Communication: Simple and accurate uniform electron gas correlation energy for the full range of densities

A simple correlation energy functional for the uniform electron gas is derived based on the secondorder Moller-Plesset perturbation theory. It can reproduce the known correlation functional in the high-density limit, while in the mid-density range maintaining a good agreement with the near-exact correlation energy of the uniform electron gas to within 2 x 10(-3) hartree. The correlation energy is a function of a density parameter rs and is of the form a * ln( 1 + b/r(s) + b/r(s2)). The constants "a" and " b" are derived from the known correlation functional in the high-density limit. Comparisons to the Ceperley-Alder's near-exact Quantum Monte Carlo results and the Vosko-Wilk-Nusair correlation functional are also reported. Published by AIP Publishing.