Self-organized critical dynamics of a directed bond percolation model
  We study roughening interfaces with a constant slope that become self organized critical by a rule that is similar to that of invasion percolation. The transient and critical dynamical exponents show Galilean invariance. The activity along the interface exhibits non-trivial power law correlations in both space and time. The probability distribution of the activity pattern follows an algebraic relation. 
Subhankar Ray, Tapati Dutta, J. Shamanna