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

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.

23 pages, 10 figures

References in corpus (13)

• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Primordial Non-Gaussianities from Inflation Models
• Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
• Enhanced Non-Gaussianity from Excited Initial States
• Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
• The shape of primordial non-Gaussianity and the CMB bispectrum
• Primordial trispectrum from inflation
• Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect
• Primordial non-Gaussianity: large-scale structure signature in the perturbative bias model
• The bispectrum of redshifted 21-cm fluctuations from the dark ages
• The Void Abundance with Non-Gaussian Primordial Perturbations
• Primordial Non-Gaussianity and the NRAO VLA Sky Survey

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