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arXiv 2007.10382nlin.SImath-phmath.MP
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Davey-Stewartson系统和$(2+1)$维Yajima-Oikawa系统的可积半离散化II

Integrable semi-discretizations of the Davey-Stewartson system and a $(2+1)$-dimensional Yajima-Oikawa system. II

Takayuki Tsuchida

摘要:

这是我们以前的论文arXiv:1904.07924的延续,该论文致力于Davey-Stewartson系统和$(2+1)$维Yajima-Oikawa系统的可积半离散化的构造;在这一系列论文中,我们将两个空间变量之一的离散化称为半离散化。本文构造了一个可积的半离散Davey-Stewartson系统,它与arXiv:1904.07924中提出的半离散Davey-Stewartson系统有本质的不同.我们首先获得可积半离散化的两个基本流组成的Davey-Stewartson系统,通过构建他们的Lax对表示,并表明这两个基本流在连续的情况下交换。然后,我们考虑这两个基本流的线性组合,得到Davey-Stewartson系统的一个新的可积半离散化。利用连续自变量的线性变换,两个基本Davey-Stewartson流中的一个可以用https://link.aps.org/doi/10.1103/PhysRevE.91.062902中提出的$(2+1)$维Yajima-Oikawa系统的可积半离散化来识别.

英文摘要:

This is a continuation of our previous paper arXiv:1904.07924, which is devoted to the construction of integrable semi-discretizations of the Davey-Stewartson system and a $(2+1)$-dimensional Yajima-Oikawa system; in this series of papers, we refer to a discretization of one of the two spatial variables as a semi-discretization. In this paper, we construct an integrable semi-discrete Davey-Stewartson system, which is essentially different from the semi-discrete Davey-Stewartson system proposed in the previous paper arXiv:1904.07924. We first obtain integrable semi-discretizations of the two elementary flows that compose the Davey-Stewartson system by constructing their Lax-pair representations and show that these two elementary flows commute as in the continuous case. Then, we consider a linear combination of the two elementary flows to obtain a new integrable semi-discretization of the Davey-Stewartson system. Using a linear transformation of the continuous independent variables, one of the two elementary Davey-Stewartson flows can be identified with an integrable semi-discretization of the $(2+1)$-dimensional Yajima-Oikawa system proposed in https://link.aps.org/doi/10.1103/PhysRevE.91.062902 .

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