pith. sign in

arxiv: astro-ph/0504045 · v4 · pith:QGHPANOTnew · submitted 2005-04-02 · 🌌 astro-ph · gr-qc· hep-ph· hep-th

The inflationary prediction for primordial non-gaussianity

David H. Lyth (1) , Yeinzon Rodriguez (1 , 2) ((1) Department of Physics Lancaster University , (2) Centro de Investigaciones Universidad Antonio Narino) This is my paper
classification 🌌 astro-ph gr-qchep-phhep-th
keywords formulagivennon-gaussianityperturbationprimordialzetabispectrumcalculation
0
0 comments X
read the original 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.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Cosmological long-wavelength solutions in non-adiabatic multi-fluid systems

    gr-qc 2025-12 unverdicted novelty 7.0

    Nonlinear long-wavelength solutions are constructed for cosmological perturbations in non-adiabatic multi-fluid systems, admitting adiabatic and entropy modes at leading order via ADM and gradient expansion.

  2. Isotropy, anisotropies and non-Gaussianity in the scalar-induced gravitational-wave background: diagrammatic approach for primordial non-Gaussianity up to arbitrary order

    astro-ph.CO 2025-05 unverdicted novelty 6.0

    Extends diagrammatic approach for scalar-induced gravitational waves to arbitrary-order local PNG, deriving semi-analytic spectra for energy density, anisotropies, bispectrum and trispectrum up to quartic terms.

  3. Orbital Inflation: inflating along an angular isometry of field space

    hep-th 2019-07 unverdicted novelty 6.0

    Orbital Inflation reconstructs two-field actions with an angular isometry yielding single-field-like predictions that violate consistency relations and allow f_NL from slow-roll suppressed to O(few) depending on entro...

  4. Curvaton-assisted hilltop inflation

    hep-ph 2025-12 unverdicted novelty 5.0

    Curvaton coupling relaxes initial tuning in hilltop inflation and revives the sub-Planckian quartic model while remaining consistent with cosmological observations.

  5. From Large Telescopes to the MUltiplexed Survey Telescope (MUST)

    astro-ph.IM 2026-05 unverdicted novelty 4.0

    MUST is a new 6.5 m telescope designed to deliver simultaneous optical spectra for over 20,000 targets across a 5 deg² field, enabling the largest 3D spectroscopic map of the Universe with redshifts for more than 100 ...