Possible Signatures of Inflationary Particle Content: Spin-2 Fields

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

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Cited by in corpus (6)

• Detecting higher spin fields through statistical anisotropy in the CMB and galaxy power spectra
• Induced superhorizon tensor perturbations from anisotropic non-Gaussianity
• Small-scale Tests of Inflation
• Combining cosmological and local bounds on bimetric theory
• Bispectrum Islands
• Spinning Guest Fields during Inflation: Leftover Signatures