Random hermitian matrices in an external field

Abstract

In this article, a model of random hermitian matrices is considered, in which the measure $\exp (-S)$ contains a general U(N)-invariant potential and an external source term: $S=N\tr(V(M)+MA)$. The generalization of known determinant formulae leads to compact expressions for the correlation functions of the energy levels. These expressions, exact at finite $N$, are potentially useful for asymptotic analysis.

10 pages, TeX, using phyzzx macros

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