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  • Title: Additivity, density fluctuations, and nonequilibrium thermodynamics for active Brownian particles.
    Author: Chakraborti S, Mishra S, Pradhan P.
    Journal: Phys Rev E; 2016 May; 93(5):052606. PubMed ID: 27300950.
    Abstract:
    Using an additivity property, we study particle-number fluctuations in a system of interacting self-propelled particles, called active Brownian particles (ABPs), which consists of repulsive disks with random self-propulsion velocities. From a fluctuation-response relation, a direct consequence of additivity, we formulate a thermodynamic theory which captures the previously observed features of nonequilibrium phase transition in the ABPs from a homogeneous fluid phase to an inhomogeneous phase of coexisting gas and liquid. We substantiate the predictions of additivity by analytically calculating the subsystem particle-number distributions in the homogeneous fluid phase away from criticality where analytically obtained distributions are compatible with simulations in the ABPs.
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