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arXiv 1708.06950math.PRmath.SP
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非Hermite随机矩阵及其乘积的局部律

On Local laws for non-Hermitian random matrices and their products

Friedrich Götze, Alexey Naumov, Alexander Tikhomirov

摘要:

本文的目的是证明非Hermite随机矩阵的循环律的一个局部形式,并在弱矩条件下将其推广到非Hermite随机矩阵的乘积。更精确地,我们假设非厄米特随机矩阵${\bf X}^{(q)}, 1 \le j,k \le n, q = 1, \ldots, m, m \geq 1$的项$X_{jk}^{(q)}$是i.i.d.静脉注射$\mathbb E X_{jk} =0, \mathbb E X_{jk}^2 = 1$和$\mathbb E |X_{jk}|^{4+δ} < \infty$,以治疗某些$δ> 0$。结果表明,局部律在最优尺度$n^{-1+2a}, a > 0$上,直到某个对数因子都成立。我们进一步发展了Stein型方法来估计极限分布的斯蒂尔切斯变换方程的扰动。我们还推广了最近的结果[Bourgeon-Yau-Yin,2014],[Tao-Vu,2015]和[Nemish,2017]。对非独立同分布情况的扩展。参赛作品进行了讨论。

英文摘要:

The aim of this paper is to prove a local version of the circular law for non-Hermitian random matrices and its generalization to the product of non-Hermitian random matrices under weak moment conditions. More precisely we assume that the entries $X_{jk}^{(q)}$ of non-Hermitian random matrices ${\bf X}^{(q)}, 1 \le j,k \le n, q = 1, \ldots, m, m \geq 1$ are i.i.d. r.v. with $\mathbb E X_{jk} =0, \mathbb E X_{jk}^2 = 1$ and $\mathbb E |X_{jk}|^{4+δ} < \infty$ for some $δ> 0$. It is shown that the local law holds on the optimal scale $n^{-1+2a}, a > 0$, up to some logarithmic factor. We further develop a Stein type method to estimate the perturbation of the equations for the Stieltjes transform of the limiting distribution. We also generalize the recent results [Bourgade--Yau-Yin, 2014], [Tao--Vu, 2015] and [Nemish, 2017]. An extension to the case of non-i.i.d. entries is discussed.

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