Geodesic
Calculation of the correlation functions of a~nonideal Bose gas by the method of collective variables
Teoretičeskaâ i matematičeskaâ fizika, Tome 26 (1976) no. 1, pp. 77-95

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The method of collective variables is used to investigate the properties of a nonideal Bose system near absolute zero temperature. It is shown that the method developed previously by the author for constructing correlation functions enables one to extend the method of collective variables to systems with hard core interaction. The time dependence of the correlation functions is investigated for large and small values of the time $t$. 
@article{TMF_1976_26_1_a6,
     author = {Yu. A. Tserkovnikov},
     title = {Calculation of the correlation functions of a~nonideal {Bose} gas by the method of collective variables},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {77--95},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1976_26_1_a6/}
}
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Yu. A. Tserkovnikov. Calculation of the correlation functions of a~nonideal Bose gas by the method of collective variables. Teoretičeskaâ i matematičeskaâ fizika, Tome 26 (1976) no. 1, pp. 77-95. http://geodesic.mathdoc.fr/item/TMF_1976_26_1_a6/