Separate universe framework in group field theory condensate cosmology

Florian Gerhardt, Daniele Oriti, and Edward Wilson-Ewing
Phys. Rev. D 98, 066011 – Published 19 September 2018

Abstract

We use the separate universe framework to study cosmological perturbations within the group field theory formalism for quantum gravity, based on multicondensate quantum states. Working with a group field theory action for gravity minimally coupled to four scalar fields that can act as a set of relational clock and rods, we argue that these multicondensate states correspond to cosmological space-times with small long-wavelength scalar perturbations. Equations of motion for the cosmological perturbations are derived, which in the classical limit agree with the standard results of general relativity and also include quantum gravity corrections that become important when the space-time curvature approaches the Planck scale.

  • Received 21 May 2018

DOI:https://doi.org/10.1103/PhysRevD.98.066011

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Florian Gerhardt1,*, Daniele Oriti1,2,†, and Edward Wilson-Ewing3,1,‡

  • 1Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mühlenberg 1, 14476 Golm, Germany
  • 2II Institute for Theoretical Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
  • 3Department of Mathematics and Statistics, University of New Brunswick, Fredericton, NB, Canada E3B 5A3

  • *florian.gerhardt@aei.mpg.de
  • daniele.oriti@aei.mpg.de
  • edward.wilson-ewing@unb.ca

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Issue

Vol. 98, Iss. 6 — 15 September 2018

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