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arXiv 1003.5978math.AP
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二维wave equation的双线性Fourier约束估计

Bilinear Fourier restriction estimates related to the 2d wave equation

Sigmund Selberg

摘要:

我们研究双线性$L^2$傅立叶限制估计,这是相关的二维波动方程的意义上,我们限制到子集的加厚零锥。在以前的论文中,我们研究了相应的3D问题,获得了几个改进的Klainerman-Machedon型估计。后者是三维波动方程的Escherichartz的$L^4$估计的双线性推广。在二维中,波动方程的解没有$L^4$估计,但是正如我们在这里所示,人们仍然可以获得加厚零锥的$L^2$双线性估计,这可以被视为三维Klainerman-Machedon型估计的类似物。然后,我们证明了这些估计的一些改进,类似于我们之前在3d中获得的。我们想到的主要应用是麦克斯韦-狄拉克系统。

英文摘要:

We study bilinear $L^2$ Fourier restriction estimates which are related to the 2d wave equation in the sense that we restrict to subsets of thickened null cones. In an earlier paper we studied the corresponding 3d problem, obtaining several refinements of the Klainerman-Machedon type estimates. The latter are bilinear generalizations of the $L^4$ estimate of Strichartz for the 3d wave equation. In 2d there is no $L^4$ estimate for solutions of the wave equation, but as we show here, one can nevertheless obtain $L^2$ bilinear estimates for thickened null cones, which can be viewed as analogues of the 3d Klainerman-Machedon type estimates. We then prove a number of refinements of these estimates, analogous to those we obtained earlier in 3d. The main application we have in mind is the Maxwell-Dirac system.

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