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Inflation with massive vector fields

Liu, Junyu·Wang, Yi·Zhou, Siyi
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Abstract

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{sub NL}equil = O(1), while in some regions of the parameter space large non-Gaussianity can arise.

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS79 ASTRONOMY AND ASTROPHYSICSCOSMOLOGICAL INFLATIONDECOUPLINGINFLATIONARY UNIVERSEINFLATONSRENORMALIZATIONSCALARSSPACESYMMETRYVECTOR FIELDSVECTORS

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Liu, Junyu, Wang, Yi, Zhou, Siyi. 2015-08-01. Inflation with massive vector fields. https://doi.org/10.1088/1475-7516%2F2015%2F08%2F033

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