Abstract
In the framework of the three-party constrained voter model, where voters of two radical parties (A and B) interact with “centrists” (C and C ζ ), we study the competition between a persuasive majority and a committed minority. In this model, A’s and B’s are incompatible voters that can convince centrists or be swayed by them. Here, radical voters are more persuasive than centrists, whose sub-population comprises susceptible agents C and a fraction ζ of centrist zealots C ζ . Whereas C’s may adopt the opinions A and B with respective rates 1+δ A and 1+δ B (with δ A ≥δ B >0), C ζ ’s are committed individuals that always remain centrists. Furthermore, A and B voters can become (susceptible) centrists C with a rate 1. The resulting competition between commitment and persuasion is studied in the mean field limit and for a finite population on a complete graph. At mean field level, there is a continuous transition from a coexistence phase when ζ<Δ c =δ A /(1+δ A ) to a phase where centrism prevails when ζ≥Δ c . In a finite population of size N, demographic fluctuations lead to centrism consensus and the dynamics is characterized by the mean consensus time τ. Because of the competition between commitment and persuasion, here consensus is reached much slower (ζ<Δ c ) or faster (ζ≥Δ c ) than in the absence of zealots (when τ∼N). In fact, when ζ<Δ c and there is an initial minority of centrists, the mean consensus time grows as τ∼N −1/2 e Nγ, with N≫1 and . The dynamics is thus characterized by a metastable state where the most persuasive voters and centrists coexist when δ A >δ B , whereas all species coexist when δ A =δ B . When ζ≥Δ c and the initial density of centrists is low, one finds τ∼lnN (when N≫1). Our analytical findings are corroborated by stochastic simulations.
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Notes
These models are equivalent on one-dimensional lattices, but not in higher dimensions where the Ising-Glauber model follows a majority rule, whereas the VM evolves according to a a proportional rule. As a consequence, while there is a surface tension in the two-dimensional Ising-Glauber model this is not the case for the VM, see [10, 41] and references therein.
It has also been shown that a class of models with voter-like dynamics and describing cooperation dilemmas are characterized by anomalous metastability on scale-free networks, with the mean consensus time and exit probability exhibiting a stretched exponential dependence on the population size and an exponent depending non-trivially on the degree distribution [53].
One slight difference with the generic result given in Ref. [68] lies in the fact that here the absorbing boundary is at z=1−ζ. Furthermore, in the final result (26) we have chosen the same timescale as in Sect. 6.1.1 and divided (22) by N. This allows a direct comparison with the results of the Fokker-Planck treatment and differs by a factor N −1 from that of [66–71].
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The author is grateful to Sid Redner for useful discussions and insightful comments on a preliminary version of the manuscript.
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Mobilia, M. Commitment Versus Persuasion in the Three-Party Constrained Voter Model. J Stat Phys 151, 69–91 (2013). https://doi.org/10.1007/s10955-012-0656-x
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DOI: https://doi.org/10.1007/s10955-012-0656-x