SHORT-WAVELENGTH ASYMPTOTICS OF TIME CORRELATION FUNCTIONS
Ignatyuk · Condensed Matter Physics · 2001
Short-wavelength asymptotics of time correlation functions (TCF) of simple classical fluids is considered in the framework of short time expansion.The explicit expressions for zeroth time moments up to the 8-th order of cumulant are presented in the framework of additive approach.It is shown that unlike the dynamic structure factor which is found to have Gaussian form in short-wavelength limit, nongaussian corrections are present in TCF "density-energy" and "energy-energy".The comparison with generalized collective modes approach as well as data for quantum liquids is discussed.