Particle Production of Vector Fields: Scale Invariance is Attractive

@article{Dimopoulos2011ParticlePO,
  title={Particle Production of Vector Fields: Scale Invariance is Attractive},
  author={Konstantinos Dimopoulos and Jacques M. Wagstaff},
  journal={Physical Review D},
  year={2011},
  volume={83},
  pages={023523}
}
In a model of an Abelian vector boson with a Maxwell kinetic term and non-negative mass-squared it is demonstrated that, under fairly general conditions during inflation, a scale-invariant spectrum of perturbations for the components of a vector field, massive or not, whose kinetic function (and mass) is modulated by the inflaton field is an attractor solution. If the field is massless, or if it remains light until the end of inflation, this attractor solution also generates anisotropic stress… 
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