Hilltop Non-Gaussianity
arXiv:0810.1585 · doi:10.1088/1475-7516/2009/01/026
Abstract
We study non-Gaussianity induced by a pseudo Nambu-Goldstone boson with a cosine-type scalar potential. We focus on how the non-Gaussianity is affected when the pseudo Nambu-Goldstone boson rolls down from near the top of the scalar potential where the deviation from a quadratic potential is large. We find that the resultant non-Gaussianity is similar to that obtained in the quadratic potential, if the pseudo Nambu-Goldstone boson accounts for the curvature perturbation; the non-Gaussianity is enhanced, otherwise.
12 pages, 3 figures; References added; to appear in JCAP
References in corpus (10)
- Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
- Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect
- Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
- Primordial non-Gaussianity: large-scale structure signature in the perturbative bias model
- The curvature perturbation in a box
- Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
- Isocurvature, non-gaussianity and the curvaton model
- Non-Gaussianity from Symmetry
- Non-Gaussianity from Baryon Asymmetry
- N-vaton