Are there Local Minima in the Magnetic Monopole Potential in Compact   QED?
  We investigate the influence of the granularity of the lattice on the potential between monopoles. Using the flux definition of monopoles we introduce their centers of mass and are able to realize continuous shifts of the monopole positions. We find periodic deviations from the $1/r$-behavior of the monopole-antimonopole potential leading to local extrema. We suppose that these meta-stabilities may influence the order of the phase transition in compact QED. 
H. Bozkaya, M. Faber, P. Koppensteiner, M. Pitschmann