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I discuss the possibility of using a massive vector field to generate thedensity perturbation in the Universe. I find that a scale-invariantsuperhorizon spectrum of vector field perturbations is possible to generateduring inflation. The associated curvature perturbation is imprinted onto theUniverse following the curvaton scenario. The mechanism does not generate along-range anisotropy because an oscillating massive vector field behaves as apressureless isotropic fluid.

Density Perturbations in the Universe from Massive Vector Fields