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arXiv 0910.5541math.PR
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实Wishart矩阵的亏格展开

Genus expansion for real Wishart matrices

C. Emily I. Redelmeier

摘要:

利用类似于复随机矩阵亏格展开的欧拉示性数展开,给出了几个实复合Wishart矩阵的矩和累积量的精确公式.我们考虑它们在大矩阵极限中的渐近值:与亏格展开一样,在大矩阵极限中幸存的项是那些具有最大欧拉示性数的项,即球体或球体集合。这种拓扑结构的动机的代数式的矩和累积量的对称群。我们研究的组合性质区分领导秩序的条款。通过考虑高阶累积量,我们给出了期望值附近渐近分布的中心极限型定理。

英文摘要:

We present an exact formula for moments and cumulants of several real compound Wishart matrices in terms of an Euler characteristic expansion, similar to the genus expansion for complex random matrices. We consider their asymptotic values in the large matrix limit: as in a genus expansion, the terms which survive in the large matrix limit are those with the greatest Euler characteristic, that is, either spheres or collections of spheres. This topological construction motivates an algebraic expression for the moments and cumulants in terms of the symmetric group. We examine the combinatorial properties distinguishing the leading order terms. By considering higher cumulants, we give a central limit-type theorem for the asymptotic distribution around the expected value.

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