Averages of Products and Ratios of Characteristic Polynomials in Polynomial Ensembles

Gernot Akemann*, Eugene Strahov, Tim R. Würfel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Polynomial ensembles are a sub-class of probability measures within determinantal point processes. Examples include products of independent random matrices, with applications to Lyapunov exponents, and random matrices with an external field, that may serve as schematic models of quantum field theories with temperature. We first analyse expectation values of ratios of an equal number of characteristic polynomials in general polynomial ensembles. Using Schur polynomials, we show that polynomial ensembles constitute Giambelli compatible point processes, leading to a determinant formula for such ratios as in classical ensembles of random matrices. In the second part, we introduce invertible polynomial ensembles given, e.g. by random matrices with an external field. Expectation values of arbitrary ratios of characteristic polynomials are expressed in terms of multiple contour integrals. This generalises previous findings by Fyodorov, Grela, and Strahov. for a single ratio in the context of eigenvector statistics in the complex Ginibre ensemble.

Original languageAmerican English
Pages (from-to)3973-4002
Number of pages30
JournalAnnales Henri Poincare
Issue number12
StatePublished - Dec 2020

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