分数热扩散和扩散的调和扩张的光滑集。

英文摘要:

We consider normal velocity of smooth sets evolving by the $s-$fractional diffusion. We prove that for small time, the normal velocity of such sets is nearly proportional to the mean curvature of the boundary of the initial set for $s\in [\frac{1}{2}, 1)$ while, for $s\in (0, \frac{1}{2})$, it is nearly proportional to the fractional mean curvature of the initial set. Our results show that the motion by (fractional) mean curvature flow can be approximated by fractional heat diffusion and by a diffusion by means of harmonic extension of smooth sets.

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