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Related Experiment Video

Updated: May 9, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Cosmology from group field theory formalism for quantum gravity.

Steffen Gielen1, Daniele Oriti, Lorenzo Sindoni

  • 1Riemann Center for Geometry and Physics, Leibniz Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany. sgielen@perimeterinstitute.ca

Physical Review Letters
|August 6, 2013
PubMed
Summary

We found quantum gravity condensate states that act like homogeneous spatial geometries. Their dynamics yield a modified Friedmann equation, offering a new way to study cosmology from quantum geometry.

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Last Updated: May 9, 2026

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Area of Science:

  • Quantum gravity
  • Cosmology
  • Condensed matter physics

Background:

  • Group field theory (GFT) provides a fundamental framework for quantum gravity.
  • Understanding the emergence of classical spacetime from quantum geometry is a key challenge.

Purpose of the Study:

  • To identify and characterize macroscopic states within GFT.
  • To derive effective cosmological dynamics from fundamental quantum gravity.

Main Methods:

  • Identifying condensate states in GFT.
  • Extracting dynamics analogous to quantum fluids.
  • Applying semiclassical (WKB) approximation.

Main Results:

  • Identified condensate states interpretable as homogeneous spatial geometries.
  • Derived a nonlinear, nonlocal extension of quantum cosmology.
  • Showed a modified Friedmann equation arises from GFT with Laplacian kinetic terms.

Conclusions:

  • This work presents the first general procedure to extract effective cosmological dynamics from quantum geometry.
  • The findings bridge quantum gravity and observable cosmology.