Abstract
We study the noncolliding random walk (RW), which is a particle system of one-dimensional, simple and symmetric RWs starting from distinct even sites and conditioned never to collide with each other. When the number of particles is finite, \(N < \infty \), this discrete process is constructed as an \(h\)-transform of absorbing RW in the \(N\)-dimensional Weyl chamber. We consider Fujita’s polynomial martingales of RW with time-dependent coefficients and express them by introducing a complex Markov process. It is a complexification of RW, in which independent increments of its imaginary part are in the hyperbolic secant distribution, and it gives a discrete-time conformal martingale. The \(h\)-transform is represented by a determinant of the matrix, whose entries are all polynomial martingales. From this determinantal-martingale representation (DMR) of the process, we prove that the noncolliding RW is determinantal for any initial configuration with \(N < \infty \), and determine the correlation kernel as a function of initial configuration. We show that noncolliding RWs started at infinite-particle configurations having equidistant spacing are well-defined as determinantal processes and give DMRs for them. Tracing the relaxation phenomena shown by these infinite-particle systems, we obtain a family of equilibrium processes parameterized by particle density, which are determinantal with the discrete analogues of the extended sine-kernel of Dyson’s Brownian motion model with \(\beta =2\). Following Donsker’s invariance principle, convergence of noncolliding RWs to the Dyson model is also discussed.
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Acknowledgments
The present author would like to thank T. Shirai, H. Osada, H. Tanemura, and S. Esaki for useful discussions. This work is supported in part by the Grant-in-Aid for Scientific Research (C) (Nos. 21540397 and 26400405) of Japan Society for the Promotion of Science.
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Katori, M. Determinantal Martingales and Correlations of Noncolliding Random Walks. J Stat Phys 159, 21–42 (2015). https://doi.org/10.1007/s10955-014-1179-4
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DOI: https://doi.org/10.1007/s10955-014-1179-4