Matthias Schmidt, Joseph M. Brader
For classical many-body systems subject to over-damped Langevin dynamics, we propose a dynamical functional consisting of reversible free energy changes and irreversible power dissipation. Minimization with respect to the microscopic one-body current yields a closed equation of motion. Dynamical density functional theory is obtained when using the ideal gas power functional. Approximations to the excess (over ideal) power functional yield numerically tractable equations of motion beyond the adiabatic approximation, opening the door to the systematic study of systems far from equilibrium.
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http://arxiv.org/abs/1301.2526
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