Possible Signatures of Inflationary Particle Content: Spin-2 Fields
arXiv:1708.01587 · doi:10.1088/1475-7516/2017/10/038
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.
24 pages, 6 figures