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Open Access item N-body simulations with generic non-Gaussian initial conditions I: power spectrum and halo mass function

Authors:Wagner, Christian
Verde, Licia
Boubekeur, Lotfi
Issue Date:Oct-2010
Publisher:Institute of Physics Publishing
Citation:Journal of Cosmology and Astroparticle Physics (JCAP) 10: 022 (2010)
Abstract:We address the issue of setting up generic non-Gaussian initial conditions for N-body simulations. We consider inflationary-motivated primordial non-Gaussianity where the perturbations in the Bardeen potential are given by a dominant Gaussian part plus a non-Gaussian part specified by its bispectrum. The approach we explore here is suitable for any bispectrum, i.e. it does not have to be of the so-called separable or factorizable form. The procedure of generating a non-Gaussian field with a given bispectrum (and a given power spectrum for the Gaussian component) is not univocal, and care must be taken so that higher-order corrections do not leave a too large signature on the power spectrum. This is so far a limiting factor of our approach. We then run N-body simulations for the most popular inflationary-motivated non-Gaussian shapes. The halo mass function and the non-linear power spectrum agree with theoretical analytical approximations proposed in the literature, even if they were so far developed and tested only for a particular shape (the local one).
Publisher version (URL):http://dx.doi.org/10.1088/1475-7516/2010/10/022
URI:http://hdl.handle.net/10261/33081
ISSN:1475-7516
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