title: Many-body correlations versus mode-coupling effects in the dynamics of dense gases.
abstract: Time dependent contributions due to the triplet and quadruplet correlation functions have been combined with microscopically determined contribution due to the pair correlation function for the transverse stress correlation function. Comparison of the results with simulation data shows that contributions due to two- and three-body static correlation functions are sufficient to understand the viscous dynamics of dense gases. However, close to the triple point, it becomes necessary to include the contribution due to the four-body correlation function. The contribution due to the mode coupling effect has been contrasted with the contribution due to three- and four-body correlation functions. It is noted that the mode coupling contribution plays a similar role as that due to many-body correlation functions.
authors.affiliation: Department of Physics, Panjab University, Chandigarh-160 014, India.
authors.forename: Puneet
authors.initials: P
authors.lastname: Sharma
authors.forename: K
authors.initials: K
authors.lastname: Tankeshwar