Geodesics, gravitons and the gauge fixing problem
arXiv:hep-th/9708102 · doi:10.1103/PhysRevD.56.7779
Abstract
When graviton loops are taken into account, the background metric obtained as a solution to the one-loop corrected Einstein equations turns out to be gauge fixing dependent. Therefore it is of no physical relevance. Instead we consider a physical observable, namely the trajectory of a test particle in the presence of gravitons. We derive a quantum corrected geodesic equation that includes backreaction effects and is explicitly independent of any gauge fixing parameter.
21 pages, no figures, RevTeX
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