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Two-Fluid Hydrodynamics for a Trapped Weakly-Interacting Bose Gas | | E. Zaremba
; A. Griffin
; T. Nikuni
; | | Date: |
14 May 1997 | | Subject: | cond-mat | | Affiliation: | Queen’s U., Canada), A. Griffin and T. Nikuni (U. of Toronto | | Abstract: | We derive the coupled equations of motion for the condensate (superfluid) and non-condensate (normal fluid) degrees of freedom in a trapped Bose gas at finite temperatures. Our results are based on the Hartree-Fock-Popov approximation for the time-dependent condensate wavefunction and an assumption of local equilibrium for the non-condensate atoms. In the case of a uniform weakly-interacting gas, our formalism gives a microscopic derivation of the well-known two-fluid equations of Landau. The collective modes in a parabolically trapped Bose gas include the analogue of the out-of-phase second sound mode in uniform systems. | | Source: | arXiv, cond-mat/9705134 | | Services: | Forum | Review | PDF | Favorites | |
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