The effect of spatiality on multiplex networks
Abstract
Many multiplex networks are embedded in space, with links more likely to exist between nearby nodes than distant nodes. For example, interdependent infrastructure networks can be represented as multiplex networks, where each layer has links among nearby nodes. Here, we model the effect of spatiality on the robustness of a multiplex network embedded in 2dimensional space, where links in each layer are of variable but constrained length. Based on empirical measurements of realworld networks, we adopt exponentially distributed link lengths with characteristic length ζ. By changing ζ, we modulate the strength of the spatial embedding. When ζ → ∞, all link lengths are equally likely, and the spatiality does not affect the topology. However, when \zeta→ 0 only short links are allowed, and the topology is overwhelmingly determined by the spatial embedding. We find that, though longer links strengthen a singlelayer network, they make a multilayer network more vulnerable. We further find that when ζ is longer than a certain critical value, \zeta_{c} , abrupt, discontinuous transitions take place, while for \zeta<\zeta_{c} the transition is continuous, indicating that the risk of abrupt collapse can be eliminated if the typical link length is shorter than \zeta_{c} .
 Publication:

EPL (Europhysics Letters)
 Pub Date:
 August 2016
 DOI:
 10.1209/02955075/115/36002
 Bibcode:
 2016EL....11536002D