On the Consensus Threshold for the Opinion Dynamics of Krause-Hegselmann

Details On the Consensus Threshold for the Opinion Dynamics of Krause-Hegselmann On the Consensus Threshold for the Opinion Dynamics of Krause-Hegselmann

2004-08-30

arxiv.org/abs/cond-mat/0408648v1

Physics

Condensed Matter

Statistical Mechanics

15 pages, 7 figures, to appear in International Journal of Modern Physics C 16, issue 2 (2005)

Scientific paper

10.1142/S0129183105007078

In the consensus model of Krause-Hegselmann, opinions are real numbers between 0 and 1 and two agents are compatible if the difference of their opinions is smaller than the confidence bound parameter \epsilon. A randomly chosen agent takes the average of the opinions of all neighbouring agents which are compatible with it. We propose a conjecture, based on numerical evidence, on the value of the consensus threshold \epsilon_c of this model. We claim that \epsilon_c can take only two possible values, depending on the behaviour of the average degree d of the graph representing the social relationships, when the population N goes to infinity: if d diverges when N goes to infinity, \epsilon_c equals the consensus threshold \epsilon_i ~ 0.2 on the complete graph; if instead d stays finite when N goes to infinity, \epsilon_c=1/2 as for the model of Deffuant et al.

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