Determination of the vapor-liquid critical point from the short-time dynamics

Considering the average potential energy per particle as the parameter, we investigate the early-time dynamics of vapor-liquid transition in the criti cal region for 2D Lennard-Jones fluids by using NVT molecular dynamics simu lations. The results verify the existence of short-time dynamic scaling in the fluid systems and show that the critical point T can be determined by t he universal short-time behavior. The obtained value of T-C = 0.540 from th e short-time dynamics is very close to the value of 0.533 from the Monte Ca rlo simulations in the equilibrium state of the systems.