relation: http://eprints.imtlucca.it/1078/ title: Invasion percolation and the time scaling behavior of a queuing model of human dynamics creator: Gabrielli, Andrea creator: Caldarelli, Guido subject: HA Statistics subject: QC Physics description: In this paper we study the properties of the Barabási model of queuing under the hypothesis that the number of tasks is steadily growing in time. We map this model exactly onto an invasion percolation dynamics on a Cayley tree. This allows us to recover the correct waiting time distribution PW(τ)~τ−3/2 at the stationary state (as observed in different realistic data) and also to characterize it as a sequence of causally and geometrically connected bursts of activity. We also find that the approach to stationarity is very slow. publisher: IOPscience date: 2009 type: Article type: PeerReviewed identifier: Gabrielli, Andrea and Caldarelli, Guido Invasion percolation and the time scaling behavior of a queuing model of human dynamics. Journal of Statistical Mechanics: Theory and Experiment, 2009 (02). P02046. ISSN 1742-5468 (2009) relation: http://dx.doi.org/10.1088/1742-5468/2009/02/P02046 relation: doi:10.1088/1742-5468/2009/02/P02046