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arXiv:0711.4126 (astro-ph)
[Submitted on 26 Nov 2007 (v1), last revised 13 Mar 2008 (this version, v3)]

Title:Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures

Authors:Marilena LoVerde, Amber Miller, Sarah Shandera, Licia Verde
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Abstract: The detection of primordial non-Gaussianity could provide a powerful means to test various inflationary scenarios. Although scale-invariant non-Gaussianity (often described by the $f_{NL}$ formalism) is currently best constrained by the CMB, single-field models with changing sound speed can have strongly scale-dependent non-Gaussianity. Such models could evade the CMB constraints but still have important effects at scales responsible for the formation of cosmological objects such as clusters and galaxies. We compute the effect of scale-dependent primordial non-Gaussianity on cluster number counts as a function of redshift, using a simple ansatz to model scale-dependent features. We forecast constraints on these models achievable with forthcoming data sets. We also examine consequences for the galaxy bispectrum. Our results are relevant for the Dirac-Born-Infeld model of brane inflation, where the scale-dependence of the non-Gaussianity is directly related to the geometry of the extra dimensions.
Comments: 43 pages, 9 figures; references added, submitted to JCAP; typo corrected in Table 1, minor changes to the text
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0711.4126 [astro-ph]
  (or arXiv:0711.4126v3 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0711.4126
Journal reference: JCAP 0804:014,2008
Related DOI: https://doi.org/10.1088/1475-7516/2008/04/014

Submission history

From: Sarah Shandera [view email]
[v1] Mon, 26 Nov 2007 21:38:46 UTC (253 KB)
[v2] Mon, 17 Dec 2007 13:48:29 UTC (426 KB)
[v3] Thu, 13 Mar 2008 20:53:21 UTC (426 KB)
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