title: On the mode-coupling treatment of collective density fluctuations for quantum liquids: para-hydrogen and normal liquid helium.
abstract: A novel quantum mode coupling theory combined with a kinetic approach is developed for the description of collective density fluctuations in quantum liquids characterized by Boltzmann statistics. Three mode-coupling approximations are presented and applied to study the dynamic response of para-hydrogen near the triple point and normal liquid helium above the λ-transition. The theory is compared with experimental results and to the exact imaginary time data generated by path integral Monte Carlo simulations. While for liquid para-hydrogen the combination of kinetic and quantum mode-coupling theory provides semi-quantitative results for both short and long time dynamics, it fails for normal liquid helium. A discussion of this failure based on the ideal gas limit is presented.
authors.affiliation: School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
authors.forename: Orly
authors.initials: O
authors.lastname: Kletenik-Edelman
authors.forename: David R
authors.initials: DR
authors.lastname: Reichman
authors.forename: Eran
authors.initials: E
authors.lastname: Rabani