The inflationary prediction for primordial non-gaussianity

Details The inflationary prediction for primordial non-gaussianity The inflationary prediction for primordial non-gaussianity

2005-04-02

arxiv.org/abs/astro-ph/0504045v4

Phys.Rev.Lett.95:121302,2005

Astronomy and Astrophysics

Astrophysics

Revtex Latex file. 4 pages, no figures. v4: minor changes, typos corrected, references added and updated. Version published in

Scientific paper

10.1103/PhysRevLett.95.121302

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.

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