格点KdV方程的本征函数方程及其与含$δ$项的ABS格点方程的联系
Eigenfunction equations of lattice KdV equations and connections to ABS lattice equations with a $δ$ term
摘要:
我们建立了格点KdV方程的格点本征函数方程,它是格点KdV方程的拉克斯对的辅助函数或本征函数所服从的方程。这导致了三维一致的四方程,密切相关的晶格方程中的Adler-Bobenko-Suris(ABS)分类。特别是,我们展示了如何H3($δ$),Q1($δ$)和Q3($δ$)在ABS列表中的方程产生的晶格本征函数方程通过提供一个自然的解释的$δ$长期作为本征函数之间的相互作用。通过构造,得到了这些方程的精确解结构。本文提出的方法可以作为一种系统的手段来寻找可积格方程。
英文摘要:
We develop lattice eigenfunction equations of lattice KdV equation, which are equations obeyed by the auxiliary functions, or eigenfunctions, of the Lax pair of the lattice KdV equation. This leads to three-dimensionally consistent quad-equations that are closely related to lattice equations in the Adler-Bobenko-Suris (ABS) classification. In particular, we show how the H3($δ$), Q1($δ$) and Q3($δ$) equations in the ABS list arise from the lattice eigenfunction equations by providing a natural interpretation of the $δ$ term as interactions between the eigenfunctions. By construction, exact solution structures of these equations are obtained. The approach presented in this paper can be used as a systematic means to search for integrable lattice equations.
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