Anisotropic non-Gaussianity from vector field perturbations
arXiv:0812.0264 · doi:10.1103/PhysRevD.80.023509
Abstract
We suppose that a vector field perturbation causes part of the primordial curvature perturbation. The non-Gaussianity parameter fNL is then, in general, statistically anisotropic. We calculate its form and magnitude in the curvaton scenario and in the end-of-inflation scenario. We show that this anisotropy could easily be observable.
10 pages; v2: minor sign mistake corrected which affected Eqs. (18), (28) and (29)
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