arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1204.2140nlin.SI
收藏

Degasperis-Procesi族的代数几何解

The algebro-geometric solutions for Degasperis-Procesi hierarchy

Yu Hou, Peng Zhao, Engui Fan, Zhijun Qiao

摘要:

完全可积的Camassa-Holm(CH)方程和Degasperis-Procesi(DP)方程虽然属于同一个峰子族,但它们分别具有二阶和三阶Lax算子.从代数几何研究的角度来看,这种差异在于超椭圆曲线和非超椭圆曲线。非超椭圆曲线给DP方程的代数几何解的构造带来了很大的困难。在本文中,我们借助Lenard递归运算符推导出DP谱系。基于DP族Lax矩阵的特征多项式,引入亏格为$r-2$的三阶代数曲线$\mathcal{K}_{r-2}$,由此建立相应的Baker-Akhiezer函数、亚纯函数和Dubrovin型方程.此外,代数曲线的理论被应用到推导的Baker-Akhiezer函数和亚纯函数的theta函数的显式表示。特别地,得到了整个DP族中所有方程的代数几何解。

英文摘要:

Though completely integrable Camassa-Holm (CH) equation and Degasperis-Procesi (DP) equation are cast in the same peakon family, they possess the second- and third-order Lax operators, respectively. From the viewpoint of algebro-geometrical study, this difference lies in hyper-elliptic and non-hyper-elliptic curves. The non-hyper-elliptic curves lead to great difficulty in the construction of algebro-geometric solutions of the DP equation. In this paper, we derive the DP hierarchy with the help of Lenard recursion operators. Based on the characteristic polynomial of a Lax matrix for the DP hierarchy, we introduce a third order algebraic curve $\mathcal{K}_{r-2}$ with genus $r-2$, from which the associated Baker-Akhiezer functions, meromorphic function and Dubrovin-type equations are established. Furthermore, the theory of algebraic curve is applied to derive explicit representations of the theta function for the Baker-Akhiezer functions and the meromorphic function. In particular, the algebro-geometric solutions are obtained for all equations in the whole DP hierarchy.

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。

↑