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Published in

IOP Publishing, Journal of Cosmology and Astroparticle Physics, 01(2009), p. 010-010, 2009

DOI: 10.1088/1475-7516/2009/01/010

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The Void Abundance with Non-Gaussian Primordial Perturbations

Journal article published in 2008 by Marc Kamionkowski, Licia Verde, Raul Jimenez ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We use a Press-Schechter-like calculation to study how the abundance of voids changes in models with non-Gaussian initial conditions. While a positive skewness increases the cluster abundance, a negative skewness does the same for the void abundance. We determine the dependence of the void abundance on the non-Gaussianity parameter fnl for the local-model bispectrum-which approximates the bispectrum in some multi-field inflation models-and for the equilateral bispectrum, which approximates the bispectrum in e.g. string-inspired DBI models of inflation. We show that the void abundance in large-scale-structure surveys currently being considered should probe values as small as fnl < 10 and fnl^eq < 30, over distance scales ~10 Mpc. Comment: Submitted to JCAP