The inflationary prediction for primordial non-gaussianity
Astrophysics
2011-06-08 v4 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We extend the \delta N formalism so that it gives all of the stochastic properties of the primordial curvature perturbation \zeta if the initial field perturbations are gaussian. The calculation requires only the knowledge of some family of unperturbed universes. A formula is given for the normalisation \fnl of the bispectrum of \zeta, which is the main signal of non-gaussianity. Examples of the use of the formula are given, and its relation to cosmological perturbation theory is explained.
Keywords
Cite
@article{arxiv.astro-ph/0504045,
title = {The inflationary prediction for primordial non-gaussianity},
author = {David H. Lyth and Yeinzon Rodriguez},
journal= {arXiv preprint arXiv:astro-ph/0504045},
year = {2011}
}
Comments
Revtex Latex file. 4 pages, no figures. v4: minor changes, typos corrected, references added and updated. Version published in Physical Review Letters