Nonintersecting paths with a staircase initial condition

Details Nonintersecting paths with a staircase initial condition Nonintersecting paths with a staircase initial condition

2011-05-02

arxiv.org/abs/1105.0388v2

Mathematics

Probability

34 pages, 9 figures; reference added, Theorem 2.1 extended, typos corrected

Scientific paper

We consider an ensemble of $N$ discrete nonintersecting paths starting from equidistant points and ending at consecutive integers. Our first result is an explicit formula for the correlation kernel that allows us to analyze the process as $N\to \infty$. In that limit we obtain a new general class of kernels describing the local correlations close to the equidistant starting points. As the distance between the starting points goes to infinity, the correlation kernel converges to that of a single random walker. As the distance to the starting line increases, however, the local correlations converge to the sine kernel. Thus, this class interpolates between the sine kernel and an ensemble of independent particles. We also compute the scaled simultaneous limit, with both the distance between particles and the distance to the starting line going to infinity, and obtain a process with number variance saturation, previously studied by Johansson.

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