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arXiv 1606.04058cond-mat.stat-mechphysics.soc-ph
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意见形成模型中噪声诱导的吸收相变

Noise-induced absorbing phase transition in a model of opinion formation

Allan R. Vieira, Nuno Crokidakis

摘要:

在这项工作中,我们研究了一个三态($+1$,$-1$,$0$)意见模型中存在的噪声和无序。我们考虑成对竞争相互作用,其中一部分$p$是负的(无序)。此外,存在噪声$q$,其表示个体自发地将其意见改变到中性状态的概率。我们的目的是研究如何增加/减少的中性代理的分数影响系统的临界行为和意见的演变。我们推导出模型的序参量的解析表达式,以及每个意见的固定分数,我们表明,有不同的相变。一种是通常的铁-顺磁跃迁,属于伊辛普适类。此外,还存在着顺反子吸收和铁吸收跃迁,呈现出定向渗流普适类。我们的结果是补充数值模拟。

英文摘要:

In this work we study a 3-state ($+1$, $-1$, $0$) opinion model in the presence of noise and disorder. We consider pairwise competitive interactions, with a fraction $p$ of those interactions being negative (disorder). Moreover, there is a noise $q$ that represents the probability of an individual spontaneously change his opinion to the neutral state. Our aim is to study how the increase/decrease of the fraction of neutral agents affects the critical behavior of the system and the evolution of opinions. We derive analytical expressions for the order parameter of the model, as well as for the stationary fraction of each opinion, and we show that there are distinct phase transitions. One is the usual ferro-paramagnetic transition, that is in the Ising universality class. In addition, there are para-absorbing and ferro-absorbing transitions, presenting the directed percolation universality class. Our results are complemented by numerical simulations.

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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