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arXiv 2602.03575math.AP
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具有阻尼的可压缩欧拉系统在混合贝索夫空间中的全局适定性及松弛极限

The compressible Euler system with damping in hybrid Besov spaces: global well-posedness and relaxation limit

Timothée Crin-Barat, Zihao Song

AI总结:

本文研究了具有阻尼的可压缩欧拉系统在混合贝索夫空间中的全局适定性及向孔隙流体方程的松弛极限,通过精细的乘积和交换子估计和频率阈值选择,提供了更统一的分析框架。

摘要:

我们研究了在R^d(d≥1)中具有阻尼的可压缩欧拉系统在全球适定性及向孔隙流体方程的松弛极限。在[12]中,第一作者与Danchin在混合贝索夫空间中研究了这两个问题,其中解的高频部分在基于L2的范数下有界,而低频部分在基于Lp的范数下受控,其中p∈[2,max{4,2d/(d-2)}]。受观察到极限系统在p∈[2,∞)的Lp空间中适定的启发,我们将低频分析扩展到此完整范围,从而为研究此类松弛极限提供了更统一的框架。我们的证明核心在于建立描述高频、中频和低频区域之间相互作用的精细乘积和交换子估计。分析中的关键观察是两个局部于低频的函数的乘积仅产生低频和中频之间的相互作用,绝不会纯粹是高频的。因此,对于合适的频率阈值,两个局部于低频的函数的乘积的高频投影消失。

英文摘要:

We investigate the global well-posedness of the compressible Euler system with damping in Rd (d\geq1) and its relaxation limit toward the porous medium equation. In [12], the first author and Danchin studied these two problems in hybrid Besov spaces, where the high-frequency components of the solution are bounded in L2-based norms, while the low-frequency components are controlled in Lp-based norms with p\in[2,\max{4,\frac{2d}{d-2}}]. Motivated by the observation that the limit system is well-posed in Lp-based spaces for p\in[2, \infty), we extend the low-frequency analysis to this full range, thereby providing a more unified framework for studying such relaxation limits. The core of our proof consists in establishing refined product and commutator estimates describing sharply the interactions between the high, medium, and low-frequency regimes. A key observation underlying our analysis is that the product of two functions localized at low frequencies generates only interactions between low and medium frequencies, never purely high-frequency ones. Consequently, for a suitable choice of frequency threshold, the high-frequency projection of the product of two functions localized low frequencies vanishes.

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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