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arXiv 1004.4155math.PRmath.OA
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大型随机和确定性矩阵中多项式的范数

The norm of polynomials in large random and deterministic matrices

C. Male

摘要:

令X_N=(X_1^(N),.,X_p^(N))是来自高斯酉集合的N × N独立的归一化随机矩阵族。本文给出充分条件矩阵Y_N =(Y_1^(N),.,Y_q^(N)),可能是随机的,但与X_N无关,对于它,P(X_N,Y_N,Y_N^*)的算子范数对所有多项式P几乎必然收敛。极限由自由概率论中对象的算子范数描述。利用矩阵Y_N和多项式P的选择,我们得到了一大类矩阵的“极限谱邻域外无特征值”现象。我们给出了收敛性成立的对角矩阵Y_N的例子。收敛的运营商规范持有块矩阵,即使与矩形高斯块,包括非白色Wishart矩阵和MIMO系统中遇到的一些矩阵的情况。

英文摘要:

Let X_N= (X_1^(N), ..., X_p^(N)) be a family of N-by-N independent, normalized random matrices from the Gaussian Unitary Ensemble. We state sufficient conditions on matrices Y_N =(Y_1^(N), ..., Y_q^(N)), possibly random but independent of X_N, for which the operator norm of P(X_N, Y_N, Y_N^*) converges almost surely for all polynomials P. Limits are described by operator norms of objects from free probability theory. Taking advantage of the choice of the matrices Y_N and of the polynomials P we get for a large class of matrices the "no eigenvalues outside a neighborhood of the limiting spectrum" phenomena. We give examples of diagonal matrices Y_N for which the convergence holds. Convergence of the operator norm is shown to hold for block matrices, even with rectangular Gaussian blocks, a situation including non-white Wishart matrices and some matrices encountered in MIMO systems.

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