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arXiv 0811.3928math.AP
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程函方程的无向解

Non-oriented solutions of the eikonal equation

Mark A. Peletier, Marco Veneroni

摘要:

研究程函方程的一种新形式|gradu|在R^2的有界子集上,代替向量场grad u,我们考虑一维子空间上正交投影的场P,其中div P在L^2中。证明了方程P div P=0解的存在唯一性.我们给出了一个几何描述,与经典的情况下,我们证明,这样的解决方案存在,只有当域是一个经常闭曲线的管状邻域。证明的思想是应用Jabin,Otto,Perthame,“Line-energy Ginzburg-Landau models:zero-energy states”,Ann. Sc. Norm中介绍的特征线的一般化方法。Super.比萨海峡Sci. (5)1(2002),到满足P = m \otimes m的适当向量场m。该公式为分析条纹图案提供了一种有用的方法。它特别适用于图案的物理性质在180度旋转下不变的系统,例如嵌段共聚物或液晶系统。

英文摘要:

We study a new formulation for the eikonal equation |grad u| =1 on a bounded subset of R^2. Instead of a vector field grad u, we consider a field P of orthogonal projections on 1-dimensional subspaces, with div P in L^2. We prove existence and uniqueness for solutions of the equation P div P=0. We give a geometric description, comparable with the classical case, and we prove that such solutions exist only if the domain is a tubular neighbourhood of a regular closed curve. The idea of the proof is to apply a generalized method of characteristics introduced in Jabin, Otto, Perthame, "Line-energy Ginzburg-Landau models: zero-energy states", Ann. Sc. Norm. Super. Pisa Cl. Sci. (5) 1 (2002), to a suitable vector field m satisfying P = m \otimes m. This formulation provides a useful approach to the analysis of stripe patterns. It is specifically suited to systems where the physical properties of the pattern are invariant under rotation over 180 degrees, such as systems of block copolymers or liquid crystals.

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