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Generalized thermodynamics of phase equilibria in scalar active matter

Solon, Alexandre P.; Stenhammar, Joakim LU ; Cates, Michael E.; Kafri, Yariv and Tailleur, Julien (2018) In Physical Review E 97(2).
Abstract

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.

Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review E
volume
97
issue
2
publisher
American Physical Society
external identifiers
  • scopus:85042231571
ISSN
2470-0045
DOI
10.1103/PhysRevE.97.020602
language
English
LU publication?
yes
id
773ff640-4e35-49bd-b13b-cfb478ef163e
alternative location
https://arxiv.org/abs/1609.03483
date added to LUP
2018-03-06 08:21:22
date last changed
2018-07-15 04:47:53
@article{773ff640-4e35-49bd-b13b-cfb478ef163e,
  abstract     = {<p>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.</p>},
  articleno    = {020602},
  author       = {Solon, Alexandre P. and Stenhammar, Joakim and Cates, Michael E. and Kafri, Yariv and Tailleur, Julien},
  issn         = {2470-0045},
  language     = {eng},
  month        = {02},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review E},
  title        = {Generalized thermodynamics of phase equilibria in scalar active matter},
  url          = {http://dx.doi.org/10.1103/PhysRevE.97.020602},
  volume       = {97},
  year         = {2018},
}