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arXiv math-ph/0507060math-phmath.MPmath.PR
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高斯元随机矩阵的矩估计

Estimates for moments of random matrices with Gaussian elements

O. Khorunzhiy

摘要:

给出了元素为高斯独立随机变量的Hermitian随机矩阵的矩的非渐近估计的一种初等方法。作为基本的例子,我们考虑GUE矩阵。直接的应用包括GOE和高斯反对称厄米矩阵的系综。我们得到的估计给出渐近精确的表达式的第一项的1/N-展开的时刻和协方差项。我们将我们的方法应用于高斯厄米随机带矩阵的系综,其元素在宽度b的带外为零。我们得到的估计表明,这些矩阵的谱范数保持在无限N的极限有界时,b是远远大于log N的3/2的权力。

英文摘要:

We describe an elementary method to get non-asymptotic estimates for the moments of Hermitian random matrices whose elements are Gaussian independent random variables. As the basic example, we consider the GUE matrices. Immediate applications include GOE and the ensemble of Gaussian anti-symmetric Hermitian matrices. The estimates we derive give asymptotically exact expressions for the first terms of 1/N-expansions of the moments and covariance terms. We apply our method to the ensemble of Gaussian Hermitian random band matrices whose elements are zero outside of the band of width b. The estimates we obtain show that the spectral norm of these matrices remains bounded in the limit of infinite N when b is much greater than log N to the power 3/2.

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