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2010

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/127527

N-body simulations with generic non-Gaussian initial conditions I: Power Spectrum and halo mass function

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Recurs relacionat

https://doi.org/10.1088/1475-7516/2010/10/022

Resum

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.

Matèries

Cosmologia, Astrofísica

Matèries (anglès)

Cosmology, Astrophysics

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

Citació

WAGNER, Christian, VERDE, Licia and BOUBEKEUR, Lotf. N-body simulations with generic non-Gaussian initial conditions I: Power Spectrum and halo mass function. Journal of Cosmology and Astroparticle Physics. 2010. Vol. 2010, num. 022. ISSN 1475-7516. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/127527

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