M. Biagetti, A. Kehagias, E. Morgante, H. Perrier, A. Riotto
We analyze the class of models where a suitable coupling between the inflaton field and the vector field gives rise to scale-invariant vector perturbations. We exploit the fact that the de Sitter isometry group acts as conformal group on the three-dimensional Euclidean space for the super-Hubble fluctuations in order to characterize the correlators involving the inflaton and the vector fields.
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http://arxiv.org/abs/1304.7785
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