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Modeling Gravitational Clustering without Computing Gravitational Force | | Sergei F. Shandarin
; B.S. Sathyaprakash
; | | Date: |
14 May 1996 | | Journal: | Astrophys.J.Lett. 467 (1996) L25-L28 | | Abstract: | The large-scale structure in the Universe is believed to arise out of small random density perturbations generated in the very early Universe, that are amplified by gravity. Large and usually intricate N-body simulations are typically employed to model the complex nonlinear dynamics in a self gravitating medium. We suggest a very simple model which 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 {it generalized} linear momentum. The model demonstrates that the overall appearance of large-scale structure in the Universe is explicitly determined by the initial velocity field and it reveals the most significant large-scale effects of gravity on the formation of structure. | | Source: | arXiv, astro-ph/9605067 | | Services: | Forum | Review | PDF | Favorites | |
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