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A remark on norm inflation for nonlinear wave equations
Dynamics of Partial Differential Equations ( IF 1.1 ) Pub Date : 2020-01-01 , DOI: 10.4310/dpde.2020.v17.n4.a3
Justin Forlano 1 , Mamoru Okamoto 2
Affiliation  

In this note, we study the ill-posedness of nonlinear wave equations (NLW). Namely, we show that NLW experiences norm inflation at every initial data in negative Sobolev spaces. This result covers a gap left open in a paper of Christ, Colliander, and Tao (2003) and extends the result by Oh, Tzvetkov, and the second author (2019) to non-cubic integer nonlinearities. In particular, for some low dimensional cases, we obtain norm inflation above the scaling critical regularity. We also prove ill-posedness for NLW, via norm inflation at general initial data, in negative regularity Fourier-Lebesgue and Fourier-amalgam spaces.

中文翻译:

关于非线性波动方程范数膨胀的评注

在本笔记中,我们研究非线性波动方程 (NLW) 的不适定性。也就是说,我们表明 NLW 在负 Sobolev 空间中的每个初始数据都经历了规范膨胀。该结果涵盖了 Christ、Colliander 和 Tao(2003 年)的论文中留下的空白,并将 Oh、Tzvetkov 和第二作者(2019 年)的结果扩展到非三次整数非线性。特别是,对于一些低维的情况,我们获得了高于标度临界规律的范数膨胀。我们还证明了 NLW 的不适定性,通过一般初始数据的范数膨胀,在负正则傅立叶-勒贝格和傅立叶-汞合金空间中。
更新日期:2020-01-01
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