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arXiv 0903.4134math.APmath.DG
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张量密度空间上的可积发展方程及其峰子解

Integrable evolution equations on spaces of tensor densities and their peakon solutions

Jonatan Lenells, Gerard Misiołek, Feride Tiğlay

摘要:

本文研究了定义在圆上权为$λ$的张量密度空间上的一类方程,并引入了两个可积偏微分方程。其中一个方程与无粘Burgers方程密切相关,而另一个方程以前没有以任何形式被确定。我们提出了他们的Lax对公式,并描述了他们的双哈密顿结构。我们证明了相应的柯西问题的局部适定性,包括爆破以及整体解的存在性。此外,我们构造了所有$λ\neq 0,1$的“峰”和“多峰”解,以及$λ= 3$的“冲击峰”解。我们认为,有一个自然的几何框架,这些方程,包括其他著名的可积方程,这是基于阿诺德的方法,李群上的欧拉方程。

英文摘要:

We study a family of equations defined on the space of tensor densities of weight $λ$ on the circle and introduce two integrable PDE. One of the equations turns out to be closely related to the inviscid Burgers equation while the other has not been identified in any form before. We present their Lax pair formulations and describe their bihamiltonian structures. We prove local wellposedness of the corresponding Cauchy problem and include results on blow-up as well as global existence of solutions. Moreover, we construct "peakon" and "multi-peakon" solutions for all $λ\neq 0,1$, and "shock-peakons" for $λ= 3$. We argue that there is a natural geometric framework for these equations that includes other well-known integrable equations and which is based on V. Arnold's approach to Euler equations on Lie groups.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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