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Article . 1986
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https://doi.org/10.1103/physre...
Article . 1986 . Peer-reviewed
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Graviton propagator in de Sitter space

Authors: Allen, B.;

Graviton propagator in de Sitter space

Abstract

We consider the graviton propagator in a de Sitter background. The propagator depends upon the choice of a gauge-fixing term ${L}_{\mathrm{gauge}=1/2{F}^{2}}$, and we consider the ``\ensuremath{\epsilon} gauges'' with ${F}^{v}$=${\ensuremath{\nabla}}_{u}$(${h}^{\mathrm{uv}}$-\ensuremath{\epsilon}${g}^{\mathrm{uv}}$${h}^{\ensuremath{\sigma}}$${}_{\ensuremath{\sigma}}$). We show that the propagator is completely finite and has no infrared divergences provided that \ensuremath{\epsilon} is not given certain ``exceptional'' values. It is only for these ``exceptional'' values of \ensuremath{\epsilon} that the propagator has an infrared divergence. We then show that in these exceptional cases the divergences are gauge artifacts and are not physical: they make no contribution to any physical tree-level scattering amplitudes. Furthermore, we show that at one-loop order the zero modes which arise (only) if \ensuremath{\epsilon} is given one of the exceptional values are canceled by the Faddeev-Popov ghosts. There is thus no evidence that the de Sitter background is inconsistent when gravitational fluctuations are considered.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
54
Top 10%
Top 10%
Top 10%
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