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arXiv 1002.0326math.AP
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受迫中曲率运动螺线的唯一性和存在性

Uniqueness and existence of spirals moving by forced mean curvature motion

Nicolas Forcadel, Cyril Imbert, Régis Monneau

摘要:

本文研究二维平面内螺旋线的中曲率型运动。我们的动机来自位错动力学;在这种情况下,当螺旋位错线到达晶体表面时,就会出现螺旋。本文的第一个主要结果是相应抛物型拟线性方程的比较原理。就螺旋线的运动而言,我们的设置和结果的新颖性和独创性来自于这样一个事实:第一,由螺旋线的附着端点产生的奇异性首次被考虑在内,第二,螺旋线在整个空间中被研究。我们的第二个主要结果表明,柯西问题是适定性的类次线性弱(粘性)的解决方案。我们还解释了如何得到光滑解的存在性时,初始数据满足一个额外的兼容性条件。

英文摘要:

In this paper, we study the motion of spirals by mean curvature type motion in the (two dimensional) plane. Our motivation comes from dislocation dynamics; in this context, spirals appear when a screw dislocation line reaches the surface of a crystal. The first main result of this paper is a comparison principle for the corresponding parabolic quasi-linear equation. As far as motion of spirals are concerned, the novelty and originality of our setting and results come from the fact that, first, the singularity generated by the attached end point of spirals is taken into account for the first time, and second, spirals are studied in the whole space. Our second main result states that the Cauchy problem is well-posed in the class of sub-linear weak (viscosity) solutions. We also explain how to get the existence of smooth solutions when initial data satisfy an additional compatibility condition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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