Vicious walkers and random contraction matrices

Details Vicious walkers and random contraction matrices Vicious walkers and random contraction matrices

2007-05-07

arxiv.org/abs/0705.0984v3

Mathematics

Combinatorics

13 pages, 1 figures

Scientific paper

The ensemble $\CUE^{(q)}$ of truncated random unitary matrices is a deformation of the usual Circular Unitary Ensemble depending on a discrete non-negative parameter $q.$ $\CUE^{(q)}$ is an exactly solved model of random contraction matrices originally introduced in the context of scattering theory. In this article, we exhibit a connection between $\CUE^{(q)}$ and Fisher's random-turns vicious walker model from statistical mechanics. In particular, we show that the moment generating function of the trace of a random matrix from $\CUE^{(q)}$ is a generating series for the partition function of Fisher's model, when the walkers are assumed to represent mutually attracting particles.

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