TY  - JOUR
AU  - Wagner, C.
AU  - Verde, L.
AU  - Boubekeur, L.
PY  - 2010
DA  - 2010//
TI  - N-body simulations with generic non-Gaussian initial conditions I: power spectrum and halo mass function
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 022
EP  - 24pp
VL  - 10
IS  - 10
PB  - Iop Publishing Ltd
KW  - power spectrum
KW  - cosmological simulations
KW  - initial conditions and eternal universe
KW  - galaxy clusters
AB  - 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.
SN  - 1475-7516
UR  - http://arxiv.org/abs/arXiv:1006.5793
UR  - https://doi.org/10.1088/1475-7516/2010/10/022
DO  - 10.1088/1475-7516/2010/10/022
LA  - English
N1  - ISI:000283577600013
ID  - Wagner_etal2010
ER  -