Additivity, density fluctuations, and nonequilibrium thermodynamics for active Brownian particles.

  title={Additivity, density fluctuations, and nonequilibrium thermodynamics for active Brownian particles.},
  author={Subhadip Chakraborti and Shradha Mishra and Punyabrata Pradhan},
  journal={Physical review. E},
  volume={93 5},
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… 

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