Abstract
Results of many-body calculations of the dynamic structure factor of bulk liquid 4He in 2D and 3D are presented and analyzed. The problem is reformulated as one of solving equations of motion for the one- and two-body correlations derived from a microscopic Hamiltonian and from a Jastrow-Feenberg wave function with time-dependent correlation functions through the least-action principle. At the first practical level of implementation this reproduces the correlated basis functions (CBF) theory, which gives qualitatively correct low-energy properties. The theory is used to study the anomalous dispersion of low-momentum phonons and the high-momentum behavior of the single-excitation branch near the two-roton continuum.
Published Version
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