Modelling the nonlinear gravitational clustering in the expanding universe

Padmanabhan, T. (1996) Modelling the nonlinear gravitational clustering in the expanding universe Monthly Notices of the Royal Astronomical Society, 278 . L29-L33. ISSN 0035-8711

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Abstract

The gravitational clustering of collisionless particles in an expanding universe is modelled using some simple physical ideas. I show that it is indeed possible to understand the nonlinear clustering in terms of three well defined regimes: (1) linear regime (2) quasilinear regime which is dominated by scale-invariant radial infall and (3) nonlinear regime dominated by nonradial motions and mergers. Modelling each of these regimes separately I show how the nonlinear two point correlation function can be related to the linear correlation function in heirarchical models. This analysis leads to results which are in good agreement with numerical simulations thereby providing an explanation for numerical results. The ideas presented here will also serve as a powerful anlytical tool to investigate nonlinear clustering in different models. Several implications of the result are discussed.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Cosmology; Theory; Dark Matter; Large Scale Structure of Universe
ID Code:72490
Deposited On:29 Nov 2011 05:34
Last Modified:29 Nov 2011 05:34

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