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arXiv 1009.0145math.PR
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随机矩阵有限秩变形极值特征值的涨落

Fluctuations of the extreme eigenvalues of finite rank deformations of random matrices

Florent Benaych-Georges, Alice Guionnet, Mylène Maïda

摘要:

考虑确定性自伴随矩阵X_n的谱测度收敛到紧支撑的概率测度,最大和最小特征值收敛到极限测度的边.我们扰动这个矩阵,通过添加一个随机的有限秩矩阵的离域特征向量和研究的极端特征值的变形模型。我们给出了确定性矩阵X_n的必要条件,使得在体元外收敛的本征值呈现高斯涨落,而在边缘处的本征值与非微扰模型的本征值非常接近,并在同一尺度上涨落.我们把这些结果推广到X_n是随机的情况,并对一些经典的模型如具有较一般元素的Wigner矩阵或Wishart矩阵或所谓的矩阵模型进行形变,得到类似的结果。

英文摘要:

Consider a deterministic self-adjoint matrix X_n with spectral measure converging to a compactly supported probability measure, the largest and smallest eigenvalues converging to the edges of the limiting measure. We perturb this matrix by adding a random finite rank matrix with delocalized eigenvectors and study the extreme eigenvalues of the deformed model. We give necessary conditions on the deterministic matrix X_n so that the eigenvalues converging out of the bulk exhibit Gaussian fluctuations, whereas the eigenvalues sticking to the edges are very close to the eigenvalues of the non-perturbed model and fluctuate in the same scale. We generalize these results to the case when X_n is random and get similar behavior when we deform some classical models such as Wigner or Wishart matrices with rather general entries or the so-called matrix models.

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