• Choi, S.D. ;
  • Jo, S.G. ;
  • Kim, H.I. ;
  • Lee, H.H. ;
  • Yoo, H.J.
  • Published : 2000.07.01


We study the variational principle for quantum unbounded spin systems interacting via superstable and regular interactions. We show that the (weak) KMS state constructed via the thermodynamic limit of finite volume Green's functions satisfies the Gibbs variational equality.


Quantum unbounded spin systems;superstable interaction;KMS states;entropy;pressure;Gibbs variational principle


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