Free energy of an SU(2) monopole-antimonopole pair
  We induce an external ${Z}_2$ monopole-antimonopole pair in an SU(2) lattice gauge system and measure its free energy as a way to probe the vacuum structure. We discuss the motivation and computational methodology of the investigation and illustrate our preliminary results. 
Ch. Hoelbling, C. Rebbi and V. A. Rubakov