  The Recent Fluid Deformation Closure (RFDC) model of lagrangian turbulence is
recast in path-integral language within the framework of the Martin-Siggia-Rose
functional formalism. In order to derive analytical expressions for the
velocity-gradient probability distribution functions (vgPDFs), we carry out
noise renormalization in the low-frequency regime and find approximate extrema
for the Martin-Siggia-Rose effective action. We verify, with the help of Monte
Carlo simulations, that the vgPDFs so obtained yield a close description of the
single-point statistical features implied by the original RFDC stochastic
differential equations.
