NETWORK HETEROGENEITY AND NODE CAPACITY LEAD TO HETEROGENEOUS SCALING OF FLUCTUATIONS IN RANDOM WALKS ON GRAPHS

作者：Kosmidis Kosmas^*; Beber Moritz; Huett Marc Thorsten

来源：Advances in Complex Systems, 2015, 18(1-2): 1550007.

DOI：10.1142/S0219525915500071

• Complex networks
• random walks
• time series
• fluctuations
• flux networks

Random walks are one of the best investigated dynamical processes on graphs. A particularly fascinating phenomenon is the scaling relationship of fluctuations sigma with the average flux < f >. Here we analyze how network topology and nodes with finite capacity lead to deviations from a simple scaling law sigma similar to < f >(alpha). Sources of randomness are the random walk itself (internal noise) and the fluctuation of the number of walkers (external noise). We obtained exact results for the extreme case of a star network which are indicative of the behavior of large scale systems with a broad degree distribution. The latter are subsequently studied using Monte Carlo simulations. We find that the network heterogeneity amplifies the effects of external noise. By computing the "effective" scaling of each node we show that multiple scaling relationships can coexist in a graph with a heterogeneous degree distribution at an intermediate level of external noise. Finally, we analyze the effect of a finite capacity of nodes for random walkers and find that this also can lead to a heterogeneous scaling of fluctuations.

• 出版日期2015-3