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We investigate anomalous damping of the monopole mode of a non-degenerate 3DBose gas under isotropic harmonic confinement as recently reported by the JILATOP trap experiment [D. S. Lob- ser, A. E. S. Barentine, E. A. Cornell, and H.J. Lewandowski (in preparation)]. Given a realistic confining potential, wedevelop a model for studying collective modes that includes the effects ofanharmonic corrections to a harmonic potential. By studying the influence ofthese trap anharmonicities throughout a range of temperatures and collisionalregimes, we find that the damping is caused by the joint mechanisms ofdephasing and collisional relaxation. Furthermore, the model is complimented byMonte Carlo simulations which are in fair agreement with data from the JILAexperiment.

Undamped nonequilibrium dynamics of a nondegenerate Bose gas in a 3D isotropic trap