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arXiv math/0610801math.AP
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能量临界聚焦非线性wave equation方程的整体适定性、散射和爆破

Global well-posedness, scattering and blow-up for the energy critical focusing non-linear wave equation

Carlos E. Kenig, Frank Merle

摘要:

我们证明,对于能量临界,聚焦NLW,对于Cauchy数据,(u_0,u_1)的能量小于(W,0)的能量,其中W是相应椭圆型方程的著名径向正解,下面的二分法成立:a)如果u_0的齐次Sobolev范数H^1小于W的齐次Sobolev范数,则我们具有全局适定性和散射性,b)如果u_0的齐次Sobolev范数H^1大于W的齐次Sobolev范数,则在有限时间内存在爆破。我们的一般方法是我们在我们以前的工作中介绍的NLS(数学AP/0610266,Inventiones Math 2006,Online First)的相应问题,其中我们证明了径向情况下NLS的相应结果。在波动方程的情况下,我们能够通过使用能量空间中的进一步守恒律、有限传播速度和洛伦兹变换来处理一般数据,以建立“能量临界“元素的关键正交性。为了证明有限时间爆破情形下的必要刚性定理,我们不能像NLS情形那样使用L^2范数的不变性。相反,(根据Merle-Zaag和Giga-Kohn在抛物情况下的早期工作)我们引入自相似变量。因此,我们找到了一个进一步的李雅普诺夫函数,使我们能够减少问题的退化椭圆问题的临界非线性。我们利用唯一延拓来排除退化椭圆问题非零解的存在性,从而完成了证明。

英文摘要:

We prove, for the energy critcal, focusing NLW, that for Cauchy data (u_0, u_1) whose energy is smaller than that of (W,0), where W is the well-known radial positive solution to the corresponding ellipyic equation, the following dichotomy holds: a) if the homogeneous Sobolev norm H^1 of u_0 is smaller than that of W, we have global well-posedness and scattering, b) if the homogeneous Sobolev norm H^1 of u_0 is larger than that of W, there is blow-up in finite time. Our general approach is the one we introduced in our previous work on the corresponding problem for NLS (math.AP/0610266, Inventiones Math 2006, Online First), where we proved the corresponding result for NLS in the radial case. In the case of the wave equation we are able to treat general data by using a further conservation law in the energy space, the finite speed of propagation and Lorentz transformations to establish a crucial orthogonality property for " energy critical " elements. To prove the required rigidity theorem in the case of blow-up in finite time, we cannot use the invariance of the L^2 norm as in the case of NLS. Instead, (following earlier work of Merle-Zaag and of Giga-Kohn in the parabolic case) we introduce self-similar variables. We thus find a further Liapunov function which allows us to reduce matters to a degenerate elliptic problem with critical non-linearity. We use unique continuation to rule out the existence of non-zero solutions for the degenerate elliptic problem, thus completing the proof.

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