Scale-Dependent Non-Gaussianity as a Generalization of the Local Model

Details Scale-Dependent Non-Gaussianity as a Generalization of the Local Model Scale-Dependent Non-Gaussianity as a Generalization of the Local Model

2010-09-21

arxiv.org/abs/1009.4189v3

JCAP 01 (2011) 006

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted to JCAP. 22 pages, 4 figures

Scientific paper

10.1088/1475-7516/2011/01/006

We generalize the local model of primordial non-Gaussianity by promoting the parameter fNL to a general scale-dependent function fNL(k). We calculate the resulting bispectrum and the effect on the bias of dark matter halos, and thus the extent to which fNL(k) can be measured from the large-scale structure observations. By calculating the principal components of fNL(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.

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