Abstract
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.
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ArXiv ePrint: 1605.02573
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Brunetti, R., Fredenhagen, K., Hack, TP. et al. Cosmological perturbation theory and quantum gravity. J. High Energ. Phys. 2016, 32 (2016). https://doi.org/10.1007/JHEP08(2016)032
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DOI: https://doi.org/10.1007/JHEP08(2016)032