Cosmological perturbation theory and quantum gravity

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JournalJournal of High Energy Physics
DateAccepted/In press - 22 Jul 2016
DatePublished (current) - 4 Aug 2016
Issue number32
Volume2016
Number of pages20
Original languageEnglish

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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© The Author(s) 2016.

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