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arXiv math-ph/0504053math-phcond-mat.stat-mechmath.MP
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对GUE和LUE特征值密度的渐近修正

Asymptotic corrections to the eigenvalue density of the GUE and LUE

T. M. Garoni, P. J. Forrester, N. E. Frankel

摘要:

我们得到的高斯酉和Laguerre酉系综的随机N乘N矩阵的特征值密度的大N渐近展开的校正项,无论是在大部分的频谱和附近的频谱边缘。这是通过使用众所周知的正交多项式表达的内核构建一个双轮廓积分表示的密度,我们应用鞍点方法。对堆积密度的主要修正在N中是振荡的,并且取决于极限密度的分布函数,而对软边缘处的艾里核的修正再次用艾里函数及其一阶导数表示。我们证明了数值,这些扩展是非常准确的。一个匹配之间表现出的体积密度的渐近展开,扩大的边缘,和边缘密度的渐近展开,扩大到散装。

英文摘要:

We obtain correction terms to the large N asymptotic expansions of the eigenvalue density for the Gaussian unitary and Laguerre unitary ensembles of random N by N matrices, both in the bulk of the spectrum and near the spectral edge. This is achieved by using the well known orthogonal polynomial expression for the kernel to construct a double contour integral representation for the density, to which we apply the saddle point method. The main correction to the bulk density is oscillatory in N and depends on the distribution function of the limiting density, while the corrections to the Airy kernel at the soft edge are again expressed in terms of the Airy function and its first derivative. We demonstrate numerically that these expansions are very accurate. A matching is exhibited between the asymptotic expansion of the bulk density, expanded about the edge, and the asymptotic expansion of the edge density, expanded into the bulk.

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