Diffusion Time-Scale Invariance, Markovization Processes and Memory   Effects in Lennard-Jones Liquids
  We report the results of calculation of diffusion coefficients for Lennard-Jones liquids, based on the idea of time-scale invariance of relaxation processes in liquids. The results were compared with the molecular dynamics data for Lennard-Jones system and a good agreement of our theory with these data over a wide range of densities and temperatures was obtained. By calculations of the non-Markovity parameter we have estimated numerically statistical memory effects of diffusion in detail. 
Renat M. Yulmetyev, Anatolii V. Mokshin, Peter H\"anggi