Physics

A particle-field approach bridges phase separation and collective motion in active matter

R. Großmann, I. S. Aranson, et al.

This groundbreaking research by Robert Großmann, Igor S. Aranson, and Fernando Peruani unveils a theoretical framework that revolutionizes our understanding of active matter by connecting phase separation and collective motion. The study illustrates the impact of varying particle shapes on motility-induced phase separation and enables a fascinating insight into order emergence in complex systems.

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Abstract

This work presents a theoretical framework representing active particles by continuum fields, bridging phase separation and collective motion in active matter. By varying particle shape from circular to ellipsoidal, the study shows how nonequilibrium stresses among self-propelled rods destabilize motility-induced phase separation (MIPS) and facilitate orientational ordering, connecting scalar and vectorial active matter. Both polar and nematic order can emerge and coexist, highlighting the dynamic nature of ordered states in active matter. The framework is applicable to various systems, including bacterial colonies, cytoskeletal extracts, and granular media.

Publisher

Nature Communications

Published On

Oct 23, 2020

Authors

Robert Großmann, Igor S. Aranson, Fernando Peruani

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