Adiabatic regularization of the graviton stress-energy tensor in de Sitter space-time

@article{Finelli2004AdiabaticRO,
  title={Adiabatic regularization of the graviton stress-energy tensor in de Sitter space-time},
  author={Fabio Finelli and G. Marozzi and Gian Paolo Vacca and Giovanni Venturi},
  journal={Physical Review D},
  year={2004},
  volume={71},
  pages={023522-023522}
}
We study the renormalized energy-momentum tensor of gravitons in a de Sitter space-time. After canonically quantizing only the physical degrees of freedom, we adopt the standard adiabatic subtraction used for massless minimally coupled scalar fields as a regularization procedure and find that the energy density of gravitons in the E(3) invariant vacuum is proportional to H{sup 4}, where H is the Hubble parameter, but with a positive sign. According to this result the scalar expansion rate… 

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