Nonlocal Symmetry of the Lax Equation Related to Riccati-Type Pseudopotential

Nonlocal Symmetry of the Lax Equation Related to Riccati-Type Pseudopotential
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Riccati型赝势相关的Lax方程的非局部对称性

DOI:
10.1088/0256-307x/29/12/120503
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发表时间:
2012-12
影响因子:
3.5
通讯作者:
Xin Xiangpeng
Xin Xiangpeng
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wang Yunhu;Chen Yong;Xin Xiangpeng

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我们研究了可用于描述重力作用下浅水长波运动的Lax方程。给出了该方程的一个非局部对称性,并利用它求出了精确解,并由高可积模型导出了低可积模型。有趣的是,这种非局域对称性与其相应的Riccati型赝势相联系。通过引入合适而简单的辅助因变量,将非局部对称性局部化,并利用非局部对称性从平凡解生成新的解。同时,利用这种非局部对称性和某些局部对称性,将该方程化为常微分方程组。
We investigate the Lax equation that can be employed to describe motions of long waves in shallow water under gravity. A nonlocal symmetry of this equation is given and used to find exact solutions and derive lower integrable models from higher ones. It is interesting that this nonlocal symmetry links with its corresponding Riccati-type pseudopotential. By introducing suitable and simple auxiliary dependent variables, the nonlocal symmetry is localized and used to generate new solutions from trivial solutions. Meanwhile, this equation is reduced to an ordinary differential equation by means of this nonlocal symmetry and some local symmetries.
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