Two-fluid dynamics for a Bose-Einstein condensate out of local equilibrium with the non-condensate

Details Two-fluid dynamics for a Bose-Einstein condensate out of local equilibrium with the non-condensate Two-fluid dynamics for a Bose-Einstein condensate out of local equilibrium with the non-condensate

1998-12-18

arxiv.org/abs/cond-mat/9812320v2

Physics

Condensed Matter

4 pages, revtex, 1 postscript figure, Fig.1 has been corrected

Scientific paper

10.1103/PhysRevLett.83.10

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 essential for establishing a state of local thermodynamic equilibrium between the condensate and non-condensate. Our theory is more general than the usual Landau two-fluid theory, to which it reduces in the appropriate limit, in that it allows one to describe situations in which a state of complete local equilibrium between the two components has not been reached. The exchange of atoms between the condensate and non-condensate is associated with a new relaxational mode of the gas.

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