Geodesic
Nonequal-time current correlation function in~a~one-dimensional Bose gas
Teoretičeskaâ i matematičeskaâ fizika, Tome 82 (1990) no. 3, pp. 389-401

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The nonequal-time current correlation function in a one-dimensional Bose gas is calculated in the first order of perturbation theory. It is shown that the form factor of the particle number operator is proportional to a fractional power of the gas volume. 
@article{TMF_1990_82_3_a6,
     author = {N. A. Slavnov},
     title = {Nonequal-time current correlation function in~a~one-dimensional {Bose} gas},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {389--401},
     publisher = {mathdoc},
     volume = {82},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1990_82_3_a6/}
}
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N. A. Slavnov. Nonequal-time current correlation function in~a~one-dimensional Bose gas. Teoretičeskaâ i matematičeskaâ fizika, Tome 82 (1990) no. 3, pp. 389-401. http://geodesic.mathdoc.fr/item/TMF_1990_82_3_a6/