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arXiv 1803.04076math.AP
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空间维为$d \geq 4$的临界Besov空间中斯托克斯方程的爆破准则

Blowup criterion for Navier-Stokes equation in critical Besov space with spatial dimensions $d \geq 4$

Kuijie Li, Baoxiang Wang

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摘要：

本文研究了高维空间中不可压Navier-斯托克斯方程温和解的爆破准则$d \geq 4$。通过建立一个$ε$正则性准则，我们证明了：如果初始数据为$\dot B^{-1+d/p}_{p,q}(\mathbb{R}^d) $的温和解$u$，$d<p,\,q<\infty$在有限时刻$T_*$处奇异，则$$ \limsup_{t\to T_*} \|u(t)\|_{\dot B^{-1+d/p}_{p,q}(\mathbb{R}^d)} = \infty. $$在三维情况下的相应结果已由I.Gallagher，G. S. KochandF. Planchon得到.作为副产品，我们还证明了临界Besov空间中Leray-Hopf解的正则性准则，推广了~ \cite{DoDu09}中的结果，其中得到了临界Lebesgue空间$L^d(\mathbb{R}^d)$中的爆破准则。

英文摘要：

This paper is concerned with the blowup criterion for mild solution to the incompressible Navier-Stokes equation in higher spatial dimensions $d \geq 4$. By establishing an $ε$ regularity criterion, we show that if the mild solution $u$ with initial data in $\dot B^{-1+d/p}_{p,q}(\mathbb{R}^d) $, $d<p,\,q<\infty$ becomes singular at a finite time $T_*$, then $$ \limsup_{t\to T_*} \|u(t)\|_{\dot B^{-1+d/p}_{p,q}(\mathbb{R}^d)} = \infty. $$ The corresponding result in 3D case has been obtained by I.Gallagher, G.S.KochandF.Planchon. As a by-product, we also prove a regularity criterion for the Leray-Hopf solution in the critical Besov space, which generalizes the results in~\cite{DoDu09}, where blowup criterion in critical Lebesgue space $L^d(\mathbb{R}^d)$ is obtained.

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