Geodesic
Calculation of equilibrium mean values in a system of molecules interacting with a radiation field
Teoretičeskaâ i matematičeskaâ fizika, Tome 32 (1977) no. 3, pp. 410-415 Cet article a éte moissonné depuis la source Math-Net.Ru

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Method of calculating the temperature averages of collective variables in the system of $N$ many-level moleculi interacting with radiation field is suggested. Decomposition of the space of states of the moleculi over the subspaces of irreducible representations of the group $U(n)$ is used. Calculations are performed in the basis of the coherent states of the unitary group, which are the quasiclassical states of the radiators in the limit $N\to\infty$. An unexpected statistical interpretation of some group-theoretical quantities is obtained. The method proposed for calculating the averages is used for determining the conditions of the phase transition into spontaneous coherent state. 
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     title = {Calculation of equilibrium mean values in a~system of molecules interacting with a~radiation field},
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}
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V. V. Zverev. Calculation of equilibrium mean values in a system of molecules interacting with a radiation field. Teoretičeskaâ i matematičeskaâ fizika, Tome 32 (1977) no. 3, pp. 410-415. http://geodesic.mathdoc.fr/item/TMF_1977_32_3_a11/

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