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Anisotropic non-Gaussianity from vector field perturbations.

Research output: Contribution to journalJournal article

Published

Journal publication date15/07/2009
JournalPhysical Review
Journal number2
Volume80
Pages023509
Original languageEnglish

Abstract

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.

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