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We utilize a two-gas model to simulate collective oscillations of aBose-Einstein condensate at finite temperatures. The condensate is describedusing a generalized Gross-Pitaevskii equation, which is coupled to a thermalcloud modelled by a Monte Carlo algorithm. This allows us to include thecollective dynamics of both the condensed and non-condensed componentsself-consistently. We simulate quadrupolar excitations, and measure the dampingrate and frequency as a function of temperature. We also observe revivals incondensate oscillations at high temperatures, and in the thermal cloud at lowtemperature. Extensions of the model to include non-equilibrium effects anddescribe more complex phenomena are discussed.Comment: 5 pages, 3 figure

Damping and revivals of collective oscillations in a finite-temperature model of trapped Bose-Einstein condensation