Gravitons in de sitter space

  • Bruce Allen
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 280)


What has been shown in this talk is that the graviton propagator in de Sitter space is OK. If one makes a bad choice of gauge (-fixing term) then the propagator is infra-red divergent. However this is not a problem. You can either make a better choice of gauge (of which there are an infinite number), for which the propagator is completely, finite, or else you can go right ahead and use the infra-red divergent one. We demonstrated that it doesn't matter. Gauge-invariance is the over-riding principle, and it ensures that even if the propagator has an infra-red divergence, the physical scattering amplitudes are finite.

A more detailed discussion of these points can also be found in an earlier published paper |20|. The complete closed form for the graviton propagator with ε = ½ has also been found |22|. Finally a closed form in the de Sitter -non-invariant gauge (1.1) has been recently obtained |26|. This form applies to any spatially-flat Robertson-Walker model.


Gauge Transformation Graviton Propagator Spacelike Separation Gauge Artifact Background Energy Density 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Bruce Allen
    • 1
  1. 1.Department of Physics and AstronomyTufts UniversityMedfordUSA

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