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arXiv 1407.8199math.APmath-phmath.MP
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临界范数有界的径向半线性超临界wave equations的散射

Scattering for radial, semi-linear, super-critical wave equations with bounded critical norm

Benjamin Dodson, Andrew Lawrie

摘要:

本文研究了具有径向初值的1+5维聚焦三次波方程以及具有模型目标流形$\mathbb{S}^3$和$\mathbb{H}^3$的1+3维等变波映象方程。在这两种情况下,方程的标度使解的$\dot{H}^{\frac{3}{2}} \times \dot{H}^{\frac{1}{2}}$范数不变,这意味着方程相对于守恒能量是超临界的。在这里,我们证明了一个条件散射的结果:如果该解决方案的临界范数保持其存在的最大时间有界,那么该解决方案在时间上是全球性的,并在无限时间内向前和向后散射到自由波。本文的方法同样适用于1+5维的聚焦和散焦径向半线性方程的所有超临界幂型非线性问题,得到了类似的结果。

英文摘要:

In this paper we study the focusing cubic wave equation in 1+5 dimensions with radial initial data as well as the one-equivariant wave maps equation in 1+3 dimensions with the model target manifolds $\mathbb{S}^3$ and $\mathbb{H}^3$. In both cases the scaling for the equation leaves the $\dot{H}^{\frac{3}{2}} \times \dot{H}^{\frac{1}{2}}$-norm of the solution invariant, which means that the equation is super-critical with respect to the conserved energy. Here we prove a conditional scattering result: If the critical norm of the solution stays bounded on its maximal time of existence, then the solution is global in time and scatters to free waves both forwards and backwards in infinite time. The methods in this paper also apply to all supercritical power-type nonlinearities for both the focusing and defocusing radial semi-linear equation in 1+5 dimensions, yielding analogous results.

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