Annotation
The phonon-phonon interaction Hamiltonian is constructed. It is shown that this interaction does not lead to any change in the phonon spectrum, but has а considerable effect on the roton spectrum.
© 2016 Publisher M.V.Lomonosov Moscow State University
Authors
V.А. Zagrebnov
Department of Theoretical Physics
Department of Theoretical Physics
Science News of the Faculty of Physics, Lomonosov Moscow State University
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