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Gravitons in de sitter space

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Field Theory, Quantum Gravity and Strings II

Part of the book series: Lecture Notes in Physics ((LNP,volume 280))

Abstract

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.

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Authors and Affiliations

  1. Department of Physics and Astronomy, Tufts University, 02155, Medford, MA, USA

    Bruce Allen

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  1. Bruce Allen
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H. J. de Vega N. Sánchez

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© 1987 Springer-Verlag

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Allen, B. (1987). Gravitons in de sitter space. In: de Vega, H.J., Sánchez, N. (eds) Field Theory, Quantum Gravity and Strings II. Lecture Notes in Physics, vol 280. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-17925-9_31

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  • DOI: https://doi.org/10.1007/3-540-17925-9_31

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  • Print ISBN: 978-3-540-17925-2

  • Online ISBN: 978-3-540-47934-5

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