Scale dependence of local fNL

• Verfasst von: Byrnes, Christian [VerfasserIn]
• Verfasst von: Gerstenlauer, Mischa [VerfasserIn]
• Verfasst von: Nurmi, Sami [VerfasserIn]
• Verfasst von: Tasinato, Gianmassimo [VerfasserIn]
• Verfasst von: Wands, D. [VerfasserIn]
• Titel: Scale dependence of local fNL
• Verf.angabe: Christian T. Byrnes, Sami Nurmi, Gianmassimo Tasinato and David Wands
• E-Jahr: 2010
• Jahr: 26 February 2010
• Umfang: 24 S.
• Fussnoten: Gesehen am 23.03.2023 ; Im Titel ist "NL" nach f tiefgestellt
• Titel Quelle: Enthalten in: Journal of cosmology and astroparticle physics
• Ort Quelle: London : IOP, 2003
• Jahr Quelle: 2010
• Band/Heft Quelle: (2010), 2, Artikel-ID 034, Seite 1-24
• ISSN Quelle: 1475-7516
• DOI: doi:10.1088/1475-7516/2010/02/034
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 183986866X

Abstract

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.