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arXiv 2108.00558math.AP
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周期介质中Allen-Cahn流和曲率流表面张力梯度间断和零迁移率的出现

The occurrence of surface tension gradient discontinuities and zero mobility for Allen-Cahn and curvature flows in periodic media

William M Feldman, Peter S Morfe

摘要:

我们构建了几个例子相关的非均匀介质中的能量极小化和表面能泛函的梯度流的标度限制。这些包括尖锐和漫射界面模型。重点是两个独立的,但相关的问题,有效的表面张力的规律性和零流动性的发生在相关的梯度流。规则性,我们建立在高盛,Chambolle和Novaga的理论表明,梯度不连续的表面张力是通用的尖锐的接口模型。在扩散界面的情况下,我们只表明,由平面状的解决方案,满足强伯克霍夫性质一般不是叶理,并有差距。在流动性,我们构建的例子中的尖锐和弥漫的界面的情况下,均匀化缩放限制的$L^2$梯度流是微不足道的,即有钉扎在每个方向。在锐界面情况下,这些与Novaga和Valdinoci以前为强迫中曲率流构造的例子有关。

英文摘要:

We construct several examples related to the scaling limits of energy minimizers and gradient flows of surface energy functionals in heterogeneous media. These include both sharp and diffuse interface models. The focus is on two separate but related issues, the regularity of effective surface tensions and the occurrence of zero mobility in the associated gradient flows. On regularity we build on the theory of Goldman, Chambolle and Novaga to show that gradient discontinuities in the surface tension are generic for sharp interface models. In the diffuse interface case we only show that the laminations by plane-like solutions satisfying the strong Birkhoff property generically are not foliations and do have gaps. On mobility we construct examples in both the sharp and diffuse interface case where the homogenization scaling limit of the $L^2$ gradient flow is trivial, i.e. there is pinning at every direction. In the sharp interface case, these are related to examples previously constructed by Novaga and Valdinoci for forced mean curvature flow.

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