Phase transitions in social impact models of opinion formation

Details Phase transitions in social impact models of opinion formation Phase transitions in social impact models of opinion formation

2000-04-03

arxiv.org/abs/cond-mat/0004026v1

Physics

Condensed Matter

Statistical Mechanics

15 pages, 4 figures, submitted for publication in Physica A

Scientific paper

10.1016/S0378-4371(00)00282-X

We study phase transitions in models of opinion formation which are based on the social impact theory. Two different models are discussed: (i) a cellular--automata based model of a finite group with a strong leader where persons can change their opinions but not their spatial positions, and (ii) a model with persons treated as active Brownian particles interacting via a communication field. In the first model, two stable phases are possible: a cluster around the leader, and a state of social unification. The transition into the second state occurs for a large leader strength and/or for a high level of social noise. In the second model, we find three stable phases, which correspond either to a ``paramagnetic'' phase (for high noise and strong diffusion), a ``ferromagnetic'' phase (for small nose and weak diffusion), or a phase with spatially separated ``domains'' (for intermediate conditions).

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