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arXiv 1104.2571math.AP
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退化色散方程的不适定性

Ill-posedness of degenerate dispersive equations

David M. Ambrose, Gideon Simpson, J. Douglas Wright, Dennis G. Yang

摘要:

在这篇文章中,我们提供了数值和分析的证据,一些退化色散偏微分方程是不适定的。具体研究了K(2,2)方程$u_t = (u^2)_{xxx} + (u^2)_{x}$和“退化Airy”方程$u_t = 2 u u_{xxx}$ .对于K(2,2),我们的结果是计算的性质:我们进行了一系列的数值模拟表明,数据是非常小的$H^2$可以在一个固定的时间,这是独立的数据的大小的单位大小。对于退化的Airy方程,我们的结果是完全严格的:我们证明了存在一个紧支撑的自相似的解决方案,当结合一定的标度不变性,意味着不适定性(也在$H^2$)。

英文摘要:

In this article we provide numerical and analytical evidence that some degenerate dispersive partial differential equations are ill-posed. Specifically we study the K(2,2) equation $u_t = (u^2)_{xxx} + (u^2)_{x}$ and the "degenerate Airy" equation $u_t = 2 u u_{xxx}$. For K(2,2) our results are computational in nature: we conduct a series of numerical simulations which demonstrate that data which is very small in $H^2$ can be of unit size at a fixed time which is independent of the data's size. For the degenerate Airy equation, our results are fully rigorous: we prove the existence of a compactly supported self-similar solution which, when combined with certain scaling invariances, implies ill-posedness (also in $H^2$).

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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