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arXiv math-ph/0608052math-phmath.MP
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关于双正交系综的一个注记

A note on biorthogonal ensembles

Patrick Desrosiers, Peter J. Forrester

摘要:

我们考虑随机矩阵的系综,称为双正交系综,其特征值概率密度函数可以写成两个行列式的乘积。这些系统与多个正交函数密切相关。已知这种系综的本征值关联函数可以写成核函数的行列式。我们表明,内核本身是一个单一的比率的特征多项式的平均值。同样,我们证明了第一类多重多项式可以表示为一个特征多项式的逆的平均。最后,我们引入了一种新的双正交矩阵系综,即受源项扰动的手征么正系综。

英文摘要:

We consider ensembles of random matrices, known as biorthogonal ensembles, whose eigenvalue probability density function can be written as a product of two determinants. These systems are closely related to multiple orthogonal functions. It is known that the eigenvalue correlation functions of such ensembles can be written as a determinant of a kernel function. We show that the kernel is itself an average of a single ratio of characteristic polynomials. In the same vein, we prove that the type I multiple polynomials can be expressed as an average of the inverse of a characteristic polynomial. We finally introduce a new biorthogonal matrix ensemble, namely the chiral unitary perturbed by a source term.

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