Geodesic
Three-dimensional Gross–Neveu model in an external magnetic field. I
Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 2, pp. 211-221 
K. G. Klimenko. Three-dimensional Gross–Neveu model in an external magnetic field. I. Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 2, pp. 211-221. http://geodesic.mathdoc.fr/item/TMF_1991_89_2_a4/
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     title = {Three-dimensional {Gross{\textendash}Neveu} model in an~external magnetic {field.~I}},
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Voir la notice de l'article provenant de la source Math-Net.Ru

In the leading order of the $1/N$ expansion, the (2 + l)-dimensional Gross–Neveu model in a constant external magnetic field is considered. It is shown that for $g>0$ ($g$ is the coupling constant) and arbitrarily small value of $H$ the chiral invariance of the model is spontaneously broken. For $g<0$, the symmetry, broken at $H=0$, is not restored at any arbitrarily large value of the external magnetic field.

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