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arXiv · 0909.2040

Scale Dependent Local Non-Gaussianity from Loops

Jason Kumar·Louis Leblond·Arvind Rajaraman
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Abstract

We analyze multi-field inflationary systems which yield strongly scale dependent non-Gaussianity with a shape that is very close to the local shape. As in usual multi-field models, the non-Gaussianity arises from the non-linear transfer of scalar field fluctuations to curvature perturbations. Here we consider models in which higher order terms (loops) dominate over the lowest order source of non-linearity. The magnitude of non-Gaussianity depends on an infrared cutoff which is determined by our observational probes measuring non-Gaussianity. In our models, the running is positive and large (n_{NG} ~ 0.2) on CMB scales. The magnitude of the bispectrum is maximally of order O(100), and grows on small scales. This can lead to interesting signals for large scale structure.

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Jason Kumar, Louis Leblond, Arvind Rajaraman. 2009-09-11. Scale Dependent Local Non-Gaussianity from Loops. https://doi.org/10.1088/1475-7516/2010/04/024

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