Clustering in gravitating N-body systems
Dipartimento di Fisica, Università di Roma “La Sapienza” - Italy
2 INFM, Unità di Ricerca di Roma “La Sapienza” - Italy
Accepted: 6 November 2001
We study gravitational clustering of mass points in three dimensions with random initial positions and periodic boundary conditions (no expansion) by numerical simulations. Correlation properties are well-defined in the system and a sort of thermodynamic limit can be defined for the transient regime of clustering. Structure formation proceeds along two paths: i) fluid-like evolution of density perturbations at large scales and ii) shift of the granular (non-fluid) properties from small to large scales. The latter mechanism finally dominates at all scales and it is responsible for the self-similar characteristics of the clustering.
PACS: 05.20.-y – Classical statistical mechanics / 45.50.Jf – Few- and many-body systems / 45.50.-j – Dynamics and kinematics of a particle and a system of particles
© EDP Sciences, 2002