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arXiv 1306.2242math-phmath.MP
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非对称相关矩阵Wishart模型的谱密度

Spectral density of a Wishart model for nonsymmetric Correlation Matrices

Vinayak

摘要:

实对称相关矩阵的Wishart模型被定义为$\mathsf{W}=\mathsf{AA}^{t}$,其中矩阵$\mathsf{A}$通常是矩形高斯随机矩阵,并且$\mathsf{A}^{t}$是$\mathsf{A}$的转置。类似地,对于非对称相关矩阵,可以将两个统计上等效但不同的矩阵$\mathsf{A}$和$\mathsf{B}$的模型定义为$\mathsf{AB}^{t}$。因此,相应的Wishart模型被定义为$\mathbf{C}=\mathsf{AB}^{t}\mathsf{BA}^{t}$。我们研究了当$\mathsf{A}$和$\mathsf{B}$在统计上不独立时$\mathbf{C}$的谱密度。因此,这种非对称矩阵的系综平均值不会简单地消失为零矩阵。本文导出了描述大$\mathbf{C}$谱密度的Pastur自洽方程。我们用数值方法来补充我们的分析结果。

英文摘要:

The Wishart model for real symmetric correlation matrices is defined as $\mathsf{W}=\mathsf{AA}^{t}$, where matrix $\mathsf{A}$ is usually a rectangular Gaussian random matrix and $\mathsf{A}^{t}$ is the transpose of $\mathsf{A}$. Analogously, for nonsymmetric correlation matrices, a model may be defined for two statistically equivalent but different matrices $\mathsf{A}$ and $\mathsf{B}$ as $\mathsf{AB}^{t}$. The corresponding Wishart model, thus, is defined as $\mathbf{C}=\mathsf{AB}^{t}\mathsf{BA}^{t}$. We study the spectral density of $\mathbf{C}$ for the case when $\mathsf{A}$ and $\mathsf{B}$ are not statistically independent. The ensemble average of such nonsymmetric matrices, therefore, does not simply vanishes to a null matrix. In this paper we derive a Pastur self-consistent equation which describes spectral density of large $\mathbf{C}$. We complement our analytic results with numerics.

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