Spinning guest fields during inflation: leftover signatures

Emanuela Dimastrogiovanni, Matteo Fasiello, A. Emir Gumrukcuoglu

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We consider the possibility of extra spinning particles during inflation, focussing on the spin-2 case. Our analysis relies on the well-known fully non-linear formulation of interacting spin-2 theories. We explore the parameter space of the corresponding inflationary Lagrangian and identify regions therein exhibiting signatures within reach of upcoming CMB probes. We provide a thorough study of the early and late-time dynamics ensuring that stability conditions are met throughout the cosmic evolution. We characterise in particular the gravitational wave spectrum and three-point function finding a local-type non-Gaussianity whose amplitude may be within the sensitivity range of both the LiteBIRD and CMB-S4 experiments.
Original languageEnglish
Article number047
Number of pages31
JournalJournal of Cosmology and Astroparticle Physics
Publication statusPublished - 24 Nov 2021


  • cosmological perturbation theory
  • inflation
  • modified gravity
  • non-gaussianity


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