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arXiv 2103.02656math.AP
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单阶段Muskat问题的全局适定性

Global well-posedness for the one-phase Muskat problem

Hongjie Dong, Francisco Gancedo, Huy Q. Nguyen

摘要:

研究了多孔介质中二维渗流的自由边界问题。这被称为单相马斯卡特问题,在数学上等价于由重力驱动的垂直Hele-Shaw问题。证明了当初始自由边界是周期Lipschitz函数的图时,存在强$L^\infty_t L^2_x$意义下的整体Lipschitz解,并且是唯一的黏性解.证明需要对Lipschitz域中的层势和逐点椭圆正则性进行定量估计。这是第一次构造唯一的整体强解的Muskat问题的初始数据的任意大小。

英文摘要:

The free boundary problem for a two-dimensional fluid filtered in porous media is studied. This is known as the one-phase Muskat problem and is mathematically equivalent to the vertical Hele-Shaw problem driven by gravity force. We prove that if the initial free boundary is the graph of a periodic Lipschitz function, then there exists a global-in-time Lipschitz solution in the strong $L^\infty_t L^2_x$ sense and it is the unique viscosity solution. The proof requires quantitative estimates for layer potentials and pointwise elliptic regularity in Lipschitz domains. This is the first construction of unique global strong solutions for the Muskat problem with initial data of arbitrary size.

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