Detecting Core-Periphery Structures by Surprise Jeroen van Lidth de Jeude, Guido Caldarelli, and Tiziano Squartini IMT School for Advanced Studies, Piazza S.Francesco 19, 55100 Lucca - Italy (Dated: October 12, 2018) Detecting the presence of mesoscale...
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Detecting Core-Periphery Structures by Surprise Jeroen van Lidth de Jeude, Guido Caldarelli, and Tiziano Squartini IMT School for Advanced Studies, Piazza S.Francesco 19, 55100 Lucca - Italy (Dated: October 12, 2018) Detecting the presence of mesoscale structures in complex networks is of primary importance. This is especially true for financial networks, whose structural organization deeply affects their resilience to events like default cascades, shocks propagation, etc. Several methods have been proposed, so far, to detect communities, i.e. groups of nodes whose connectivity is significantly large. Communities, however do not represent the only kind of mesoscale structures characterizing real- world networks: other examples are provided by bow-tie structures, core-periphery structures and bipartite structures. Here we propose a novel method to detect statistically-significant bimodular arXiv:1810.04717v1 [physics.soc-ph] 10 Oct 2018 structures, i.e. either bipartite or core-peripher
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