A first-order transition with power-law singularity in models with   absorbing states
  We study one- and two-dimensional models which undergo a transition between active and absorbing phases. The transition point in these models is of novel type: jump of the order parameter coincides with its power-law singularity. Some arguments supported by Monte Carlo simulations prompted us to predict the exact location of the transition point. Both models possess gauge-like symmetry. 
A.Lipowski (A.Mickiewicz University, Poznan, Poland)