Abstract
In quite generalN-component ferromagnetic spin systems, it is proved that an arbitrary correlation function is bounded by the corresponding correlation function of a Gaussian model. The bound is useful for the analysis of high-temperature behavior of the system. Similar bounds for truncated correlation functions are also obtained for a class of single-component spin systems.
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Tasaki, H. Gaussian bounds for correlations in lattice spin systems. J Stat Phys 38, 873–890 (1985). https://doi.org/10.1007/BF01010421
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DOI: https://doi.org/10.1007/BF01010421