Inflationary trispectrum from graviton exchange

David Seery, Martin Snoager Sloth, Filippo Vernizzi

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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.
Original languageUndefined/Unknown
Article number0811.3934
JournalJournal of Cosmology and Astroparticle Physics
Publication statusPublished - 2009


  • astro-ph
  • gr-qc
  • hep-th

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