Inflationary trispectrum from graviton exchange

David Seery, Martin Snoager Sloth, Filippo Vernizzi

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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.
OriginalsprogUdefineret/Ukendt
Artikelnummer0811.3934
TidsskriftJournal of Cosmology and Astroparticle Physics
Vol/bind3
ISSN1475-7516
DOI
StatusUdgivet - 2009

Citer dette

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

I: Journal of Cosmology and Astroparticle Physics, Bind 3, 0811.3934 , 2009.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer 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

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

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JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

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