✦ LIBER ✦

Group theoretic approach to the screened Coulomb problem: Adam Bechler, Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 180 KB
Volume: 106
Category: Article
ISSN: 0003-4916
DOI: 10.1016/0003-4916(77)90326-8

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✦ Synopsis

We study the thermodynamical property of a Dicke model with classical spin. As in the quantum case, the model exhibits a phase transition associated with the spontaneous breaking of the gauge symmetry. We calculate the thermodynamical equilibrium photon state in a relatively simple way both at any temperature and in the presence of an external field. We emphasize that the phase transition is connected with the existence of an observable phase operator below the critical temperature. Some Calculations for I'C in the N-Particle Model.

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