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Title: | The void abundance with non-gaussian primordial perturbations |
Authors: | Kamionkowski, Marc; Verde, Licia ![]() |
Keywords: | Inflation Physics of the early universe Superclusters and voids Power spectrum |
Issue Date: | 8-Jan-2009 |
Publisher: | Institute of Physics Publishing |
Citation: | Journal of Cosmology and Astroparticle Physics (JCAP) 01:010 (2009) JCAP01(2009)010 |
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 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. |
Description: | 9 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 |
URI: | http://hdl.handle.net/10261/10791 |
DOI: | http://dx.doi.org/10.1088/1475-7516/2009/01/010 |
ISSN: | 1475-7516 |
Appears in Collections: | (ICE) Artículos |
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0809.0506v1.pdf | 166,71 kB | Adobe PDF | ![]() View/Open |
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