Multiple Meixner-Pollaczek polynomials and the six-vertex model

Details Multiple Meixner-Pollaczek polynomials and the six-vertex model Multiple Meixner-Pollaczek polynomials and the six-vertex model

2011-01-15

arxiv.org/abs/1101.2982v2

Mathematics

Classical Analysis and ODEs

32 pages, 4 figures. References added

Scientific paper

We study multiple orthogonal polynomials of Meixner-Pollaczek type with respect to a symmetric system of two orthogonality measures. Our main result is that the limiting distribution of the zeros of these polynomials is one component of the solution to a constrained vector equilibrium problem. We also provide a Rodrigues formula and closed expressions for the recurrence coefficients. The proof of the main result follows from a connection with the eigenvalues of block Toeplitz matrices, for which we provide some general results of independent interest. The motivation for this paper is the study of a model in statistical mechanics, the so-called six-vertex model with domain wall boundary conditions, in a particular regime known as the free fermion line. We show how the multiple Meixner-Pollaczek polynomials arise in an inhomogeneous version of this model.

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