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arXiv 2602.14739nlin.SI
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一阶和三阶哈密顿算子的兼容对

Compatible pairs of Hamiltonian operators of the first and third orders

University of Milano-Bicocca(米兰比可卡大学);INFN sezione di Milano-Bicocca(米兰比可卡大学意大利国家核物理研究所分部);INFN Sezione di Lecce(莱切意大利国家核物理研究所分部);Institute of Mathematics of NAS of Ukraı̈ne(乌克兰国家科学院数学研究所)

Paolo Lorenzoni, Stanislav Opanasenko, Raffaele Vitolo

AI总结:

研究一阶和三阶弱非局域齐次哈密顿算子的兼容条件,揭示其在可积PDEs中的生物哈密顿结构,通过代数条件确定一阶算子与守恒律的兼容性。

摘要:

我们计算了弱非局域齐次哈密顿算子与三阶齐次哈密顿算子之间的通用兼容条件。此类算子决定了许多可积偏微分方程(如Korteweg-de Vries、Camassa-Holm、分散水波、Dym、WDVV等)的双哈密顿结构。值得注意的是,完整的条件集完全是代数的,并且一阶算子完全由与三阶算子相关的守恒律兼容系统决定。我们通过几个例子说明了上述结果,其中一些涉及WDVV方程,是新的。

英文摘要:

We compute general compatibility conditions between a weakly nonlocal homogeneous Hamiltonian operator and a third-order homogeneous Hamiltonian operator. Such operators determine a bi-Hamiltonian structure for many integrable PDEs (Korteweg--De Vries, Camassa--Holm, dispersive water waves, Dym, WDVV and others). Remarkably, the full set of conditions is purely algebraic and the first-order operator is completely determined by commuting systems of conservation laws that are Hamiltonian with respect to a third-order operator. We illustrate the above results with several examples, some of which, concerning WDVV equations, are new.

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。

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