Epidemic analysis of the second-order transition in the Ziff-Gulari-Barshad surface-reaction model

We study the dynamic behavior of the Ziff-Gulari-Barshad irreversible surface-reaction model around its kinetic second-order phase transition, using both epidemic and poisoning-time analyses. We find that the critical point is given by p₁=0.3873682±0.0000015, which is lower than the previously determined value. We also obtain precise values of the dynamical critical exponents z, δ, and η, which provide further numerical evidence that this transition is in the same universality class as directed percolation.