Local non-Gaussianity from inflation

The non-Gaussian distribution of primordial perturbations has the potential to reveal the physical processes at work in the very early Universe. Local models provide a well-defined class of non-Gaussian distributions that arise naturally from the non-linear evolution of density perturbations on supe...

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Bibliographic Details
Published in:Classical and quantum gravity 2010-06, Vol.27 (12), p.124002
Main Author: Wands, David
Format: Article
Language:English
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Summary:The non-Gaussian distribution of primordial perturbations has the potential to reveal the physical processes at work in the very early Universe. Local models provide a well-defined class of non-Gaussian distributions that arise naturally from the non-linear evolution of density perturbations on super-Hubble scales starting from Gaussian field fluctuations. I describe the δN formalism used to calculate the primordial density perturbation on large scales and then review several models for the origin of local primordial non-Gaussianity, including the cuvaton, modulated reheating and ekpyrotic scenarios.
ISSN:0264-9381
1361-6382
DOI:10.1088/0264-9381/27/12/124002