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arXiv 0903.1827math.QAmath-phmath.MP
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具有一次多项式2 × 2 Lax矩阵的Yang Baxter映射

Yang Baxter maps with first degree polynomial 2 by 2 Lax matrices

Theodoros E. Kouloukas, Vassilios G. Papageorgiou

摘要:

通过重构两个一次2 × 2矩阵多项式的乘积,构造了一族非参数杨巴克斯特(YB)映射。这些映射是关于Sklyanin括号的泊松。对于每个Casimir函数,通过在相应的水平集上约简生成参数Poisson YB映射。通过考虑Casimir函数的完备集,导出了辛多参数YB映射.这些映射都是四有理的,并具有矩阵运算的显式公式。它们的Lax矩阵在构造上是2 × 2的谱参数一次多项式,并按其首项的Jordan标准形分类。构造非四有理参数YB映射作为四有理映射的极限,并将其与四图上已知的可积系统相连接。

英文摘要:

A family of nonparametric Yang Baxter (YB) maps is constructed by refactorization of the product of two 2 by 2 matrix polynomials of first degree. These maps are Poisson with respect to the Sklyanin bracket. For each Casimir function a parametric Poisson YB map is generated by reduction on the corresponding level set. By considering a complete set of Casimir functions symplectic multiparametric YB maps are derived. These maps are quadrirational with explicit formulae in terms of matrix operations. Their Lax matrices are, by construction, 2 by 2 first degree polynomial in the spectral parameter and are classified by Jordan normal form of the leading term. Nonquadrirational parametric YB maps constructed as limits of the quadrirational ones are connected to known integrable systems on quad graphs.

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