Anisotropic non-Gaussianity from vector field perturbations

Karciauskas, Mindaugas and Dimopoulos, Konstantinos and Lyth, David H. (2009) Anisotropic non-Gaussianity from vector field perturbations. Physical Review D, 80 (2). 023509. ISSN 1550-7998

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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.