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局部Yang--Baxter对应与Zamolodchikov四面体方程的集合论解

Local Yang--Baxter correspondences and set-theoretical solutions to the Zamolodchikov tetrahedron equation

S. Igonin, S. Konstantinou-Rizos

AI总结:

本文研究了Zamolodchikov四面体方程的集合论解及其局部Yang--Baxter方程的矩阵Lax表示,发现了不属于Sergeev分类列表的新四面体映射,证明了部分映射的Liouville可积性,并导出了多个新的双有理四面体映射。

摘要:

我们研究四面体映射(即Zamolodchikov四面体方程的集合论解)及其由局部Yang--Baxter方程定义的矩阵Lax表示。Sergeev [S.M. Sergeev 1998 Lett. Math. Phys. 45, 113--119] 针对由特定类别的矩阵函数导出的三维四面体映射给出了分类结果,其前提是该方程具有唯一解并由此确定一个四面体映射。在本文中,利用某些简单的 $2\ imes 2$ 矩阵函数的局部Yang--Baxter方程所产生的对应关系,我们证明了存在(非唯一的)局部Yang--Baxter方程的解,这些解所定义的四面体映射不属于Sergeev列表;这为四面体映射的一种新的、更广泛的分类铺平了道路。我们给出了所导出的四面体映射的不变量,并证明了其中部分映射的Liouville可积性。此外,利用求解由局部Yang--Baxter方程产生的对应关系的方法,我们获得了几个新的双有理四面体映射,包括在任意群上具有矩阵Lax表示的映射、一个与导数非线性Schrödinger (NLS) 方程的Darboux变换相关联的 $9$ 维映射,以及 $3$ 维Hirota映射的一个 $9$ 维推广。

英文摘要:

We study tetrahedron maps, which are set-theoretical solutions to the Zamolodchikov tetrahedron equation, and their matrix Lax representations defined by the local Yang--Baxter equation. Sergeev [S.M. Sergeev 1998 Lett. Math. Phys. 45, 113--119] presented classification results on three-dimensional tetrahedron maps obtained from the local Yang--Baxter equation for a certain class of matrix-functions in the situation when the equation possesses a unique solution which determines a tetrahedron map. In this paper, using correspondences arising from the local Yang--Baxter equation for some simple $2\times 2$ matrix-functions, we show that there are (non-unique) solutions to the local Yang--Baxter equation which define tetrahedron maps that do not belong to the Sergeev list; this paves the way for a new, wider classification of tetrahedron maps. We present invariants for the derived tetrahedron maps and prove Liouville integrability for some of them. Furthermore, using the approach of solving correspondences arising from the local Yang--Baxter equation, we obtain several new birational tetrahedron maps, including maps with matrix Lax representations on arbitrary groups, a $9$-dimensional map associated with a Darboux transformation for the derivative nonlinear Schrödinger (NLS) equation, and a $9$-dimensional generalisation of the $3$-dimensional Hirota map.

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