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Purely self-gravitating systems of point particles have been extensivelystudied in astrophysics and cosmology, mainly through numerical simulations,but understanding of their dynamics still remains extremely limited. Wedescribe here results of a detailed study of a simple class of coldquasi-uniform initial conditions, for both finite open systems and infinitesystems. These examples illustrate well the qualitative features of the quitedifferent dynamics observed in each case, and also clarify the relation betweenthem. In the finite case our study highlights the potential importance ofenergy and mass ejection prior to virialization, a phenomenon which has beenpreviously overlooked. We discuss in both cases the validity of a mean-fieldVlasov-Poisson description of the dynamics observed, and specifically thequestion of how particle number should be extrapolated to test for it.

Dynamics of finite and infinite self-gravitating systems with cold quasi-uniform initial conditions