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arXiv 1312.2269physics.soc-ph
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一维q-选举模型的退出概率。大型网络的分析结果和模拟

On the exit probability of the one dimensional q-voter model. Analytical results and simulations for large networks

André M. Timpanaro, Carmen P. C. Prado

摘要:

我们讨论了一维$q$ -选民模型的退出概率,并提出了工具,通过模拟在大型网络(周围$10^7$网站)和analyticaly在网络是无限大的限制,以获得这种概率的估计。我们认为,结果$E(ρ) = \frac{ρ^q}{ρ^q + (1-ρ)^q}$,这是发现在3个以前的作品(2008年EPL 82 18006和2008年EPL 82 18007,$q=2$和2011年PRE 84 031117,$q>2$)使用小网络(周围$10^3$网站),是一个很好的近似,但有明显的偏差较大的系统大小。我们还证明了,在一些简单而直观的假设下,退出概率必须服从不等式,$\frac{ρ^q}{ρ^q + (1-ρ)} \leq E(ρ) \leq \fracρ{ρ+ (1-ρ)^q}$,在无限大小的限制。我们相信这否定了(2011 EPL 95 48005)的建议,即这个结果将是有限大小效应,退出概率实际上是一个阶梯函数。我们还展示了如何的结果,即退出概率不能是一个阶梯函数,可以调和的Galam统一框架,这也是一个争议的来源。

英文摘要:

We discuss the exit probability of the one dimensional $q$-voter model and present tools to obtain estimates about this probability both through simulations in large networks (around $10^7$ sites) and analyticaly in the limit where the network is infinetely large. We argue that the result $E(ρ) = \frac{ρ^q}{ρ^q + (1-ρ)^q}$, that was found in 3 previous works (2008 EPL 82 18006 and 2008 EPL 82 18007, for the case $q=2$ and 2011 PRE 84 031117, for $q>2$) using small networks (around $10^3$ sites), is a good approximation, but there are noticeable deviations for larger system sizes. We also show that, under some simple and intuitive hypothesis, the exit probability must obey the inequality, $\frac{ρ^q}{ρ^q + (1-ρ)} \leq E(ρ) \leq \fracρ{ρ+ (1-ρ)^q}$, in the infinite size limit. We believe this settles in the negative the suggestion made (2011 EPL 95 48005) that this result would be a finite size effect, with the exit probability actualy being a step function. We also show how the result, that the exit probability cannot be a step function, can be reconciled with the Galam unified frame, which was also a source of controversy.

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