随机传染-恢复模型的有限尺寸标度
Finite-size scaling of the stochastic susceptible-infected-recovered model
摘要:
通过数值模拟和有限尺寸标度方法,得到了正方形格子上随机传染-感染-恢复模型的临界性态。的序参量以及在恢复的个人的数量的分布被确定为一个函数的感染率的几个值的系统大小。围绕临界性的分析是通过探讨本模型与标准逾渗理论之间的密切关系而得到的。对于正方形体系,UP的值为1.0167(1),它等于尺寸分布的二阶矩与一阶矩的平方之比U乘以序参量P,这一值与位渗流和键渗流的值相同,进一步证实了SIR模型也属于渗流类。
英文摘要:
The critical behavior of the stochastic susceptible-infected-recovered model on a square lattice is obtained by numerical simulations and finite-size scaling. The order parameter as well as the distribution in the number of recovered individuals is determined as a function of the infection rate for several values of the system size. The analysis around criticality is obtained by exploring the close relationship between the present model and standard percolation theory. The quantity UP, equal to the ratio U between the second moment and the squared first moment of the size distribution multiplied by the order parameter P, is shown to have, for a square system, a universal value 1.0167(1) that is the same as for site and bond percolation, confirming further that the SIR model is also in the percolation class.
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