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arXiv 0811.4027math.CAmath-phmath.MP
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单位圆上的双正交系、正则半经典权与可积系统- II

Bi-orthogonal systems on the unit circle, Regular Semi-Classical Weights and Integrable Systems - II

N. S. Witte

摘要:

本文导出了单位圆上双正交多项式及其相关函数的Christoffel-Geronimus-Uvarov变换,即对应于权函数的有理变换的变换.在特殊化的权函数的经常半经典的情况下,与任意数量的经常奇点$ \{z_1, ..., z_M \} $的双正交系是已知的是isomonodromy保持相对于变形的奇点。如果Christoffel-Geronimus-Uvarov因子的零点和极点与奇点重合,那么我们就得到了这个等单轨道系统的Schlesinger变换。明确推导了Schlesinger变换与系统的其它结构--递推关系、谱导数和形变导数的相容性。对于系统的$ τ$ -函数或等价的Toeplitz行列式导出了各种形式的Hirota-Miwa方程。

英文摘要:

We derive the Christoffel-Geronimus-Uvarov transformations of a system of bi-orthogonal polynomials and associated functions on the unit circle, that is to say the modification of the system corresponding to a rational modification of the weight function. In the specialisation of the weight function to the regular semi-classical case with an arbitrary number of regular singularities $ \{z_1, ..., z_M \} $ the bi-orthogonal system is known to be isomonodromy preserving with respect to deformations of the singular points. If the zeros and poles of the Christoffel-Geronimus-Uvarov factors coincide with the singularities then we have the Schlesinger transformations of this isomonodromic system. Compatibility of the Schlesinger transformations with the other structures of the system - the recurrence relations, the spectral derivatives and deformation derivatives is explicitly deduced. Various forms of Hirota-Miwa equations are derived for the $ τ$-functions or equivalently Toeplitz determinants of the system.

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