Anisotropic non-Gaussianity from vector field perturbations
classification
🌌 astro-ph
hep-ph
keywords
anisotropicfieldnon-gaussianityperturbationscenariovectoranisotropycalculate
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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.
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