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arXiv 0705.0120nlin.SI
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有理Lax矩阵的有效谱逆问题及其应用

Effective inverse spectral problem for rational Lax matrices and applications

Marco Bertola, Mikael Gekhtman

摘要:

我们重建一个合理的拉克斯矩阵的大小R+1从它的谱曲线(去奇异化的特征多项式)和一些额外的数据。利用一个扭曲的Cauchy核(一个双权的双微分(1-nu,nu)),我们分别给出了Lax矩阵的项关于权nu和1-nu的对偶微分的基的剩余公式.所有对象都使用Theta函数以最明确的术语描述。通过一系列的“初等扭”,我们构造了具有相同谱曲线和极结构的Lax矩阵序列,并通过有理矩阵的共轭来关联。特别选择的基本扭曲导致建设的序列相关的Lax矩阵有限带递归关系(即差分算子)共享相同的形状。这类递推关系由几类正交和双正交多项式满足。这些多项式的大程度渐近的研究所获得的公式的相关性表示。

英文摘要:

We reconstruct a rational Lax matrix of size R+1 from its spectral curve (the desingularization of the characteristic polynomial) and some additional data. Using a twisted Cauchy--like kernel (a bi-differential of bi-weight (1-nu,nu)) we provide a residue-formula for the entries of the Lax matrix in terms of bases of dual differentials of weights nu and 1-nu respectively. All objects are described in the most explicit terms using Theta functions. Via a sequence of ``elementary twists'', we construct sequences of Lax matrices sharing the same spectral curve and polar structure and related by conjugations by rational matrices. Particular choices of elementary twists lead to construction of sequences of Lax matrices related to finite--band recurrence relations (i.e. difference operators) sharing the same shape. Recurrences of this kind are satisfied by several types of orthogonal and biorthogonal polynomials. The relevance of formulae obtained to the study of the large degree asymptotics for these polynomials is indicated.

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