Geodesic
On the impossibility of a phase transition to the superradiant state in a thermodynamically equilibrium gauge-invariant system
Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 1, pp. 124-129 
V. A. Slyusarev; R. P. Yankelevich. On the impossibility of a phase transition to the superradiant state in a thermodynamically equilibrium gauge-invariant system. Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 1, pp. 124-129. http://geodesic.mathdoc.fr/item/TMF_1979_40_1_a11/
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     title = {On the impossibility of a~phase transition to the superradiant state in a~thermodynamically equilibrium gauge-invariant system},
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Voir la notice de l'article provenant de la source Math-Net.Ru

A study is made of the possibility of a phase transition to the superradiant state in a system of two-level molecules interacting with the electromagnetic field. In a gauge-invariant system, the interaction contains nonlinear terms, and when these are taken into account the equation for the order parameter has only the trivial solution.

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