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arXiv 2008.09868math.AP
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强迫面准地转方程:定常态和锐松弛率的存在性

On the forced surface quasi-geostrophic equation: Existence of steady states and sharp relaxation rates

Fazel Hadadifard, Atanas G. Stefanov

摘要:

本文研究了表面准地转方程在小外力作用下的渐近性态。在适当的假设下,强迫,我们首先构建的稳定状态,我们提供了一些有用的后验估计。重要的是,要做到这一点,我们只对强制函数施加最小取消条件。我们的主要结果是,所有的$L^1\cap L^\infty$本地化的初始数据产生的整体解决方案的强制SQG,收敛到稳态$L^p(\mathbf R^2), 1<p\leq 2$随着时间的推移到无穷大。这确定了稳态作为一个点吸引集。此外,通过采用标度变量的方法,我们计算的急剧松弛率,通过需要稍微本地化的初始数据。

英文摘要:

We consider the asymptotic behavior of the surface quasi-geostrophic equation, subject to a small external force. Under suitable assumptions on the forcing, we first construct the steady states and we provide a number of useful a posteriori estimates for them. Importantly, to do so, we only impose minimal cancellation conditions on the forcing function. Our main result is that all $L^1\cap L^\infty$ localized initial data produces global solutions of the forced SQG, which converge to the steady states in $L^p(\mathbf R^2), 1<p\leq 2$ as time goes to infinity. This establishes that the steady states serve as one point attracting set. Moreover, by employing the method of scaling variables, we compute the sharp relaxation rates, by requiring slightly more localized initial data.

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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