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arXiv · 1502.05138

Inflation with Massive Vector Fields

Junyu Liu·Yi Wang·Siyi Zhou
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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 $f_{NL}^\mathrm{equil} = \mathcal{O}(1)$, while in some regions of the parameter space large non-Gaussianity can arise.

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Junyu Liu, Yi Wang, Siyi Zhou. 2015-02-26. Inflation with Massive Vector Fields. https://doi.org/10.1088/1475-7516%2F2015%2F08%2F033

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