1 research outputs found
Temperature-Dependent Frequency Shifts in Collective Excitations of a Bose-Einstein Condensate
By including the contribution of the thermal cloud to the Lagrangian of the
condensate of a Bose gas, we extend the time-dependent variational method at
zero temperature to study temperature-dependent low collective excitation
modes. A Gaussian trial wave function of the condensate and a static
distribution density of the thermal cloud are used, and analytical expressions
for temperature-dependent excitation frequencies obtained. Theoretical results
are compared with measurements in the JILA and MIT experiments.Comment: 13 pages, RevTex, 2 EPS figure