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Shape of a sound wave in a weakly-perturbed Bose gas
We employ the Gross-Pitaevskii equation to study acoustic emission generated in a uniform Bose gas by a static impurity. The impurity excites a sound-wave packet, which propagates through the gas. We calculate the shape of this wave packet in the limit of long wavelengths, and argue that it is possible to extract properties of the impurity by observing this shape. We illustrate here this possibility for a Bose gas with a trapped impurity atom – an example of a relevant experimental setup.doi:10.21468/scipostphys.10.2.025 fatcat:2h2wzcvm5vbwjafk5dymleeob4