Does hardcore interaction change absorbing type critical phenomena?

Details Does hardcore interaction change absorbing type critical phenomena? Does hardcore interaction change absorbing type critical phenomena?

2000-02-15

arxiv.org/abs/cond-mat/0002214v1

Physical Review Letters 85 (8), 1682-1685 (2000)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.85.1682

It has been generally believed that hardcore interaction is irrelevant to absorbing type critical phenomena because the particle density is so low near an absorbing phase transition. We study the effect of hardcore interaction on the N species branching annihilating random walks with two offspring and report that hardcore interaction drastically changes the absorbing type critical phenomena in a nontrivial way. Through Langevin equation type approach, we predict analytically the values of the scaling exponents, $\nu_{\perp} = 2, z = 2, \alpha = 1/2, \beta = 2$ in one dimension for all N > 1. Direct numerical simulations confirm our prediction. When the diffusion coefficients for different species are not identical, $\nu_{\perp}$ and $\beta$ vary continuously with the ratios between the coefficients.

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