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arXiv math/0112013math.AP
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正则空间的一个新标度及其在Euler方程中的应用

On a new scale of regularity spaces with applications to Euler's equations

Eitan Tadmor

摘要:

我们引入了一个新的梯形函数空间,它填补了弱$L^{p\infty}$空间和较大的Morrey空间,$M^p$之间的差距。我们引入这些新空间的动机,记为$\V^{pq}$,是为了获得一个更准确的信息(紧)嵌入适当的索伯列夫空间的Morrey空间。正是在这里,第二参数q(--和另一个对数细化参数$α$,表示为$\V^{pq}(\log \V)^α$)给出了更精细的缩放,这允许我们进行嵌入具有固定阶光滑度的空间所需的细微区分。本文利用最近在{Lopes Filho M C,Nussenzveig Lopes H J and Tadmor E 2001近似解中引入的$H^{-1}$ -稳定性准则,研究了近似解的强收敛性.我们展示了如何新的细化规模的空间,$\V^{pq}(\log \V)^α$,使我们接近的边界情况下,分离之间的$H^{-1}$ -紧性和现象的浓度取消。表示在他们的$\V^{pq}(\log \V)^α$边界方面,这些边界线的情况下被证明是密切相关的总(库仑)能量和相关的涡度配置的统一边界。

英文摘要:

We introduce a new ladder of function spaces which is shown to fill in the gap between the weak $L^{p\infty}$ spaces and the larger Morrey spaces, $M^p$. Our motivation for introducing these new spaces, denoted $\V^{pq}$, is to gain a more accurate information on (compact) embeddings of Morrey spaces in appropriate Sobolev spaces. It is here that the secondary parameter q (-- and a further logarithmic refinement parameter $α$, denoted $\V^{pq}(\log \V)^α$) gives a finer scaling, which allows us to make the subtle distinctions necessary for embedding in spaces with a fixed order of smoothness. We utilize an $H^{-1}$-stability criterion which we have recently introduced in {Lopes Filho M C, Nussenzveig Lopes H J and Tadmor E 2001 Approximate solution of the incompressible Euler equations with no concentrations Ann. Institut H Poincare C 17 371-412}, in order to study the strong convergence of approximate Euler solutions. We show how the new refined scale of spaces, $\V^{pq}(\log \V)^α$, enables us approach the borderline cases which separate between $H^{-1}$-compactness and the phenomena of concentration-cancelation. Expressed in terms of their $\V^{pq}(\log \V)^α$ bounds, these borderline cases are shown to be intimately related to uniform bounds of the total (Coulomb) energy and the related vorticity configuration.

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