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
Tags
active matter
motility-induced phase separation
continuum fields
collective motion
orientational ordering
phase separation
self-propelled rods
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