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arXiv 0711.4432math-phmath.MP
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经典斜正交多项式的广义Christoffel-Darboux公式

Generalized Christoffel-Darboux formula for classical skew-orthogonal polynomials

Ghosh Saugata

摘要:

证明了关于Jacobi权$w_{a,b}(x)={(1-x)}^a{(1+x)}^b$,$a$,$b>-1$定义的斜正交函数,包括Laguerre权($w_{a}(x)=x^{a}e^{-x}$,$a > -1$)和高斯权($w(x)=e^{-x^2}$)的极限情形,在四元数空间中满足三项递归关系.由此,我们推导出了随机$2N\times 2N$矩阵正交系综和辛系综的核函数的广义Christoffel-Darboux(GCD)公式。我们用GCD公式计算了能级密度,证明了在适当的尺度下,在谱的大部分中,本征值关联是普适的。我们还提供了证据表明,存在着斜正交函数之间的映射所产生的正交和辛系综的随机矩阵的研究。

英文摘要:

We show that skew-orthogonal functions, defined with respect to Jacobi weight $w_{a,b}(x)={(1-x)}^a{(1+x)}^b$, $a$, $b>-1$, including the limiting cases of Laguerre ($w_{a}(x)=x^{a}e^{-x}$, $a > -1$) and Gaussian weight ($w(x)=e^{-x^2}$), satisfy three-term recursion relation in the quaternion space. From this, we derive generalized Christoffel-Darboux (GCD) formulæ for kernel functions arising in the study of the corresponding orthogonal and symplectic ensembles of random $2N\times 2N$ matrices. Using the GCD formulæwe calculate the level-densities and prove that in the bulk of the spectrum, under appropriate scaling, the eigenvalue correlations are universal. We also provide evidence to show that there exists a mapping between skew-orthogonal functions arising in the study of orthogonal and symplectic ensembles of random matrices.

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