arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.04779math.PR
收藏

激活随机游走的临界密度始终小于1

The Critical Density for Activated Random Walks is always less than 1

Amine Asselah, Nicolas Forien, Alexandre Gaudillière

AI总结:

本文证明了激活随机游走在任意维度和任意休眠率下,其相变临界密度均小于1,并给出了小λ和大λ情形下临界密度的上界。

摘要:

激活随机游走(Activated Random Walks)是定义在任意维度 $d\geqslant 1$ 的整数格 $\mathbb{Z}^d$ 上的一种相互作用粒子系统,其中粒子可以处于两种状态之一:活跃态或冻结态。每个活跃粒子在参数为 $λ$ 的指数分布时间内执行连续时间简单随机游走,之后它保持静止并进入冻结态,直到另一个活跃粒子与其处于同一位置,并使其瞬间恢复活跃。已知该模型存在相变,我们证明了控制相变的临界密度在任意维度和任意休眠率 $λ$ 取值下都小于1。我们分别给出了小 $λ$ 和大 $λ$ 两种情形下临界密度的上界。

英文摘要:

Activated Random Walks, on $\mathbb{Z}^d$ for any $d\geqslant 1$, is an interacting particle system, where particles can be in either of two states: active or frozen. Each active particle performs a continuous-time simple random walk during an exponential time of parameter $λ$, after which it stays still in the frozen state, until another active particle shares its location, and turns it instantaneously back into activity. This model is known to have a phase transition, and we show that the critical density, controlling the phase transition, is less than one in any dimension and for any value of the sleep rate $λ$. We provide upper bounds for the critical density in both the small $λ$ and large $λ$ regimes.

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。

↑