Dynamical density functional theory for interacting Brownian particles: stochastic or deterministic?

Andrew J Archer, Markus Rauscher
2004 Journal of Physics A: Mathematical and General  
We aim to clarify confusions in the literature as to whether or not dynamical density functional theories for the one-body density of a classical Brownian fluid should contain a stochastic noise term. We point out that a stochastic as well as a deterministic equation of motion for the density distribution can be justified, depending on how the fluid one-body density is defined -- i.e. whether it is an ensemble averaged density distribution or a spatially and/or temporally coarse grained density distribution.
doi:10.1088/0305-4470/37/40/001 fatcat:mjya6ls4jncdtbcyoxijnr6wre