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arXiv 0710.4910physics.soc-phcond-mat.stat-mech
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协同进化动力学中的类属吸收跃迁

Generic Absorbing Transition in Coevolution Dynamics

F. Vazquez, V. M. Eguiluz, M. San Miguel

摘要:

我们研究了一个根据节点状态演化的网络上的协同进化投票模型。在单次更新中,状态相反的节点之间的链路以概率$p$重新布线,而其中一个节点以概率$1-p$采用其邻居的状态。平均场近似揭示了在临界值$p_c=\frac{μ-2}{μ-1}$处从活性相到冻结相的吸收跃迁,该临界值仅取决于网络的平均度$μ$。接近最终状态的特征在于在临界点处发散为$τ\sim |p_c-p|^{-1}$的时间尺度。我们发现,活跃和冻结阶段分别对应于一个连接和一个破碎的网络。我们表明,在有限大小的系统中的过渡可以被看作是一个等价的随机行走在临界重新布线率$p_c$的轨迹的突然变化,突出的事实是,过渡背后的机制是一个竞争的速度之间的网络和节点的状态演变。

英文摘要:

We study a coevolution voter model on a network that evolves according to the state of the nodes. In a single update, a link between opposite-state nodes is rewired with probability $p$, while with probability $1-p$ one of the nodes takes its neighbor's state. A mean-field approximation reveals an absorbing transition from an active to a frozen phase at a critical value $p_c=\frac{μ-2}{μ-1}$ that only depends on the average degree $μ$ of the network. The approach to the final state is characterized by a time scale that diverges at the critical point as $τ\sim |p_c-p|^{-1}$. We find that the active and frozen phases correspond to a connected and a fragmented network respectively. We show that the transition in finite-size systems can be seen as the sudden change in the trajectory of an equivalent random walk at the critical rewiring rate $p_c$, highlighting the fact that the mechanism behind the transition is a competition between the rates at which the network and the state of the nodes evolve.

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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