The theory of the superfluid Bose liquid

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Physics of Particles and Nuclei

OSTI ID:115025

Krasil`nikov, V V; Peletminskii, S V ^[1]

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1. Khar`kov Physico-Technical Inst. (Ukraine)

A self-consistent theory of the superfluid Bose liquid is constructed on the basis of a generalization of the Fermi-liquid approach to superfluidity. The semiphenomenological theory of the superfluid Bose liquid developed here is based on specifying the system energy as a functional of both the quasiparticle condensate amplitudes and the normal and anomalous correlation functions of the above-condensate quasiparticles. The expression found for the entropy is used together with the variational principle to obtain the self-consistency equations for the equilibrium correlation functions and the quasiparticle condensate amplitudes. Collisionless kinetic equations for the normal and anomalous correlation functions and the condensate amplitudes are formulated. These equations are used to study the oscillations of a spatially homogeneous Bose liquid with the condition that all the particles are in the condensate. The relation between the formalism developed here and the results obtained by Bogolyubov for a weakly nonideal Bose gas is traced, and the equations for two-liquid ideal hydrodynamics are constructed without assuming Galilean invariance of the energy functional. 54 refs.

• OSTI ID: 115025
• Journal Information: Physics of Particles and Nuclei, Journal Name: Physics of Particles and Nuclei Journal Issue: 2 Vol. 24; ISSN PPNUER; ISSN 1063-7796
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BOSE-EINSTEIN CONDENSATION
BOSE-EINSTEIN GAS
CORRELATION FUNCTIONS
ENTROPY
FERMI GAS
HIGH-TC SUPERCONDUCTORS
QUASI PARTICLES
SUPERFLUIDITY