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arXiv 2203.13593nlin.SImath-phmath.MP
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Peakon模型中的可积二次结构

Integrable quadratic structures in peakon models

J. Avan, L. Frappat, E. Ragoucy

摘要:

我们提出了三个可积的$n$体峰子方程Camassa-Holm,Degasperis-Procesi和Novikov的Lax表示的Poisson结构的实现.从连续方程的可积性结构导出的泊松结构产生$r$ -矩阵表示的二次形式,户田分子经典的$r$ -矩阵起着突出的作用。我们寻找$r$ -矩阵表示的线性形式。除了结构已知的Camassa-Holm案例外,其他两个案例不允许这样的介绍,$n=2$的Novikov模型是一个明显的例外。在这三种情况下,从二次结构的规范Sklyanin迹公式得到的广义哈密顿量。

英文摘要:

We propose realizations of the Poisson structures for the Lax representations of three integrable $n$-body peakon equations, Camassa--Holm, Degasperis--Procesi and Novikov. The Poisson structures derived from the integrability structures of the continuous equations yield quadratic forms for the $r$-matrix representation, with the Toda molecule classical $r$-matrix playing a prominent role. We look for a linear form for the $r$-matrix representation. Aside from the Camassa--Holm case, where the structure is already known, the two other cases do not allow such a presentation, with the noticeable exception of the Novikov model at $n=2$. Generalized Hamiltonians obtained from the canonical Sklyanin trace formula for quadratic structures are derived in the three cases.

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