出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：It was recently pointed out that simple scaling properties of Polyakov correlation functions of
gauge systems in the confining phase suggest that the ratios of k-string tensions in the low temperature
region is constant up to terms of order T3. Here we argue that, at least in a three-dimensional
Z4 gauge model, the above ratios are constant in the whole confining phase. This result is obtained
by combining numerical experiments with known exact results on the mass spectrum of
an integrable two-dimensional spin model describing the infrared behaviour of the gauge system
near the deconfining transition.
