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arXiv 2104.13041math.AP
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二维散焦半线性wave equation方程解的能量分布

Energy Distribution of solutions to defocusing semi-linear wave equation in two dimensional space

Liang Li, Ruipeng Shen, Lijuan Wei

摘要:

考虑二维空间中散焦非线性波动方程的有限能量解。我们证明了当时间趋于无穷大时,几乎所有的能量都以接近光速的速度向无穷大运动。此外,能量的向内/向外部分随着时间趋于正/负无穷大而逐渐消失。这些行为类似于自由波。我们还证明了一些衰减估计的解决方案,如果初始数据衰减在一定的速度作为空间变量趋于无穷大。作为应用,我们证明了初始数据在加权能量空间中的解的几个散射结果。我们的假设衰减率的初始数据是弱于以前已知的散射结果。

英文摘要:

We consider finite-energy solutions to the defocusing nonlinear wave equation in two dimensional space. We prove that almost all energy moves to the infinity at almost the light speed as time tends to infinity. In addition, the inward/outward part of energy gradually vanishes as time tends to positive/negative infinity. These behaviours resemble those of free waves. We also prove some decay estimates of the solutions if the initial data decay at a certain rate as the spatial variable tends to infinity. As an application, we prove a couple of scattering results for solutions whose initial data are in a weighted energy space. Our assumption on decay rate of initial data is weaker than previous known scattering results.

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