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arXiv 0811.2605math.CAmath-phmath.MP
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单位圆上的双正交系、正则半经典权和离散Garnier方程

Bi-orthogonal systems on the unit circle, regular semi-classical weights and the discrete Garnier equations

N. S. Witte

摘要:

证明了在单位圆上对应于正则半经典权的双正交多项式组及其相关函数构成了Garnier系统的一类一般经典解,通过明确地构造其Hamilton形式并证明它与Garnier系统的Hamilton形式一致.这样的系统也可以通过离散Painlevé型的递归关系来表征,例如在具有一个自由变形变量的情况下,发现系统的特征在于离散第五Painlevé方程的解。在这里,我们推导出的规范形式的离散第五Painlevé方程的多变量推广到卡尼尔系统,即任意数量的变形变量。

英文摘要:

We demonstrate that a system of bi-orthogonal polynomials and their associated functions corresponding to a regular semi-classical weight on the unit circle constitute a class of general classical solutions to the Garnier systems by explicitly constructing its Hamiltonian formulation and showing that it coincides with that of a Garnier system. Such systems can also be characterised by recurrence relations of the discrete Painlevé type, for example in the case with one free deformation variable the system was found to be characterised by a solution to the discrete fifth Painlevé equation. Here we derive the canonical forms of the multi-variable generalisation of the discrete fifth Painlevé equation to the Garnier systems, i.e. for arbitrary numbers of deformation variables.

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