GENERALIZING THE STAIRCASE MODELS

Systems of integral equations are proposed which generalise those previously encountered in connection with the so-called staircase models. Under the assumption that these equations describe the finite-size effects of relativistic field theories via the thermodynamic Bethe ansatz, analytical and numerical evidence is given for the existence of a variety of new roaming renormalisation group trajectories. For each positive integer k and s = 0,..., k - 1, there is a one-parameter family of trajectories, passing close by the coset conformal field theories G(k) X G(nk+s)/G((n+1)k+s) before finally flowing to a massive theory for s = 0, or to another coset model for s not-equal 0.