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Anisotropic non-Gaussianity from vector field perturbations

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>15/07/2009
<mark>Journal</mark>Physical Review D
Issue number2
Pages (from-to)023509
Publication StatusPublished
<mark>Original language</mark>English


We suppose that a vector field perturbation causes part of the primordial curvature perturbation. The non-Gaussianity parameter f_NL 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.