Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-04-16
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
17 pages, 8 figures, (v2 references added)
Scientific paper
We characterise the primordial perturbations produced due to both inflaton and curvaton fluctuations in models where the curvaton has a quadratic, cosine or hyperbolic potential, and the inflaton potential is characterised by the usual slow-roll parameters. Isocurvature curvaton field perturbations can produce significant non-Gaussianity in the primordial density field, in contrast with adiabatic inflaton field perturbations which produce negligible non-Gaussianity for canonical scalar fields. A non-self-interacting curvaton with quadratic potential produces a local-type non-Gaussianity that is well described by the non-linearity parameter fNL, which may be scale-dependent when the inflaton perturbations dominate the power spectrum. We show how observational bounds on non-linearity parameters and the tensor-scalar ratio can be used to constrain curvaton and inflaton parameters. We find a consistency relation between the bispectrum and trispectrum parameters in a mixed inflaton-curvaton model for a quadratic curvaton potential. Self-interaction terms in the curvaton potential can lead to both a large trispectrum parameter, gNL, and scale-dependence of the non-linearity parameters.
Fonseca José
Wands David
No associations
LandOfFree
Primordial non-Gaussianity from mixed inflaton-curvaton perturbations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Primordial non-Gaussianity from mixed inflaton-curvaton perturbations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Primordial non-Gaussianity from mixed inflaton-curvaton perturbations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-6326