32 citations · 155 across the 25 of their papers we have counts for
6 papers · 1 filter
Quantum Correlations of Ideal Bose and Fermi Gases in the Canonical Ensemble
Kazumasa Tsutsui, Takafumi Kita
We derive an expression for the reduced density matrices of ideal Bose and Fermi gases in the canonical ensemble, which corresponds to the Bloch--De Dominicis (or Wick's) theorem i…
Entropy Change through Rayleigh-Bénard Convective Transition with Rigid Boundaries
Takafumi Kita
The previous investigation on Rayleigh-Bénard convection of a dilute classical gas [T. Kita: J. Phys. Soc. Jpn. {\bf 75} (2006) 124005] is extended to calculate entropy change of t…
Principle of Maximum Entropy Applied to Rayleigh-Bénard Convection
Takafumi Kita
A statistical-mechanical investigation is performed on Rayleigh-Bénard convection of a dilute classical gas starting from the Boltzmann equation. We first present a microscopic der…
Entropy in Nonequilibrium Statistical Mechanics
Takafumi Kita
Entropy in nonequilibrium statistical mechanics is investigated theoretically so as to extend the well-established equilibrium framework to open nonequilibrium systems. We first de…
Conserving Gapless Mean-Field Theory of a Multi-Component Bose-Einstein Condensate
Yoshiyuki Kondo, Takafumi Kita
We develop a mean-field theory for Bose-Einstein condensation of spin-1 atoms with internal degrees of freedom. It is applicable to nonuniform systems at finite temperatures with a…
Conserving Gapless Mean-Field Theory for Weakly Interacting Bose Gases
Takafumi Kita
This paper presents a conserving gapless mean-field theory for weakly interacting Bose gases. We first construct a mean-field Luttinger-Ward thermodynamic functional in terms of th…