Generalized thermodynamics of phase equilibria in scalar active matter.
Solon, Alexandre P
Phys Rev E
American Physical Society (APS)
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Solon, A. P., Stenhammar, J., Cates, M., Kafri, Y., & Tailleur, J. (2018). Generalized thermodynamics of phase equilibria in scalar active matter.. Phys Rev E, 97 (2-1), 020602. https://doi.org/10.1103/PhysRevE.97.020602
Motility-induced phase separation (MIPS) arises generically in fluids of self-propelled particles when interactions lead to a kinetic slowdown at high densities. Starting from a continuum description of scalar active matter akin to a generalized Cahn-Hilliard equation, we give a general prescription for the mean densities of coexisting phases in flux-free steady states that amounts, at a hydrodynamics scale, to extremizing an effective free energy. We illustrate our approach on two well-known models: self-propelled particles interacting either through a density-dependent propulsion speed or via direct pairwise forces. Our theory accounts quantitatively for their phase diagrams, providing a unified description of MIPS.
Engineering and Physical Sciences Research Council (EP/J007404/1)
External DOI: https://doi.org/10.1103/PhysRevE.97.020602
This record's URL: https://www.repository.cam.ac.uk/handle/1810/284699