Abstract
Temporal networks, i.e., networks in which the interactions among a set of elementary units change over time, can be modelled in terms of time-varying graphs, which are time-ordered sequences of graphs over a set of nodes. In such graphs, the concepts of node adjacency and reachability crucially depend on the exact temporal ordering of the links. Consequently, all the concepts and metrics proposed and used for the characterisation of static complex networks have to be redefined or appropriately extended to time-varying graphs, in order to take into account the effects of time ordering on causality. In this chapter we discuss how to represent temporal networks and we review the definitions of walks, paths, connectedness and connected components valid for graphs in which the links fluctuate over time. We then focus on temporal node–node distance, and we discuss how to characterise link persistence and the temporal small-world behaviour in this class of networks. Finally, we discuss the extension of classic centrality measures, including closeness, betweenness and spectral centrality, to the case of time-varying graphs, and we review the work on temporal motifs analysis and the definition of modularity for temporal graphs.
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Notes
- 1.
In order to avoid confusion with the size Δt of the time-window used to define the temporal snapshot of a time-varying graph, here we preferred to use Δτ instead of the original Δt proposed by the authors of [20]. Also, notice that the authors use to call events what we have called here contacts.
- 2.
It is possible to prove that a random walk on a graph always converges towards a stationary state, independently of the initial condition, if the adjacency matrix of the graph is primitive, which is the case for the vast majority of real graphs.
- 3.
- 4.
This is required to ensure the existence of a stationary state for the Laplacian dynamics on the graph.
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Acknowledgements
This work was funded in part through EPSRC Project MOLTEN (EP/I017321/1).
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Nicosia, V., Tang, J., Mascolo, C., Musolesi, M., Russo, G., Latora, V. (2013). Graph Metrics for Temporal Networks. In: Holme, P., Saramäki, J. (eds) Temporal Networks. Understanding Complex Systems. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36461-7_2
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