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Linear spin waves in a trapped Bose gas
T. Nikuni, J. E. Williams, C. W. Clark
An ultra-cold Bose gas of two-level atoms can be thought of as a spin-1/2 Bose gas. It supports spin-wave collective modes due to the exchange mean field. Such collective spin osci…
Longitudinal spin waves in a dilute Bose gas
J. E. Williams, T. Nikuni, Charles W. Clark
We present a kinetic theory for a dilute noncondensed Bose gas of two-level atoms that predicts the transient spin segregation observed in a recent experiment. The underlying mecha…
Dynamical instability of a condensate induced by a rotating thermal gas
J. E. Williams, E. Zaremba, B. Jackson +2
We study surface modes of the condensate in the presence of a rotating thermal cloud in an axisymmetric trap. By considering collisions that transfer atoms between the condensate a…
Two-Fluid Hydrodynamics in Trapped Bose Gases and in Superfluid Helium
Allan Griffin, Tetsuro Nikuni
A review is given of recent theoretical work on the superfluid dynamics of trapped Bose gases at finite temperatures, where there is a significant fraction of non-condensate atoms.…
Two-fluid dynamics for a Bose-Einstein condensate out of local equilibrium with the non-condensate
T. Nikuni, E. Zaremba, A. Griffin
We extend our recent work on the two-fluid hydrodynamics of a Bose-condensed gas by including collisions involving both condensate and non-condensate atoms. These collisions are es…
Hydrodynamic modes and pulse propagation in a cylindrical Bose gas above the Bose-Einstein transition
T. Nikuni, A. Griffin
We study hydrodynamic oscillations of a cylindrical Bose gas above the Bose-Einstein transition temperature using the hydrodynamic equations derived by Griffin, Wu and Stringari. T…