arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.04162math.PR
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环面上的q-选举模型

The q-voter model on the torus

Pooja Agarwal, Mackenzie Simper, Rick Durrett

摘要:

在$q$ -选举模型中,$x$的选举者以速率$f_x^q$改变其意见,其中$f_x$是具有相反意见的邻居的分数。平均场计算表明,如果是$q<1$,则意见和如果是$q>1$,则聚类之间应该共存。这个模型已经被物理学家广泛研究,但我们不知道任何严格的结果。在本文中,我们使用的选举模型扰动的机械表明,该扰动行为保持$q$接近1。更确切地说,我们表明,如果$q<1$,那么对于任何$m<\infty$的过程中的三维环面与$n$点生存的时间$n^m$,并在初始瞬态阶段后的密度,它总是接近1/2。如果是$q>1$,那么这个过程很快就达到固定在一个观点上。值得注意的是,在第二种情况下,极限常微分方程(在其加速的时间尺度上)在时间$\log n$达到0,但同一时间尺度上的随机过程在时间$(1/3)\log n$消失。

英文摘要:

In the $q$-voter model, the voter at $x$ changes its opinion at rate $f_x^q$, where $f_x$ is the fraction of neighbors with the opposite opinion. Mean-field calculations suggest that there should be coexistence between opinions if $q<1$ and clustering if $q>1$. This model has been extensively studied by physicists, but we do not know of any rigorous results. In this paper, we use the machinery of voter model perturbations to show that the conjectured behavior holds for $q$ close to 1. More precisely, we show that if $q<1$, then for any $m<\infty$ the process on the three-dimensional torus with $n$ points survives for time $n^m$, and after an initial transient phase has a density that it is always close to 1/2. If $q>1$, then the process rapidly reaches fixation on one opinion. It is interesting to note that in the second case the limiting ODE (on its sped up time scale) reaches 0 at time $\log n$ but the stochastic process on the same time scale dies out at time $(1/3)\log n$.

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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