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arXiv 0911.0941nlin.SImath.CA
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多分量二维Toda族:广义矩阵正交多项式、多重正交多项式和Riemann-Hilbert问题

The multicomponent 2D Toda hierarchy: generalized matrix orthogonal polynomials, multiple orthogonal polynomials and Riemann--Hilbert problems

Carlos Alvarez-Fernandez, Ulises Fidalgo, Manuel Manas

摘要:

我们考虑了多分量二维Toda族与矩阵正交和双正交多项式的关系。考虑了该族的多级Hankel约化,并研究了相应的广义矩阵正交多项式。特别是对于这些多项式,我们考虑的递归关系,并为秩一权重的关系与多个正交多项式的混合型与II型规范化和相应的链接与黎曼-希尔伯特问题。

英文摘要:

We consider the relation of the multi-component 2D Toda hierarchy with matrix orthogonal and biorthogonal polynomials. The multi-graded Hankel reduction of this hierarchy is considered and the corresponding generalized matrix orthogonal polynomials are studied. In particular for these polynomials we consider the recursion relations, and for rank one weights its relation with multiple orthogonal polynomials of mixed type with a type II normalization and the corresponding link with a Riemann--Hilbert problem.

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