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arXiv 1208.0187math-phcond-mat.stat-mechmath.MP
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独立Ginibre矩阵乘积的通用微观关联函数

Universal microscopic correlation functions for products of independent Ginibre matrices

G. Akemann, Z. Burda

摘要:

我们考虑n个复杂的非厄米特独立随机矩阵的乘积,每个矩阵的大小为N × N,具有独立同分布的高斯项(Ginibre矩阵)。联合概率分布的产品矩阵的复杂的特征值被发现是由一个决定性的点过程中的情况下,一个单一的Ginibre矩阵,但更复杂的权重由一个梅杰G-函数取决于n。利用正交多项式的方法,我们精确地计算了有限N和固定n下的所有特征值密度关联函数。它们由我们明确构造的相应核的行列式给出。在固定n的大N极限下,我们首先确定了在光谱的边缘和体中的微观关联函数。展开后,它们与n=1的Ginibre系综相同,因此是普适的。相反,我们发现在原点的微观相关性对于每个n>1都不同,并且将n=2的复平面中的已知贝塞尔定律推广到一个新的超几何核0_F_n-1。

英文摘要:

We consider the product of n complex non-Hermitian, independent random matrices, each of size NxN with independent identically distributed Gaussian entries (Ginibre matrices). The joint probability distribution of the complex eigenvalues of the product matrix is found to be given by a determinantal point process as in the case of a single Ginibre matrix, but with a more complicated weight given by a Meijer G-function depending on n. Using the method of orthogonal polynomials we compute all eigenvalue density correlation functions exactly for finite N and fixed n. They are given by the determinant of the corresponding kernel which we construct explicitly. In the large-N limit at fixed n we first determine the microscopic correlation functions in the bulk and at the edge of the spectrum. After unfolding they are identical to that of the Ginibre ensemble with n=1 and thus universal. In contrast the microscopic correlations we find at the origin differ for each n>1 and generalise the known Bessel-law in the complex plane for n=2 to a new hypergeometric kernel 0_F_n-1.

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