Research output: Contribution to journal › Article

Journal | Journal of High Energy Physics |
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Date | Accepted/In press - 22 Jul 2016 |

Date | Published (current) - 4 Aug 2016 |

Issue number | 32 |

Volume | 2016 |

Number of pages | 20 |

Original language | English |

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.

© The Author(s) 2016.

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