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arXiv 1209.5683physics.soc-phcond-mat.stat-mechcs.SI
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信念在意见形成的非均衡模型中的作用

Role of conviction in nonequilibrium models of opinion formation

Nuno Crokidakis, Celia Anteneodo

摘要:

我们分析了一类离散意见模型在无序情况下的临界行为。在这个类中,每个代理人的意见采取离散值($\pm 1$或0),其时间演化由两个条款,一个代表代理人的互动和其他的信念或说服(自我互动)的程度。平均场的限制,每个代理人可以均匀地与任何其他,被认为是。无序引入到两种相互作用的强度中,具有淬火或退火的随机变量。在概率为$p$(1- $p$)的情况下,成对相互作用反映负(正)耦合,而确信度也遵循二元概率分布(考虑两个不同的离散概率分布)。数值模拟表明,一个非平衡的连续相变,从无序状态到一个状态,一个占主导地位的意见,发生在一个临界点$p_{c}$,这取决于分布的信念,过渡被破坏在某些情况下。我们还展示了如何的临界线,对于每个模型,是由更新方案(并行或顺序)以及由一种无序(淬火或退火)的影响。

英文摘要:

We analyze the critical behavior of a class of discrete opinion models in the presence of disorder. Within this class, each agent opinion takes a discrete value ($\pm 1$ or 0) and its time evolution is ruled by two terms, one representing agent-agent interactions and the other the degree of conviction or persuasion (a self-interaction). The mean-field limit, where each agent can interact evenly with any other, is considered. Disorder is introduced in the strength of both interactions, with either quenched or annealed random variables. With probability $p$ (1-$p$), a pairwise interaction reflects a negative (positive) coupling, while the degree of conviction also follows a binary probability distribution (two different discrete probability distributions are considered). Numerical simulations show that a non-equilibrium continuous phase transition, from a disordered state to a state with a prevailing opinion, occurs at a critical point $p_{c}$ that depends on the distribution of the convictions, the transition being spoiled in some cases. We also show how the critical line, for each model, is affected by the update scheme (either parallel or sequential) as well as by the kind of disorder (either quenched or annealed).

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