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Gravitational dynamics of an infinite shuffled lattice: early time evolution and universality of non-linear correlations
Baertschiger T., Joyce M., Labini F., Marcos B.
Physical Review E 77 (2008) 5 - http://hal.in2p3.fr/in2p3-00282372
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Physique/Matière Condensée/Mécanique statistique
Gravitational dynamics of an infinite shuffled lattice: early time evolution and universality of non-linear correlations
T. Baertschiger, M. Joyce1, F. Labini, B. Marcos
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
http://www-lpnhep.in2p3.fr
CNRS : UMR7585 – IN2P3 – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot
Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05
France
In two recent articles a detailed study has been presented of the out of equilibrium dynamics of an infinite system of self-gravitating points initially located on a randomly perturbed lattice. In this article we extend the treatment of the early time phase during which strong non-linear correlations first develop, prior to the onset of ``self-similar'' scaling in the two point correlation function. We establish more directly, using appropriate modifications of the numerical integration, that the development of these correlations can be well described by an approximation of the evolution in two phases: a first perturbative phase in which particles' displacements are small compared to the lattice spacing, and a subsequent phase in which particles interact only with their nearest neighbor. For the range of initial amplitudes considered we show that the first phase can be well approximated as a transformation of the perturbed lattice configuration into a Poisson distribution at the relevant scales. This appears to explain the ``universality'' of the spatial dependence of the asymptotic non-linear clustering observed from both shuffled lattice and Poisson initial conditions.

Articles dans des revues avec comité de lecture
2008
Physical Review E (Phys Rev E Stat Nonlin Soft Matter Phys)
Publisher American Physical Society
ISSN 1539-3755 
77
5
© 2008 The American Physical Society

11 pages, 11 figures, shortened introductory sections and other minor modifications, version to appear in Phys. Rev. E
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0711.2219