A model for opinion dynamics (Model I) has been recently introduced in which the binary opinions of the individuals are determined according to the size of their neighboring domains (population having the same opinion). The coarsening dynamics of the equivalent Ising model shows power law behavior and has been found to belong to a new universality class with the dynamic exponent $z=1.0 \pm 0.01$ and persistence exponent $θ\simeq 0.235$ in one dimension. The critical behavior has been found to be robust for a large variety of annealed disorder that has been studied. Further, by mapping Model I to a system of random walkers in one dimension with a tendency to walk towards their nearest neighbour with probability $ε$, we find that for any $ε> 0.5$, the Model I dynamical behaviour is prevalent at long times.
We show using scaling arguments and Monte Carlo simulations that a class of binary interacting models of opinion evolution belong to the Ising universality class in presence of an annealed noise term of finite amplitude. While the zero noise limit is known to show an active-absorbing transition, addition of annealed noise induces a continuous order-disorder transition with Ising universality class in the infinite-range (mean field) limit of the models.
本文研究了正方格子LCCC模型(Lallouache et al. in Phys. Rev. E 82 056112(2010)中提出的一种观点交换动力学模型)中几何团簇随信念和影响参数变化的逾渗转变.所述聚类包括具有大于或等于意见的预定阈值(Ω)的意见值的相邻站点。该转变点与Lallouache等人发现的序参量(平均意见值)的转变点不同。虽然转变点随意见阈值的变化而变化,但从最大团簇尺寸、团簇尺寸分布和Binder累积量的数据崩溃中获得的逾渗转变的临界指数保持不变。的指数也是独立的信念和影响参数的值,表明这种过渡的鲁棒性。这些指数与任何其他已知的渗透指数(例如静态伊辛、动态伊辛、标准渗透)不匹配,因此表征了LCCC模型属于单独的普适类。
本文研究了意见依赖网络或Stauffer-Hohnisch-Pittnauer网络上具有上下对称性和噪声参数$q$的M. J. Oliveira $1992$的多数投票模型.通过MonteCarlo模拟和有限尺寸标度关系,得到了临界指数$β/ν$、$γ/ν$和$1/ν$以及点$q_{c}$和$U^*$.经过大量的模拟,我们得到了$β/ν=0.230(3)$,$γ/ν=0.535(2)$和$1/ν=0.475(8)$。临界噪声参数和Binder累积量的计算值分别为$q_{c}=0.166(3)$和$U^*=0.288(3)$。在误差条内,指数服从关系$2β/ν+γ/ν=1$,这里给出的结果表明,多数票模型与Stauffer-Hohnisch-Pittnauer网络上的均衡伊辛模型属于不同的普适类,但与其他一些网络上的多数票模型属于同一类。
Traditional models of opinion dynamics, in which the nodes of a network change their opinions based on their interactions with neighboring nodes, consider how opinions evolve either on time-independent networks or on temporal networks with edges that follow Poisson statistics. Most such models are Markovian. However, in many real-life networks, interactions between individuals (and hence the edges of a network) follow non-Poisson processes and thus yield dynamics with memory-dependent effects. In this paper, we model opinion dynamics in which the entities of a temporal network interact and cha…
We investigate the opinion evolution of outflow dynamics based on the Sznajd model on a complete graph involving contrarian and independence behaviors. We consider a group of four spins representing the social agents with the following scenarios: (1) scenario two-two with contrarian agents or independence agents and (2) scenario three-one with contrarian or independence agents. All of them undergo a second-order phase transition according to our simulation. The critical point decreases exponentially as $λ$ and $f$ increases, where $λ$ and $f$ are contrarian and flexibility factors, respectivel…
Inferring the microscopic mechanisms of opinion dynamics using a kinetic Ising model
Sorbonne Université(索邦大学);CNRS(法国国家科学研究中心);LIP6(LIP6实验室);Complex Systems Institute of Paris île-de-France (ISC-PIF, UAR3611)(巴黎-法兰西岛复杂系统研究所);Centre d’Analyse et de Mathématique Sociales (CAMS, UMR8557)(社会分析与数学中心);Université Paris-Saclay(巴黎萨克雷大学);CEA(法国原子能和替代能源委员会)
A model for the joint evolution of opinions and how much the agents trust each other is presented. The model is built using the framework of the Continuous Opinions and Discrete Actions (CODA) model. Instead of a fixed probability that the other agents will decide in the favor of the best choice, each agent considers that other agents might be one one of two types: trustworthy or useless. Trustworthy agents are considered more likely to be right than wrong, while the opposite holds for useless ones. Together with the opinion about the discussed issue, each agent also updates that probability f…
The same basic differential equation model has been adapted for time-dependent conversions of members of a population among different states. The conversion model has been applied in different contexts such as epidemiological infections, the Bass model for the diffusion of innovations, and the ideodynamic model for public opinion. For example, the ideodynamic version of the model predicts changes in public opinions in response to persuasive messages extending back to an indefinite past. All messages are measured with error, and this chapter discusses how errors in message measurements disappea…
We study the contrarian voter model for opinion formation in a society under the influence of an external oscillating propaganda and stochastic noise. Each agent of the population can hold one of two possible opinions on a given issue --against or in favor, and interacts with its neighbors following either an imitation dynamics (voter behavior) or an anti-alignment dynamics (contrarian behavior): each agent adopts the opinion of a random neighbor with a time-dependent probability $p(t)$, or takes the opposite opinion with probability $1-p(t)$. The imitation probability $p(t)$ is controlled by …