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Scale-dependent non-Gaussianity probes inflationary physics

We calculate the scale dependence of the bispectrum and trispectrum in (quasi) local models of non-Gaussian primordial density perturbations, and characterize this scale dependence in terms of new observable parameters. They can help to discriminate between models of inflation, since they are sensit...

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Bibliographic Details
Main Authors: Byrnes, Christian (Author) , Gerstenlauer, Mischa (Author) , Nurmi, Sami (Author) , Tasinato, Gianmassimo (Author) , Wands, D. (Author)
Format: Article (Journal)
Language:English
Published: 7 October 2010
In: Journal of cosmology and astroparticle physics
Year: 2010, Issue: 10, Pages: 1-28
ISSN:1475-7516
DOI:10.1088/1475-7516/2010/10/004
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/1475-7516/2010/10/004
Verlag, lizenzpflichtig, Volltext: https://dx.doi.org/10.1088/1475-7516/2010/10/004
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Author Notes:C.T. Byrnes, M. Gerstenlauer, S. Nurmi, G. Tasinato and D. Wands
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Summary:We calculate the scale dependence of the bispectrum and trispectrum in (quasi) local models of non-Gaussian primordial density perturbations, and characterize this scale dependence in terms of new observable parameters. They can help to discriminate between models of inflation, since they are sensitive to properties of the inflationary physics that are not probed by the standard observables. We find consistency relations between these parameters in certain classes of models. We apply our results to a scenario of modulated reheating, showing that the scale dependence of non-Gaussianity can be significant. We also discuss the scale dependence of the bispectrum and trispectrum, in cases where one varies the shape as well as the overall scale of the figure under consideration. We conclude providing a formulation of the curvature perturbation in real space, which generalises the standard local form by dropping the assumption that fNL and gNL are constants.
Item Description:Gesehen am 23.03.2023
Physical Description:Online Resource
ISSN:1475-7516
DOI:10.1088/1475-7516/2010/10/004

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