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Cosmological perturbation theory and quantum gravity

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arxiv 1605.02573 v1 pith:MM5DNPLO submitted 2016-05-09 gr-qc hep-thmath-phmath.MP

Romeo Brunetti , Klaus Fredenhagen , Thomas-Paul Hack , Nicola Pinamonti , Katarzyna Rejzner This is my paper · ORCID
classification gr-qchep-thmath-phmath.MP
keywords theorycosmologicalorderperturbationexpressionsgauge-invariantgravityobservables
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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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Relational path integral, effective actions and quantum frame covariance in gravity

    hep-th 2026-07 conditional novelty 7.0 of 10

    The gravitational path integral is reformulated with dynamical reference frames, producing gauge-invariant correlators, frame-dependent vacua, and effective actions, with sharpness of events becoming frame-relative.

  2. Relational Observables in Group Field Theory

    gr-qc 2024-12 conditional novelty 7.0 of 10

    POVM-based conditioning on scalar-field quantum reference frames defines relational observables in group field theory that match prior number and volume results on coherent states.

  3. Quantum de Sitter Entropy and Sphere Partition Functions: A-Hypergeometric Approach to Higher Loop Corrections

    hep-th 2024-11 conditional novelty 6.0 of 10

    Scalar and vector Feynman integrals on the sphere are mapped to A-hypergeometric (GKZ) systems via embedding space propagators, enabling algorithmic higher-loop computations.

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