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arXiv 2103.14535math.AP
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尺度不变Besov空间中Muskat问题的整体解($\dot B^1_{\infty, 1}$)

Global solutions for the Muskat problem in the scaling invariant Besov space $\dot B^1_{\infty, 1}$

Huy Q. Nguyen

摘要:

研究了具有任意粘度差的单相和两相Muskat问题。它们是关于图的自由边界的拟线性抛物型方程。证明了在尺度不变的齐次Besov空间$\dot B^1_{\infty, 1}$中,小数据点的解是唯一的.证明利用了一个新的结构的狄利克雷-诺依曼算子,使我们能够实现一个强大的不动点参数。作为该方法的结果,仅假设初始数据在$\dot B^1_{\infty, 1}$中,并且解映射在相同拓扑中是Lipschitz连续的。对于一般的Muskat问题,唯一已知的标度不变结果是在严格包含在$\dot B^1_{\infty, 1}$中的Wiener代数(加上$L^2$假设)中获得的。

英文摘要:

The one-phase and two-phase Muskat problems with arbitrary viscosity contrast are studied in all dimensions. They are quasilinear parabolic equations for the graph free boundary. We prove that small data in the scaling invariant homogeneous Besov space $\dot B^1_{\infty, 1}$ lead to unique global solutions. The proof exploits a new structure of the Dirichlet-Neumann operator which allows us to implement a robust fixed-point argument. As a consequence of this method, the initial data is only assumed to be in $\dot B^1_{\infty, 1}$ and the solution map is Lipschitz continuous in the same topology. For the general Muskat problem, the only known scaling invariant result was obtained in the Wiener algebra (plus an $L^2$ assumption) which is strictly contained in $\dot B^1_{\infty, 1}$.

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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