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arXiv 2107.03338physics.soc-phcond-mat.stat-mech
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随机图上广义反整合q选民模型的不连续相变

Discontinuous phase transitions in the q-voter model with generalized anticonformity on random graphs

Angelika Abramiuk-Szurlej, Arkadiusz Lipiecki, Jakub Pawłowski, Katarzyna Sznajd-Weron

摘要:

研究了随机Erdens-Rényi图上具有广义反整合的二元$q$ -选民模型.在这样的模型中,两种类型的社会反应,一致性和反一致性,发生互补的概率和影响源$q_c$的大小在一致性的情况下是独立的影响源$q_a$的大小在反一致性的情况下。对于$q_c=q_a=q$,模型简化为具有反一致性的原始$q$ -选民模型。以前,这样的广义模型只在完全图上进行了研究,这与平均场方法相对应。结果表明,它可以显示不连续的相变为$q_c \ge q_a + Δq$,其中$Δq=4$为$q_a \le 3$和$Δq=3$为$q_a>3$。在本文中,我们提出的问题,如果不连续的相变生存的随机图的平均节点度$\langle k\rangle \le 150$经验观察社交网络。使用对近似,以及Monte Carlo模拟,我们表明,不连续的相变确实可以生存,即使是相对较小的值的$\langle k\rangle$。此外,我们表明,$q_a < q_c - 1$对近似的结果重叠的Monte Carlo的。另一方面,$q_a \ge q_c - 1$对近似给出了定性错误的结果,表明不连续的相变既没有观察到的模拟,也没有在平均场的方法。最后,我们报告了一个有趣的结果表明,对近似和平均场的方法内获得的旋节之间的差异遵循幂律相对于$\langle k\rangle$,只要对近似正确地表明相变的类型。

英文摘要:

We study the binary $q$-voter model with generalized anticonformity on random Erdős-Rényi graphs. In such a model, two types of social responses, conformity and anticonformity, occur with complementary probabilities and the size of the source of influence $q_c$ in case of conformity is independent from the size of the source of influence $q_a$ in case of anticonformity. For $q_c=q_a=q$ the model reduces to the original $q$-voter model with anticonformity. Previously, such a generalized model was studied only on the complete graph, which corresponds to the mean-field approach. It was shown that it can display discontinuous phase transitions for $q_c \ge q_a + Δq$, where $Δq=4$ for $q_a \le 3$ and $Δq=3$ for $q_a>3$. In this paper, we pose the question if discontinuous phase transitions survive on random graphs with an average node degree $\langle k\rangle \le 150$ observed empirically in social networks. Using the pair approximation, as well as Monte Carlo simulations, we show that discontinuous phase transitions indeed can survive, even for relatively small values of $\langle k\rangle$. Moreover, we show that for $q_a < q_c - 1$ pair approximation results overlap the Monte Carlo ones. On the other hand, for $q_a \ge q_c - 1$ pair approximation gives qualitatively wrong results indicating discontinuous phase transitions neither observed in the simulations nor within the mean-field approach. Finally, we report an intriguing result showing that the difference between the spinodals obtained within the pair approximation and the mean-field approach follows a power law with respect to $\langle k\rangle$, as long as the pair approximation indicates correctly the type of the phase transition.

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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