Scale dependence of local fNL
We consider possible scale-dependence of the non-linearity parameter fNL in local and quasi-local models of non-Gaussian primordial density perturbations. In the simplest model where the primordial perturbations are a quadratic local function of a single Gaussian field then fNL is scale-independent...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
26 February 2010
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| In: |
Journal of cosmology and astroparticle physics
Year: 2010, Heft: 2, Pages: 1-24 |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2010/02/034 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/1475-7516/2010/02/034 Verlag, lizenzpflichtig, Volltext: https://dx.doi.org/10.1088/1475-7516/2010/02/034 
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| Verfasserangaben: | Christian T. Byrnes, Sami Nurmi, Gianmassimo Tasinato and David Wands |
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| 520 | |a We consider possible scale-dependence of the non-linearity parameter fNL in local and quasi-local models of non-Gaussian primordial density perturbations. In the simplest model where the primordial perturbations are a quadratic local function of a single Gaussian field then fNL is scale-independent by construction. However scale-dependence can arise due to either a local function of more than one Gaussian field, or due to non-linear evolution of modes after horizon-exit during inflation. We show that the scale dependence of fNL is typically first order in slow-roll. For some models this may be observable with experiments such as Planck provided that fNL is close to the current observational bounds. | ||
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