Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/127527
Title: N-body simulations with generic non-Gaussian initial conditions I: Power Spectrum and halo mass function
Author: Wagner, Christian
Verde, Licia
Boubekeur, Lotf
Keywords: Cosmologia
Astrofísica
Cosmology
Astrophysics
Issue Date: 2010
Publisher: Institute of Physics (IOP)
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). We plan to make the simulations outputs available to the community via the non-Gaussian simulations comparison project web site http://icc.ub.edu/~liciaverde/NGSCP.html.
Note: Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2010/10/022
It is part of: Journal of Cosmology and Astroparticle Physics, 2010, vol. 2010, num. 022
URI: http://hdl.handle.net/2445/127527
Related resource: https://doi.org/10.1088/1475-7516/2010/10/022
ISSN: 1475-7516
Appears in Collections:Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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