Damage Spreading in a 2D Ising Model with Swendsen-Wang Dynamics
  Damage spreading for 2D Ising cluster dynamics is investigated numerically by using random numbers in a way that conforms with the notion of submitting the two evolving replicas to the same thermal noise. Two damage spreading transitions are found; damage does not spread either at low or high temperatures. We determine the critical exponents at the high-temperature transition point, which seem consistent with directed percolation. 
Haye Hinrichsen (MPIPKS Dresden), Eytan Domany (Weizmann Inst.),   Dietrich Stauffer (Univ. Cologne)