Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2015/08/033
Keywords
inflation; physics of the early universe; cosmological perturbation theory
Funding
- Hong Kong University of Science and Technology
- Starting Grant of the European Research Council (ERC STG grant) [279617]
- Stephen Hawking Advanced Fellowship
- Hong Kong PhD Fellowship Scheme (HKPFS)
- Outstanding Student International Exchange Funding Scheme
- Yan Ji-Ci Class in the University of Science and Technology of China
- European Research Council (ERC) [279617] Funding Source: European Research Council (ERC)
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We investigate the coupling between the inflaton and massive vector fields. All renormalizable couplings with shift symmetry of the inflaton are considered. The massive vector can be decomposed into a scalar mode and a divergence-free vector mode. We show that the former naturally interacts with the inflaton and the latter decouples at tree level. The model in general predicts f(NL)(equil) = O(1), while in some regions of the parameter space large non-Gaussianity can arise.
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