Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/12/016
Keywords
inflation; cosmological perturbation theory
Funding
- Science and Technology Facilities Council [ST/J001546/1]
- Ciencia 2008 research contract [PEst-OE/FIS/U I2751/2011, CERN/FP/116398/2010]
- STFC
- Science and Technology Facilities Council [ST/F007027/1, ST/J001546/1] Funding Source: researchfish
- STFC [ST/F007027/1, ST/J001546/1] Funding Source: UKRI
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We calculate the perturbed action, at second and third order, for a massive three-form field minimally coupled to gravity, and use it to explore the observational predictions of three-form inflation. One intriguing result is that the value of the spectral index is nearly independent of the three-form potential, being fixed solely by the number of e-folds of inflation, with n(s) = 0.97 for the canonical number of 60. Considering the bispectrum, we employ standard techniques to give explicit results for two models, one of which produces a large non-Gaussianity. Finally, we confirm our results by employing a duality relating the three-form theory to a non-canonical scalar field theory and explicitly re-computing results in this dual picture.
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