Correlation Inequalities for Classical and Quantum XY Models

  • Costanza BenassiEmail author
  • Benjamin Lees
  • Daniel Ueltschi
Part of the Springer INdAM Series book series (SINDAMS, volume 18)


We review correlation inequalities of truncated functions for the classical and quantum XY models. A consequence is that the critical temperature of the XY model is necessarily smaller than that of the Ising model, in both the classical and quantum cases. We also discuss an explicit lower bound on the critical temperature of the quantum XY model.


Classical XY model Correlation inequalities Lattice systems Quantum XY model Spin systems 



The authors thank S. Bachmann and C.E. Pfister for useful comments.


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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Costanza Benassi
    • 1
    Email author
  • Benjamin Lees
    • 2
  • Daniel Ueltschi
    • 1
  1. 1.Department of MathematicsUniversity of WarwickCoventryUK
  2. 2.Department of MathematicsUniversity of GothenburgGothenburgSweden

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