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  Cosmology from Group Field Theory Formalism for Quantum Gravity

Gielen, S., Oriti, D., & Sindoni, L. (2013). Cosmology from Group Field Theory Formalism for Quantum Gravity. Physical Review Letters, 111: 031301. doi:10.1103/PhysRevLett.111.031301.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-CA9F-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-14A1-4
Genre: Journal Article

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 Creators:
Gielen, S.1, Author              
Oriti, D.1, Author              
Sindoni, L.1, Author              
Affiliations:
1Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_67201              

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 Abstract: We identify a class of condensate states in the group field theory (GFT) approach to quantum gravity that can be interpreted as macroscopic homogeneous spatial geometries. We then extract the dynamics of such condensate states directly from the fundamental quantum GFT dynamics, following the procedure used in ordinary quantum fluids. The effective dynamics is a non-linear and non-local extension of quantum cosmology. We also show that any GFT model with a kinetic term of Laplacian type gives rise, in a semi-classical (WKB) approximation and in the isotropic case, to a modified Friedmann equation. This is the first concrete, general procedure for extracting an effective cosmological dynamics directly from a fundamental theory of quantum geometry.

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 Dates: 20132013
 Publication Status: Published in print
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 Identifiers: DOI: 10.1103/PhysRevLett.111.031301
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 111 Sequence Number: 031301 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1