Excitation Spectrum for Weakly Interacting Bose Gas and the Liquid Structure Function of Helium
In this paper the excitation spectrum of a Bose gas characterized by a pairwise Fourier-transformable potential λV(r) is calculated to three leading orders in the strength parameter λ, first by the Hugenholtz-Pines prescription,1 then by the method of correlated basis functions (CBF).
KeywordsExcitation Spectrum Perturbative Correction Correlate Basis Function Diagrammatic Perturbation Average Interparticle Spacing
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