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arXiv 0705.2555math-phcond-mat.stat-mechhep-thmath.MP
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Dyson行列式积分定理的推广

A Generalisation of Dyson's Integration Theorem for Determinants

Gernot Akemann, Leonid Shifrin

摘要:

Dyson积分定理广泛应用于随机矩阵理论中特征值关联函数的计算。在这里,我们专注于行列式定理的变体,与Dyson指数beta = 2的酉系综相关。我们推导出一个公式减少的(n-k)倍积分的n × n行列式的核的两组任意函数的大小为k × k的行列式。我们的推广允许不正交或双正交的集成措施的功能集。在正交函数的特殊情况下,Dyson定理被恢复。

英文摘要:

Dyson's integration theorem is widely used in the computation of eigenvalue correlation functions in Random Matrix Theory. Here we focus on the variant of the theorem for determinants, relevant for the unitary ensembles with Dyson index beta = 2. We derive a formula reducing the (n-k)-fold integral of an n x n determinant of a kernel of two sets of arbitrary functions to a determinant of size k x k. Our generalisation allows for sets of functions that are not orthogonal or bi-orthogonal with respect to the integration measure. In the special case of orthogonal functions Dyson's theorem is recovered.

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