A non-perturbative analysis of symmetry breaking in two-dimensional phi^4 theory using periodic field methods
arXiv:hep-th/9906189 · doi:10.1016/S0370-2693(99)01341-6
Abstract
We describe the generalization of spherical field theory to other modal expansion methods. The main approach remains the same, to reduce a d-dimensional field theory into a set of coupled one-dimensional systems. The method we discuss here uses an expansion with respect to periodic-box modes. We apply the method to phi^4 theory in two dimensions and compute the critical coupling and critical exponents. We compare with lattice results and predictions via universality and the two-dimensional Ising model.
12 pages, 4 figures, version to appear in Physics Letters B