arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.04087physics.soc-phcond-mat.stat-mech
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平均场噪声选民模型中的狂热者

Zealots in the mean-field noisy voter model

Nagi Khalil, Maxi San Miguel, Raul Toral

摘要:

在平均场水平上,从理论上和数值上研究了狂热者对噪声选民模型的影响。噪声投票者模型是对投票者模型的修改,其包括用于状态之间的转换的第二机制:除了原始的羊群过程之外,投票者可以因为内在的、噪声的起源源而改变其状态。通过增加噪声对羊群效应的重要性,系统表现出从准共识状态(其中大多数投票者共享相同的意见)到共存状态的有限大小相变。在引入一些狂热分子或具有固定观点的选民后,后一种情况可能会发生重大变化。我们通过对一个完全连接的选民网络进行系统的数值和分析研究来揭示新的情况,但允许不同的选民直接受到不同狂热者的影响。我们表明,这个一般的系统是相当于一个系统的选民没有狂热者,但他们的参数特征羊群和嘈杂的动态异质值。我们发现我们的分析和数值结果之间的良好协议。在投票者模型中,噪声和羊群/狂热行为一起作用,产生了两种机制单独作用的情况下的不平凡的混合:它代表了一种情况,即全局-局部(噪声-羊群)竞争与对称性破缺(狂热者)相耦合。一般来说,狂热会增强系统的有效噪声,这可能会破坏原始的准共识状态,并可能导致对大多数狂热者意见的偏见,从而打破系统的对称性并产生新的相位。

英文摘要:

The influence of zealots on the noisy voter model is studied theoretically and numerically at the mean-field level. The noisy voter model is a modification of the voter model that includes a second mechanism for transitions between states: apart from the original herding processes, voters may change their states because of an intrinsic, noisy in origin source. By increasing the importance of the noise with respect to the herding, the system exhibits a finite-size phase transition from a quasi-consensus state, where most of the voters share the same opinion, to a one with coexistence. Upon introducing some zealots, or voters with fixed opinion, the latter scenario may change significantly. We unveil the new situations by carrying out a systematic numerical and analytical study of a fully connected network for voters, but allowing different voters to be directly influenced by different zealots. We show that this general system is equivalent to a system of voters without zealots, but with heterogeneous values of their parameters characterizing herding and noisy dynamics. We find excellent agreement between our analytical and numerical results. Noise and herding/zealotry acting together in the voter model yields not a trivial mixture of the scenarios with the two mechanisms acting alone: it represents a situation where the global-local (noise-herding) competitions is coupled to a symmetry breaking (zealots). In general, the zealotry enhances the effective noise of the system, which may destroy the original quasi--consensus state, and can introduce a bias towards the opinion of the majority of zealots, hence breaking the symmetry of the system and giving rise to new phases ...

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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