Abstract
We prove that the expansion in powers of the temperatureT of the correlation functions and the free energy of the plane rotator model on ad-dimensional lattice is asymptotic to all orders inT. The leading term in the expansion is the spin wave approximation and the higher powers are obtained by the usual perturbation series. We also prove the inverse power decay of the pair correlation at low temperatures ford=3.
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Communicated by A. Jaffe
Supported by NSF Grant No. MCS 78-01885
Supported by NSF Grant No. PHY 78-15920
Supported by NSF Grant No. DMR 73-04355
Supported by NSF Grant No. PHY-7825390 A01
On leave from: Institut de Physique Théorique, Université de Louvain, Belgium
Also: Department of Physics
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Bricmont, J., Fontaine, JR., Lebowitz, J.L. et al. Lattice systems with a continuous symmetry. Commun.Math. Phys. 78, 545–566 (1981). https://doi.org/10.1007/BF02046764
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DOI: https://doi.org/10.1007/BF02046764