1999/08/03 by U. Al Khawaja, Khawaja, U. Al, C. J. Pethick +3
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed Matter (cond-mat) #FOS: Physical sciences #Optical properties and cooling technologies in crystalline materials #Quantum optics and atomic interactions #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/9908043
Nordita preprint NORDITA-1999/46 CM
arxiv created 1999/08/03 · openalex publication_date 1999/08/03 · arxiv updated 2009/11/30 · openalex created_date 2019/10/10 · openalex updated_date 2026/07/28
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.