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  • Title: Continuum theory of phase separation kinetics for active Brownian particles.
    Author: Stenhammar J, Tiribocchi A, Allen RJ, Marenduzzo D, Cates ME.
    Journal: Phys Rev Lett; 2013 Oct 04; 111(14):145702. PubMed ID: 24138255.
    Abstract:
    Active Brownian particles (ABPs), when subject to purely repulsive interactions, are known to undergo activity-induced phase separation broadly resembling an equilibrium (attraction-induced) gas-liquid coexistence. Here we present an accurate continuum theory for the dynamics of phase-separating ABPs, derived by direct coarse graining, capturing leading-order density gradient terms alongside an effective bulk free energy. Such gradient terms do not obey detailed balance; yet we find coarsening dynamics closely resembling that of equilibrium phase separation. Our continuum theory is numerically compared to large-scale direct simulations of ABPs and accurately accounts for domain growth kinetics, domain topologies, and coexistence densities.
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