Geodesic
Asymptotically exact solution of the generalized Dicke model
Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 1, pp. 20-30

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The exact solution for the generalized Dicke model is obtained by using a modification of the method of N. N. Bogoliubov (Jr.). Thermodynamics of the boson and spin subsystems is studied. It is shown that the initial system containing interaction with a boson field is thermodynamically equivalent to an anisotropic $X$–$Y$-model with infinitely long range of interaction. 
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     title = {Asymptotically exact solution of the generalized {Dicke} model},
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I. G. Brankov; V. A. Zagrebnov; N. S. Tonchev. Asymptotically exact solution of the generalized Dicke model. Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 1, pp. 20-30. http://geodesic.mathdoc.fr/item/TMF_1975_22_1_a1/