Gravitational dynamics of an infinite shuffled lattice: early time evolution and universality of non-linear correlations

Abstract : 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.
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Journal articles
Physical Review E, American Physical Society, 2008, 77, pp.5. <10.1103/PhysRevE.77.051114>


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Submitted on : Tuesday, May 27, 2008 - 2:00:21 PM
Last modification on : Tuesday, May 27, 2008 - 2:00:21 PM

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T. Baertschiger, M. Joyce, F. Labini, B. Marcos. Gravitational dynamics of an infinite shuffled lattice: early time evolution and universality of non-linear correlations. Physical Review E, American Physical Society, 2008, 77, pp.5. <10.1103/PhysRevE.77.051114>. <in2p3-00282372>

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