Abstract
It will be given analytical and numerical evidence supporting that the X-Y model yields an extensive, i.e., proportional to the number of degrees of freedom N, internal energy U for any value of the interaction range.
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Toral, R. On the Nonextensivity of the Long Range X-Y Model. Journal of Statistical Physics 114, 1393–1398 (2004). https://doi.org/10.1023/B:JOSS.0000013963.16180.a3
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DOI: https://doi.org/10.1023/B:JOSS.0000013963.16180.a3