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

详细信息    查看全文

• 作者：Jiang Xu^a ; ^{jiangxu_79@nuaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Naofumi Mori^b ; ^{n-mori@math.kyushu-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Shuichi Kawashima^c ; ^{kawashim@math.kyushu-u.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：35L45 ; 35B40 ; 74F05
• 刊名：Journal of Differential Equations
• 出版年：2015
• 出版时间：5 December 2015
• 年：2015
• 卷：259
• 期：11
• 页码：5533-5553
• 全文大小：349 K

文摘

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 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$s=3/2$. 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.