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arXiv math-ph/0604012math-phmath.MP
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具有外部源的Gaussian和Wishart矩阵的渐近相关性

Asymptotic correlations for Gaussian and Wishart matrices with external source

Patrick Desrosiers, Peter J. Forrester

摘要:

我们考虑高斯(Hermite)和Wishart(Laguerre)$N\times N$厄米矩阵的系综。我们研究的效果有限秩扰动这些合奏的源项。扰动的秩$r$对应于源矩阵的非零特征值的数目。在扰动系综中,关联函数可以写成核函数。我们发现,对于所有的$N$,扰动和未扰动的内核之间的差异是一个退化的内核大小$r$依赖于多个厄米或拉盖尔函数。我们还计算渐近公式的多个Laguerre函数内核的条款多个贝塞尔(分别。Airy)函数。这导致了大的$N$限制硬核(分别为:软)的扰动拉盖尔系综的频谱边缘。在Hermite情况下也得到了类似的结果。

英文摘要:

We consider ensembles of Gaussian (Hermite) and Wishart (Laguerre) $N\times N$ hermitian matrices. We study the effect of finite rank perturbations of these ensembles by a source term. The rank $r$ of the perturbation corresponds to the number of non-null eigenvalues of the source matrix. In the perturbed ensembles, the correlation functions can be written in terms of kernels. We show that for all $N$, the difference between the perturbed and the unperturbed kernels is a degenerate kernel of size $r$ which depends on multiple Hermite or Laguerre functions. We also compute asymptotic formulas for the multiple Laguerre functions kernels in terms multiple Bessel (resp. Airy) functions. This leads to the large $N$ limiting kernels at the hard (resp. soft) edge of the spectrum of the perturbed Laguerre ensemble. Similar results are obtained in the Hermite case.

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