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arXiv · 2607.07906

Understanding quorum sensing self-organization: Clustering and defect-induced ordering of diffusing particles

Feifei Liu·Vyacheslav R. Misko·Yunyun Li·Fabio Marchesoni
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Abstract

Quorum sensing (QS) is known in biology as a form of intercellular communication mediated by signaling molecules called autoinducers. The QS protocol governs the transition from individual to collective cell behavior once a critical population density is reached. Using numerical simulations, we investigate how defects influence the QS transition and the structural organization of the resulting colonies. Our model system consists of a mixture of slow ("cold") and fast ("hot") diffusing colloidal particles that obey the QS protocol, together with defect particles characterized by a constant diffusivity. A striking reentrant solidification of QS particles, characterized by long-range order, is induced by hot defects, whereas cold defects give rise to amorphous structures with only short-range order. These findings deepen our understanding of the QS interaction and provide a mechanism to control the degree of organization in QS systems, with potential applications in robotics, social sciences, and medicine -- for instance, in overcoming antimicrobial resistance.

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Feifei Liu, Vyacheslav R. Misko, Yunyun Li, Fabio Marchesoni. 2026-07-08. Understanding quorum sensing self-organization: Clustering and defect-induced ordering of diffusing particles. https://arxiv.org/abs/2607.07906

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