A Generalisation of Dyson's Integration Theorem for Determinants

Details A Generalisation of Dyson's Integration Theorem for Determinants A Generalisation of Dyson's Integration Theorem for Determinants

2007-05-17

arxiv.org/abs/0705.2555v3

J.Phys.A40:F785-F792,2007

Physics

Mathematical Physics

7 pages, Latex. v2: typos corrected + reference added. v3: degenerate case added, to be published in J.Phys.A FTC

Scientific paper

10.1088/1751-8113/40/32/F01

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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