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arXiv 1402.2832cond-mat.stat-mech
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复杂网络接触过程的非均匀对逼近

Heterogeneous pair-approximation for the contact process on complex networks

Angélica S. Mata, Ronan S. Ferreira, Silvio C. Ferreira

摘要:

最近的工作表明,在高度非均匀随机网络上运行的接触过程可以用非均匀平均场论来描述。然而,一些重要的方面,如过渡点和强修正的有限尺寸标度在模拟中观察到的是没有定量再现在这个理论。我们开发了一个异质对近似,最简单的平均场的方法,考虑到动力学的相关性,接触过程。在此理论中得到的过渡点与模拟非常吻合。与一个简单的齐次对近似的接近,显示在连续的齐次集群近似的过渡点远离模拟结果。我们证明了非均匀对近似在无穷大极限下的临界指数与单顶点理论的临界指数相同。然而,良好的匹配与模拟,为广泛的网络规模,获得子领导的有限大小的修正时,明确考虑到新的理论。目前的方法可以适用于网络上的动态过程一般提供了一个有利可图的战略,分析评估微调理论校正。

英文摘要:

Recent works have shown that the contact process running on the top of highly heterogeneous random networks is described by the heterogeneous mean-field theory. However, some important aspects as the transition point and strong corrections to the finite-size scaling observed in simulations are not quantitatively reproduced in this theory. We develop a heterogeneous pair approximation, the simplest mean-field approach that takes into account dynamical correlations, for the contact process. The transition points obtained in this theory are in very good agreement with simulations. The proximity with a simple homogeneous pair-approximation is elicited showing that the transition point in successive homogeneous cluster approximations moves away from the simulation results. We show that the critical exponents of the heterogeneous pair-approximation in the infinite-size limit are the same as those of the one-vertex theory. However, excellent matches with simulations, for a wide range of network sizes, is obtained when sub-leading finite-size corrections given by the new theory are explicitly taken into account. The present approach can be suited to dynamical processes on networks in general providing a profitable strategy to analytically assess fine-tuning theoretical corrections.

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