DAMAGE SPREADING IN THE POTTS AND ASHKIN-TELLER MODELS - EXACT RESULTS

Following the approach introduced by Coniglio et al. (1989) for the Ising model, the author studies the relation between damage spreading and thermal properties in the q-state Potts model as well as in the Ashkin-Teller model. The author shows that by selecting appropriate combinations of different types of damage (q(q-1) in the Potts model and 12 in the Ashkin-Teller model), it is possible to find exact relations between damage and thermodynamic functions, like the magnetisation and the pair correlation function.