title: Block voter model: phase diagram and critical behavior.
abstract: We introduce and study the block voter model with noise on two-dimensional square lattices using Monte Carlo simulations and finite-size scaling techniques. The model is defined by an outflow dynamics where a central set of N(PCS) spins, here denoted by persuasive cluster spins (PCS), tries to influence the opinion of their neighboring counterparts. We consider the collective behavior of the entire system with varying PCS size. When N(PCS)>2, the system exhibits an order-disorder phase transition at a critical noise parameter q(c) which is a monotonically increasing function of the size of the persuasive cluster. We conclude that a larger PCS has more power of persuasion, when compared to a smaller one. It also seems that the resulting critical behavior is Ising-like independent of the range of interaction.
authors.affiliation: Departamento de Fisica, Universidade Federal de Pernambuco, Recife-PE, Brazil. cesampaiof@gmail.com
authors.forename: C I N
authors.initials: CI
authors.lastname: Sampaio-Filho
authors.forename: F G B
authors.initials: FG
authors.lastname: Moreira