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The void abundance with non-gaussian primordial perturbations

AuthorsKamionkowski, Marc; Verde, Licia ; Jiménez, Raúl
Physics of the early universe
Superclusters and voids
Power spectrum
Issue Date8-Jan-2009
PublisherInstitute of Physics Publishing
CitationJournal of Cosmology and Astroparticle Physics (JCAP) 01:010 (2009)
AbstractWe 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 single-field slow-roll inflation and in 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 f(nl) <~ 10 and f(nl)eq <~ 30, over distance scales ~ 10 Mpc.
Description9 pages, 3 figures.-- ArXiv pre-print available at: http://arxiv.org/abs/0809.0506
Publisher version (URL)http://dx.doi.org/10.1088/1475-7516/2009/01/010
Appears in Collections:(ICE) Artículos
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