Four spins correlation function of the q states Potts model, for general values of q. Its percolation model limit q → 1

Abstract

Under the assumption that the product of two spin operators decomposes uniquely into the degenerate conformal fields {Φn′,n}, the general expression for the correlation function of four spins is defined for the q states Potts model with q taking general values in the interval 1≤q≤4.The limit of q→1 is considered in detail and the four spin function is obtained for the percolation model.