Deducing Cosmological Observables from the S-matrix

S. P. Miao, T. Prokopec, R.P. Woodard

Research output: Contribution to journalArticleAcademicpeer-review


We study one loop quantum gravitational corrections to the long range force induced by the exchange of a massless scalar between two massive scalars. The various diagrams contributing to the flat space S-matrix are evaluated in a general covariant gauge and we show that dependence on the gauge parameters cancels at a point considerably {\it before} forming the full S-matrix, which is unobservable in cosmology. It is possible to interpret our computation as a solution to the effective field equations --- which could be done even in cosmology --- but taking account of quantum gravitational corrections from the source and from the observer.
Original languageEnglish
Article number104029
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number10
Publication statusPublished - 17 Nov 2017


  • gr-qc
  • astro-ph.CO


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