Comment on "Collective excitations of a degenerate gas at the BEC-BCS crossover"

Details Comment on "Collective excitations of a degenerate gas at the BEC-BCS crossover" Comment on "Collective excitations of a degenerate gas at the BEC-BCS crossover"

2004-05-07

arxiv.org/abs/cond-mat/0405146v2

Phys.Rev.Lett.93,138901(2004)

Physics

Condensed Matter

Soft Condensed Matter

2 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.93.138901

Very recent experiments have studied for the first time collective excitations of an ultracold $^6$Li gas covering in particular the BEC-BCS crossover domain. We point out that the results for the axial mode, through hydrodynamics, give direct access to the (3D) equation of state of the strongly interacting gas, mostly near the unitarity limit. On the other hand the surprising results found for the radial mode are actually not necessarily in contradiction with the expectations from superfluid hydrodynamics.

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