462 citations
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Showing 2008 · astro-phShow all
3 papers · 2 filters
astro-ph2008★ 84 cited
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.…
astro-ph2008★ 70 cited
Gravitational waves from fragmentation of a primordial scalar condensate into Q-balls
Alexander Kusenko, Anupam Mazumdar
A generic consequence of supersymmetry is formation of a scalar condensate along the flat directions of the potential at the end of cosmological inflation. This condensate is usual…
astro-ph2008★ 71 cited
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…