Damping of hydrodynamic modes in a trapped Bose gas above the Bose-Einstein transition temperature

被引:42
作者
Kavoulakis, GM
Pethick, CJ
Smith, H
机构
[1] NORDITA, DK-2100 Copenhagen O, Denmark
[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[3] HC Orsted Inst, Orsted Lab, DK-2100 Copenhagen O, Denmark
来源
PHYSICAL REVIEW A | 1998年 / 57卷 / 04期
关键词
D O I
10.1103/PhysRevA.57.2938
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We calculate the damping of low-lying collective modes of a trapped Bose gas in the hydrodynamic regime, and show that this comes solely from the shear viscosity, since the contributions from bulk viscosity and thermal conduction vanish. The hydrodynamic expression for the damping diverges due to the failure of hydrodynamics in the outer parts of the cloud, and we take this into account by a physically motivated cutoff procedure. Our analysis of available experimental data indicates that higher densities than have yet been achieved are necessary for investigating hydrodynamic modes above the Bose-Einstein transition temperature.
引用
收藏
页码:2938 / 2941
页数:4
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