Dynamique gravitationnelle multi-échelle : formation et évolution des systèmes auto-gravitants non isolés

Abstract : The purpose of this thesis is to study the formation and properties of self-gravitating systems, insulated and uninsulated using numerical simulations of gravitational collapse of body systems. In the first part, we summarize the main analytical results concerning the system of equations coupled collisionless Boltzmann - Poisson system that models the self-gravitating collisionless, and their extension in the presence of an external field, and some analytical solutions . In a second part, we present codes that we used and we introduce the concepts of parallel and distributed computing, some elements have been parallelized using the message exchange library MPI Finally, in a final section, we present the various results of our simulations and their analysis. The first of them concerns the further study of the initial conditions needed to trigger instabilities Antonov, and the study of the internal dynamics of self-gravitating isolated systems. The second part concerns the study of these systems in orbits in an external potential, to study its influence on the formation process of self-gravitating systems by gravitational collapse.
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Submitted on : Monday, May 11, 2009 - 8:00:00 AM
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Nicolas Kielbasiewicz. Dynamique gravitationnelle multi-échelle : formation et évolution des systèmes auto-gravitants non isolés. Mathématiques [math]. ENSTA ParisTech, 2009. Français. ⟨pastel-00005096⟩

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