= Probability current velocity
{title2=$\mathbf V=\mathbf J/\psi$}
Where a <probability density> $\psi$ is positive, its <Fokker-Planck probability current> can be written $\mathbf J=\psi\mathbf V$, giving a continuity equation $\partial_t\psi+\nabla\cdot(\psi\mathbf V)=0$. This velocity transports probability. It is not a differentiable instantaneous velocity of an overdamped <Brownian motion> path. In the <Hookean dumbbell model>, its osmotic term is $-(2k_BT/\zeta)\nabla\log\psi$.
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