For the linear Hookean chain, the Dirac–Frenkel Gaussian variational approximation of the Fokker–Planck equation reproduces exactly the classical diffusive Oldroyd-B moment-closure equations for the conformation tensor.
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An equivalence of moment closure and nonlinear variational approximation of the Fokker-Planck equation for dilute polymeric flow
For the linear Hookean chain, the Dirac–Frenkel Gaussian variational approximation of the Fokker–Planck equation reproduces exactly the classical diffusive Oldroyd-B moment-closure equations for the conformation tensor.