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Collective communication in a transparent world: Phase transitions in a many-body Potts model and social-quantum duality (2508.20267v1)

Published 27 Aug 2025 in physics.soc-ph and cond-mat.stat-mech

Abstract: We consider the Schelling-like social competition reflected in "dynamics of opinions" among groups of agents ("communities") in a highly transparent world. Specifically, we investigate a $q$-state Potts spin system with competing two- and three-body interactions on a complete graph. Agents interact through pairwise repulsion (opposing opinions) between different communities and three-body attraction (shared opinions) within the same community. In the thermodynamic limit, we identify variants of three key phases: (a) a symmetric "mixed" phase of $q$ states, in which no single opinion dominates in the society (interpreted as a "democracy"), (b) a symmetric "mixed" phase but of $q-1$ states, and (c) a "consensus" phase, characterized by the emergence of a dominant opinion (or "ideology"), coexisting with symmetrically distributed minority views. Monte-Carlo simulations reveal finite-size effects and metastable switching between configurations. Furthermore, we establish a correspondence between our social model on a complete graph and the mean-field $SU(N)$ quantum spin system with both quadratic and cubic interactions, revealing a "social-quantum" duality. This duality provides new perspectives on both stratification of social communication, and quantum many-body phenomena, offering a unified framework for understanding emergent collective behavior in complex systems.

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