Two-dimensional field theory with several condensed phases
Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 3, pp. 325-334

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The effective-action method is used to study a two-dimensional theory with four-fermion current-current interaction. A phase transition with respect to the coupling constant from the symmetric to nonsymmetric phase is found. In the different phases, there exist different numbers of Goldstone modes of the Bose excitations as in the anisotropic superfluid phases of ${}^3\operatorname{He}$.
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     author = {N. E. Bogdanova and V. N. Popov},
     title = {Two-dimensional field theory with several condensed phases},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {46},
     number = {3},
     year = {1981},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1981_46_3_a6/}
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N. E. Bogdanova; V. N. Popov. Two-dimensional field theory with several condensed phases. Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 3, pp. 325-334. http://geodesic.mathdoc.fr/item/TMF_1981_46_3_a6/