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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: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Publicacions de projectes de recerca finançats per la UE |
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