2-DIMENSIONAL CHAIN FOLDING RANDOM ENERGY INTERACTION

An extended version of the Zwanzig-Lauritzen model, in which each fold contributes with a random energy, is discussed. By means of the repli ca trick, an exact solution is achieved for a variant of the general m odel proposed. Its solution shows that the second order phase transiti on between the folded and the extended phase, exhibited by the Zwanzig -Lauritzen model, disappears when a random energy term - depending onl y on the number of folds of the chain - is added.