J. Korean Math. Soc. 2000; 37(4): 579-592
Printed July 1, 2000
Copyright © The Korean Mathematical Society.
S. D. Choi, S. G. Jo, H. I. Kim, H. H. Lee, and H. J. Yoo
Kyungpook National University
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.
Keywords: Quantum unbounded spin systems, superstable interaction, KMS states, entropy, pressure, Gibbs variational principle
MSC numbers: 82B10, 47N50
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