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arXiv 1403.2913math.AP
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能量超临界非线性wave equations在\R^{3+1}上的大整体解

Large global solutions for energy supercritical nonlinear wave equations on \R^{3+1}

Joachim Krieger, Wilhelm Schlag

摘要:

对于径向能量超临界非线性波动方程$$\Box u = -u_{tt} + \triangle u = \pm u^7$$在$\R^{3+1}$上,证明了一类具有无穷大Sobolev临界范数的整体向前$\dot{H}^{\frac{7}{6}}(\R^3)\times \dot{H}^{\f16}(\R^3)$-光滑解的存在性.而且,这些解在适当的小扰动下是稳定的。我们还表明,对于{ \em散焦}能量超临界波动方程,我们可以构造这样的解决方案,而且满足尺寸条件$\|u(0, \cdot)\|_{L_x^\infty(|x|\geq 1)}>M$任意指定的$M>0$。这些解在适当的小扰动下是稳定的。我们的方法收益的正则化的自相似的解决方案是光滑的光锥,但奇异的光锥。这一论点主要取决于方程的超临界性质。我们的方法应被视为在\cite{KrSchTat1}、\cite{KrSchTat2}、\cite{DoKri}中启动的计划的一部分。

英文摘要:

For the radial energy-supercritical nonlinear wave equation $$\Box u = -u_{tt} + \triangle u = \pm u^7$$ on $\R^{3+1}$, we prove the existence of a class of global in forward time $C^\infty$-smooth solutions with infinite critical Sobolev norm $\dot{H}^{\frac{7}{6}}(\R^3)\times \dot{H}^{\f16}(\R^3)$. Moreover, these solutions are stable under suitably small perturbations . We also show that for the {\em defocussing} energy supercritical wave equation, we can construct such solutions which moreover satisfy the size condition $\|u(0, \cdot)\|_{L_x^\infty(|x|\geq 1)}>M$ for arbitrarily prescribed $M>0$. These solutions are stable under suitably small perturbations. Our method proceeds by regularization of self-similar solutions which are smooth away from the light-cone but singular on the light-cone. The argument crucially depends on the supercritical nature of the equation. Our approach should be seen as part of the program initiated in \cite{KrSchTat1}, \cite{KrSchTat2}, \cite{DoKri}.

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