Maximally symmetric vector propagator

@article{Tsamis2007MaximallySV,
  title={Maximally symmetric vector propagator},
  author={N. Tsamis and R. Woodard},
  journal={Journal of Mathematical Physics},
  year={2007},
  volume={48},
  pages={052306-052306}
}
We derive the propagator for a massive vector field on a de Sitter background of arbitrary dimension. This propagator is de Sitter invariant and possesses the proper flat space-time and massless limits. Moreover, the retarded Green’s function inferred from it produces the correct classical response to a test source. Our result is expressed in a tensor basis which is convenient for performing quantum-field-theory computations using dimensional regularization. 
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