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arXiv 1601.04739physics.soc-phnlin.AO
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从社会动力学模型看平衡的出现

Emergence of Balance from a model of Social Dynamics

Ikemefuna Agbanusi, Jared C. Bronski

摘要:

我们提出了一个网络上的社会动力学模型。在这个模型中,每个参与者都在某个问题上持有一个立场,参与者及其观点与图的顶点相关联,此外,参与者还持有彼此的观点,这些观点与图中的边相关联。允许这些量根据自然自由能的梯度流而演化。我们表明,对于一个小的传播意见的模型收敛到一个共识状态,所有的演员都持有相同的立场。对于一个更大的意见分歧,有一个相变,标志着第二个稳定状态的诞生:除了共识状态,还有第二个极化或党派状态。这个状态,当它存在时,被证明是全局能量最小化,与共识状态是局部能量最小化。我们得到一个支持这一点的能量不等式。有趣的是,我们发现的所有稳态,除了一致态,要么是平衡的(在海德的意义上),要么是完全不平衡的状态,其中所有三角形都是不平衡的。毫不奇怪,后一种解决方案总是不稳定的。

英文摘要:

We propose a model for social dynamics on a network. In this model each actor holds a position on some issue, actors and their opinions being associated to vertices of the graph, and, additionally, the actors hold opinions of one another, with these opinions being associated to edges in the graph. These quantities are allowed to evolve according to the gradient flow of a natural free energy. We show that for a small spread in opinions the model converges to a consensus state, where all actors hold the same position. For a larger spread in opinion there is a phase transition marked by the birth of a second stable state: in addition to the consensus state there is a second polarized or partisan state. This state, when it exists, is conjectured to be global energy minimizer, with the consensus state being a local energy minimizer. We derive an energy inequality which supports this. Interestingly, all of the steady states we find, with the exception of the consensus state, are either balanced (in the sense of Heider) or are completely unbalanced states where all triangles are unbalanced. The latter solutions are, not surprisingly, always unstable.

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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