Investigation of the Critical Behavior of the Critical Point of the Z2   Gauge Lattice
  We investigate, through Monte-Carlo simulations, the nature of the second order point in a $Z_2$ (Bosonic) + $Z_2$ gauge theory in four dimensions. Detailed analysis of the critical exponents point to the Ising universality class. Relevancy to extended models and possible Non-Gaussian behavior is discussed. 
Y. Blum, P.K. Coyle, S. Elitzur, E. Rabinovici, S. Solomon, H.   Rubinstein