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arXiv 0904.2880math.AP
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wave equation的双线性$L^2$ Schahartz估计的逆定理

An inverse theorem for the bilinear $L^2$ Strichartz estimate for the wave equation

Terence Tao

摘要:

波方程的一个标准双线性$L^2$ Eschenhartz估计是布尔甘和克莱纳曼-马切登的$X^{s,b}$空间理论的基础,它(粗略地说)断言,如果波方程的两个有限能量解在频率空间的光锥的横向区域中得到支持,那么它们的乘积在时空$L^2$中有一个定量的边界。在本文中,我们考虑这个估计的\emph{inverse problem}:如果两个波的乘积有大的$L^2$范数,这告诉我们什么波本身?粗略地说,主要的结果是低频波从有限数量的光线中散射出去。这一结果将被用于即将出版的论文\cite{tao:heatwave4}的作者对全球正则性问题的波映射。

英文摘要:

A standard bilinear $L^2$ Strichartz estimate for the wave equation, which underlies the theory of $X^{s,b}$ spaces of Bourgain and Klainerman-Machedon, asserts (roughly speaking) that if two finite-energy solutions to the wave equation are supported in transverse regions of the light cone in frequency space, then their product lies in spacetime $L^2$ with a quantitative bound. In this paper we consider the \emph{inverse problem} for this estimate: if the product of two waves has large $L^2$ norm, what does this tell us about the waves themselves? The main result, roughly speaking, is that the lower-frequency wave is dispersed away from a bounded number of light rays. This result will be used in a forthcoming paper \cite{tao:heatwave4} of the author on the global regularity problem for wave maps.

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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