Possible signatures of inflationary particle content: spin-2 fields

Matteo Biagetti, Emanuela Dimastrogiovanni, Matteo Fasiello

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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 languageEnglish
Article number038
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
Publication statusPublished - 25 Oct 2017


  • astro-ph.CO
  • gr-qc
  • hep-th


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