Thermal fluctuations of the pair-interaction forces in two-dimensional fluid Yukawa systems

In the paper, the particle dynamics in two-dimensional (2D) Yukawa systems were studied numerically. New data on a density of the thermal fluctuations of pair-interaction forces have been obtained for non-ideal systems in a wide range of their parameters. Comparisons of these thermal fluctuations with the internal energy density were performed. For the first time we have found, that for strongly correlated fluid 2D Yukawa systems the dielectric constant is inversely proportional to the second derivative of a pair potential at the mean inter-particle distance.