Scale-dependent non-Gaussianity as a generalization of the local model

Journal Article · Fri Dec 31 23:00:00 EST 2010 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/01/006· OSTI ID:22275257

Becker, Adam; Huterer, Dragan; Kadota, Kenji ^[1]

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1. Department of Physics and Michigan Center for Theoretical Physics, University of Michigan, 450 Church Street, Ann Arbor, MI 48109 (United States)

We generalize the local model of primordial non-Gaussianity by promoting the parameter f{sub NL} to a general scale-dependent function f{sub NL}(k). We calculate the resulting bispectrum and the effect on the bias of dark matter halos, and thus the extent to which f{sub NL}(k) can be measured from the large-scale structure observations. By calculating the principal components of f{sub NL}(k), we identify scales where this form of non-Gaussianity is best constrained and estimate the overlap with previously studied local and equilateral non-Gaussian models.

• OSTI ID: 22275257
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2011; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CALCULATION METHODS
COSMOLOGICAL MODELS
COSMOLOGY
FUNCTIONS
NONLUMINOUS MATTER
SCALE INVARIANCE