1. The problem statement, all variables and given/known data This isn't actually homework but I'm really interested in finding the solution. So I have the langevin equation dy/dt = -dV/dy +η(t) where V(y) = -by^3/3 + ζy how can I turn this into a fokker-planck equation? 2. Relevant equations x' = v(x) +η(t) v(x)= -udV/dx 3. The attempt at a solution Using the format of the langevin equation x' = v(x) +η(t), I get x' = -u(bx^2+ζ) + η(t) (( v(x)= -udV/dx )) Which I don't know how to solve in closed form. Any ideas/suggestions? Thanks!