QED_3 on a space-time lattice: a comparison between compact and   noncompact formulation
  Quantum electrodynamics in a (2+1)-dimensional space-time has been object of studies both as effective theory for the pseudogap phase of high-T_c superconductors and for the theoretical investigation of mechanisms of confinement in presence of matter fields. We discretize the theory using both compact and noncompact formulations, analyze the behavior of the chiral condensate and of the monopole density and compare them. Finally we draw some conclusions about the possible equivalence of the two lattice formulations. 
Roberto Fiore, Pietro Giudice, Domenico Giuliano, Donatella   Marmottini, Alessandro Papa, Pasquale Sodano