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arXiv 1001.4037math.APmath.CV
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三次Szego方程在实直线上的行波解

Traveling waves for the cubic Szego equation on the real line

Oana Pocovnicu

摘要:

考虑三次Szego方程i u_t=Pi(|u| ^2 u)在实直线上的解,其解在上半平面的Hardy空间中,其中Pi是Szego在非负频率上的投影.该方程是最近由P. Gerard和S. Grelier作为完全非色散发展方程的玩具模型。我们证明了行波是具有一个单极点的有理函数。此外,它们被证明是轨道稳定的,与上述作者研究的圆S^1的情况相反,其中一些行波被证明是不稳定的。

英文摘要:

We consider the cubic Szego equation i u_t=Pi(|u|^2u) on the real line, with solutions in the Hardy space on the upper half-plane, where Pi is the Szego projector onto the non-negative frequencies. This equation was recently introduced by P. Gerard and S. Grellier as a toy model for totally non-dispersive evolution equations. We show that the only traveling waves are rational functions with one simple pole. Moreover, they are shown to be orbitally stable, in contrast to the situation of the circle S^1 studied by the above authors, where some traveling waves were shown to be unstable.

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