Critical behavior of nonequilibrium models in short-time Monte Carlo simulations.
We analyze two alternative methods for determining the dynamic critical exponent z of the contact process and the Domany-Kinzel cellular automaton in Monte Carlo simulations. One method employs mixed initial conditions, as proposed for magnetic models [Phys. Lett. A 298, 325 (2002)]]; the other is based on the growth of the moment ratio m (t) = <rho2(t)>/<rho(t)>2 starting with all sites occupied. The methods provide reliable estimates for z using the short-time dynamics of the process. Estimates of nu|| are obtained using a method suggested by Grassberger.
da Silva
Roberto
R
Departamento de Informática Teórica, Instituto de Informática, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 90570-051, Porto Alegre, RS, Brazil. rdasilva@fisica.ufmg.br
Dickman
Ronald
R
Drugowich de Felício
J R
JR