Cold uniform spherical collapse revisited (Contributo in atti di convegno)

Type
Label
  • Cold uniform spherical collapse revisited (Contributo in atti di convegno) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.3462740 (literal)
Alternative label
  • M. Joyce (1); B. Marcos (2); F. Sylos Labini (3,4) (2010)
    Cold uniform spherical collapse revisited
    in Invisible Universe International Conference, Paris, France, 29 June-3 July, 2009
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Joyce (1); B. Marcos (2); F. Sylos Labini (3,4) (literal)
Pagina inizio
  • 955 (literal)
Pagina fine
  • 964 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://proceedings.aip.org/resource/2/apcpcs/1241/1/955_1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • Invisible Universe: Proceedings of the Conference (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#volumeInCollana
  • 1241 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Laboratoire de Physique Nucléaire et de Hautes Energies, UMR 7585, Université Pierre et Marie Curie-Paris 6, 75252 Paris Cedex 05, France 2) Laboratoire J.-A. Dieudonné, UMR 6621, Université de Nice-Sophia Antipolis, Parc Valrose 06108 Nice Cedex 02, France 3) \"E. Fermi\" Center, Via Panisperna 89 A, Compendio del Viminale, I-00184 Rome, Italy 4) ISC-CNR, Via dei Taurini 19, I-00185 Rome, Italy (literal)
Titolo
  • Cold uniform spherical collapse revisited (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 978-0-7354-0789-3 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • edited by J.-M. Alimi and A. Füzfa (literal)
Abstract
  • We report results of a study of the Newtonian dynamics of N self-gravitating particles which start in a quasi-uniform spherical configuration, without initial velocities. These initial conditions would lead to a density singularity at the origin at a finite time when N->?, but this singularity is regulated at any finite N (by the associated density fluctuations). While previous studies have focussed on the behaviour as a function of N of the minimal size reached during the contracting phase, we examine in particular the size and energy of the virialized halo which results. We find the unexpected result that the structure decreases in size as N increases, scaling in proportion to N-1/3, a behaviour which is associated with an ejection of kinetic energy during violent relaxation which grows in propertion to N1/3. This latter scaling may be qualitatively understood, and if it represents the asymptotic behaviour in N implies that this ejected energy is unbounded above. We discuss also tests we have performed which indicate that this ejection is a mean-field phenomenon (i.e. a result of collisionless dynamics). (literal)
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