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arXiv 1503.06291math.AP
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Repubshenko系统的整体存在性和最小衰减正则性:非等波速情形

Global existence and minimal decay regularity for the Timoshenko system: The case of non-equal wave speeds

Jiang Xu, Naofumi Mori, Shuichi Kawashima

摘要:

作为文[18]的继续,我们研究了非等波速情形下的Reynshenko系统,它允许\textit{regularity-loss}的耗散结构.首先,通过对文献[18]中先验估计的修正,我们构造了Besov空间中具有正则性$s=3/2$数据的Besov系统的整体解。由于耗散机制较弱,通常需要比整体时间存在性更高的正则性才能得到经典解的最优衰减率,因此几乎不可能得到临界空间的最优衰减率.为了克服这个突出的困难,我们提出了一个新的频率局部化时间衰减不等式,它捕获了与高频部分的可积性相关的信息。此外,利用能量方法,通过高频和低频分解,得到了临界Besov空间中的最优衰减率,改进了前人的工作.

英文摘要:

As a continued work of [18], we are concerned with the Timoshenko system in the case of non-equal wave speeds, which admits the dissipative structure of \textit{regularity-loss}. Firstly, with the modification of a priori estimates in [18], we construct global solutions to the Timoshenko system pertaining to data in the Besov space with the regularity $s=3/2$. Owing to the weaker dissipative mechanism, extra higher regularity than that for the global-in-time existence is usually imposed to obtain the optimal decay rates of classical solutions, so it is almost impossible to obtain the optimal decay rates in the critical space. To overcome the outstanding difficulty, we develop a new frequency-localization time-decay inequality, which captures the information related to the integrability at the high-frequency part. Furthermore, by the energy approach in terms of high-frequency and low-frequency decomposition, we show the optimal decay rate for Timoshenko system in critical Besov spaces, which improves previous works greatly.

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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