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arXiv 1809.01745math.AP
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共旋波映射的阈值动力学

Threshold dynamics for corotational wave maps

Casey Rodriguez

摘要:

我们研究了在阈能下从$\mathbb R^{1+2} \rightarrow \mathbb S^2$得到的共旋波图的动力学性质。已知具有能量$< 8π$的拓扑平凡波映射是全局的并且分散到常数映射。本文证明了能量等于$8π$的共旋波映射是全局定义的,并且在一个时间方向上是散射的,而在另一个时间方向上,要么是全局定义的,并且是散射的,要么是在有限时间内分解的,并且收敛于两个调和映射的叠加.后一种行为与具有阈值能量的更高等变波图形成鲜明对比,阈值能量已被证明是全球定义的。利用本文发展的技术,我们还构造了一个能量为$= 8π$的共旋波映射,它在有限时间内爆炸。我们构造的爆破解决方案提供了第一个例子,一个最小的拓扑平凡的非分散解决方案的全波地图的演变。

英文摘要:

We study the dynamics of corotational wave maps from $\mathbb R^{1+2} \rightarrow \mathbb S^2$ at threshold energy. It is known that topologically trivial wave maps with energy $< 8π$ are global and scatter to a constant map. In this work, we prove that a corotational wave map with energy equal to $8π$ is globally defined and scatters in one time direction, and in the other time direction, either the map is globally defined and scatters, or the map breaks down in finite time and converges to a superposition of two harmonic maps. The latter behavior stands in stark contrast to higher equivariant wave maps with threshold energy which have been proven to be globally defined for all time. Using techniques developed in this paper, we also construct a corotational wave map with energy $= 8π$ which blows up in finite time. The blow-up solution we construct provides the first example of a minimal topologically trivial non-dispersing solution to the full wave map evolution.

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