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arXiv 1209.3682math.AP
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等变波映射问题I大能量解的特征

Characterization of large energy solutions of the equivariant wave map problem: I

Raphael Cote, Carlos Kenig, Andrew Lawrie, Wilhelm Schlag

摘要:

考虑从1+2维到2-球面的1-等变波映射.对于拓扑度为零的波映射,我们证明了能量小于由球极平面投影给出的调和映射Q的能量的两倍的波映射的整体存在性和散射性。我们通过第二作者和Merle发展的集中紧度/刚性方法推导出这个结果。特别是,我们建立了一个分类的等变波映射的轨迹是预紧的能量空间的标度对称的方程。事实上,这种类型的波图只能是0或Q,直到重新缩放。这给出了适用于零度理论的阈值猜想的改进版本的等变情况下的证明,其中真正的阈值是2 E(Q),而不是E(Q)。上述的整体存在性和散射陈述也可以通过考虑Sterbenz和Tataru在等变背景下的工作来推导。对于拓扑度为1的波映射,我们建立了能量小于3倍于Q能量的有限时间爆破解的分类。在这种能量限制下,我们证明了一次爆破解本质上是一个重标度的Q加上一个能量小于两倍于Q的拓扑度为零的余项的和.这一结果揭示了Krieger,第四作者,Tataru以及Raphael和Rodnianski的一阶1-等变波映射爆破构造的普适性质.

英文摘要:

We consider 1-equivariant wave maps from 1+2 dimensions to the 2-sphere. For wave maps of topological degree zero we prove global existence and scattering for energies below twice the energy of harmonic map, Q, given by stereographic projection. We deduce this result via the concentration compactness/rigidity method developed by the second author and Merle. In particular, we establish a classification of equivariant wave maps with trajectories that are pre-compact in the energy space up to the scaling symmetry of the equation. Indeed, a wave map of this type can only be either 0 or Q up to a rescaling. This gives a proof in the equivariant case of a refined version of the threshold conjecture adapted to the degree zero theory where the true threshold is 2E(Q), not E(Q). The aforementioned global existence and scattering statement can also be deduced by considering the work of Sterbenz and Tataru in the equivariant setting. For wave maps of topological degree one, we establish a classification of solutions blowing up in finite time with energies less than three times the energy of Q. Under this restriction on the energy, we show that a blow-up solution of degree one is essentially the sum of a rescaled Q plus a remainder term of topological degree zero of energy less than twice the energy of Q. This result reveals the universal character of the known blow-up constructions for degree one, 1-equivariant wave maps of Krieger, the fourth author, and Tataru as well as Raphael and Rodnianski.

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