Damped Bogoliubov excitations of a condensate interacting with a static thermal cloud

Abstract

We calculate the damping of condensate collective excitations at finite temperatures arising from the lack of equilibrium between the condensate and thermal atoms. We neglect the non-condensate dynamics by fixing the thermal cloud in static equilibrium. We derive a set of generalized Bogoliubov equations for finite temperatures that contain an explicit damping term due to collisional exchange of atoms between the two components. We have numerically solved these Bogoliubov equations to obtain the temperature dependence of the damping of the condensate modes in a harmonic trap. We compare these results with our recent work based on the Thomas-Fermi approximation.

9 pages, 3 figures included. Submitted to PRA

References in corpus (5)

• Collisionless dynamics of dilute Bose gases: Role of quantum and thermal fluctuations
• Quantum Kinetic Theory V: Quantum kinetic master equation for mutual interaction of condensate and noncondensate
• Bose condensates in a harmonic trap near the critical temperature
• Damping of condensate collective modes due to equilibration with the non-condensate
• Kinetic Theory of Collective Excitations and Damping in Bose-Einstein Condensed Gases

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