Quasi-stationary states and incomplete violent relaxation in systems   with long-range interactions
  We discuss the nature of quasi-stationary states (QSS) with non-Boltzmannian distribution in systems with long-range interactions in relation with a process of incomplete violent relaxation based on the Vlasov equation. We discuss several attempts to characterize these QSS and explain why their prediction is difficult in general. 
P.H. Chavanis