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Non-minimally coupled vector curvaton.

Research output: Contribution to journalJournal article


Article number119
<mark>Journal publication date</mark>29/07/2008
<mark>Journal</mark>Journal of High Energy Physics
Issue number07
Number of pages10
<mark>Original language</mark>English


It is shown that a massive Abelian vector boson field can generate the curvature perturbation in the Universe, when coupled non-minimally to gravity, through an RA2 coupling. The vector boson acts as a curvaton field imposing the curvature perturbation after the end of inflation, without generating a large-scale anisotropy. The parameter space of the model is fully explored, obtaining the relevant bounds on the inflation scale and the decay constant of the vector curvaton.