Percolation and lack of self-averaging in a frustrated evolutionary   model
  We present a stochastic evolutionary model obtained through a perturbation of Kauffman's maximally rugged model, which is recovered as a special case. Our main results are: (i) existence of a percolation-like phase transition in the finite phase space case; (ii) existence of non self-averaging effects in the thermodynamic limit. Lack of self-averaging emerges from a fragmentation of the space of all possible evolutions, analogous to that of a geometrically broken object. Thus the model turns out to be exactly solvable in the thermodynamic limit. 
Andrea De Martino and Andrea Giansanti (Dip. Fisica, Univ. di Roma "La   Sapienza", Roma, Italy)