This isn't homework but I'm interested. 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? What I'm getting is x' = -u(bx^2+ζ) + η(t) Which I don't know how to solve in closed form. Any ideas/suggestions? Thanks!