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arXiv 0905.2093nlin.SI
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Kadomtsev-Petviashvili方程的微分约化及其高维非线性偏微分方程

Differential reductions of the Kadomtsev-Petviashvili equation and associated higher dimensional nonlinear PDEs

A. I. Zenchuk

摘要:

我们提出了一种算法,允许一个部分可积的多维非线性偏微分方程(PDE)的特殊类型的解决方案的(1+1)维的非线性偏微分方程的线性化矩阵的霍普夫-科尔替代(Bürgers层次)开始,以构建新的类。我们推导出四维非线性矩阵偏微分方程的例子,连同他们的标量和三维减少。Kadomtsev-Petviashvili型和Korteweg-de Vries型方程的变体在其中表示。我们的算法是基于两个Frobenius型减少和特殊的微分减少施加在可积偏微分方程的矩阵字段的组合。结果表明,所导出的四维非线性偏微分方程的解空间中可以存在任意二元函数,从而阐明了这些偏微分方程的可积性。

英文摘要:

We represent an algorithm allowing one to construct new classes of partially integrable multidimensional nonlinear partial differential equations (PDEs) starting with the special type of solutions to the (1+1)-dimensional hierarchy of nonlinear PDEs linearizable by the matrix Hopf-Cole substitution (the Bürgers hierarchy). We derive examples of four-dimensional nonlinear matrix PDEs together with they scalar and three-dimensional reductions. Variants of the Kadomtsev-Petviashvili type and Korteweg-de Vries type equations are represented among them. Our algorithm is based on the combination of two Frobenius type reductions and special differential reduction imposed on the matrix fields of integrable PDEs. It is shown that the derived four-dimensional nonlinear PDEs admit arbitrary functions of two variables in their solution spaces which clarifies the integrability degree of these PDEs.

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