title: Transport properties of normal liquid helium: comparison of various methodologies.
abstract: We revisit the problem of self-diffusion in normal liquid helium above the lambda transition. Several different methods are applied to compute the velocity autocorrelation function. Since it is still impossible to determine the exact result for the velocity autocorrelation function from simulation, we appeal to the computation of short-time moments to determine the accuracy of the different approaches at short times. The main conclusion reached from our study is that both the quantum mode-coupling theory and the numerical analytic continuation approach must be regarded as a viable and competitive methods for the computation of dynamical properties of quantum systems.
authors.affiliation: School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
authors.forename: Eran
authors.initials: E
authors.lastname: Rabani
authors.forename: Goran
authors.initials: G
authors.lastname: Krilov
authors.forename: David R
authors.initials: DR
authors.lastname: Reichman
authors.forename: B J
authors.initials: BJ
authors.lastname: Berne