title: Pair contact process with a particle source.
abstract: We study the phase diagram and critical behavior of the one-dimensional pair contact process (PCP) with a particle source using cluster approximations and extensive simulations. The source creates isolated particles only, not pairs, and so couples not to the order parameter (the pair density) but to a nonordering field, whose state influences the evolution of the order parameter. While the critical point p(c) shows a singular dependence on the source intensity, the critical exponents appear to be unaffected by the presence of the source, except possibly for a small change in beta. In the course of our paper, we obtain high-precision values for the critical exponents of the standard PCP, confirming directed-percolationlike scaling.
authors.affiliation: Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Caixa Postal 702, 30161-970, Belo Horizonte - MG, Brasil. dickman@fisica.ufmg.br
authors.forename: Ronald
authors.initials: R
authors.lastname: Dickman
authors.forename: Wilson R M
authors.initials: WR
authors.lastname: Rabêlo
authors.forename: Géza
authors.initials: G
authors.lastname: Odor