EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 385/3 Article
Free access article

Issue A&A
Volume 385, Number 3, April III 2002
Page(s) 761 - 767
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20020187



A&A 385, 761-767 (2002)
DOI: 10.1051/0004-6361:20020187

Transients from Zel'dovich initial conditions

P. Valageas

Service de Physique Théorique, CEN Saclay, 91191 Gif-sur-Yvette, France

(Received 5 December 2001 / Accepted 29 January 2002 )

Abstract
We investigate the error implied by the use of the Zel'dovich approximation to set up the initial conditions at a finite redshift $z_{\rm i}$ in numerical simulations. Using a steepest-descent method developed in a previous work (Valageas 2002a) we derive the probability distribution ${\cal P}(\delta_{R})$ of the density contrast in the quasi-linear regime. This also provides its dependence on the redshift $z_{\rm i}$ at which the simulation is started. Thus, we find that the discrepancy with the exact pdf (defined by the limit $z_{\rm i}\rightarrow \infty$) is negligible after the scale factor has grown by a factor $a/a_{\rm i}\ga 5$, for scales which were initially within the linear regime with $\sigma_{\rm i} \la 0.1$. This shows that the use of the Zel'dovich approximation to implement the initial conditions is sufficient for practical purposes since these are not very severe constraints.


Key words: cosmology: theory -- large-scale structure of Universe




© ESO 2002


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.