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arXiv 1808.03261nlin.SImath-phmath.MP
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Toda格的一个新的可积推广和离散Yajima-Oikawa系统

On a new integrable generalization of the Toda lattice and a discrete Yajima-Oikawa system

Takayuki Tsuchida

摘要:

我们提出了一个新的可积推广的户田格,其中原来的Flaschka-Manakov变量耦合到新引入的因变量;一般情况下,其中额外的因变量被认为是向量值。这种推广承认一个拉克斯对的基础上扩展的雅可比算子,一个无限数量的守恒律,并在特殊情况下,一个简单的哈密顿结构。事实上,当附加的因变量消失时,这个广义Toda层次的第二个流减少到通常的Toda晶格;层次的第一个流减少到长波-短波相互作用模型,称为Yajima-Oikawa系统,在适当的连续极限。Yajima-Oikawa系统的这种可积离散化本质上不同于arXiv:1509.06996中提出的离散Yajima-Oikawa系统(也参见https://link.aps.org/doi/10.1103/PhysRevE.91.062902),并在arXiv:1804.10224中进行了研究。非线性薛定谔方程族的两个可积离散化:Ablowitz-Ladik方程族和Konopelchenko-Chudnovsky方程族作为特例包含在广义Toda方程族中.

英文摘要:

We propose a new integrable generalization of the Toda lattice wherein the original Flaschka-Manakov variables are coupled to newly introduced dependent variables; the general case wherein the additional dependent variables are vector-valued is considered. This generalization admits a Lax pair based on an extension of the Jacobi operator, an infinite number of conservation laws and, in a special case, a simple Hamiltonian structure. In fact, the second flow of this generalized Toda hierarchy reduces to the usual Toda lattice when the additional dependent variables vanish; the first flow of the hierarchy reduces to a long wave-short wave interaction model, known as the Yajima-Oikawa system, in a suitable continuous limit. This integrable discretization of the Yajima-Oikawa system is essentially different from the discrete Yajima-Oikawa system proposed in arXiv:1509.06996 (also see https://link.aps.org/doi/10.1103/PhysRevE.91.062902) and studied in arXiv:1804.10224. Two integrable discretizations of the nonlinear Schrödinger hierarchy, the Ablowitz-Ladik hierarchy and the Konopelchenko-Chudnovsky hierarchy, are contained in the generalized Toda hierarchy as special cases.

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