### Resumé

Originalsprog | Udefineret/Ukendt |
---|---|

Artikelnummer | 0811.3934 |

Tidsskrift | Journal of Cosmology and Astroparticle Physics |

Vol/bind | 3 |

ISSN | 1475-7516 |

DOI | |

Status | Udgivet - 2009 |

### Citer dette

*Journal of Cosmology and Astroparticle Physics*,

*3*, [0811.3934 ]. https://doi.org/10.1088/1475-7516/2009/03/018

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*Journal of Cosmology and Astroparticle Physics*, bind 3, 0811.3934 . https://doi.org/10.1088/1475-7516/2009/03/018

**Inflationary trispectrum from graviton exchange.** / Seery, David; Sloth, Martin Snoager; Vernizzi, Filippo.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

TY - JOUR

T1 - Inflationary trispectrum from graviton exchange

AU - Seery, David

AU - Sloth, Martin Snoager

AU - Vernizzi, Filippo

PY - 2009

Y1 - 2009

N2 - We compute the connected four-point correlation function of the primordial curvature perturbation generated during inflation with standard kinetic terms, where the correlation is established via exchange of a graviton between two pairs of scalar fluctuations. Any such correlation yields a contribution to the scalar trispectrum of the order of the tensor to scalar ratio r. This contribution is numerically one order of magnitude larger than the one previously calculated ojavascript:void(0);n the basis of scalar perturbations interacting at a point and satisfies a simple relation in the limit where the momentum of the graviton which is exchanged becomes much smaller than the external momenta. We conclude that the total non-linearity parameter generated by single-field models of slow-roll inflation is at maximum tauNL ~ r.

AB - We compute the connected four-point correlation function of the primordial curvature perturbation generated during inflation with standard kinetic terms, where the correlation is established via exchange of a graviton between two pairs of scalar fluctuations. Any such correlation yields a contribution to the scalar trispectrum of the order of the tensor to scalar ratio r. This contribution is numerically one order of magnitude larger than the one previously calculated ojavascript:void(0);n the basis of scalar perturbations interacting at a point and satisfies a simple relation in the limit where the momentum of the graviton which is exchanged becomes much smaller than the external momenta. We conclude that the total non-linearity parameter generated by single-field models of slow-roll inflation is at maximum tauNL ~ r.

KW - astro-ph

KW - gr-qc

KW - hep-th

U2 - 10.1088/1475-7516/2009/03/018

DO - 10.1088/1475-7516/2009/03/018

M3 - Tidsskriftartikel

VL - 3

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

M1 - 0811.3934

ER -