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arXiv 0812.1573math.AP
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常接触角图在自由边界上的中曲率运动

Mean Curvature Motion of Graphs with Constant Contact Angle at a Free Boundary

Alexandre Freire

摘要:

我们考虑运动的中曲率的$n$维图的时间依赖域在$\mathbb{R}^n$,相交$\mathbb{R}^n$在一个恒定的角度。在一般情况下,我们证明了相应的具有自由边界的拟线性抛物型方程解的局部存在性,并基于第二基本型得到了一个连续性准则.如果初始图是凹的,我们证明这是保持的,并且该解决方案只存在于有限的时间。这对应于一个对称的版本的中曲率运动的网络超曲面与三重结,与恒定的接触角的交界处。

英文摘要:

We consider the motion by mean curvature of an $n$-dimensional graph over a time-dependent domain in $\mathbb{R}^n$, intersecting $\mathbb{R}^n$ at a constant angle. In the general case, we prove local existence for the corresponding quasilinear parabolic equation with a free boundary, and derive a continuation criterion based on the second fundamental form. If the initial graph is concave, we show this is preserved, and that the solution exists only for finite time. This corresponds to a symmetric version of mean curvature motion of a network of hypersurfaces with triple junctions, with constant contact angle at the junctions.

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