Tests of Conformal Invariance in Randomness Induced Second-Order Phase Transitions

Abstract

The conformal covariance of correlation functions is checked in the second-order transition induced by random bonds in the two-dimensional 8-state Potts model. The decay of correlations is obtained {\it via} transfer matrix calculations in a cylinder geometry, and large-scale Monte Carlo simulations give access to the correlations and the profiles inside a square with free or fixed boundary conditions, respectively. In both geometries, conformal transformations constrain the form of the spatial dependence, leading to accurate determinations of the order parameter scaling index in good agreement with previous independent determinations obtained through standard techniques. The energy density exponent is also computed.

LaTeX file with Revtex, 4 pages, 4 eps figures, to appear in Phys. Rev. E, minor corrections

References in corpus (5)

• Critical Behavior of Random Bond Potts Models
• Critical Behaviour of Random Bond Potts Models: A Transfer Matrix Study
• Finite-Size Scaling Study of the Surface and Bulk Critical Behavior in the Random-Bond 8-state Potts Model
• Weak Randomness for large q-State Potts models in Two Dimensions
• Logarithmic corrections to gap scaling in random-bond Ising strips

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