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arXiv 1201.4789math.PR
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随机矩阵:特征值的急剧集中

Random matrices: Sharp concentration of eigenvalues

Terence Tao, Van Vu

摘要:

令$W_n= \frac{1}{\sqrt n} M_n$是其条目具有消失的三阶矩的维格纳矩阵,归一化使得频谱集中在间隔$[-2,2]$中。我们证明了$N_I = N_I(W_n)$的一个浓度界,即$W_n$在一个区间$I$中的特征值的个数。我们的结果表明,$N_I$指数衰减的标准差最多$O(\log^{O(1)} n)$。这是最好的可能达到常数指数的对数项。作为推论,体特征值被局部化到宽度为$O(\log^{O(1)} n/n)$的区间;同样,这是最优的,直到指数。这些结果加强了Erdos,Yau和Yin(在三分之一消失的额外假设下)的最近结果

英文摘要:

Let $W_n= \frac{1}{\sqrt n} M_n$ be a Wigner matrix whose entries have vanishing third moment, normalized so that the spectrum is concentrated in the interval $[-2,2]$. We prove a concentration bound for $N_I = N_I(W_n)$, the number of eigenvalues of $W_n$ in an interval $I$. Our result shows that $N_I$ decays exponentially with standard deviation at most $O(\log^{O(1)} n)$. This is best possible up to the constant exponent in the logarithmic term. As a corollary, the bulk eigenvalues are localized to an interval of width $O(\log^{O(1)} n/n)$; again, this is optimal up to the exponent. These results strengthen recent results of Erdos, Yau and Yin (under the extra assumption of vanishing third

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