Coupled Hartree-Fock-Bogoliubov kinetic equations for a trapped Bose gas

Дата и время публикации : 1998-12-16T18:25:31Z

Авторы публикации и институты :
Milena Imamovic-Tomasovic
Allan Griffin

Ссылка на журнал-издание: Phys. Rev. A 60, 494 (1999).
Коментарии к cтатье: 25 pages
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: Using the Kadanoff-Baym non-equilibrium Green’s function formalism, we derive the self-consistent Hartree-Fock-Bogoliubov (HFB) collisionless kinetic equations and the associated equation of motion for the condensate wavefunction for a trapped Bose-condensed gas. Our work generalizes earlier work by Kane and Kadanoff (KK) for a uniform Bose gas. We include the off-diagonal (anomalous) pair correlations, and thus we have to introduce an off-diagonal distribution function in addition to the normal (diagonal) distribution function. This results in two coupled kinetic equations. If the off-diagonal distribution function can be neglected as a higher-order contribution, we obtain the semi-classical kinetic equation recently used by Zaremba, Griffin and Nikuni (based on the simpler Popov approximation). We discuss the static local equilibrium solution of our coupled HFB kinetic equations within the semi-classical approximation. We also verify that a solution is the rigid in-phase oscillation of the equilibrium condensate and non-condensate density profiles, oscillating with the trap frequency.

Category: Physics