Comment on "Collective excitations of a degenerate gas at the BEC-BCS crossover"
R. Combescot, X. Leyronas
Abstract
Very recent experiments have studied for the first time collective excitations of an ultracold 6Li 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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