1.9k citations · 16.3k across the 107 of their papers we have counts for
3 papers · 2 filters
Anisotropic non-Gaussianity from vector field perturbations
Mindaugas Karciauskas, Konstantinos Dimopoulos, David H. Lyth
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.…
Statistical anisotropy of the curvature perturbation from vector field perturbations
Konstantinos Dimopoulos, Mindaugas Karciauskas, David H. Lyth +1
The δN formula for the primordial curvature perturbation ζis extended to include vector as well as scalar fields. Formulas for the tree-level contributions to the spectrum and bisp…
Non-gaussianity of inflationary field perturbations from the field equation
David Seery, Karim A. Malik, David H. Lyth
We calculate the tree-level bispectrum of the inflaton field perturbation directly from the field equations, and construct the corresponding f_NL parameter. Our results agree with…