Non-minimally coupled vector curvaton.

Dimopoulos, Konstantinos and Karciauskas, Mindaugas (2008) Non-minimally coupled vector curvaton. Journal of High Energy Physics, 2008 (07): 119.

Abstract

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.