Berlin 2008 – wissenschaftliches Programm
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AKSOE: Arbeitskreis Physik sozio-ökonomischer Systeme
AKSOE 15: Social-, Information-, and Production Networks II
AKSOE 15.3: Vortrag
Donnerstag, 28. Februar 2008, 11:15–11:45, EW 203
Effects of noise and confidence thresholds in metric Axelrod dynamics of social influence — •Tobias Galla1,2 and Luca De Sanctis2 — 1The University of Manchester, School of Physics and Astronomy, Schuster Building, Manchester M13 9PL, UK — 2The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy
We study the effects of bounded confidence thresholds and of interaction and external noise on Axelrod's model of social influence. Our study is based on a combination of numerical simulations and an integration of the mean-field Master equation describing the system in the thermodynamic limit. We find that interaction thresholds affect the system only quantitatively, but that they do not alter the basic phase structure. The known crossover between an ordered and a disordered state in finite systems subject to external noise persists in models with general confidence threshold. Interaction noise here facilitates the dynamics and reduces relaxation times. We also study Axelrod systems with metric features, and point out similarities and differences compared to models with nominal features. Metric features are used to demonstrate that a small group of extremists can have a significant impact on the opinion dynamics of a population of Axelrod agents.