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arXiv 1403.2199cond-mat.stat-mech
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具有域大小依赖动态的观点动力学模型中退出概率的泛特征

Universal features of exit probability in opinion dynamics models with domain size dependent dynamics

Parna Roy, Soham Biswas, Parongama Sen

摘要:

我们研究了一维二元观点动力学模型的退出概率,其中主体的观点状态(用$\pm 1$表示)由依赖于其相邻域大小的动力学规则决定.在所有这些模型中,我们发现退出概率在热力学极限下表现为一个阶跃函数。在大小为$L$的有限系统中,作为一种意见的初始分数$x$的函数的退出概率$E(x)$由具有普适值$ν= 2.5 \pm 0.03$的$E(x) = f[(x-x_c)L^{1/ν}]$给出。标度函数的形式也是通用的:$f(y) = [\tanh(λy +c) +1]/2$,其中发现$λ$依赖于特定的动力学。研究了$λ$随模型参数的变化规律。只有当动力学规则区分$\pm 1$状态时,$c$才是非零的;在这种情况下,与理论估计的比较显示出非常好的一致性。

英文摘要:

We study the exit probability for several binary opinion dynamics models in one dimension in which the opinion state (represented by $\pm 1$) of an agent is determined by dynamical rules dependent on the size of its neighbouring domains. In all these models, we find the exit probability behaves like a step function in the thermodynamic limit. In a finite system of size $L$, the exit probability $E(x)$ as a function of the initial fraction $x$ of one type of opinion is given by $E(x) = f[(x-x_c)L^{1/ν}]$ with a universal value of $ν= 2.5 \pm 0.03$. The form of the scaling function is also universal: $f(y) = [\tanh(λy +c) +1]/2$, where $λ$ is found to be dependent on the particular dynamics. The variation of $λ$ against the parameters of the models is studied. $c$ is non-zero only when the dynamical rule distinguishes between $\pm 1$ states; comparison with theoretical estimates in this case shows very good agreement.

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