Physics – Condensed Matter
Scientific paper
1999-08-03
Physics
Condensed Matter
Nordita preprint NORDITA-1999/46 CM
Scientific paper
We calculate frequencies and damping rates of the lowest collective modes of a dilute Bose gas confined in an anisotropic trapping potential above the Bose-Einstein transition temperature. From the Boltzmann equation with a simplified collision integral we derive a general dispersion relation that interpolates between the collisionless and hydrodynamic regimes. In the case of axially symmetric traps we obtain explicit expressions for the frequencies and damping rates of the lowest modes in terms of a phenomenological collision time. Our results are compared with microscopic calculations and experiments.
Khawaja U. Al
Pethick Christopher J.
Smith Hal
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