Three–phonon scattering and the initial relaxation of a phonon pulse injected into He II

Adamenko, I. N.; Nemchenko, K. E.; Жуков, А. В.; Tucker, M. A. H.; Wyatt, A. F. G.

doi:10.1016/s0921-4526(99)01982-1

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Cited by 7 publications

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“…( 36). The curvature of the spectrum determines what type of quasiparticle interactions that mainly contribute to the relaxation processes [13,14]. Hierarchy of the interaction times can lead to the very interesting processes of energy exchange between di¡erent regions of the spectrum, like it occurs in super£uid helium [14].…”

Section: Diagonalizationmentioning

confidence: 99%

Quasiparticle Spectrum for a Dilute Bose-gas in an Inhomogeneous External Field

Жуков¹

2002

Phys. Scr.

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The paper deals with the properties of Bose-gases in inhomogeneous external fields at very low temperatures, when a Bose–Einstein condensation occurs. This particularly refers to trapped alkali gases, which are of great experimental and theoretical interest. The system is considered here in the frame of the developed approach close to the Bogoliubov one with necessary modifications. In particular the generalization of Bogoliubov transformations made it possible to find the spectrum of quasiparticles (low-energy thermal excitations) with account of purely quantum parts of ψ-operators in first order.

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Section: Diagonalizationmentioning

confidence: 99%