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Theoretical and Mathematical Physics

Hydrodynamics of a superfluid bose liquid with allowance for dissipative processes in a model with weak interaction

S. V. Peletminskiǐ, Alexander I. Sokolovsky, V. S. Shchelokov

Published Jan 1, 1978• 8 citations
Publisher
DOI
10.1007/bf01036471

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In superfluid systems several sound modes can be excited, such as, for example, first and second sound in liquid helium. Here, we excite running and standing waves in a uniform two-dimensional Bose gas and we characterize the propagation of sound in both the superfluid and normal regimes. In the superfluid phase, the measured speed of sound is in good agreement with the prediction of a two-fluid hydrodynamic model, and the weak damping is well explained by the scattering with thermal excitations. In the normal phase we observe a stronger damping, which we attribute to a departure from hydrodynamic behavior.