Universality along a line of critical points. The Ashkin-Teller model
Gesualdo Delfino


Abstract
The two-dimensional Ashkin-Teller model provides the simplest example of a statistical system exhibiting a line of critical points along which the critical exponents vary continously. We discuss the field theoretical description of the scaling limit in terms of the sine-Gordon model and show how the universal amplitude ratios can be computed non-perturbatively along the whole critical line.

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Elenco dei partecipanti al convegno di Bari.

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