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arXiv 2008.05588math.APphysics.flu-dyn
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不可压缩流斜交方程极大函数的构造及应用

Construction of Maximal Functions associated with Skewed Cylinders Generated by Incompressible Flows and Applications

Jincheng Yang

摘要:

我们构造了一个极大函数与一个家庭的斜柱。这些圆柱体被定义为缓和流轨迹的管状邻域,出现在流体方程的研究中,例如Navier-斯托克斯方程和Euler方程。定义了从属于这些圆柱的极大函数,并通过一个覆盖引理证明了它是弱型$(1, 1)$和强型$(p, p)$.作为应用,我们给出了三维Navier-斯托克斯方程光滑解的高阶导数估计的另一种证明。

英文摘要:

We construct a maximal function associated with a family of skewed cylinders. These cylinders, which are defined as tubular neighborhoods of trajectories of a mollified flow, appear in the study of fluid equations such as the Navier-Stokes equations and the Euler equations. We define a maximal function subordinate to these cylinders, and show it is of weak type $(1, 1)$ and strong type $(p, p)$ by a covering lemma. As an application, we give an alternative proof for the higher derivatives estimate of smooth solutions to the three-dimensional Navier-Stokes equations.

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