Possible Signatures of Inflationary Particle Content: Spin-2 Fields
  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.
