Dynamics of Bose-Einstein Condensate and Two-Fluid Hydrodynamics
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概要
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Dynamics of Bose-Einstein Condensate (BEC) is treated on the basis of the Mori theory of non-equilibrium thermodyanamics in the hydrodynamic region. The local values of conserved quantities, i. e., particle number, momentum and energy, and Ψ(x), the wave function of BEC, are adopted as a complete set of macrovariables. The set of equations of motion thus obtained is useful to describe the dynamical behavior of superfluid ^4He near the λ-point. The density of condensate is not conserved, but its equation of motion has the term which is relevant to the renormalization of condensate to superfluid. The expression for the relaxation time τ_c of condensate density to its local-equilibrium is given and it is shown that the anomaly of τ_c near the λ-point coincides with the behavior experimentally determined in n^^-_c(∂μ_c/∂n_c) is proportional to (T_λ-T) as in the Landau theory of phase transition. In case ω_τ_c≪1 the ordinary two-fluid hydrodynamics is derived by eliminating the motion of condensate density.
- 理論物理学刊行会の論文
- 1976-12-25
著者
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Miyake Kazumasa
Department Of Internal Medicine Division Of Gastroenterology Nippon Medical School
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Yamada Kazuo
Department Of Biochemistry Faculty Of Medicine Shimane University
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Yamada Kazuo
Department Of Architecture Faculty Of Engineering Aichi Institute Of Technoligy
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