Eur. Phys. J. B 35, 505-511 (2003)
https://doi.org/10.1140/epjb/e2003-00303-4

Mean-field solution of the parity-conserving kinetic phase transition in one dimension

¹ Department of Physics, Clarkson University, Postdam, New York 13699-5820 USA
² Instituto de Física Teórica y Computacional Carlos I and Departamento de Electromagnetismo y Física de la Materia, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain

Corresponding author: ^a mamunoz@onsager.ugr.es

Received: 19 May 2003
Published online: 24 October 2003

Abstract

A two-offspring branching annihilating random walk model, with finite reaction rates, is studied in one-dimension. The model exhibits a transition from an active to an absorbing phase, expected to belong to the DP2 universality class embracing systems that possess two symmetric absorbing states, which in one-dimensional systems, is in many cases equivalent to parity conservation. The phase transition is studied analytically through a mean-field like modification of the so-called parity interval method. The original method of parity intervals allows for an exact analysis of the diffusion-controlled limit of infinite reaction rate, where there is no active phase and hence no phase transition. For finite rates, we obtain a surprisingly good description of the transition which compares favorably with the outcome of Monte Carlo simulations. This provides one of the first analytical attempts to deal with the broadly studied DP2 universality class.