Geodesic
Theory of a spatially periodic Bose condensate in the weakly nonideal Bose gas model
Teoretičeskaâ i matematičeskaâ fizika, Tome 125 (2000) no. 1, pp. 152-176

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The possibility of constructing the theory of a spatially periodic Bose condensate in the weakly nonideal Bose gas model is studied. The concept of quasi means and the related separated Bose condensate method are used to derive equations for determining the spatially periodic order parameter for zero temperature at which the contribution of quasiparticles to the thermodynamics of the boson system can be neglected. One-period solutions of these equations are found. Questions of thermodynamic stability are considered for a spatially periodic Bose condensate. 
@article{TMF_2000_125_1_a6,
     author = {A. S. Peletminskii and S. V. Peletminskii and Yu. V. Slusarenko},
     title = {Theory of a spatially periodic {Bose} condensate in the weakly nonideal {Bose} gas model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {152--176},
     publisher = {mathdoc},
     volume = {125},
     number = {1},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2000_125_1_a6/}
}
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A. S. Peletminskii; S. V. Peletminskii; Yu. V. Slusarenko. Theory of a spatially periodic Bose condensate in the weakly nonideal Bose gas model. Teoretičeskaâ i matematičeskaâ fizika, Tome 125 (2000) no. 1, pp. 152-176. http://geodesic.mathdoc.fr/item/TMF_2000_125_1_a6/