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Systematic extension of the Cahn-Hilliard model for motility-induced phase separation

  • Lisa Rapp
  • Fabian Bergmann
  • Walter ZimmermannEmail author
Regular Article
  • 60 Downloads

Abstract.

We consider a continuum model for motility-induced phase separation (MIPS) of active Brownian particles (ABP) (J. Chem. Phys. 142, 224149 (2015)). Using a recently introduced perturbative analysis (Phys. Rev. E 98, 020604(R) (2018)), we show that this continuum model reduces to the classic Cahn-Hilliard (CH) model near the onset of MIPS. This makes MIPS another example of the so-called active phase separation. We further introduce a generalization of the perturbative analysis to the next higher order. This results in a generic higher-order extension of the CH model for active phase separation. Our analysis establishes the mathematical link between the basic mean-field ABP model on the one hand, and the leading order and extended CH models on the other hand. Comparing numerical simulations of the three models, we find that the leading-order CH model agrees nearly perfectly with the full continuum model near the onset of MIPS. We also give estimates of the control parameter beyond which the higher-order corrections become relevant and compare the extended CH model to recent phenomenological models.

Graphical abstract

Keywords

Soft Matter: Self-organisation and Supramolecular Assemblies 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Theoretische Physik IUniversität BayreuthBayreuthGermany

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