Modeling Gravitational Clustering without Computing Gravitational Force
Abstract
The largescale structure in the universe is believed to have arisen out of small, random density perturbations generated in the very early universe that are amplified by gravity. Large and usually intricate Nbody simulations are typically employed to model the complex nonlinear dynamics in a selfgravitating medium. We suggest a very simple model that predicts, on large scales, the correct density and velocity distributions. The model does not involve an explicit computation of the gravitational force. It is based on a simple transformation of the variables and local conservation laws of mass and generalized linear momentum. The model demonstrates that the overall appearance of largescale structure in the universe is explicitly determined by the initial velocity field, and it reveals the most significant largescale effects of gravity on the formation of structure.
 Publication:

The Astrophysical Journal
 Pub Date:
 August 1996
 DOI:
 10.1086/310186
 arXiv:
 arXiv:astroph/9605067
 Bibcode:
 1996ApJ...467L..25S
 Keywords:

 COSMOLOGY: THEORY;
 COSMOLOGY: LARGESCALE STRUCTURE OF UNIVERSE;
 Astrophysics
 EPrint:
 Latex file (needs, epsf.sty, aaspp4.sty)