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arXiv 2102.13041math.AP
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超临界分数流到中曲率流的收敛

Convergence of supercritical fractional flows to the mean curvature flow

Lucia De Luca, Andrea Kubin, Marcello Ponsiglione

摘要:

我们考虑一个核心半径的方法来管理的各向同性内核临界和超临界指数的非局部周长,扩展了当今经典的概念$s$ -分数周长,定义为$0<s<1$,的情况下$s\ge 1$ \,。我们发现,作为核心半径消失,这样的核心半径正则化$s$ -分数周长,适当缩放,$Γ$ -收敛到标准的欧几里得周长。在相同的尺度下,这种非局部周长的一阶变分给回正规$s$ -分数曲率,作为核心半径消失,收敛到标准的中曲率,因此,我们表明,水平集的解决方案,相应的非局部几何流,适当地重新参数化的时间,收敛到标准的中曲率流。最后,我们证明了类似的结果的情况下,各向异性内核与应用位错动力学。保留字:分数周长; $Γ$ -收敛;局部和非局部几何演化;黏性解;水平集公式;分数中曲率流;位错动力学

英文摘要:

We consider a core-radius approach to nonlocal perimeters governed by isotropic kernels having critical and supercritical exponents, extending the nowadays classical notion of $s$-fractional perimeter, defined for $0<s<1$, to the case $s\ge 1$\,. We show that, as the core-radius vanishes, such core-radius regularized $s$-fractional perimeters, suitably scaled, $Γ$-converge to the standard Euclidean perimeter. Under the same scaling, the first variation of such nonlocal perimeters gives back regularized $s$-fractional curvatures which, as the core radius vanishes, converge to the standard mean curvature; as a consequence, we show that the level set solutions to the corresponding nonlocal geometric flows, suitably reparametrized in time, converge to the standard mean curvature flow. Finally, we prove analogous results in the case of anisotropic kernels with applications to dislocation dynamics. Keywords: Fractional perimeters; $Γ$-convergence; Local and nonlocal geometric evolutions; Viscosity solutions; Level set formulation; Fractional mean curvature flow; Dislocation dynamics

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