Possible signatures of inflationary particle content: spin-2 fields

Matteo Biagetti; Emanuela Dimastrogiovanni; Matteo Fasiello

doi:10.1088/1475-7516/2017/10/038

Possible signatures of inflationary particle content: spin-2 fields

Matteo Biagetti, Emanuela Dimastrogiovanni, Matteo Fasiello

Institute of Cosmology & Gravitation

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Abstract

We study the imprints of a massive spin-2 field on inflationary observables, and in particular on the breaking of consistency relations. In this setup, the minimal inflationary field content interacts with the massive spin-2 field through dRGT interactions, thus guaranteeing the absence of Boulware-Deser ghostly degrees of freedom. The unitarity requirement on spinning particles, known as Higuchi bound, plays a crucial role for the size of the observable signal.

Original language	English
Article number	038
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2017
Issue number	10
DOIs	https://doi.org/10.1088/1475-7516/2017/10/038
Publication status	Published - 25 Oct 2017

Keywords

astro-ph.CO
gr-qc
hep-th

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10.1088/1475-7516/2017/10/038

Spin-2_23
This is an author-created, un-copyedited version of an article published in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1475-7516/2017/10/038.
Accepted author manuscript (Post-print), 437 KB

Cite this

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Possible signatures of inflationary particle content: spin-2 fields

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Keywords

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