A Fredholm Determinant Representation in ASEP

Details A Fredholm Determinant Representation in ASEP A Fredholm Determinant Representation in ASEP

2008-04-09

arxiv.org/abs/0804.1379v3

Journal of Statistical Physics 132 (2008), 291-300.

Mathematics

Probability

12 Pages. Version 3 includes a scaling conjecture

Scientific paper

10.1007/s10955-008-9562-7

In previous work the authors found integral formulas for probabilities in the asymmetric simple exclusion process (ASEP) on the integer lattice. The dynamics are uniquely determined once the initial state is specified. In this note we restrict our attention to the case of step initial condition with particles at the positive integers, and consider the distribution function for the m'th particle from the left. In the previous work an infinite series of multiple integrals was derived for this distribution. In this note we show that the series can be summed to give a single integral whose integrand involves a Fredholm determinant. We use this determinant representation to derive (non-rigorously, at this writing) a scaling limit.

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