Gravitational clustering: an overview
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Publication:5118772
DOI10.1063/1.2839121zbMATH Open1454.83012arXiv0806.2560OpenAlexW3103248402MaRDI QIDQ5118772
Publication date: 26 August 2020
Published in: AIP Conference Proceedings (Search for Journal in Brave)
Abstract: We discuss the differences and analogies of gravitational clustering in finite and infinite systems. The process of collective, or violent, relaxation leading to the formation of quasi-stationary states is one of the distinguished features in the dynamics of self-gravitating systems. This occurs, in different conditions, both in a finite than in an infinite system, the latter embedded in a static or in an expanding background. We then discuss, by considering some simple and paradigmatic examples, the problems related to the definition of a mean-field approach to gravitational clustering, focusing on role of discrete fluctuations. The effect of these fluctuations is a basic issue to be clarified to establish the range of scales and times in which a collision-less approximation may describe the evolution of a self-gravitating system and for the theoretical modeling of the non-linear phase.
Full work available at URL: https://arxiv.org/abs/0806.2560
Galactic and stellar dynamics (85A05) Equations of motion in general relativity and gravitational theory (83C10) Dark matter and dark energy (83C56)
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