%0 Journal Article
%T N-body simulations with generic non-Gaussian initial conditions I: power spectrum and halo mass function
%A Wagner, C.
%A Verde, L.
%A Boubekeur, L.
%J Journal of Cosmology and Astroparticle Physics
%D 2010
%V 10
%N 10
%I Iop Publishing Ltd
%@ 1475-7516
%G English
%F Wagner_etal2010
%O ISI:000283577600013
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=339), last updated on Tue, 22 Mar 2011 10:19:41 +0000
%X 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). We plan to make the simulations outputs available to the community via the non-Gaussian simulations comparison project web site http://icc.ub.edu/similar to liciaverde/NGSCP.html.
%K power spectrum
%K cosmological simulations
%K initial conditions and eternal universe
%K galaxy clusters
%R 10.1088/1475-7516/2010/10/022
%U http://arxiv.org/abs/arXiv:1006.5793
%U https://doi.org/10.1088/1475-7516/2010/10/022
%P 022-24pp