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  Cosmological perturbations from full quantum gravity

Gielen, S., & Oriti, D. (2018). Cosmological perturbations from full quantum gravity. Physical Review D, 98: 106019. doi:10.1103/PhysRevD.98.106019.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-6393-A Version Permalink: http://hdl.handle.net/21.11116/0000-0002-EC51-9
Genre: Journal Article

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 Creators:
Gielen, Steffen1, Author              
Oriti, Daniele1, Author              
Affiliations:
1Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_67201              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,High Energy Physics - Theory, hep-th
 Abstract: The early universe provides an opportunity for quantum gravity to connect to observation by explaining the large-scale structure of the Universe. In the group field theory (GFT) approach, a macroscopic universe is described as a GFT condensate; this idea has already been shown to reproduce a semiclassical large universe under generic conditions, and to replace the cosmological singularity by a quantum bounce. Here we extend the GFT formalism by introducing additional scalar degrees of freedom that can be used as a physical reference frame for space and time. This allows, for the first time, the extraction of correlation functions of inhomogeneities in GFT condensates: in a way conceptually similar to inflation, but within a quantum field theory of both geometry and matter, quantum fluctuations of a homogeneous background geometry become the seeds of cosmological inhomogeneities. We compute the power spectrum of scalar cosmological perturbations and find that it is naturally approximately scale invariant, with a naturally small amplitude. This confirms the potential of GFT condensate cosmology to provide a purely quantum gravitational foundation for the understanding of the early universe.

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 Dates: 2017-09-042018
 Publication Status: Published in print
 Pages: 6 pages, revtex, APS style
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1709.01095
URI: http://arxiv.org/abs/1709.01095
DOI: 10.1103/PhysRevD.98.106019
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 98 Sequence Number: 106019 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258