Bernardeau, F. ; Singh, T. P. ; Banerjee, B. ; Chitre, S. M. (1994) The quasi-linear evolution of the density field in models of gravitational instability Monthly Notices of the Royal Astronomical Society, 269 (4). pp. 947-952. ISSN 0035-8711
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Official URL: http://adsabs.harvard.edu/abs/1993astro.ph.11055B
Abstract
Two quasi-linear approximations, the frozen flow approximation (FFA) and the frozen potential approximation (FPA), have been proposed recently for studying the evolution of a collisionless self-gravitating fluid. In the FFA it is assumed that the velocity field remains unchanged from its value obtained from the linear theory whereas in FPA the same approximation is made for the gravitational potential. In this paper we compare these and the older Zel'dovich approximation by calculating the evolution of the density in perturbation theory. In particular we compute the skewness, including the smoothing effects, and the kurtosis for the FFA, FPA and Zel'dovich approximation and compare their relative accuracy.
Item Type: | Article |
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Source: | Copyright of this article belongs to Royal Astronomical Society. |
Keywords: | Galaxies: Clustering; Cosmology: Theory; Large Scale Structure Of Universe |
ID Code: | 5856 |
Deposited On: | 19 Oct 2010 10:27 |
Last Modified: | 16 May 2016 16:18 |
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