Cube root fluctuations for the corner growth model associated to the exclusion process

Details Cube root fluctuations for the corner growth model associated to the exclusion process Cube root fluctuations for the corner growth model associated to the exclusion process

2006-03-13

arxiv.org/abs/math/0603306v1

Electronic Journal of Probability, Vol. 11(2006), pp. 1094-1132

Mathematics

Probability

41 pages, 4 figures

Scientific paper

We study the last-passage growth model on the planar integer lattice with exponential weights. With boundary conditions that represent the equilibrium exclusion process as seen from a particle right after its jump we prove that the variance of the last-passage time in a characteristic direction is of order t^{2/3}. With more general boundary conditions that include the rarefaction fan case we show that the last-passage time fluctuations are still of order t^{1/3}, and also that the transversal fluctuations of the maximal path have order t^{2/3}. We adapt and then build on a recent study of Hammersley's process by Cator and Groeneboom, and also utilize the competition interface introduced by Ferrari, Martin and Pimentel. The arguments are entirely probabilistic, and no use is made of the combinatorics of Young tableaux or methods of asymptotic analysis.

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