正方形格点上易感-感染-扩散(SIR)模型的临界性态
On the critical behavior of the Susceptible-Infected-Recovered (SIR) model on a square lattice
摘要:
通过数值模拟和流行病分析,得到了正方形格点上随机异步SIR模型的转移点c_0=0.1765005(10),其中c是选定的感染点自发恢复而不是试图感染一个邻居的概率.这一点对应于λ_c =(1-c_0)/c_0 = 4.66571(3)的感染/恢复率和(1-c_0)/(1 + 3c_0)= 0.538410(2)的净传播率,其落在位点阈值和键阈值的严格界限之间。该模型的临界行为与2-D渗流普适类是一致的,但局部增长概率不同于动态渗流集团增长的概率,这是明确证明。
英文摘要:
By means of numerical simulations and epidemic analysis, the transition point of the stochastic, asynchronous Susceptible-Infected-Recovered (SIR) model on a square lattice is found to be c_0=0.1765005(10), where c is the probability a chosen infected site spontaneously recovers rather than tries to infect one neighbor. This point corresponds to an infection/recovery rate of lambda_c = (1-c_0)/c_0 = 4.66571(3) and a net transmissibility of (1-c_0)/(1 + 3 c_0) = 0.538410(2), which falls between the rigorous bounds of the site and bond thresholds. The critical behavior of the model is consistent with the 2-d percolation universality class, but local growth probabilities differ from those of dynamic percolation cluster growth, as is demonstrated explicitly.
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