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Quantum fluctuations in the effective relational GFT cosmology

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arxiv 2010.09700 v2 pith:FYD75TJD submitted 2020-10-19 gr-qc hep-th

Luca Marchetti , Daniele Oriti This is my paper · ORCID
classification gr-qchep-th
keywords quantumfluctuationsdynamicseffectiveevolutionrelationalclockfundamental
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We analyze the size and evolution of quantum fluctuations of cosmologically relevant geometric observables, in the context of the effective relational cosmological dynamics of GFT models of quantum gravity. We consider the fluctuations of the matter clock observables, to test the validity of the relational evolution picture itself. Next, we compute quantum fluctuations of the universe volume and of other operators characterizing its evolution (number operator for the fundamental GFT quanta, effective Hamiltonian and scalar field momentum). In particular, we focus on the late (clock) time regime, where the dynamics is compatible with a flat FRW universe, and on the very early phase near the quantum bounce produced by the fundamental quantum gravity dynamics.

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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 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.

  2. Emergent scalar field dynamics in a cosmological spacetime from GFT quantum gravity

    gr-qc 2026-08 conditional novelty 6.0 of 10

    From GFT condensate cosmology, the authors derive an effective scalar field equation and a modified dispersion relation with dispersive and dissipative quantum gravity corrections.

  3. An Exactly Soluble Group Field Theory

    gr-qc 2024-12 conditional novelty 6.0 of 10

    A non-interacting group field theory exactly reproduces the Husain-Kuchar model's spinfoam amplitudes and Fock space, bridging canonical and covariant quantization approaches.

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