Velocity gradient power functional for Brownian dynamics

D. de las Heras, and M. Schmidt
Phys. Rev. Lett., 120, 028001, (2018)     DOI: 10.1103/PhysRevLett.120.028001
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We present an explicit and simple approximation for the superadiabatic excess (over ideal gas) free power functional, admitting the study of the nonequilibrium dynamics of overdamped Brownian many- body systems. The functional depends on the local velocity gradient and is systematically obtained from treating the microscopic stress distribution as a conjugate field. The resulting superadiabatic forces are beyond dynamical density functional theory and are of a viscous nature. Their high accuracy is demonstrated by comparison to simulation results.

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