Binary Bargmann symmetry constraint and algebro-geometric solutions of a semidiscrete integrable hierarchy

IF 1 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Theoretical and Mathematical Physics Pub Date : 2024-11-26 DOI:10.1134/S0040577924110084
Yaxin Guan, Xinyue Li, Qiulan Zhao
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Abstract

We present the binary Bargmann symmetry constraint and algebro-geometric solutions for a semidiscrete integrable hierarchy with a bi-Hamiltonian structure. First, we derive a hierarchy associated with a discrete spectral problem by applying the zero-curvature equation and study its bi-Hamiltonian structure. Then, resorting to the binary Bargmann symmetry constraint for the potentials and eigenfunctions, we decompose the hierarchy into an integrable symplectic map and finite-dimensional integrable Hamiltonian systems. Moreover, with the help of the characteristic polynomial of the Lax matrix, we propose a trigonal curve encompassing two infinite points. On this trigonal curve, we introduce a stationary Baker–Akhiezer function and a meromorphic function, and analyze their asymptotic properties and divisors. Based on these preparations, we obtain algebro-geometric solutions for the hierarchy in terms of the Riemann theta function.

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半离散可积分层次结构的二元巴格曼对称性约束和积分几何解
我们提出了具有双哈密尔顿结构的半离散可积分层次结构的二元巴格曼对称约束和几何代数解。首先,我们应用零曲率方程推导出与离散谱问题相关的层次结构,并研究其双哈密顿结构。然后,借助电势和特征函数的二元巴格曼对称约束,我们将层次结构分解为可积分交映射和有限维可积分哈密顿系统。此外,借助拉克斯矩阵的特征多项式,我们提出了一条包含两个无限点的三叉曲线。在这条三叉曲线上,我们引入了一个静止的贝克-阿基泽函数和一个分形函数,并分析了它们的渐近性质和除数。在这些准备工作的基础上,我们用黎曼 Theta 函数得到了层次结构的等距几何解。
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来源期刊
Theoretical and Mathematical Physics
Theoretical and Mathematical Physics 物理-物理:数学物理
CiteScore
1.60
自引率
20.00%
发文量
103
审稿时长
4-8 weeks
期刊介绍: Theoretical and Mathematical Physics covers quantum field theory and theory of elementary particles, fundamental problems of nuclear physics, many-body problems and statistical physics, nonrelativistic quantum mechanics, and basic problems of gravitation theory. Articles report on current developments in theoretical physics as well as related mathematical problems. Theoretical and Mathematical Physics is published in collaboration with the Steklov Mathematical Institute of the Russian Academy of Sciences.
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