Abstract
We consider excitations that exist, in addition to phonons, in the ideal Bose gas at zero temperature. These excitations are vortex rings whose energy spectrum is similar to the roton one in liquid helium.
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Belyaev, S.T. Vortex rings in Bose gas. J. Exp. Theor. Phys. 122, 957–959 (2016). https://doi.org/10.1134/S1063776116060029
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DOI: https://doi.org/10.1134/S1063776116060029