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arXiv 1306.2984nlin.SImath-phmath.MP
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户田晶格G链

Toda lattice G-Strands

Darryl D. Holm, Alexander M. Lucas

摘要:

汉密尔顿原理被用来扩展户田格常微分方程的偏微分方程系统称为户田格链方程(T-链)。在$n$粒子Toda情况下的T链包括在一个空间和一个时间变量中的$4n-2$二次非线性PDE。T型股线形成具有恒定特征速度的二次非线性偏微分方程的对称双曲李-泊松哈密顿系统。用几何方法求解了两粒子T-Strand方程的行波解,并给出了它们的拉克斯对,以说明非线性对解的影响。三粒子T-链方程也是由Hamilton原理导出的。对于两粒子和三粒子T-链偏微分方程,存在二次零曲率关系(ZCR)的判定条件恰好抵消了偏微分方程中的非线性项。因此,两粒子和三粒子T链PDE未通过可积性的ZCR测试。

英文摘要:

Hamilton's principle is used to extend for the Toda lattice ODEs to systems of PDEs called the Toda lattice strand equations (T-Strands). The T-Strands in the $n$-particle Toda case comprise $4n-2$ quadratically nonlinear PDEs in one space and one time variable. T-Strands form a symmetric hyperbolic Lie-Poisson Hamiltonian system of quadratically nonlinear PDEs with constant characteristic velocities. The travelling wave solutions for the two-particle T-Strand equations are solved geometrically, and their Lax pair is given to show how nonlinearity affects the solution. The three-particle T-Strands equations are also derived from Hamilton's principle. For both the two-particle and three-particle T-Strand PDEs the determining conditions for the existence of a quadratic zero-curvature relation (ZCR) exactly cancel the nonlinear terms in the PDEs. Thus, the two-particle and three-particle T-Strand PDEs do not pass the ZCR test for integrability.

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