Gerhard Keller and Carlangelo Liverani 

Map Lattices coupled by collisions.
          
  
                           ABSTRACT
                                           
We introduce a new coupled map lattice model in which the weak interaction
  takes place via rare ``collisions''. By ``collision'' we mean a strong
  (possibly discontinuous) change in the system. For such models we prove
  uniqueness of the SRB measure and exponential space-time decay of
  correlations.