Cosmological perturbation theory and quantum gravity

Romeo Brunetti, Klaus Fredenhagen, Thomas-Paul Hack, Nicola Pinamonti, Kasia Rejzner
May 09, 2016
It is shown how cosmological perturbation theory arises from a fully quantized perturbative theory of quantum gravity. Central for the derivation is a non-perturbative concept of gauge-invariant local observables by means of which perturbative invariant expressions of arbitrary order are generated. In particular, in the linearised theory, first order gauge-invariant observables familiar from cosmological perturbation theory are recovered. Explicit expressions of second order quantities are presented as well.
open access link doi:10.1007/JHEP08(2016)032
@article{Brunetti:2016hgw, author = "Brunetti, Romeo and Fredenhagen, Klaus and Hack, Thomas-Paul and Pinamonti, Nicola and Rejzner, Katarzyna", title = "{Cosmological perturbation theory and quantum gravity}", journal = "JHEP", volume = "08", year = "2016", pages = "032", doi = "10.1007/JHEP08(2016)032", eprint = "1605.02573", archivePrefix = "arXiv", primaryClass = "gr-qc", SLACcitation = "%%CITATION = ARXIV:1605.02573;%%" }