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Phase Transition in Bose Liquid. I

1972
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Progress of theoretical physics
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We show that the Bose liquid can be worked out in a way similar to the Landau Fermi liquid theory by decomposing the diagonal elements of the Boltzmann factor for the system into irreducible diagrams. The energy of the system is expressed by the functional of the occupation number n 1 r The excitation energy is defined by the variation of the energy with respect to np. The Landau f-functions (the second variations of the energy) are closely related to the excitation energy and play important

doi:10.1143/ptp.48.2210
fatcat:r6yqzmwpefh7xhztjz6gyvgpjm