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On quantum systems in thermal contact

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Abstract

It is shown that under rather general conditions two K.M.S. states ω1 and ω2 of systemsS 1 andS 2, respectively, can be simultaneously extended to a K.M.S. state ω of a system composed ofS 1 andS 2, provided both systems have equal temperatures. This result gives further support to the conjecture that K.M.S. states are equilibrium states. In the second part, a model of thermal coupling is constructed which satisfies the assumptions of the first part, thereby showing that the result is also valid in the interesting case of systemsS 1 andS 2 in thermal contact.

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Authors and Affiliations

  1. Institut für Theoretische Physik der Universität Göttingen, Germany

    H. Roos

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  1. H. Roos
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Roos, H. On quantum systems in thermal contact. Commun.Math. Phys. 26, 149–168 (1972). https://doi.org/10.1007/BF01645701

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  • DOI: https://doi.org/10.1007/BF01645701

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