Anisotropic non-Gaussianity from vector field perturbations
Astrophysics
2009-09-02 v2 High Energy Physics - Phenomenology
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.
Keywords
Cite
@article{arxiv.0812.0264,
title = {Anisotropic non-Gaussianity from vector field perturbations},
author = {Mindaugas Karciauskas and Konstantinos Dimopoulos and David H. Lyth},
journal= {arXiv preprint arXiv:0812.0264},
year = {2009}
}
Comments
10 pages; v2: minor sign mistake corrected which affected Eqs. (18), (28) and (29)