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The Enrico Fermi Research Center - CREF promotes original and high-impact lines of research, based on physical methods, but with a strong interdisciplinary character and in relation to the main problems of the modern knowledge society.
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Multi-scale Laplacian community detection in heterogeneous networks
Phys. Rev. Research 7, 013065 – Published 17 January, 2025
DOI: https://doi.org/10.1103/PhysRevResearch.7.013065
Authors: Pablo Villegas (CREF), Andrea Gabrielli (CREF, Roma 3), Anna Poggialini (CREF, Sapienza), Tommaso Gili (IMT Scuola Alti Studi Lucca , ISC)
Abstract: Heterogeneous and complex networks represent intertwined interactions between real-world elements or agents. Determining the multiscale mesoscopic organization of clusters and intertwined structures is still a fundamental and open problem of complex network theory. By taking advantage of the recent Laplacian renormalization group (LRG), we scrutinize information diffusion pathways throughout networks to shed further light on this issue. Based on internode communicability, our definition provides a clear-cut framework for resolving the multiscale mesh of structures in complex networks, disentangling their intrinsic arboreal architecture. As it does not consider any topological null-model assumption, the LRG naturally permits the introduction of scale-dependent optimal partitions. Moreover, we demonstrate the existence of a particular class of nodes, called metastable nodes, that switch regions to which they belong at different scales, likely playing a pivotal role in cross-regional communication and, therefore, in managing macroscopic effects of the whole network.Authors